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Article

Enhancement of Wear Resistance on H13 Tool and Die Steels by Trace Nanoparticles

by
Shu-Qing Kou
,
Jun-Nan Dai
,
Wen-Xin Wang
*,
Chun-Kai Zhang
,
Si-Yu Wang
,
Tai-Yu Li
and
Fang Chang
*
Key Laboratory of Automobile Materials, Ministry of Education and Department of Materials Science and Engineering, Jilin University, Changchun 130025, China
*
Authors to whom correspondence should be addressed.
Metals 2022, 12(2), 348; https://doi.org/10.3390/met12020348
Submission received: 31 December 2021 / Revised: 10 February 2022 / Accepted: 14 February 2022 / Published: 16 February 2022
(This article belongs to the Special Issue Advances in Preparation Methods and Numerical Simulation of Composites: Formation and Properties)
Browse Figures
Versions Notes

Abstract

:
In order to improve the impact toughness and wear resistance of the tool and die steels, this study innovatively prepared strengthened H13 steels with different contents of single-phase TiC and dual-phase TiC + TiB2 through in situ nanoparticle/Al master alloys at room temperature. The microstructure evolution and mechanical properties as well as wear resistance were investigated. Results indicate that the H13 steel with 0.02 wt.% dual-phase TiC + TiB2 nanoparticles has a more uniform and finer microstructure, and the mechanical properties and wear resistance are significantly improved. The yield strength, maximum tensile strength, breaking strain, uniform elongation, product of strength plasticity, and unnotched and U-notched impact toughness of H13 steel with 0.02 wt.% dual-phase TiC + TiB2 are higher than that of H13 steel. In addition, the volume wear rate, maximum scratch depth and width reach 7.1 × 10−11 m3/m, 6050 nm and 90 μm, respectively, which are reduced by 44.5%, 30.1% and 45.5% compared with that of H13 steel. Refining the microstructure and improving impact toughness and wear resistance of H13 tool steel through trace nanoparticles can provide important inspiration for industrial applications.

1. Introduction

Tool and die steels should not only ensure wear resistance, but also need good impact toughness, which can guarantee that they have a long service life under wear conditions [1,2,3,4,5]. For example, the shield machine rolling tools generally made of tool and die steels with high Cr content [6,7,8,9,10,11] have good mechanical properties represented by impact toughness, as well as high wear resistance [12,13,14]. The main reason is that when the rolling tool is used for rock rolling, it bears the abrasive wear condition under high stress, and a large amount of heat is generated by instantaneous friction, which makes the tool surface temperature rise rapidly [15,16,17]. After rotating, the tool surface immediately is cooled down by water spray. Therefore, the tool not only withstands the wear condition [18,19,20], but also bears the cold and hot fatigue. However, for some tool and die steels with specific compositions, wear resistance and impact toughness are contradictory. Under the condition of high wear resistance, the impact toughness of steels is generally poor [21,22,23,24]. Therefore, it is necessary to balance the impact toughness and wear resistance in order to improve the service life of the tools [25,26,27]. Generally speaking, there are many methods to improve the contradictory mechanical properties of steel, such as ultra-pure purification, heat treatment, large forging ratio and so on [21,28,29,30,31]. However, on a technical level, the tool and die steel for cutting tools has reached a certain limit. Therefore, developing a new and efficient method that can improve the impact toughness and wear resistance of steels has a high practical significance and industrial application value [32,33,34].
Recent studies have found that nanoparticles can not only nucleate and refine the solidification microstructures of an alloy [35,36,37,38], but also increase the strength and toughness of alloys [39,40,41,42,43]. Nanoparticles have a strong effect of microstructure refinement [44,45,46]. Nanoparticles not only can refine the microstructure and control the growth size and morphology of grains [47,48,49,50,51], but also greatly improve the comprehensive mechanical properties of the alloys, especially, high-temperature strength, high-temperature creep, high-temperature wear resistance, impact toughness and fatigue [52,53,54,55,56,57]. Compared with traditional strengthening and toughening technology, the effective control technology by nanoparticles has significant advantages such as not changing the existing casting process and equipment, green and environmental protection [58,59,60]. At present, there are few studies on the microstructure evolution and anti-wear behaviors of tool steels manipulated by trace nanoparticles. It is necessary to study the anti-wear behavior and its mechanism of steels manipulated by trace nanoparticles.
However, it is difficult to add nanoparticles to liquid steel [35,47,61,62] due to the large specific gravity difference between liquid steel and nanoparticles [63,64,65,66,67]. Nanoparticles easily adsorb contamination and thus affect the strengthening effect [68,69]. In addition, the surface energy of nanoparticles is relatively high, so they are easy to agglomerate and difficult to disperse [70,71,72]. Non-dispersed and surface-polluted nanoparticles not only fail to strengthen, but also deteriorate the properties of the steel. In order to successfully prepare the nanoparticle reinforced steels, this work focuses on adding nanoparticles to the liquid steel through the in situ nanoparticle/Al master alloys. The effects of different types and contents of nanoparticles on the microstructures and their corresponding wear resistance were studied. Enhancement and mechanism of wear resistance of H13 tool and die steels manipulated by trace nanoparticles were analyzed. This method can significantly refine the microstructures and improve the wear resistance of H13 tooling steels through trace nanoparticles, which provides a new method for improving the wear resistance of high-performance alloys and has important influence for industrial applications.

2. Materials and Methods

2.1. Preparation of H13 Tool and Die Steels Manipulated by Trace Nanoparticles

The in situ nanoparticle/Al master alloys are prepared by self-propagating combustion in Al-Ti-C/B4C systems. The specific preparation process is reported in previous research [73,74,75]. The three powders of Al, Ti, and B were mechanically ground in a ball mill, and then cold-pressed into a cylindrical shape. Then, the specimens were hot-pressed and vacuum-sintered to initiate a combustion synthesis reaction, and cooled to room temperature to obtain a master alloy. The chemical composition of H13 tool and die steels manipulated by trace nanoparticles is shown in Table 1. The preparation process of H13 tool and die steels manipulated by trace nanoparticles is shown in Figure 1. The steel is melted in an intermediate frequency induction furnace and the molten steel is discharged at 1873 K. At the same time, the in situ nanoparticle/Al master alloys enter the ladle with the liquid steel, and then aluminum matrix melts in liquid steel and nanoparticles are gradually released. The mass of molten steel is 1000 kg and the master alloy is 333 g or 666 g, and the corresponding content of the nanoparticles is 0.01 wt.% or 0.02 wt.%, that is, 100 g or 200 g. The mass of Al is 233 g or 466 g, and the mass ratio of nanoparticles to Al is 3:7. The pre dispersed in situ nanoparticles in the aluminum are wrapped by the melt and master alloy, so they cannot contact the air and their surfaces are also not contaminated. When the master alloys enter the ladle with the liquid steel, it is added to the liquid steel with the liquid flow. At the same time, the aluminum matrix melts in liquid steel and gradually releases nanoparticles, thus making nanoparticles evenly distributed in liquid steel.
This process solves the problem of agglomeration of nanoparticles, thus making nanoparticles evenly distributed in liquid steel. The molten steel in the ladle is purified by argon blowing for 5 min. Then, the liquid steel is cast into a billet through a mold. After that, the billet is subjected to electroslag remelting, homogenization, forging, grain refinement and tempering. Finally, H13 tool and die steels manipulated by trace nanoparticles are quenched at 1313 K and tempered three times in the furnace at 803 K, 813 K, and 823 K, respectively. The microstructures of tempered martensite are obtained.

2.2. Characterization and Performance Testing

The microstructure was observed by optical microscope (OM, AXIO-Imager A2 Microscope, Oberkochen, Germany), scanning electron microscope (SEM, Tescan vega3 XM, Brno, Czech Republic) with electron backscatter diffraction (EBSD, Oxford NordlysMax EBSD, Oxford, UK) and transmission electron microscope (TEM, JEM-2100F, Tokyo, Japan); corrosion treatment was carried out with 10% nitric acid alcohol solution before observation. Impact tests were conducted using an ITM impact testing machine (JBDW-500CY, Jinan, China) to test the impact toughness of the H13 tool and die steels. Unnotched impact specimens with dimensions of 10 × 7 × 55 mm3 and U-notch impact specimens with dimensions of 10 × 10 × 55 mm3 were prepared for the impact test. Tensile tests were performed at a strain rate of 10−4 s−1 on a servo-hydraulic materials testing system (MTS, MTS 810, Eden Prairie, MN, USA).
As shown in Figure 2, the abrasive wear experiment was conducted on the wheel wear tester (MLH-30, Zhangjiakou, China). The samples with the dimension of 35 mm × 5 mm × 5 mm cuboid are used. The size of wear surface is 35 mm × 5 mm. The abrasive particle sizes of sandpaper are 28 μm and 14 μm, and the loads are 15 N and 25 N. After one pass of each portion of the sample on the sandpaper, it will be replaced with a new sandpaper. The wear distance of every specimen is 150 m. The samples before and after wear test were weighed using a balance with an accuracy of 0.0001 g and the volume wear rate is calculated as:
W = Δ m ρ L
where W is the volume wear rate (m3/m), Δm is the difference between the mass of the sample before and after wear (g), ρ is the density of the sample (kg/m3), which was measured by the electronic densitometer (WLD-3005, Shenzhen, China), L is the total stroke of wear (m).
The optical profiler (NT9100, VEECO, Sacramento, CA, USA) was used to characterize the structural features of the specimen after wear under different conditions. Each experiment was performed at least three times, and the surface roughness value is the average value of the three tests.

3. Results and Discussion

3.1. Microstructure of H13 Steels Manipulated by Trace Nanoparticles

Figure 3 shows the microstructure of H13 steels without and with different types and contents of nanoparticles under optical microscope. As shown in Figure 3a, tempered lath martensite, carbide and a small amount of residual austenite are observed after quenching and tempering heat treatment. Figure 3b shows the metallographic microstructure of H13 with 0.02 wt.% TiC nanoparticles. It can be seen that the distribution of martensite becomes more uniform and smaller because of the addition of TiC nanoparticles. The distribution of black lath area is more uniform, indicating that lath martensite is refined. At the same time, the size of regular white granular retained austenite decreases, and no carbide segregation at grain boundary is found. As shown in Figure 3c,d, the addition of dual phase nanoparticles has the same effect for the metallographic microstructures of H13 as single-phase nanoparticles. The martensite becomes finer and smaller, residual austenite becomes smaller, and also no carbide segregation at the crystal boundary is found. This trend of carbide segregation becomes more obvious with the further increase of the content of dual phase nanoparticles.
Figure 4 shows EBSD images of H13 steels without and with different nanoparticles. It can be seen from Figure 4a that there are a large number of coarse and straight grains in the H13 steel without nanoparticles; the grain size is mainly between 10 μm and 20 μm with certain directionality and uneven distribution. The grains of H13 steel with 0.02 wt.% single-phase TiC nanoparticles (Figure 4b) are obviously refined and most of the grains do not exceed 10 μm in size. In addition, the shape is relatively full and the directionality basically disappears. The grains of H13 steel with 0.01 wt.% (Figure 4c) and 0.02 wt.% (Figure 4d) dual-phase TiC + TiB2 nanoparticles are more refined, most of the grains do not exceed 5 μm in size, and the distribution is relatively uniform. These results indicate that trace nanoparticles have a refinement on the microstructures of H13 steels, but the refinement effect of the dual-phase nanoparticles is more obvious. Figure 5 shows TEM images of H13 steel and H13 steel manipulated by 0.02 wt.% TiC + TiB2. It can be seen that the addition of nanoparticles refines the martensitic lath in H13 steel and the carbides in martensite become smaller in size and greater in quantity. Moreover, the nanoparticles effectively hindered the growth of lath martensite and made the precipitation of carbides more uniform. The dense microstructures with fine and uniform particles can provide the necessary conditions for H13 steels to have better mechanical properties.

3.2. Mechanical Properties of H13 Steels Manipulated by Trace Nanoparticles

Table 2 gives the tensile and impact toughness values of different types and contents of nanoparticle-reinforced H13 steel at room temperature. The hardness, yield strength, maximum tensile strength, fracture strain, uniform elongation and product of strength plasticity of H13 steel are 46.9 HRC, 1023 MPa, 1325 MPa, 14.8%, 5.3% and 16,348 MPa %, respectively. For the H13 steel with 0.02 wt.% single-phase TiC nanoparticles and the H13 steel with 0.01 wt.% dual-phase TiC + TiB2 nanoparticles, these properties were slightly improved. However, the hardness, yield strength, maximum tensile strength, fracture strain, uniform elongation and product of strength plasticity of H13 steel with 0.02 wt.% dual-phase TiC + TiB2 nanoparticles increased by 3.8%,11.6%, 7.6%, 14.2%, 64.2% and 26.4%, respectively, compared to H13. Therefore, the hardness, yield strength, maximum tensile strength and product of strength plasticity of dual-phase TiC + TiB2 nanoparticle-reinforced H13 steel can be strengthened with the increase of the content of nanoparticles and the fracture strain as well as uniform elongation, which are also significantly improved compared to unreinforced H13 steel. Furthermore, the H13 steel manipulated by dual-phase nanoparticles enhances the uniform elongation of H13 steel, which promotes H13 steel to have more uniform and stable plastic deformation.
In addition, the non-notched and U-notched impact toughness of H13 steel without nanoparticles reached 332.9 J/cm2 and 30.94 J/cm2, respectively. After adding 0.02 wt.% single-phase TiC, 0.01 wt.% dual-phase TiC + TiB2 and 0.02 wt.% dual-phase TiC + TiB2 nanoparticles to H13 steel, the non-notched and U-notched impact toughness were 406.8 J/cm2 and 33.93 J/cm2, 419.6 J/cm2 and 38.46 J/cm2, 449.3 J/cm2 and 41.39 J/cm2, respectively, which increased by 22.2% and 9.6%, 26.0% and 24.3%, 35.0% and 33.8%, respectively, compared with H13 steel without nanoparticles. The H13 steel with 0.02 wt.% dual-phase nanoparticles has larger impact toughness and a more uniform and finer microstructure, thus it has a better performance during plastic deformation. Furthermore, the cracks caused by the reduction in grain size consume more energy during propagation.
Adding single-phase TiC and dual-phase TiC + TiB2 nanoparticles can improve the performance of H13 steel to a certain extent. Especially, the addition of 0.02 wt.% dual-phase TiC + TiB2 nanoparticles enhances the yield strength and tensile strength of H13 steel the most, simultaneously with the highest impact toughness and the best wear resistance. Adding nanoparticles to H13 steel makes the grain size of the refined and the distribution of grains more uniform and dense. While the H13 steel is subjected to external force, the better coordination between finer grains can disperse the stress and effectively prevent stress concentration, thereby improving the performance of the steel. By comparison, the dual-phase TiC + TiB2 nanoparticles have a more obvious strengthening effect on steel. H13 steel manipulated by dual-phase TiC + TiB2 nanoparticles has finer lath martensite and denser microstructure than that of single-phase TiC nanoparticles, so that it has good mechanical properties and impact toughness. The added nanoparticles can be used as nucleation sites to promote nucleation and inhibit the growth of martensite, which makes the microstructure of H13 steel finer and the grain boundaries increase, thus playing a role in strengthening. Similar studies have been reported in the literature [5,25,42,64,65]. The existence of uniformly dispersed carbides can effectively hinder the movement of dislocations and the grain boundaries of the refined H13 steel increase, which is not conducive to the expansion of cracks. These synergistic effects improve the mechanical properties of the H13 steel with different types and contents of nanoparticles. Overall, the main strengthening mechanisms can be attributed to grain refinement strengthening and second-phase strengthening.

3.3. Abrasive Wear Behavior of H13 Steel Manipulated by Trace Nanoparticles

Figure 6 and Table 3 show the volumetric wear rate of H13 steels without and with different types and contents of nanoparticles under sandpaper with abrasive particle size of 28 μm and the loads of 15 N and 25 N at room temperature. It can be seen that the volumetric wear rate of the different materials increases with the increase in load. When the load is 15 N, the volumetric wear rate of H13 steel with 0.02 wt.% TiC, 0.01 wt.% TiC + TiB2 and 0.02 wt.% TiC + TiB2 is reduced by 48.3%, 35.6% and 52.9%, respectively, compared with H13 steel without nanoparticles. Further, when the load is 25 N, the volumetric wear rate of H13 steel with 0.02 wt.% TiC, 0.01 wt.% TiC + TiB2 and 0.02 wt.% TiC + TiB2 are respectively reduced by 38.3%, 28.9% and 44.5% compared to H13 steel without nanoparticles. Compared to single-phase nanoparticles, dual-phase nanoparticles have a better effect on improving wear resistance.
Figure 7 shows the SEM micrographs of the abrasive worn surface of H13 steel without and with different types and contents of nanoparticles under the loads of 15 N and 25 N. It can be seen from Figure 7a that many deeper and wider furrows on the surface wear of H13 steel without nanoparticles are observed. However, the width of the furrow on the surface wear of H13 steel with 0.02 wt.% single-phase TiC nanoparticles is significantly reduced (Figure 7b). Compared with H13 steel with 0.02 wt.% single-phase TiC nanoparticles, the surfaces of H13 steel with 0.01 wt.% dual-phase TiC + TiB2 nanoparticles have more furrows and a greater degree of surface wear but this is much less severe than that of the H13 steel matrix (Figure 7c). Surprisingly, the H13 steel with 0.02 wt.% dual-phase TiC + TiB2 nanoparticles has the mildest surface wear and the smallest depth and width of furrow (Figure 7d). While under a load of 25 N, as shown in Figure 7e–h, the wear characteristic of different types and contents of the steel is similar to that under the load of 15 N. However, it is obvious that the degree of wear of different materials under this load are more severe than that under the load of 15 N. The increase in load increases the interaction strength between the steel and the sandpaper, which leads to an increase in the degree of wear. In general, trace nanoparticle-reinforced H13 steel can effectively reduce the depth and width of the furrows on the surface of the steel and enhance the wear resistance of the steel. The enhancement effect of 0.02 wt.% single-phase TiC nanoparticles on the wear resistance of H13 steel is greater than that of 0.01 wt.% dual-phase TiC + TiB2 nanoparticles. Furthermore, the H13 steel with 0.02 wt.% dual-phase TiC + TiB2 nanoparticles has the best wear resistance, indicating that the enhancement effect of dual-phase nanoparticles on the wear resistance of steel is much greater than that of single-phase nanoparticles at the same content. The reason is that the hardness, strength and toughness of bidirectional nanoparticle-strengthened steel are much higher than that of H13 steel, which guarantee its higher wear resistance.
Figure 8 and Table 4 show the white light interference results of H13 steel without and with different contents of nanoparticles under the loads of 15 N and 25 N. It can be seen from Figure 8(a1) that the worn surface of H13 steel without nanoparticles at 15 N is covered with deep furrows with large height differences. However, the worn surfaces of H13 steel with 0.02 wt.% single-phase TiC and 0.01 wt.% dual-phase TiC + TiB2 nanoparticles are relatively flat and the depth of furrow is relatively uniform (Figure 8(b1,c1)). The wear resistance of H13 steel with 0.02 wt.% dual-phase TiC + TiB2 nanoparticles is the best accompanied by the flattest surface, the smallest furrow depth and the flattest surface (Figure 8(d1)). Figure 8(a2,a3) show that the depth of furrows on the surface of H13 steel without nanoparticles is large and the degree of abrasive wear is obvious. The depth of the worn surface is in the range of −3720 nm–3260 nm, and the maximum depth difference and the width of the wear scar on the worn surface can reach 6980 nm and 165 μm. Compared with H13 steel without nanoparticles, the surface abrasion of H13 steel with 0.02 wt.% single-phase TiC nanoparticles is reduced. The worn surface depth of the steel ranges from −2800 nm to 2900 nm, the maximum difference of worn surface depth is 5700 nm. Furthermore, the maximum width of the wear scar is 175 μm and the overall width of the wear scar is uniform except for the larger ones (Figure 8(b2,b3)). The depth of the worn surface of H13 steel with 0.01 wt.% dual-phase TiC + TiB2 nanoparticles ranges from −3250 nm to 2500 nm, the maximum difference of the depth can reach 5750 nm and the maximum width of the wear scar is 135 μm. Compared to H13 steel with 0.02 wt.% single-phase TiC nanoparticles, the depth of the furrow of H13 steel with 0.01 wt.% dual-phase TiC + TiB2 nanoparticles increases slightly, but the maximum width of wear scar is smaller (Figure 8(c2,c3)). The depth of the surface of H13 steel with 0.02 wt.% dual-phase TiC + TiB2 nanoparticles ranges from −3400 nm to 2200 nm, the maximum difference of the depth of the worn surface is 5600 nm, and the depth of wear scar is reduced by 19.8%. The maximum width of the wear scar is 125 μm, and the depth is reduced by 24.2% (Figure 8(d2,d3)). The surface of H13 steel with 0.02 wt.% dual-phase TiC + TiB2 nanoparticles has the best abrasive wear performance.
It can be seen from the Figure 8(e1–h1) that increasing load can increase the depth of furrow and the degree of surface wear of the different materials. The deep furrows in Figure 8(e1–e3) show that the surface of H13 steel without nanoparticles at the load of 25 N is worn seriously. The range of the worn surface depth is −4750–3900 nm, the maximum difference of the depth is 8650 nm, and the wear scar reaches 165 μm. However, the ranges of worn surface depth of H13 steel with 0.02 wt.% single-phase TiC, 0.01 wt.% dual-phase TiC + TiB2, and 0.02 wt.% dual-phase TiC + TiB2 nanoparticles are −4200–2500 nm, −4250–3750 nm and −3800–2250 nm and the maximum worn surface depth difference is 6700 nm, 8000 nm and 6050 nm, respectively (Figure 8(e1–h2)). The maximum width of the wear scars is 115 μm, 150 μm and 90 μm, respectively, which is reduced by 30.3%, 9.1% and 45.5%, respectively (Figure 8(e3–h3)). In summary, the degree of worn surface of the steel is reduced and the depth of the surface furrow is reduced due to the finer lath martensite of H13 steel manipulated by nanoparticles. Under the loads of 15 N and 25 N, the anti-abrasive wear order of different steels is H13 steel with 0.02 wt.% TiC + TiB2 > H13 steel with 0.02 wt.%TiC > H13 steel with 0.01 wt.%TiC + TiB2 > H13 steel. The H13 steel reinforced by dual-phase nanoparticles has stronger resistance to abrasive wear than that of the H13 steel reinforced by single-phase nanoparticles. The addition of nanoparticles refines the microstructure of H13 steel, especially the H13 steel with 0.02 wt.% dual-phase TiC + TiB2, which has finer martensite and greater hardness. Therefore, it can effectively resist the intrusion of abrasive particles and reduce the generation of grooves. A similar phenomenon was also reported by Coronado et al. [76].
Figure 9 and Table 5 show the volumetric wear rate of H13 steels without and with different types and contents of nanoparticles under the load of 25 N using the sandpaper with different abrasive particle size. Rough sandpaper can increase the volume wear rate of various materials. Compared with H13 steel without nanoparticles, the volumetric wear rate of H13 steel with 0.02 wt.% TiC, 0.01 wt.% TiC + TiB2 and 0.02 wt.% TiC + TiB2 is reduced by 38.3%, 28.9% and 44.5%, respectively. Using the sandpaper with the abrasive particle size of 14 μm, the volumetric wear rate of H13 steel with 0.02 wt.% TiC, 0.01 wt.% and 0.02 wt.% TiC + TiB2 is, respectively, reduced by 37.3%, 32.8% and 47.8% compared to the H13 steel. Therefore, the H13 steel with 0.02 wt.%TiC + TiB2 shows the best wear resistance at different sandpaper size, and the anti-abrasive wear order of different steels is H13 steel with 0.02 wt.% TiC + TiB2 > H13 steel with 0.02 wt.% TiC > H13 steel with 0.01 wt.% TiC + TiB2 > H13 steel.
Figure 10a–h shows the abrasive worn surface morphologies of H13 steels without and with different contents and types of nanoparticles at the abrasive particle size of 28 μm and 14 μm. Compared with the abrasive particle size of 14 μm, the surface of the steel at the abrasive particle size of 28 μm has a higher degree of wear and the deeper furrow (Figure 10a–d). Figure 10e shows that the surface of H13 steel without nanoparticles has a more severe degree of wear, and a deeper and wider furrow. However, the degree of the surface wear of H13 steel with 0.02 wt.% TiC is reduced, and the depth and width of the furrow are also reduced (Figure 10f). Figure 10g shows that the degree of the surface wear of H13 steel with 0.01 wt.% TiC + TiB2 is slighter than that of the H13 steel but is more severe than that of the H13 steel with 0.02 wt.% TiC. The H13 steel with 0.01 wt.% TiC + TiB2 shows a poor wear resistance compared with the H13 steel with 0.02 wt.% TiC. In short, the H13 steel with 0.02 wt.% dual-phase TiC + TiB2 has the best wear resistance.
Figure 10(e1–h3) and Table 6 show the white light interference results of nanoparticles of different types and contents reinforced H13 steel at the load of 25 N after abrasive wear of sandpaper with abrasive particle size of 14 μm. The corresponding results of abrasive wear of sandpaper with abrasive particle size of 28 μm are given in Figure 8(e1–h3). Compared with the surface with abrasive particle size of 28 μm, the number of furrows on the surface with particle sizes of 14 μm is decreased and the degree of abrasive wear is reduced. Figure 10(e1–e3) shows that the surface wear of H13 steel without nanoparticles is serious, accompanied by a very deep furrow, the depth of worn surface ranges from −3250 nm to 2500 nm, and the maximum difference of depth is 5750 nm. Notably, the wear scar on the worn surface reaches 150 μm. As the addition of nanoparticles, the surfaces of different H13 steels become relatively flat, the depth of the furrow is reduced, and the wear resistance is enhanced. The depth of the worn surface of H13 steel with 0.02 wt.% TiC ranges from −2300 nm to 1800 nm, the maximum difference of depth and the maximum width of the wear scar are 4100 nm and 150 μm, respectively (Figure 10(f1–f3)). Furthermore, the depth of the surface furrow of H13 steel with 0.01 wt.% TiC + TiB2 is slightly higher than that of H13 steel with 0.02 wt.% TiC. However, compared with H13 steel without nanoparticles, the wear resistance is significantly improved. The depth of worn surface ranges from −2600 nm to 2200 nm, the maximum difference of depth and the maximum width of the wear scar is 4800 nm and 115 μm, respectively. Same as above, the H13 steel with 0.02 wt.% dual-phase TiC + TiB2 has the flattest surface and the best wear resistance. The surface depth ranges from −1950 nm to 2000 nm, and the maximum difference of depth of worn surface is 3950 nm. Compared to the H13 steel, the depth of the surface of the steel manipulated by 0.02 wt.% dual-phase TiC + TiB2 is reduced by 31.3%. Furthermore, the maximum width of the wear scar is 75 μm, reduced by 50%, and the depth and width of the furrow are significantly reduced. Therefore, it has the best abrasive wear resistance at the room temperature. Smaller sized abrasive particles produce more finer and more uniform furrow marks on all steel surfaces. With the increase of the abrasive size, the mass loss and wear rate of the composite increase, and the depth and width of the grooves increase, which is also confirmed by Tressia et al. [77]. Due to the irregularity of abrasive particles, larger size abrasive particles are more likely to damage and crush the surface of H13 steel and cause secondary wear. At present, the relevant literature [78] has reported the effect of abrasive particle size on wear, but there is no unified understanding that can effectively explain its effect.
In the abrasive wear process, a furrow is formed when the matrix is plowed out under the action of friction. The addition of nanoparticles, especially dual-phase nanoparticles, can make the steel matrix resist the indentation of abrasive particles and reduce the indentation depth of abrasive particles, thus leading to the formation of denser microstructure of steel. Compared with single-phase nanoparticles, dual-phase nanoparticles have better resistance to abrasive particle invasion. The denser microstructure of H13 steel manipulated by dual-phase nanoparticles can effectively prevent abrasive particles from being pressed into the steel, thereby protecting the matrix from excessive plowing and effectively reducing the generation of grooves.

4. Conclusions

In this work, strengthened H13 steel was prepared by adding different contents of single-phase TiC and dual-phase TiC + TiB2 through the master alloy method. The tensile strength, impact toughness and abrasive wear behavior of different strengthened steels under different loads and sandpaper abrasive particle sizes at room temperature were studied. The following conclusions can be drawn:
The microstructure of H13 steel after quenching and tempering heat treatment mainly consists of tempered martensite. The microstructure of H13 steel reinforced with single-phase TiC and dual-phase TiC + TiB2 nanoparticles is more uniform than that without nanoparticles. The dual-phase nanoparticles have a greater refining effect, especially when the content is 0.02 wt.%. Further, the addition of nanoparticles can effectively enhance the mechanical properties of H13 steel, including tensile performance and impact toughness. The strengthening effect of dual-phase TiC + TiB2 nanoparticles is more obvious than that of single-phase TiC. Particularly, the yield strength, maximum tensile strength, fracture strain, uniform elongation, product of strength plasticity, non-notched and U-notched impact toughness of H13 steel with 0.02 wt.% dual-phase TiC + TiB2 nanoparticles are 1142 MPa, 1426 MPa, 16.9%, 8.7%, 20662 MPa·%, 449.3 J/cm2 and 41.39 J/cm2, respectively, which increased by 11.6%, 7.6%, 14.2%, 64.2%, 26.4%, 35.0% and 33.8%, respectively, compared to H13. In addition, trace nanoparticle-reinforced H13 steel can effectively reduce the depth and width of grooves on the surface and improve the wear resistance. The volume wear rate and the depth and width of the maximum scratch of H13 steel with 0.02 wt.% dual-phase TiC + TiB2 nanoparticles are 7.1 × 10−11 m3/m, 6050 nm and 90 μm, respectively, which are reduced by 44.5%, 30.1% and 45.5%, respectively, compared with H13 steel under the load of 25 N and a sandpaper abrasive particle size of 28 μm. Dual-phase nanoparticles, especially 0.02 wt.% dual-phase TiC + TiB2, can significantly improve the wear resistance of H13 steel compared to single-phase nanoparticles, which can be attributed to the denser microstructure of H13 steel manipulated by dual-phase nanoparticles, weakening the effect of ploughing wear.

Author Contributions

Conceptualization, S.-Q.K., J.-N.D. and F.C.; Data curation, J.-N.D., T.-Y.L. and F.C.; Formal analysis, S.-Q.K., J.-N.D., W.-X.W., C.-K.Z., S.-Y.W. and F.C.; Investigation, S.-Q.K., J.-N.D., W.-X.W., T.-Y.L. and F.C.; Supervision, J.-N.D. and F.C.; Writing—review and editing, S.-Q.K., J.-N.D. and F.C. All authors have read and agreed to the published version of the manuscript.

Funding

This work is supported by the Industrial Technology Research and Development of Jilin Development and Reform Commission, China (No.2021C038-3) and the Graduate Innovation Fund of Jilin University, China (No. 202110183X176).

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Data sharing is not applicable.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. The preparation process of H13 tool and die steels manipulated by trace nanoparticles: (a) melt, (b) addition and release of nanoparticles, (c) uniform distribution of nanoparticles, (d) casting, (e) steel ingot.
Figure 1. The preparation process of H13 tool and die steels manipulated by trace nanoparticles: (a) melt, (b) addition and release of nanoparticles, (c) uniform distribution of nanoparticles, (d) casting, (e) steel ingot.
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Figure 2. Schematic diagram of abrasive wear process: (a) machine, (b) sample stage, (c) wear direction and sample size.
Figure 2. Schematic diagram of abrasive wear process: (a) machine, (b) sample stage, (c) wear direction and sample size.
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Figure 3. Heat-treated microstructure of H13 steels without and with different types and contents of nanoparticles under optical microscope: (a) H13; (b) 0.02 wt.% TiC; (c) 0.01 wt.% TiC+ TiB2; (d) 0.02 wt.% TiC + TiB2.
Figure 3. Heat-treated microstructure of H13 steels without and with different types and contents of nanoparticles under optical microscope: (a) H13; (b) 0.02 wt.% TiC; (c) 0.01 wt.% TiC+ TiB2; (d) 0.02 wt.% TiC + TiB2.
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Figure 4. EBSD images of H13 steels without and with different types and contents of nanoparticles: (a) H13, (b) 0.02 wt.% TiC, (c) 0.01 wt.% TiC + TiB2 and (d) 0.02 wt.% TiC + TiB2.
Figure 4. EBSD images of H13 steels without and with different types and contents of nanoparticles: (a) H13, (b) 0.02 wt.% TiC, (c) 0.01 wt.% TiC + TiB2 and (d) 0.02 wt.% TiC + TiB2.
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Figure 5. TEM morphologies of (a) H13 steel and (b) H13 steel manipulated by 0.02 wt.% TiC + TiB2.
Figure 5. TEM morphologies of (a) H13 steel and (b) H13 steel manipulated by 0.02 wt.% TiC + TiB2.
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Figure 6. Volumetric wear rate of H13 steel without and with different types and contents of nanoparticles under sandpaper with abrasive particle size of 28 μm and different loads.
Figure 6. Volumetric wear rate of H13 steel without and with different types and contents of nanoparticles under sandpaper with abrasive particle size of 28 μm and different loads.
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Figure 7. SEM of worn surface of H13 steels without and with nanoparticles under sandpaper with abrasive particle size of 28 μm and different loads: (a–d) 15N and (e–h) 25 N.
Figure 7. SEM of worn surface of H13 steels without and with nanoparticles under sandpaper with abrasive particle size of 28 μm and different loads: (a–d) 15N and (e–h) 25 N.
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Figure 8. White light interference of worn surface of H13 steels without and with nanoparticles under sandpaper with abrasive particle size of 28 μm and different loads: (a1–d3) 15 N and (e1–h3) 25 N.
Figure 8. White light interference of worn surface of H13 steels without and with nanoparticles under sandpaper with abrasive particle size of 28 μm and different loads: (a1–d3) 15 N and (e1–h3) 25 N.
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Figure 9. Volumetric wear rate of H13 steels without and with nanoparticles at different sandpaper abrasive particle sizes.
Figure 9. Volumetric wear rate of H13 steels without and with nanoparticles at different sandpaper abrasive particle sizes.
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Figure 10. SEM of worn surface of H13 steels without and with nanoparticles under the load of 25 N and different sandpaper abrasive particle sizes: (a–d) 28 μm and (e–h) 14 μm, and white light interference of worn surface of H13 steel reinforced by nanoparticles under sandpaper abrasive particle sizes of 14 μm: (e1–e3) H13, (f1–f3) 0.02 wt.% TiC, (g1–g3) 0.01 wt.% TiC + TiB2 and (h1–h3) 0.02 wt.% TiC + TiB2.
Figure 10. SEM of worn surface of H13 steels without and with nanoparticles under the load of 25 N and different sandpaper abrasive particle sizes: (a–d) 28 μm and (e–h) 14 μm, and white light interference of worn surface of H13 steel reinforced by nanoparticles under sandpaper abrasive particle sizes of 14 μm: (e1–e3) H13, (f1–f3) 0.02 wt.% TiC, (g1–g3) 0.01 wt.% TiC + TiB2 and (h1–h3) 0.02 wt.% TiC + TiB2.
Metals 12 00348 g010
Table
Table 1. The chemical composition of H13 tool and die steels.
Table 1. The chemical composition of H13 tool and die steels.
SampleCCrMoVSiMnPSFe
H130.415.51.751.201.200.50<0.03<0.03Bal.
Table
Table 2. Tensile properties and impact toughness of H13 steels without and with different contents of nanoparticles at room temperature.
Table 2. Tensile properties and impact toughness of H13 steels without and with different contents of nanoparticles at room temperature.
SampleHardness (HRC)σ0.2 (MPa)σUTS (MPa)εf (%)UE (%)Product of Strength Plasticity (MPa·%)Non-NotchedImpact Toughness (J/cm2)U-Notched Impact Toughness (J/cm2)
H1346.9 ± 0.11023 ± 61325 ± 714.8 ± 0.25.3 ± 0.216,348 ± 340332.9 ± 2.430.94 ± 0.6
H13 + 0.02 wt.% TiC47.5 ± 0.21131 ± 81415 ± 516.8 ± 0.45.6 ± 0.319,835 ± 325406.8 ± 3.133.93 ± 1.3
H13 + 0.01 wt.% TiC + TiB248.2 ± 0.11035 ± 61343 ± 617.2 ± 0.28.9 ± 0.319,989 ± 296419.6 ± 3.338.46 ± 0.8
H13 + 0.02 wt.% TiC + TiB248.7 ± 0.11142 ± 121426 ± 1516.9 ± 1.28.7 ± 0.520,662 ± 492449.3 ± 2.941.39 ± 1.0
Table
Table 3. Volumetric wear rate of H13 steel without and with different types and contents of nanoparticles under sandpaper with abrasive particle size of 28 μm and different loads.
Table 3. Volumetric wear rate of H13 steel without and with different types and contents of nanoparticles under sandpaper with abrasive particle size of 28 μm and different loads.
SampleWeight Loss (g)Volumetric Wear Rate (10−11 m3/m)
15N25N15N25N
H130.1024 ± 0.00230.1507 ± 0.00378.7 ± 0.212.8 ± 0.3
H13 + 0.02 wt.% TiC0.0530 ± 0.00350.0930 ± 0.00114.5 ± 0.37.9 ± 0.1
H13 + 0.01 wt.% TiC + TiB20.0659 ± 0.00190.1072 ± 0.00215.6 ± 0.29.1 ± 0.2
H13 + 0.02 wt.% TiC + TiB20.0483 ± 0.00160.0836 ± 0.00184.1 ± 0.27.1 ± 0.2
Table
Table 4. White light interference results for different steels without and with nanoparticles under the loads of 15 N and 25 N.
Table 4. White light interference results for different steels without and with nanoparticles under the loads of 15 N and 25 N.
SampleThe Depth of the Worn Surface (nm)The Maximum Depth Difference (nm)The Width of the Wear Scar (μm)
15 N25 N15 N25 N15 N25 N
H13−3720–3260−4750–390069808650165165
H13 + 0.02 wt.% TiC−2800–2900−4200–−250057006700175115
H13 + 0.01 wt.%TiC + TiB2−3250–2500−4250–375057508000135150
H13 + 0.02 wt.%TiC + TiB2−3400–2200−3800–22505600605012590
Table
Table 5. Volumetric wear rate of H13 steels without and with nanoparticles at different sandpaper abrasive particle sizes.
Table 5. Volumetric wear rate of H13 steels without and with nanoparticles at different sandpaper abrasive particle sizes.
SampleWeight Loss (g)Volumetric Wear Rate (10−11m3/m)
28 μm14 μm28 μm14 μm
H130.1507 ± 0.00370.0789 ± 0.002912.8 ± 0.36.7 ± 0.3
H13 + 0.02 wt.% TiC0.0930 ± 0.00110.0495 ± 0.00317.9 ± 0.14.2 ± 0.3
H13 + 0.01 wt.% TiC + TiB20.1072 ± 0.00210.0530 ± 0.00359.1 ± 0.24.5 ± 0.2
H13 + 0.02 wt.% TiC + TiB20.0836 ± 0.00180.0412 ± 0.00207.1 ± 0.23.5 ± 0.2
Table
Table 6. White light interference results for H13 steels without and with nanoparticles under sandpaper abrasive particle sizes of 14 μm and the load of 25 N.
Table 6. White light interference results for H13 steels without and with nanoparticles under sandpaper abrasive particle sizes of 14 μm and the load of 25 N.
SampleThe Depth of the Worn Surface (nm)The Maximum Depth Difference (nm)The Width of the Wear Scar (μm)
H13−3250–25005750150
H13 + 0.02 wt.% TiC−2300–18004100150
H13 + 0.01 wt.%TiC + TiB2−2600–22004800115
H13 + 0.02 wt.%TiC + TiB2−1950–2000395075
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Kou, S.-Q.; Dai, J.-N.; Wang, W.-X.; Zhang, C.-K.; Wang, S.-Y.; Li, T.-Y.; Chang, F. Enhancement of Wear Resistance on H13 Tool and Die Steels by Trace Nanoparticles. Metals 2022, 12, 348. https://doi.org/10.3390/met12020348

AMA Style

Kou S-Q, Dai J-N, Wang W-X, Zhang C-K, Wang S-Y, Li T-Y, Chang F. Enhancement of Wear Resistance on H13 Tool and Die Steels by Trace Nanoparticles. Metals. 2022; 12(2):348. https://doi.org/10.3390/met12020348

Chicago/Turabian Style

Kou, Shu-Qing, Jun-Nan Dai, Wen-Xin Wang, Chun-Kai Zhang, Si-Yu Wang, Tai-Yu Li, and Fang Chang. 2022. "Enhancement of Wear Resistance on H13 Tool and Die Steels by Trace Nanoparticles" Metals 12, no. 2: 348. https://doi.org/10.3390/met12020348

APA Style

Kou, S. -Q., Dai, J. -N., Wang, W. -X., Zhang, C. -K., Wang, S. -Y., Li, T. -Y., & Chang, F. (2022). Enhancement of Wear Resistance on H13 Tool and Die Steels by Trace Nanoparticles. Metals, 12(2), 348. https://doi.org/10.3390/met12020348

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