Laser Cladding In-Situ Ti(C,N) Particles Reinforced Ni-Based Composite Coatings Modified with CeO2 Nanoparticles
Abstract
:1. Introduction
2. Experimental Details
2.1. Materials Used
2.2. Laser Cladding Setup and Process
2.3. Characterization Test Methods of the Coatings
3. Results and Discussion
3.1. Phase Constituents of the Coatings
3.2. Microstructure Analysis of the Coatings
3.2.1. Microstructure of the Coatings Fabricated by Pre-Placed Powders without CeO2 Additive
3.2.2. Influence of CeO2 Nanoparticles on the Microstructure of Coatings
3.3. Micro-Hardness and Wear Resistance of the Coatings
4. Conclusions
- In-situ synthesized Ti(C,N) reinforced Ni-based composite coatings are fabricated on Ti6Al4V substrates by laser cladding using Ni60 alloy, C, TiN, and nano-CeO2 powders as the pre-placed materials. The composite coatings metallurgically bonded with the substrates are mainly composed of γ-Ni, Ni3Ti, Ni4B3, Ti(C,N), TiC, TiN, Cr2B, and Cr7C3 phases.
- The formation mechanisms of Ti(C,N) particles as reinforced phases in the coating are that the large Ti(C,N) particles form around TiN particles, and the small Ti(C,N) particles form by independent nucleation.
- The microstructures of the coatings fabricated by pre-placed powders with different contents of CeO2 additive are obviously improved, which is mainly related to the heterogeneous nucleation of CeO2 nanoparticles.
Author Contributions
Funding
Conflicts of Interest
References
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Cr | Fe | W | Si | B | C | Ni |
---|---|---|---|---|---|---|
15.5 | 15 | 3 | 4 | 3.5 | 0.65 | Bal. |
Sample Group No. | Powder Ingredients (wt %) | |||
---|---|---|---|---|
Ni60 | C | TiN | CeO2 | |
Sample 0 | 88 | 2 | 10 | 0 |
Sample 1 | 87 | 2 | 10 | 1 |
Sample 2 | 86 | 2 | 10 | 2 |
Sample 3 | 85 | 2 | 10 | 3 |
Area | Elements (at %) | ||||||
---|---|---|---|---|---|---|---|
Ti | N | C | Cr | B | Ni | Fe | |
A | 3.02 | - | 12.24 | 8.13 | - | 65.71 | 10.90 |
B | 3.99 | - | 15.45 | 7.29 | 8.66 | 62.12 | 2.49 |
C1 | 37.16 | 50.47 | 12.37 | - | - | - | - |
C2 | 33.82 | 16.14 | 42.95 | 1.48 | - | 5.61 | - |
D1 | 1.04 | - | 22.54 | 23.18 | 51.13 | 1.85 | 0.26 |
D2 | 1.84 | - | 37.36 | 16.58 | 23.55 | 17.47 | 3.20 |
Region | Elements (at %) | ||||||
---|---|---|---|---|---|---|---|
Ti | N | C | Cr | B | Ni | Fe | |
A | 37.16 | 50.47 | 12.37 | - | - | - | - |
B | 1.84 | - | 37.36 | 16.58 | 23.55 | 17.47 | 3.20 |
C | 29.69 | 52.82 | 14.76 | 0.72 | - | 1.76 | 0.25 |
D | 43.81 | 8.58 | 42.59 | 3.91 | - | 1.11 | - |
E | 2.34 | - | 31.33 | 21.61 | 42.54 | 1.22 | 0.96 |
F | 34.79 | 40.84 | 21.59 | 0.96 | - | 1.82 | - |
G | 1.51 | - | 24.78 | 31.90 | 33.69 | 5.03 | 2.48 |
H | 40.48 | 26.34 | 33.18 | - | - | - | - |
I | 2.70 | - | 25.26 | 17.26 | 42.96 | 8.04 | 3.78 |
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Chen, T.; Wu, F.; Wang, H.; Liu, D. Laser Cladding In-Situ Ti(C,N) Particles Reinforced Ni-Based Composite Coatings Modified with CeO2 Nanoparticles. Metals 2018, 8, 601. https://doi.org/10.3390/met8080601
Chen T, Wu F, Wang H, Liu D. Laser Cladding In-Situ Ti(C,N) Particles Reinforced Ni-Based Composite Coatings Modified with CeO2 Nanoparticles. Metals. 2018; 8(8):601. https://doi.org/10.3390/met8080601
Chicago/Turabian StyleChen, Tao, Fan Wu, Haojun Wang, and Defu Liu. 2018. "Laser Cladding In-Situ Ti(C,N) Particles Reinforced Ni-Based Composite Coatings Modified with CeO2 Nanoparticles" Metals 8, no. 8: 601. https://doi.org/10.3390/met8080601