Microstructural Characteristics and Properties of Laser-Welded Diamond Saw Blade with 30CrMo Steel
Abstract
:1. Introduction
2. Materials and Methods
2.1. Preparation of Experimental Sample
2.2. Material Characterization
3. Results and Discussions
3.1. Effect of Laser Power on Weld Formation and Tooth-Pulling Strength
3.2. Effect of Welding Speed on Weld Formation and Tooth-Pulling Strength
3.3. Microstructural Analysis
3.4. Phase Composition Analysis
3.5. EBSD Analysis
3.6. Microhardness Distribution
3.7. Analysis of Fracture Morphology
4. Conclusions
- (1)
- The laser-welded diamond saw blades with a tooth-pulling strength reaching as high as 819 MPa are obtained at the optimized welding parameters with a laser power of 1600 W and a welding speed of 1400 mm/min. However, during the process of laser welding, it is essential to carefully adjust the heat input. Too low a heat input may result in incomplete penetration defects, while excessively higher heat input could lead to issues such as spattering, splashing, porosity, and cracks.
- (2)
- The cross-sectional morphology of laser-welded diamond saw blades can be divided into the transition layer of the base material, the welding zone (including Cu-rich and Fe-rich regions), the matrix heat-affected zones, and the base material zones. In the welding zone, due to multiple segregations of Fe and Cu under supercooling conditions, spherical or dendritic iron segregation near the copper matrix and spherical copper segregation near the 30CrMo matrix are formed. Simultaneously, large-sized grains with dimensions reaching 148.56 µm are present. The 30CrMo matrix heat-affected zone exhibits coarse needle-like martensitic microstructures from quenching. The 30CrMo matrix is composed of quenching and tempering martensite.
- (3)
- The microhardness of the welded joint sharply increases at the boundary between the fusion zone and the heat-affected zone of the base metal, reaching a maximum of 550 HV. Through the tooth-pulling strength test, it was observed that fractures typically occur at the interface between the laser-welded fusion zone and the heat-affected zone of the base metal. This phenomenon is primarily attributed to the rapid cooling during laser welding, leading to the formation of high-strength but brittle quenched needle-like martensite. The requirements for the shape of the diamond saw blade result in a thicker cutting edge compared to the base metal, causing stress concentration at the interface and further increasing the risk of fracture.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Element | Cu | Ni | Fe | Co | Cr |
---|---|---|---|---|---|
wt% | 58.6 | 17.2 | 11.8 | 7.3 | 5.1 |
Element | C | Si | Mn | P | Cr | Mo | Fe |
---|---|---|---|---|---|---|---|
wt% | 0.321 | 0.352 | 0.487 | 0.018 | 1.082 | 0.245 | Bal. |
No. | 1# | 2# | 3# | 4# | 5# | 6# | 7# | 8# |
---|---|---|---|---|---|---|---|---|
Welding power (w) | 1600 | 1600 | 1600 | 1600 | 1400 | 1500 | 1600 | 1700 |
Welding speed (mm/min) | 1200 | 1400 | 1600 | 1800 | 1400 | 1400 | 1400 | 1400 |
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Xu, Q.; Shu, C.; Liu, Y.; Kou, S.; Cao, R.; Cao, X.; Wu, J. Microstructural Characteristics and Properties of Laser-Welded Diamond Saw Blade with 30CrMo Steel. Materials 2024, 17, 1840. https://doi.org/10.3390/ma17081840
Xu Q, Shu C, Liu Y, Kou S, Cao R, Cao X, Wu J. Microstructural Characteristics and Properties of Laser-Welded Diamond Saw Blade with 30CrMo Steel. Materials. 2024; 17(8):1840. https://doi.org/10.3390/ma17081840
Chicago/Turabian StyleXu, Qiang, Chen Shu, Yibo Liu, Shengzhong Kou, Rui Cao, Xiaodie Cao, and Jiajun Wu. 2024. "Microstructural Characteristics and Properties of Laser-Welded Diamond Saw Blade with 30CrMo Steel" Materials 17, no. 8: 1840. https://doi.org/10.3390/ma17081840