Effect of High-power Laser Quenching on Microstructure and Wear Resistance of 35CrMo Steel Surface Layer
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摘要: 采用高功率激光器对调质态35CrMo钢进行表面淬火处理,研究了不同激光功率(1.6,2.4,3.2,4.0 kW)下表层的显微组织、硬度及耐磨性能。结果表明:当激光功率为1.6,2.4 kW时,35CrMo钢表层组织中存在未溶铁素体,硬度比基体低,与GCr15钢对磨后的磨损质量变化率与基体几乎相同,耐磨性较差;当激光功率为3.2,4.0 kW时,表层组织全部为回火马氏体,平均硬度可以达到640 HV,比常规水冷淬火后的硬度提高约20%;当激光功率为3.2 kW时,磨损质量变化率最小,表面未发现明显的磨损痕迹,与基体相比耐磨性得到显著提高,而当激光功率提高到4.0 kW时较高的马氏体自回火程度导致硬度与耐磨性比激光功率为3.2 kW时略有降低。Abstract: Surface quenching treatment of 35CrMo steel was carried out by high power laser. The microstructure, hardness and wear resistance of surface layer under different laser power(1.6,2.4,3.2,4.0 kW) were studied. The results show that when the laser power was 1.6 and 2.4 kW, the undissolved ferrite existed on the surface layer of 35CrMo steel, and the surface layer hardness was lower than that of the substrate; the wear mass rate of the steel was almost the same as that of the substrate after grinding with GCr15 steel, indicating the steel had bad wear resistance. When the laser power was 3.2, 4.0 kW, the surface layer microstructure was all tempered martensite, and the average surface layer hardness reached 640 HV, which was about 20% higher than that after conventional water quenching. The wear mass rate under laser power of 3.2 kW was the lowest, no obvious wear trace could be found on the surface, and the wear resistance was significantly improved compared with the substrate. When the laser power was up to 4.0 kW, the higher self-tempering degree of martensite resulted in a slight decrease in hardness and wear resistance compared with the laser power of 3.2 kW.
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Keywords:
- 35CrMo steel /
- high-power laser quenching /
- microstructure /
- hardness /
- wear resistance
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