目的 提高 45^#钢零件的表面硬度和润滑减摩性能。 方法 在 45^#钢试样表面进行激光淬火,研究激光功率和扫描速度对淬火表面淬硬层深度和宽度的影响,分析淬硬层不同区域的显微硬度和微观组织。 利用二极管泵浦 Nd:YAG 激光加工机在 45^#钢光滑试样表面加工出具有一定分布规律的微凹坑织构,采用热压法向其中填入由 MoS₂、聚酰亚胺和石墨组成的复合固体润滑剂,并与未处理的光滑试样进行摩擦学性能对比。 结果 将激光织构与淬火技术有效融合,可以使 45^#钢表面硬度提高至 835 HV,摩擦系数减小约 50% 。 结论 激光织构淬火减摩抗磨复合处理技术能够提高 45^#钢零件的表面硬度,减小摩擦系数,具有很好的工程应用前景。

Objective To improve the hardness and antifriction properties on 45^# steel surface. Methods Laser quenching was performed on the 45^# steel surface. The effects on the hardened depth and width of the quenched surface by laser powers and scanning speeds were studied. The micro-hardness and micro-structure were analyzed on the different parts of the hardened layer. Uniform-distributive micro-dimples were conducted on the smooth surface of 45^# steel specimens by diode-pumped Nd:YAG laser machine and MoS₂ -PI-Gr composite solid lubricants were filled into the texture by hot-pressing method, then tribological performance comparison with the untreated smooth 45^# steel surface was carried out. Results The hardness of 45^# steel surface could reach up to 835HV and the friction coefficient caould be reduced by almost 50% through laser-texturing and quenching composite technology. Conclusion The hardness of 45^# steel surface could be increased and the friction coefficient could be reduced by laser-texturing and quenching composite technology, which would have a good engineering application prospect.