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选用CO2激光器在MoCr铸铁表面进行激光淬火试验,对相变硬化层的显微组织、硬度及耐磨性能进行了测试与分析。结果表明,经激光淬火后,相变硬化层的平均硬度可达647 HV0.2,是基体硬度的2.4倍。激光淬火所造成的组织细化和过饱和马氏体组织的形成是硬度提高的主要原因。MoCr铸铁基体的磨损机制为粘着磨损和磨粒磨损,相变硬化层的磨损机制以磨粒磨损为主,基体经激光淬火后耐磨性能提高了66.7%。
The CO2 laser was used to laser quench the surface of MoCr cast iron, and the microstructure, hardness and wear resistance of the phase-change hardened layer were tested and analyzed. The results show that after laser quenching, the average hardness of the phase-change hardened layer can reach 647 HV0.2, which is 2.4 times of the hardness of the substrate. Laser quenching caused by tissue refinement and supersaturation martensite formation is the main reason for the increase in hardness. The wear mechanism of MoCr cast iron matrix is adhesive wear and abrasive wear, and the wear mechanism of phase transformation hardened layer is mainly abrasive wear. The wear resistance of the matrix after laser quenching is improved by 66.7%.