摘要
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 laser quenching test was made on the surface of MoCr cast iron by CO2 laser, the microstructure, hardness, and wear resistance of the phase transformation hardening layer were tested and analysed. The results show that the average hard- ness reaches 647 HV0.2, which is 2.4 times as high as the matrix after the laser quenching. The enhancement of hardness is attributed to the grain refining and the formation of supersaturated marten site during laser quenching. The wear mechanism of the MoCr cast iron matrix is abrasive wear and adhesive wear, and the phase transformation hardening layer is abrasive wear, the wear resistance advances 66.7% after laser quenching.
出处
《应用激光》
CSCD
北大核心
2015年第6期657-660,共4页
Applied Laser
