核阀零件激光熔覆Co基涂层的组织研究

Study on microstructure of laser cladding Co-base alloy on nuclear valve parts

摘要: 应用5kW横流CO2激光器对核阀阀瓣密封面进行Co基合金的激光熔覆处理,用金相显微镜、扫描电镜、能谱分析仪等分析手段对涂层的组织、晶粒度、显微硬度和稀释率进行了分析.结果表明:激光熔覆层的显微组织、晶粒度、熔层稀释率、热影响区宽度、显微硬度等均显著优于等离子喷焊和堆焊工艺.

Abstract: Laser cladding of Co-base alloy on the nuclear valve-sealing surface has been performed with a 5kW CO2 flow transverse laser.Optical microscope,SEM,and EDAX have been used to analyze the microstructure,the grain size,the micro-hardness,and the dilution rate.The results show that the microstructure,the grain size,the dilution rate,the width of heat-effect area,and the micro-hardness of the laser cladding coating are much better than those of the spurt welding and the bead welding processing.