蠕铁气门座圈锥面激光熔覆钴基合金涂层工艺研究  

Researchon Process of Laser Cladding Cobalt-Based Alloy Coating on Vermicular Iron Valve Seat Cone

作　　者：郑子云[1] 刘红伟[1] 贾利[1] 李娜[1] 刘光[1] 

机构地区：[1]中国兵器科学研究院宁波分院,浙江宁波315103

出　　处：《应用激光》2014年第6期499-503,共5页Applied Laser

基　　金：浙江省国际科技合作专项资助项目(项目编号:2012C24011);宁波市工业攻关项目(项目编号:2012B100090;宁波市创新团队资助项目(项目编号:2014B82001);宁波市自然科学基金资助项目(项目编号:2014A610064)

摘　　要：为了提高蠕铁气门座圈密封锥面的耐磨性,采用3kW固体光纤激光器在气门座圈锥面激光熔覆Stellite 1钴基合金粉末,采用正交实验的方法分析了激光功率、旋转速度、送粉量和保护气流量等工艺因素对熔覆层硬度、组织和裂纹缺陷的影响。结果表明:熔覆层平均硬度达6.64GPa以上,较基体提高了2.32倍以上;熔覆层与基体能形成良好的冶金结合;获得了蠕铁气门座圈激光熔覆钴基合金的最佳工艺为:激光功率1 200W、旋转速度3r/min、送粉量10g/min、保护气流量7L/min。对上述工艺制备出的熔覆气门座圈进行了气门/气门座冲击磨损模拟试验,并与未经处理的气门座圈进行了对比试验,结果表明:蠕墨铸铁气门座圈激光熔覆钴基合金涂层后其耐磨损性能是未处理气门座圈的2.87倍。In order to study the laser surface micro texturing process and its influence on the bonding properties of the film-based, using the fiber laser on the cemented carbide surface to make the micro texture modeling （the micro dimple with different diameter, different depth and different density）, choosing the PVD method to deposite the TiAlN coating on the cemented carbide with Ultra high vacuum multifunctional magnetron sputtering system; measuring the microhardness on the surface of the coating by the HXD-1000TMSC/LCD microhardness tester; using the X-350 A X-Ray stress analyze to test the surface residual stress after the micro-textured substrate and the section of the residual stress after the coating. The research shows that： the laser micro-texture of the cemented carbide substrates has influence on the micro hardness of the coating surface, and the texture density has greater influence on the micro hardness; The laser micro texture of the cemented carbide surface produced the residual stress on the substrate, the distance of the pits has little effect on the residual stress, but the texture density has greater impact on it.

关 键 词：蠕墨铸铁 激光熔覆 钴基合金 耐磨性 

分 类 号：TG174[金属学及工艺—金属表面处理]