摘要
采用激光加工方法在 45号钢基体上熔覆表面铜合金涂层 ,试验研究了激光加工工艺参数 (激光功率、扫描速度 )对熔覆层组织特点和耐摩擦磨损性能的影响规律。试验发现 ,激光功率较大或扫描速度较慢时熔覆层中出现了富铁相 ,其形态分为球状和枝晶状两种 ,球状富铁相一般出现在熔覆层中上部 ,枝晶状富铁相一般出现在熔覆层底部 ,富铁相中一般含有少量的铜和锡 ,有的富铁相冷却时转变为马氏体组织。富铁相对铜合金熔覆层与 40Cr摩擦副摩擦磨损不利 。
The laser processing was applied to carry out laser cladding Cu alloy coatings on 45 steel substrate.The effect of processing parameters,such as laser power,laser scanning speed,on the microstructures and friction resistance of the coatings was researched.The iron rich phase was found to appear in the coatings when the laser power was higher or scanning speed was slower,it is divided into sphere and dendrite formation in morphology,the spherical iron rich phase is found near the upper of coating layer and the branch iron rich phase in the bottom.It includes a few of Cu and Sn,some of the iron rich phase tranformed into martensite while colling.It is harmful to friction resistance of Cu alloy coatings against the 40Cr friction wheel,but it is benefit to the coatings against the hard alloy friction wheel.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2002年第1期69-72,80,共5页
Transactions of The China Welding Institution
基金
现代焊接生产技术国家重点实验室开放基金资助项目
