激光和TIG堆焊钴基合金的性能  

Characteristics of Co-based clad layer formed by laser and TIG cladding

作　　者：徐国建[1] 黄雪[1] 杭争翔[1] 傅新皓[1] 于恩洪[2] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]沈阳新松机器人自动化股份有限公司,沈阳110168

出　　处：《焊接学报》2013年第8期22-26,114,共5页Transactions of The China Welding Institution

基　　金：辽宁省自然科学基金资助项目(20092047)

摘　　要：为了提高马氏体不锈钢蒸汽涡轮叶片的性能,采用Nd:YAG激光、CO2激光、半导体激光和TIG堆焊方法,在12%Cr马氏体不锈钢表面堆焊了钴基合金粉末(Stellite-6).通过X射线衍射分析、电子探针分析、能谱分析和耐磨试验,研究了堆焊层的形状、稀释率、维氏硬度、DAS(枝晶间距)值、显微组织和耐磨性能,并比较了不同堆焊方法的特点.与TIG堆焊相比,激光堆焊方法的堆焊层具有更小的稀释率、细小的显微组织、狭窄的热影响区、高的维氏硬度、优良的耐磨性、高的钴含量和低的铁含量的特点.In order to improve the performance of martensitic stainless steel steam turbine blade,pulsed Nd: YAG laser,CO2 laser,diode laser,and TIG cladding were carried out to deposite Stellite-6 powder on the surface of 12%Cr martensitic stainless steel plate.The shape of cladding layer,dilution,Vickers hardness,dendrite arm spacing(DAS) value,microstructure and wear resistance were investigated with X-ray diffraction,EPMA,EDS and wear test.And the characteristics of different cladding processes were compared.It was found that laser cladding processes,comparing with TIG cladding,have smaller dilution rate,finer microstructure,narrower heat-affected zone,higher Vickers hardness,better wear resistance,higher Co content,and lower Fe content in the resultant cladding layer.

关 键 词：激光堆焊 显微组织 维氏硬度 耐磨性 稀释率 

分 类 号：TG456.9[金属学及工艺—焊接]