蒸汽发电机叶片激光堆焊层的性能  

Performances of laser overlay cladding on blade of steam generator

作　　者：徐国建[1] 丁小粉 王志一 邢飞 黄雪 武斌斌 沓名宗春 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]朝阳重型机器有限公司技术中心,辽宁朝阳122000 [3]鞍山煜宸科技有限公司研发部,辽宁鞍山114051 [4]最新激光技术研究中心研发部,爱知安城4460026

出　　处：《沈阳工业大学学报》2014年第3期269-274,共6页Journal of Shenyang University of Technology

基　　金：国家外国专家局基金资助项目(GDW20122101064)

摘　　要：为了提高蒸汽发电机叶片(SUS403不锈钢)的耐磨性能和耐气蚀性能,采用4 kW光纤耦合传输半导体激光器堆焊系统在SUS403不锈钢叶片上堆焊了钴基合金粉末.确定了最佳激光堆焊参数,并通过光学显微镜、扫描电子显微镜、电子探针分析、x-射线衍射分析、显微硬度计和磨损试验机对堆焊层的显微组织、相组成、微区成分、维氏硬度和耐磨性能进行了研究.结果表明,堆焊层组织中的亚共晶组织的初晶相由富Co的γ奥氏体组成,而共晶组织由富Co的γ奥氏体和复杂的碳化物组成.堆焊后的叶片使用寿命提高了3倍以上.In order to enhance the wear and cavitation resistances of blade of steam generator,the Co-based alloy powder was deposited on the SUS403 stainless steel blade with the 4 kW fiber coupled transmission diodelaser overlaying system. The optimal laser overlay parameters were determined. In addition,the microstructure,phase constitute,micro area composition,Vickers hardness and wear resistance of laser overlay cladding were investigated with the optical microscope（ OP）, scanning electron microscope（ SEM）,electronic probe analysis,x-ray diffraction（ XRD） analysis,micro-hardness tester and wear testing machine. The results showthat the microstructure of overlay cladding belongs to hypoeutectic structure,where the primary phase is the Co-rich γ austenite and the eutectic structure consists of Co-rich γ austenite and complex carbides. The service life of blade after the laser overlay gets enhanced more than 3 times.

关 键 词：激光堆焊 钴基合金 维氏硬度 耐磨性能 稀释率 亚共晶组织 初晶相 共晶组织 

分 类 号：TG456.7[金属学及工艺—焊接]