CO_2激光和等离子堆焊镍基合金粉末的性能  

Properties of Ni-based alloy powder cladding layer by CO_2 laser beam and plasma

作　　者：徐国建[1] 董士龙 杭争翔[1] 张翼飞[2] 李永波[2] 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]沈阳新松机器人自动化股份有限公司,沈阳110168 [3]最新激光技术研究中心

出　　处：《焊接学报》2013年第12期50-54,3,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：为了提高核发电成套设备的阀体(材质为SUS316LN不锈钢)性能,在SUS316LN不锈钢上采用CO2激光和等离子堆焊镍基合金粉末.利用激光显微镜,扫描电子显微镜(SEM)、X射线衍射(XRD)、电子探针(EPMA)和能谱(EDS)等分析了堆焊层的组织形态和性能.结果表明,堆焊层属于过共晶组织;初晶相由硼化物(CrB)和碳化物(Cr7C3)组成,而共晶组织由富镍奥氏体(γ-Ni)+CrB或富镍奥氏体(γ-Ni)+Cr7C3组成;与等离子堆焊相比,CO2激光堆焊层具有更高的耐磨性能、细小的晶粒组织、低的稀释率和高的堆焊效率.To improve the properties of SUS316LN stainless steel in power plant part,a cladding layer was deposited on the surface of SUS316LN stainless steel by laser cladding and plasma cladding.The cladding layer was analyzed by the laser microscope,scanning electronic microscope(SEM) and X-ray diffraction(XRD),electronic probe(EPMA) and energy dispersive spectrometer(EDS).The results indicate the cladding layer belongs to hypereutectic structure.Primary phase is made of boride(CrB) and carbide(Cr 7 C 3),and eutectic structure is made of γ-Ni + CrB or γ-Ni + Cr 7 C 3.Compared with plasma cladding layer,the CO 2 laser cladding layer has higher wear resistance,smaller microstructure,lower dilution and higher cladding efficiency.

关 键 词：CO2激光堆焊 等离子堆焊 过共晶组织 共晶组织 初晶相 

分 类 号：TG456.9[金属学及工艺—焊接]