镍基高温金属熔敷CrFeNb陶瓷熔合层微观组织  

Microstructure analysis of fusion layer melted CrFeNb on Ni-base superalloy

作　　者：艾昌辉[1] 赵志龙[1] 苏建[1] 李景伟[2] 

机构地区：[1]西北工业大学机电学院,西安710072 [2]西北工业大学工程训练中心,西安710100

出　　处：《焊接学报》2011年第9期61-64,116,共4页Transactions of The China Welding Institution

基　　金：国家重点基础研究发展计划(2006CB605202-2);国家自然科学基金资助项目(50874093);高档数控机床与基础制造装备科技重大专项(2009ZX04006-042)

摘　　要：采用氩弧熔焊的方法在镍基高温合金K4169表面熔敷高温金属间化合物CrFeNb.利用电镜扫描（SEM）和能谱分析（EDS）观察熔敷区的微观组织及元素分布.结果表明,基材K4169与高温金属间化合物CrFeNb之间形成了厚度约64.8μm的熔合层;熔合层中无气孔、裂纹等缺陷,凝固的CrFeNb相呈枝晶状伸入基材K4169中并与之交错连接,形成了良好的冶金结合;依据原子数比例关系,熔合层中形成了两种新的Cr-Fe-Ni-Nb系复合相,分别为Cr（7.16~25.0）-Fe（6.39~23.4）-Ni（10.6~56.9）-Nb和Cr（1.60~3.48）-Fe（1.44~3.11）-Ni（2.84~7.20）-Nb.A coating has been made on K4169 substrate by argon arc cladding technique with the inter-metallic compound(IMC) of CrFeNb.The microstructure and element distribution of the cladding coating were analyzed by scanning electron microscope(SEM) and energy-dispersive spectrum(EDS).The results showed that a fusion layer with a thickness of 64.8 μm was formed between the K4169 substrate and CrFeNb.In the fusion layer,the dendritic solidification of cladding CrFeNb stretched into the substrate and cross joined,which formed favorable metallurgical conjunction without the metallurgical defects such as alveolate air holes or cracks.According to the proportion relationship of atomic numbers,two new composite phases of Cr-Fe-Ni-Nb were formed in the fusion layer,and the calculated results showed that they were Cr(7.16～25.0)-Fe(6.39～23.4)-Ni(10.6～56.9)-Nb and Cr(1.60～3.48)-Fe(1.44～3.11)-Ni(2.84～7.20)-Nb,respectively.

关 键 词：氩弧熔焊 金属间化合物 熔合层 凝固 

分 类 号：TG174.4[金属学及工艺—金属表面处理]