镍基高温合金K4169熔敷金属间化合物CrFeNb熔合区微观组织结构  

Microstructure of fusion zone deposited intermetallics CrF eN b on Nickel-base superalloy K4169

作　　者：刘瑞瑞[1] 赵志龙[1] 艾昌辉[1] 李景伟[2] 刘林[3] 

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 [3]西北工业大学凝固技术国家重点实验室,西安710072

出　　处：《焊接学报》2015年第2期71-74,116-117,共6页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51054007;51374173);"高档数控机床与基础制造装备"科技重大专项资助项目(20092X04006-042)

摘　　要：采用氩弧熔敷的方法在镍基高温合金K4169表面熔敷高温金属间化合物Cr Fe Nb.利用扫描电镜(SEM)和能谱分析(EDS)及X射线衍射(XRD)分析研究熔合区的微观组织特征及成分分布.结果表明,在K4169与高温金属间化合物之间形成了约42μm厚度的熔合区;熔合区无气孔、裂纹等缺陷,基材与熔敷金属材料呈冶金结合.根据能谱分析和X射线分析发现熔合区由γ,γ',Fe2Nb和Cr Fe Nb相组成,这些相以细小的基材组织、白色块状组织及菊花状组织形式存在;联生方式结晶和高熔点Cr Fe Nb相形核使熔敷金属材料Cr Fe Nb与基材K4169呈现嵌套结构.High temperature inter-metallic compound CrF eN b coating was deposited on Nickel-base superalloy( K4169) by argon arc cladding process. Scanning electron microscope( SEM),energy-dispersive spectrum( EDS) and X-ray diffraction( XRD) were used to analyze the microstructure and composition distribution of the cladding coating. The results showed that the fusion layer with thickness of 42 μm formed between K4169 and high temperature intermetallic compound.There are no metallurgical defects such as pores or cracks in the fusion zone. The metallurgical bonding is realized between the substrate and the CrF eN b coating. Based on the EDS and XRD analysis,it is found that the fusion zone is composed by γ,γ',Fe2Nb phase and CrF eN b phase,and all these phases are existed in the ways of tiny based-material,white block and chrysanthemum structure. A nested structure is formed between the deposited metal material CrF eN b and based-material K4169 by epitaxial solidification and taking high melting point CrF eN b phase as nucleation.

关 键 词：氩弧熔敷 金属间化合物 熔合区 微观组织 

分 类 号：TG132.3[一般工业技术—材料科学与工程] TG174.4[金属学及工艺—合金]