TIG焊FeAlNbB堆焊层的组织与性能  

Microstructure and Properties of FeAlNbB Surfacing Layer Prepared by TIG Welding

作　　者：赵飞[1] 周勇[1] 党墨含 邢晓芳 ZHAO Fei;ZHOU Yong;DANG Mohan;XING Xiaofang(School of Material Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China)

机构地区：[1]西安石油大学材料科学与工程学院,陕西西安710065

出　　处：《热加工工艺》2020年第5期53-56,共4页Hot Working Technology

基　　金：西安石油大学研究生创新与实践能力培养项目(YCS172 11038);西安石油大学《材料科学与工程》省级优势学科资助项目(YS37020203).

摘　　要：采用药芯焊丝TIG堆焊方法在20钢表面制备了FeAlNbB堆焊层。借助光学显微镜(OM)、扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)和显微硬度计对堆焊层的微观组织、相结构、显微硬度等性能进行了测试分析。结果表明:堆焊层组织均匀,结构致密,无气孔及裂纹等缺陷,与基体实现了良好的冶金结合;堆焊层组织主要为铁素体基体上弥散分布着金属间化合物,熔合线附近有少量魏氏体组织形成,热影响区出现了少量贝氏体组织;堆焊层主要由α-Fe、Fe3Al、FeAl相组成,并含有少量的Al2O3相;堆焊层的平均硬度为736 HV0.1左右,较基体有明显提高,有利于改善材料的耐磨损性能。The FeAlNbB surfacing layer was prepared on the surface of 20 steel by flux-cored wire argon tungsten-arc welding. The microstructure, phase structure and microhardness of the surfacing layer were analyzed by optical microscope(OM), scanning electron microscope(SEM), energy dispersive spectrometry(EDS), X-ray diffraction(XRD) and microhardness tester. The results show that the surfacing layer presents uniform and dense microstructure with defect-free of pore and crack,and good metallurgical bond with the substrate.The microstructure of the surfacing layer is mainly ferrite matrix with dispersed intermetallic compounds, and a small amount of widmanstatten structure is generated near the fusion line.A small amount of bainite is found in the heat affected area. The surfacing layer is mainly composed of α-Fe, Fe3Al, FeAl as well as a little Al2O3 phase. The average microhardness of the surfacing layer is about 736 HV0.1, and its mean microhardness is obviously higher than that of substrate, which can improve the anti-wear property of the material.

关 键 词：TIG堆焊 FeAlNbB堆焊层 组织 性能 

分 类 号：TG455[金属学及工艺—焊接]