异种耐热钢瞬时液相扩散连接界面形态与形成机理  

Interface morphology and formation mechanism of dissimilar steel joint with transient liquid-phase bonding

作　　者：唐恒娟[1] 陈思杰[2] 

机构地区：[1]河南理工大学电气工程与自动化学院,焦作454000 [2]河南理工大学材料科学与工程学院,焦作454000

出　　处：《焊接学报》2012年第3期101-104,118,共4页Transactions of The China Welding Institution

基　　金：河南理工大学引进人才基金资助项目(Y2009-1);博士基金资助项目(648313);金属材料学科资助项目(506081)

摘　　要：采用瞬时液相扩散连接双温工艺对异种耐热钢管进行了连接,使用氩气保护,FeNiCrSiB非晶箔作为扩散连接中间层.研究了异种耐热钢瞬时液相扩散连接界面的形成机理,测试了接头的组织和性能,采用激光共聚焦显微镜研究分析了界面形貌.结果表明,异种钢瞬时液相扩散连接时,液态中间层的结晶过程是在基体上联生生长,晶体长大具有方向性,少量杂质在接头中心以曲线状分布,形成了非直线型的连接界面.双温工艺的短时高温加热过程有利于破碎界面氧化物形成洁净连接晶面层,促进晶粒外延生长.The dissimilar steel pipes were joined by transient liquid-phase two-step heating bonding process with FeNiCrSiB amorphous foil in argon atmosphere.The microstructure and mechanical properties of the bonding joint were studied.The interface morphology of the transient liquid-phase bonding joint was analyzed by laser confocal microscopy.The testing results indicated that the solidification of the liquid interlayer occurred on the substrate and the grains grew along a specific direction.A curved interfacial layer formed because a small amount of impurities distributed in the center of the weld.The short-term high-temperature heating of transient liquid-phase two-step heating bonding process can promote the melting of the substrate and epitaxial growth of the grains.

关 键 词：异种钢 瞬时液相扩散连接 双温工艺 界面形态 外延生长 

分 类 号：TG459.9[金属学及工艺—焊接]