Fe<sub>3</sub>Al/18-8扩散焊接头的组织特征分析

王娟; 李亚江; 马海军; 刘鹏

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Fe₃Al/18-8扩散焊接头的组织特征分析
王娟¹, 李亚江^1,2, 马海军¹, 刘鹏¹
1.山东大学材料液态结构及其遗传性教育部重点实验室, 济南 250061;2.哈尔滨工业大学现代焊接生产技术国家重点实验室, 哈尔滨 150001

摘要:

采用扫描电镜,X射线衍射仪和透射电镜分析了Fe₃Al/18-8扩散焊接头的显微组织特征。结果表明,加热温度1040℃、保温时间60 min、焊接压力15 MPa时获得的Fe₃Al/18-8扩散焊接头抗剪强度达226 MPa。接头处形成具有三个扩散反应层的过渡区,其相结构依次由(FeAl+Fe₃Al)、Ni₃Al相和α-Fe(Al)固溶体组成。显微硬度峰值为610HM,不存在FeAl₂(820HM)、Fe₂Al₅(990HM)和FeAl₃(1030HM)等脆性相,有利于保证Fe₃Al/18-8扩散焊接头的组织性能。

关键词: Fe₃Al/18-8扩散焊接头显微组织显微硬度相结构

DOI：

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基金项目:国家自然科学基金资助项目(50375088);山东省自然科学基金资助项目(Y2003F05)

Microstructure characteristics of Fe₃Al/18-8 diffusion welded joint

WANG Juan¹, LI Ya-jiang^1,2, MA Hai-jun¹, LIU Peng¹

1.Key Lab of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, Jinan 250061, China;2.National Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 15001, China

Abstract:

Fe₃Al intermetallic and 18-8 stainless steel were vacuum diffusion welded and an obvious Fe₃Al/18-8 diffusion welded joint with three reaction layers was formed. Microstructure and phase structure of the joint were researched by means of scanning electron microscope, X-ray diffractometry and transmission electron microscope. The results indicate that shear strength of the Fe₃Al/18-8 diffusion welded joint which was obtained at 1 040℃ for 60 min with a pressure of 15 MPa is up to 226 MPa. And there are FeAl, Fe₃Al, Ni₃Al phases and α-Fe (Al) solid solution from Fe₃Al to 18-8 in the joint. The peak microhardness was measured to be 610 HM and there were no brittle phases such as FeAl₂ (820 HM), Fe₂Al₅ (990 HM), FeAl₃ (1030 HM).

Key words: Fe₃Al/18-8 diffusion welded joint microstructure microhardness phase structure