摘要
采用BNi-2镍基钎料对304奥氏体不锈钢在950、1050、1150℃温度条件进行氩气保护钎焊,通过金相显微镜、扫描电镜及万能试验机等对钎焊接头显微组织、钎缝元素分布及剪切性能进行了测试。结果表明:钎缝组织由Ni基固溶体和Cr_2B化合物构成,随着温度升高,钎料中B元素向母材扩散愈充分,界面处沿晶析出Ni_3B。在1050℃条件下,钎缝处固溶体相增多,塑性变形能力增强,最大剪切强度值为92 N/mm^2。
Argon shielded brazing of 304 austenitic stainless steel was carried out at 950℃, 1050℃ and 1150℃ using BNi-2 filler metal. The microstructure, element distribution of the brazed joints and shearing strength of the steel were investigated by microscope, SEM and EDS and universal tester. The results show that the brazed region consists of Ni solid solution and Cr_2B eutectic, element B in the brazing seam diffuses sufficiently with the increase of temperature, and Ni_3B precipitates along austenite grain boundary closing to the brazed region. The formation of Ni solid solution enhances the capability of plastic deformation, and an excellent bonding with shear of 92 N/mm^2 can be obtained at 1050℃.
出处
《热加工工艺》
CSCD
北大核心
2016年第1期238-240,共3页
Hot Working Technology
基金
徐州工程学院大学生创新创业课题(XGY2014135)
江苏省大型工程装备检测与控制重点建设实验室开放课题(JSKLEDC201412)
