摘要
用自行研制的CuMnNi钎料对YG8硬质合金与42CrMo钢在不同钎焊温度、不同钎缝宽度下进行了真空钎焊工艺试验;用SEM、EPMA、EDS、润湿角测量仪和电子万能试验机等分析测试了焊接接头的显微组织、润湿角和三点弯曲强度。结果表明:该钎料对两种母材均具有良好的润湿性,最佳钎焊温度为1 030℃;在1 030℃下钎焊,钎缝宽度为0.3 mm时,可获得最高的接头抗弯强度510 MPa;在钎缝区存在铁、钴、镍等元素的长程扩散,并在钎缝界面处形成以FeCoNi为基的单相固溶体,有利于接头的冶金结合,提高其力学性能。
The vacuum brazing of YG8/42CrMo steel was studied with different process parameters such as brazing temperature and joint gap. A self-developed CuMnNi alloy was used as filler metal. Microstructure, wetting angle and 3 points bending strength of the brazed joints were analyzed by SEM, EPMA, EDS, contact angle meter and electronic universal testing machine. The results showed that this brazing filler metal had a good wettability to the two baseplates, and the optimum brazing temperature was 1 030 ℃. When the joint was brazed at 1 030 ℃ and the joint gap was 0. 3 mm the bending strength of joints reached a maximum value of 510 MPa. FeCoNi single-phase solid solution could be achieved by long range diffusion of Co, Fe and Ni in the interface, which could benefit the metallurgical combination joint and improve the mechanical properties.
出处
《机械工程材料》
CAS
CSCD
北大核心
2009年第2期35-38,共4页
Materials For Mechanical Engineering
作者简介
阙仲萍（1984-），女．福建龙岩人，硕士研究生。导师：王海龙副教授
