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304不锈钢/T2紫铜电子束焊接熔池凝固行为及组织性能研究 预览

Study on solidification behavior and microstructure-property of 304 SS/T2 copper electron beam welded joints
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摘要 采用电子束作为焊接热源,通过调节功率输出及不同的焊接偏置,研究了304奥氏体不锈钢与T2紫铜熔化焊的熔池凝固行为及组织性能特征。采用光学显微镜、扫描电镜、能谱、拉伸等分析测试方法对接头特征进行了表征,其结果表明,304不锈钢和T2紫铜电子束焊接可获得良好的焊缝成形,接头无明显气孔,微裂纹等缺陷。接头最高拉伸强度可达246 MPa,接近等强于铜基材。束流偏置对接头强度具有很大影响,铜侧偏置易引起铜侧热影响区晶粒粗大,钢侧偏置易引起熔合不良及热裂纹形成。钢和铜之间不形成脆性金属间化合物,焊缝的相组成主要为ε相、γ相及晶间α相。 The solidification behavior and microstructure characteristics of EB welded joints of 304 austenitic stainless steel to T2 copper were studied by adjusting the power output and different welding offsets. The joint characteristics were characterized by optical microscopy,scanning electron microscopy,energy dispersive spectroscopy and tensile test. The results show that good weld appearance of 304 stainless steel to T2 copper can be obtained by EB welding,and the joint has no obvious defects such as porosity and micro-cracks. The highest tensile strength of the joint reaches up to 246 MPa,which is nearly equal to that of copper substrate. Beam offset has a great influence on the strength of the joints. Beam focus on copper can result in coarse grains in the heat affected zone of copper side,and focus on steel side can lead to bad fusion and hot crack formation. There is no brittle intermetallic compounds between steel and copper. The phase composition of weld is mainly composed of ε phase,γ phase and intragranular α phase.
作者 郭顺 彭勇 周琦 王克鸿 崔崇 Guo Shun;Peng Yong;Zhou Qi;Wang Kehong;Cui Chong(Nanjing University of Science and Technology,Nanjing 210094,China;Key Laboratory of controlled arc Intelligent Additive Manufacturing,Nanjing 210094,China)
出处 《焊接》 2019年第2期6-10,65共6页 Welding & Joining
基金 国家自然科学基金资助项目(51375243,51505226).
关键词 电子束焊接 304不锈钢 铜合金 凝固行为 力学性能 electron beam welding 304 stainless steel copper alloy solidification behavior mechanical properties
作者简介 第一作者:郭顺,1990年出生,博士研究生;主要从事异种金属连接方面的科研工作,已发表论文10余篇;通信作者:彭勇,1984年出生,博士,副教授。
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