夏纯阳,虞钢,何秀丽,李少霞,宁伟健,苗海宾

• 1:中国科学院力学研究所
• 2:中国科学院大学工程科学学院

摘要(Abstract)：

采用高密度Nd:YAG固态连续激光器对N6纯镍和304奥氏体不锈钢进行了焊接工艺实验,探究了激光功率和离焦量对焊缝成形的影响。对接头进行了拉伸强度和硬度的测试,并结合光学显微镜(OM)、扫描电镜(SEM)、能谱分析仪(EDS)等手段分析了接头的微观组织。结果表明:N6纯镍一侧热影响区晶粒长大明显,焊缝区靠近两侧熔合线附近为向焊缝中心区域生长的柱状晶,焊缝中心区域存在细小的胞晶区域;N6热影响区的显微硬度最低,焊缝的显微硬度介于N6镍母材和304不锈钢母材之间;接头拉伸断裂位置在焊缝区,抗拉强度达到N6纯镍母材的90%以上,可以满足实际情况下的使用要求。拉伸断口表现为准解理断裂。

关键词(KeyWords)： 纯镍;304不锈钢;激光异种焊接;组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(11272317,11502269)

作者(Author): 夏纯阳,虞钢,何秀丽,李少霞,宁伟健,苗海宾

DOI: 10.13289/j.issn.1009-6264.2017-0059

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