陈琪,肖述广,王超,谢志雄,罗平,董仕节,解剑英

• 1:湖北工业大学绿色轻工材料湖北省重点实验室
• 2:武汉轻工大学机械工程学院
• 3:武汉市博钛新材料科技有限公司

摘要(Abstract)：

采用光学显微镜和扫描电镜分析了壁厚为0.5 mm的TA2钛管高频感应焊接接头的组织，并对焊缝和母材进行了力学性能测试。结果表明：当焊接速度为60 m/min,焊接功率为18～21 kW,热输入为18～21 kJ/m,挤压量为0.200 mm时可获得成形性好、无宏观缺陷的焊接接头，焊缝连续笔直，表面无裂纹，外毛刺连续均匀。焊接接头组织在焊后冷却过程中发生了不完全转变，部分α相转变为α′相，焊缝及热影响区的组织由粗大锯齿状α相和部分针状α′(针状马氏体)相组成。焊缝及母材显微硬度呈“M”型对称分布，两侧热影响区硬度最高，母材次之，焊缝中心硬度最低。焊接热影响区针状马氏体的存在是导致硬度显著高于母材的主要原因。在合适的工艺条件下，焊接接头的平均抗拉强度为446.8 MPa,达到母材的82%;伸长率为16%,低于母材(26%),焊接接头断口有明显的韧性断裂特征。

关键词(KeyWords)： 薄壁钛管;高频感应焊接技术;针状马氏体;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51771071)

作者(Author): 陈琪,肖述广,王超,谢志雄,罗平,董仕节,解剑英

DOI: 10.13289/j.issn.1009-6264.2021-0624

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