张骞,毛智勇,李立航,付鹏飞,赵桐,唐振云

• 1:中国航空制造技术研究院高能束流加工技术重点实验室

摘要(Abstract)：

采用电子束扫描对Ti-22Al-24Nb-0.5Mo合金进行了250～550℃的预热及电子束焊接工艺试验,利用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射仪(XRD)等对接头显微组织特征进行了分析,分析了不同预热温度下焊缝的组织形貌,研究了预热对接头成形及其室温、高温拉伸性能的影响。结果表明,随着预热温度升高,焊缝中心等轴晶组织比例相应增加,焊缝中心结合线随之消失,柱状晶组织生长受到阻碍,这可能是横向温度梯度降低,结晶潜热无法被及时传导造成的。预热焊接接头室温抗拉强度、断后伸长率可达980 MPa、12%以上,与母材水平相当;与常规焊接相比,预热接头650℃拉伸强度提高了35%～60%,断后伸长率提高了两倍以上,350℃预热接头高温拉伸强度最高。接头拉伸性能的改善,与预热工艺对焊缝中心结合线、焊缝组织均匀性的影响密切相关。

关键词(KeyWords)： Ti_2AlNb;电子束焊接;预热;显微组织;拉伸性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 张骞,毛智勇,李立航,付鹏飞,赵桐,唐振云

DOI: 10.13289/j.issn.1009-6264.2021-0066

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