王龙,陈益平,程东海,胡德安,曹泽安

• 1:南昌航空大学航空制造工程学院

摘要(Abstract)：

采用光学显微镜(OM)、扫描电镜(SEM)和X射线衍射(XRD)等研究了置氢量分别在0%、0.05%、0.16%和0.37%时的TC4钛合金激光焊接头的显微组织及相变,并用数字显微硬度计分析置氢后接头硬度的变化规律,阐述其影响机制。结果表明:随着置氢量的增加,母材中的α相减少,β相增加;焊缝组织由针状马氏体α′相转变为片层状组织,且母材和焊缝组织向同一方向转变。接头显微硬度随置氢量的增加逐渐降低,且母材和焊缝的硬度差值逐步缩小,当置氢量为0.37%时,焊缝和母材的硬度差最小,为13 HV。置氢量影响TC4钛合金接头硬度的原因是接头中软化相β、氢化物δ和氢的固溶强化等引起的多种相变的作用。

关键词(KeyWords)： 置氢量;针状马氏体;组织差异性;氢的固溶强化

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51465042)

作者(Author): 王龙,陈益平,程东海,胡德安,曹泽安

DOI: 10.13289/j.issn.1009-6264.2019-0467

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