刘砚飞,丁承尧,贺进,钟燕,田伟,余心宏,王建国

• 1:中国航发四川燃气涡轮研究院
• 2:西北工业大学材料学院

摘要(Abstract)：

对固溶+时效处理的GH4169合金板材分别进行了不同时间的应力时效和无应力时效处理，采用光学显微镜(OM)、扫描电镜(SEM)和电子万能试验机等分析了不同应力时效处理后合金的显微组织和室温拉伸性能。结果表明：应力对GH4169合金板材的显微组织无明显影响，经过应力时效和无应力时效处理后γ″相仅发生略微粗化，尺寸由19.02 nm增长至23 nm左右，仍为圆形颗粒状形貌。无应力时效处理对板材的室温拉伸性能基本无影响，这是由于GH4169合金板材的室温变形机制为位错做剪切γ″相运动，板材经无应力时效处理后γ″相的尺寸与经固溶+时效处理的γ″相的尺寸相当，位错剪切γ″所需的应力相当使得室温拉伸性能未变化。随应力时效时间的增加，板材的室温拉伸强度逐渐降低，室温拉伸塑性逐渐增加，这是由于应力时效过程中板材已发生残余塑性变形，位错已切入γ″相，后续室温拉伸过程中，位错再次剪切γ″相所需的应力减小进而导致板材室温拉伸强度降低，拉伸塑性增加。

关键词(KeyWords)： GH4169合金板材;应力时效;显微组织;室温拉伸性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 刘砚飞,丁承尧,贺进,钟燕,田伟,余心宏,王建国

DOI: 10.13289/j.issn.1009-6264.2023-0403

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