李波,秦锋英,林苑,张开铭,袁武华

• 1:中航工业第一飞机设计研究院
• 2:湖南大学材料科学与工程学院

摘要(Abstract)：

采用光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)和疲劳试验机等研究了不同温度时效处理后TB18钛合金的显微组织和高周疲劳行为。结果表明：随着时效温度的升高，TB18钛合金中片层α相的析出逐渐增多，500、525和550℃时效后显微组织的特征分别为集束结构、集束+网篮结构和网篮结构；当时效温度为525℃时，TB18钛合金屈服强度为1231 MPa、抗拉强度为1303 MPa、伸长率为5.8%、高周疲劳寿命为26530周次，具有较佳的综合性能；在高周疲劳状态下，断裂方式为韧性断裂，主裂纹表现为沿晶和穿晶相结合的裂纹扩展模式；此外，微裂纹的萌生机制主要表现为片层α相内产生的位错堆积形成微裂纹、α/β相界面产生的大量滑移线和位错堆积形成微裂纹两种。

关键词(KeyWords)： TB18钛合金;微观组织;高周疲劳;断口形貌;微裂纹

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 李波,秦锋英,林苑,张开铭,袁武华

DOI: 10.13289/j.issn.1009-6264.2024-0445

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