郭萍,赵永庆,洪权

• 1:西北有色金属研究院

摘要(Abstract)：

对TC4-DT钛合金进行不同热处理,获得不同的显微组织,研究不同显微组织的TC4-DT钛合金疲劳裂纹扩展速率。结果表明:两相区处理,较高的初生α相含量提供了较高的裂纹扩展阻力,不同的β晶粒尺寸使不同裂纹扩展阶段的扩展机理不同;在近门槛区,疲劳裂纹扩展速率主要受晶粒尺寸的影响;随着裂纹扩展,在裂纹扩展的低速阶段,β晶粒内片层α对裂纹扩展起主要作用;在中速扩展区,裂纹以条带机制扩展,并且粗糙的断口具有较低的裂纹扩展速率。

关键词(KeyWords)： TC4-DT钛合金;微观组织;疲劳裂纹扩展速率;疲劳断口

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51471136);; 中法国际合作项目(2015DFA51430)

作者(Author): 郭萍,赵永庆,洪权

DOI: 10.13289/j.issn.1009-6264.2017-0528

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