陈艳娜,熊毅,范梅香,岳赟,姚怀,任凤章

• 1:河南科技大学材料科学与工程学院
• 2:有色金属共性技术河南省协同创新中心
• 3:高端轴承摩擦学技术与应用国家地方联合工程实验室

摘要(Abstract)：

借助光学显微镜(OM)、扫描电镜(SEM)和透射电镜(TEM)等研究了TC11钛合金不同温度下高周疲劳断口及断口附近的微观组织形貌。结果表明:TC11钛合金不同温度下的疲劳断口均由疲劳源区、裂纹扩展区和瞬断区3部分组成,裂纹扩展区存在大量的二次裂纹,随着温度的增加,二次裂纹数量逐渐增多的同时其长度与宽度也明显增加,且在二次裂纹附近出现微裂纹,疲劳辉纹的宽度从0.2μm(-30℃)增加到1μm(150℃),相应的疲劳极限也随着实验温度的升高而降低,该实验条件下疲劳极限值从438 MPa(-30℃)降至388 MPa(150℃),温度越高疲劳寿命越短。不同温度下随着循环周次的增加,钛合金内部出现位错或形变孪晶等亚结构来协调变形,低温下变形组织以位错缠结和形变孪晶混合型组织为主,高温下则以位错缠结为主,同时β片层发生明显的断裂现象,在α/β相界面的位错堆积导致的应力集中是疲劳裂纹源形成的主要原因。

关键词(KeyWords)： 钛合金;高周疲劳微观组织;二次裂纹;疲劳辉纹

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(U1804146,51801054);; 河南省高校科技创新人才支持计划项目(17HASTIT026);; 河南省国际科技合作计划项目(172102410032);; 河南省教育厅科技计划项目(16A430005);; 河南科技大学科技创新团队资助项目(2015XTD006)

作者(Author): 陈艳娜,熊毅,范梅香,岳赟,姚怀,任凤章

DOI: 10.13289/j.issn.1009-6264.2019-0097

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