丁天胜,张显程,涂善东,轩福贞

• 1:华东理工大学机械与动力工程学院承压系统与安全教育部重点实验室

摘要(Abstract)：

采用两种不同热处理工艺对GH4169合金进行处理,观察并研究了合金的显微组织变化以及在5个应变幅(1.2%、1.0%、0.8%、0.6%和0.5%)和650℃条件下δ相对合金低周疲劳性能的影响。结果表明:随着900℃保温时间的延长,合金δ相的析出量增加。合金在高应变幅(Δεt/2≥0.6%)下的疲劳寿命基本不受δ相含量变化的影响;而在较小应变幅下(Δεt/2=0.5%)的疲劳寿命则具有一定的分散性,并随着δ相含量的增加而增加;与此同时,合金的塑性应变-寿命曲线在常温下具有的双线性特征在650℃高温下却不再具有,而且疲劳断口在相同应变幅下呈现出相似的形貌,裂纹源数量也随着应变幅的增加而增加。

关键词(KeyWords)： 热处理;GH4169合金;δ相;高温低周疲劳

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51322510)

作者(Author): 丁天胜,张显程,涂善东,轩福贞

DOI: 10.13289/j.issn.1009-6264.2016.04.014

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