史振学,李嘉荣,刘世忠,韩梅,刘维维

• 1:北京航空材料研究院先进高温结构材料国防科技重点实验室

摘要(Abstract)：

研究了含0.34%Hf DD6单晶高温合金在760℃下的低周疲劳行为,对其疲劳裂纹的萌生与扩展进行了分析。结果表明,含0.34%Hf DD6合金比含0.10%Hf的疲劳寿命稍有降低;其损伤以弹性损伤为主。疲劳裂纹萌生于试样表面、亚表面或试样内部后,先沿垂直应力轴方向扩展,后沿{111}面扩展。其断裂机制为类解理断裂。断口上有典型的疲劳条带。断裂组织分析表明,位错主要在基体通道中扩展,变形后期切过γ'相,形成滑移带。

关键词(KeyWords)： DD6;单晶高温合金;低周疲劳

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 史振学,李嘉荣,刘世忠,韩梅,刘维维

DOI: 10.13289/j.issn.1009-6264.2011.05.009

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