张姝,田素贵,梁福顺,黎阿男,李晶晶

• 1:沈阳工业大学材料科学与工程学院
• 2:沈阳化工大学机械工程学院

摘要(Abstract)：

通过[001]取向镍基单晶合金压缩蠕变性能测试及组织形貌观察,确定出合金经压应力蠕变后的组织结构是γ'相沿平行于应力轴方向形成P-型筏状组织。采用三维应力应变有限元方法计算出立方γ/γ'两相共格界面的Von Mises应力分布,研究了施加应力对应力分布及γ'相定向粗化规律的影响。结果表明,施加压应力可改变立方γ/γ'两相的应力分布,γ'相的定向粗化取向与γ基体通道的Von Mises应力分布密切相关,其中,在施加压应力作用下,立方γ'相的(001)晶面产生较大的Von Mises应力及应变能密度变化是使其发生组织演化的主要原因。并进一步提出压应力蠕变期间,合金中发生元素定向扩散和γ'相定向生长的驱动力。

关键词(KeyWords)： 单晶镍基合金;压应力蠕变;组织演化;有限元分析;驱动力

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(50571070)

作者(Author): 张姝,田素贵,梁福顺,黎阿男,李晶晶

DOI: 10.13289/j.issn.1009-6264.2011.06.028

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