张雪煜,刘丽荣,赵云松,张剑

• 1:沈阳工业大学材料科学与工程学院
• 2:中国航发北京航空材料研究院先进高温结构材料重点研究所

摘要(Abstract)：

利用扫描电镜、Image Pro Plus软件和Nano Measurer软件研究了微孔在铸态、固溶处理态和完全热处理态的一种三代镍基单晶高温合金中的形貌及尺寸，采用蠕变试验机研究了微孔在合金持久试验过程中的演化。结果表明：铸态合金枝晶间区域γ/γ′共晶边缘存在少量的不规则形状的微孔，微孔的体积分数约为0.09%,平均尺寸约为9.54μm;经固溶处理后合金中会产生圆形和方形的固溶微孔，固溶处理(1325℃)时间由4 h延长到8 h,固溶微孔的体积分数由0.42%增加到0.46%,增加了约10%。时效处理对固溶微孔的体积分数没有明显影响。固溶微孔会在合金持久过程中发展为裂纹源，最终导致持久断裂，方形微孔更易发展成裂纹。

关键词(KeyWords)： 镍基单晶高温合金;微孔;固溶处理;持久试验

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52001297)

作者(Author): 张雪煜,刘丽荣,赵云松,张剑

DOI: 10.13289/j.issn.1009-6264.2023-0499

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