李育升,宋珂阳,于凯,张麦仓

• 1:北京科技大学材料科学与工程学院

摘要(Abstract)：

采用冲击实验研究了不同温度固溶处理及固溶和双级时效处理对GH4151合金冲击性能的影响，采用光学显微镜、扫描电镜和透射电镜等观察了合金经不同工艺处理后的显微组织、析出相和断口形貌。结果表明：对于仅固溶处理的合金，当固溶温度低于1140℃时，其冲击韧性值的变化不大，固溶温度高于1140℃时，冲击韧性值随固溶温度的升高而增加，断裂过程以裂纹的稳定扩展区为主，断口呈韧性断裂。对于固溶时效处理的合金，当固溶温度低于1160℃时，冲击韧性值的变化也比较稳定，固溶温度高于1160℃时，冲击韧性值随固溶温度的升高而降低，断裂过程不存在裂纹的稳定扩展区，断口呈典型的沿晶脆性断裂。这主要是因为当固溶温度低于1140℃时，合金的晶粒尺寸变化不大，而在1140℃以上时晶粒尺寸明显增大；双级时效后，当固溶温度高于1160℃时，晶界上连续或不连续分布的第二相显著降低了合金的冲击韧性。

关键词(KeyWords)： GH4151合金;固溶温度;组织演化;冲击韧性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51971016)

作者(Author): 李育升,宋珂阳,于凯,张麦仓

DOI: 10.13289/j.issn.1009-6264.2022-0419

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