新型钴基高温合金中W元素对蠕变组织和性能的影响
收稿日期: 2023-03-23
修回日期: 2023-05-06
网络出版日期: 2023-06-25
基金资助
国家自然科学基金项目(51971174);国家自然科学基金项目(52031012);国家科技重大专项项目(J2019-VI-0020-0135);国家重点研发计划项目(2017YFB0702902);西北工业大学凝固技术国家重点实验室项目(2022-TZ-01)
Effects of W Concentration on Creep Microstructure and Property of Novel Co-Based Superalloys
Received date: 2023-03-23
Revised date: 2023-05-06
Online published: 2023-06-25
Supported by
National Natural Science Foundation of China(51971174);National Natural Science Foundation of China(52031012);National Science and Technology Major Project(J2019-VI-0020-0135);National Key Research and Development Program of China(2017YFB0702902);Research Fund of the State Key Laboratory of Solidification Processing (NPU), China(2022-TZ-01)
陈佳 , 郭敏 , 杨敏 , 刘林 , 张军 . 新型钴基高温合金中W元素对蠕变组织和性能的影响[J]. 金属学报, 2023 , 59(9) : 1209 -1220 . DOI: 10.11900/0412.1961.2023.00118
γ' precipitate strengthened cobalt-based alloys exhibit superior comprehensive properties and are potential candidates for the anticipated next-generation superalloy. The phase field method, which considers the combined effect of multiple energy fields, effectively elucidates the processing and mechanism of microstructure evolution. By using the ternary elastoplastic phase field model coupled with CALPHAD and crystal plasticity model, the γ' evolution of Co-9Al-xW (x = 8, 9, and 10; atomic fraction, %) alloys during creep processes is simulated herein. The corresponding rafting behaviors and creep properties are evaluated from the perspective of the changes in second-order moment invariant map (SOMIM) and stress/strain fields. The results show that as the W content increases, the volume fraction of the γ' phase increases, the plastic strain in the γ matrix reduces, and rafting occurs with accelerated rate, which enhances the creep property. Further, the SOMIM analysis shows that the raft structure leads to a steady creep behavior in 9W and 10W alloys. In addition, the alloy with a high W content has a high misfit stress in the γ matrix, which leads to a low plastic strain.
Key words： Co-based superalloy; phase field simulation; creep; rafting
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