两种高代次镍基单晶高温合金热机械疲劳中的再结晶行为
收稿日期: 2023-04-18
修回日期: 2023-05-20
网络出版日期: 2023-06-30
基金资助
国家自然科学基金项目(91960202);国家自然科学基金项目(52171020);国家自然科学基金项目(51901229);国家自然科学基金项目(51911530154);国家自然科学基金项目(91860201);国家自然科学基金项目(52271042);国家科技重大专项项目(P2022-C-IV-001-001)
Recrystallization During Thermo-Mechanical Fatigue of Two High-Generation Ni-Based Single Crystal Superalloys
Received date: 2023-04-18
Revised date: 2023-05-20
Online published: 2023-06-30
Supported by
National Natural Science Foundation of China(91960202);National Natural Science Foundation of China(52171020);National Natural Science Foundation of China(51901229);National Natural Science Foundation of China(51911530154);National Natural Science Foundation of China(91860201);National Natural Science Foundation of China(52271042);National Science and Technology Major Project(P2022-C-IV-001-001)
赵鹏 , 谢光 , 段慧超 , 张健 , 杜奎 . 两种高代次镍基单晶高温合金热机械疲劳中的再结晶行为[J]. 金属学报, 2023 , 59(9) : 1221 -1229 . DOI: 10.11900/0412.1961.2023.00173
Ni-based single crystal superalloys are widely used for turbine engine blades because of their excellent high-temperature mechanical properties. Thermo-mechanical fatigue (TMF) is a complex deformation process that combines strain and temperature effects. This process is also considered as a deformation method related to the working conditions of aviation turbine blades. Therefore, understanding the deformation mechanism of materials undergoing TMF is important for extending the service life of aviation turbine blades. Here, third-generation and fourth-generation single crystal superalloys that experienced TMF deformation are investigated by SEM and TEM, including aberration-corrected STEM. The results show the formation of deformation twins on different {111} planes of the single crystal superalloys. In addition, a large number of recrystallized grains are found in parallel twin lamellae or around the intersection of twin lamellae. The grain boundary of recrystallized grains is primarily composed of twin boundaries, low-angle grain boundaries, and large-angle grain boundaries generated by twin intersections. Furthermore, the twinning boundaries after deformation are analyzed using aberration-corrected TEM. Consequently, the process of twinning-induced dynamic recrystallization is comprehensively understood, which improved the TMF fracture mechanism of single crystal high-temperature alloys. These results improve the understanding of the deformation mechanism of single crystal superalloys under service conditions.
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