Stress-induced influence on the evolution of γ′ phase in dendritic area during long-term stress aging at 900 °C in Ni-based superalloy K444
文献类型：期刊论文
| 作者 | Cai, Hang1,2; Hou, Jieshan1; Xing, Jing1,2; Yang, Fenqi3; Liu, Zitong3; Zhou, Lan-Zhang1 |
| 刊名 | MATERIALS CHARACTERIZATION
 |
| 出版日期 | 2024 |
| 卷号 | 207页码:10 |
| 关键词 | Ni-based superalloy Long-term stress aging Microstructure evolution TCP phase Threshold stress |
| ISSN号 | 1044-5803 |
| DOI | 10.1016/j.matchar.2023.113549 |
| 通讯作者 | Hou, Jieshan(jshou@imr.ac.cn) ; Zhou, Lan-Zhang(lzz@imr.ac.cn) |
| 英文摘要 | The evolution of gamma ' phase in the Ni-based superalloy K444 alloy is investigated after long-term aging for 5000 h (LTA5,000) at 900 degrees C under different stresses (0 MPa, 50 MPa, 65 MPa, 80 MPa, 100 MPa and 120 MPa). The role of applied stress in the LTA5,000 process is analyzed in detail from multiple aspects, including morphology, composition partition, the formation of TCP phase, lattice misfit (delta) and dislocations configuration. The results reveal that the stress promotes the gamma ' phase directional coarsening when it exceeds the critical value. For this alloy, the rafting structure is obvious when the stress is higher than 80 MPa, while gamma ' phases maintain cuboid shape when the stress is below 65 MPa. It is caused by the stress gradient in the gamma channels which accelerates the gamma ' forming elements diffuse from horizontal gamma channels to the vertical channels and only sufficient stress can activate the directional diffusion behavior. Besides, the stress induces that Al and Ti strongly assign to gamma ' phases and the concentration of Cr in gamma matrix increases clearly. In addition, the sigma-TCP is free until the applied stress raises to 120 MPa, it is attributed to the increase in Cr concentration in the gamma matrix. Moreover, the value of vertical bar delta vertical bar increases as the applied stress increases, and reducing interfacial energy becomes the driving force for directional coarsening. Finally, the calculated results based on the threshold stress demonstrate that the dislocations climb over the gamma ' particles within the range of 65 MPa similar to 120 MPa, which is in agreement with the observed phenomena. |
| 资助项目 | National Science and Technology Major Project[Y2019-VII-001 1-0151] ; National Natural Science Foundation of China (NSFC)[51571191] |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001156550800001 |
| 出版者 | ELSEVIER SCIENCE INC |
| 资助机构 | National Science and Technology Major Project ; National Natural Science Foundation of China (NSFC) |
| 源URL |  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Hou, Jieshan; Zhou, Lan-Zhang |
| 作者单位 | 1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China 3.Shenyang Ligong Univ, Coll Mat Sci & Engn, Shenyang 110016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Cai, Hang,Hou, Jieshan,Xing, Jing,et al. Stress-induced influence on the evolution of γ′ phase in dendritic area during long-term stress aging at 900 °C in Ni-based superalloy K444[J]. MATERIALS CHARACTERIZATION,2024,207:10. |
| APA | Cai, Hang,Hou, Jieshan,Xing, Jing,Yang, Fenqi,Liu, Zitong,&Zhou, Lan-Zhang.(2024).Stress-induced influence on the evolution of γ′ phase in dendritic area during long-term stress aging at 900 °C in Ni-based superalloy K444.MATERIALS CHARACTERIZATION,207,10. |
| MLA | Cai, Hang,et al."Stress-induced influence on the evolution of γ′ phase in dendritic area during long-term stress aging at 900 °C in Ni-based superalloy K444".MATERIALS CHARACTERIZATION 207(2024):10. |
入库方式： OAI收割
来源：金属研究所
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