Formation Mechanisms of Hot Cracks in Laser Additive Repairing Single Crystal Superalloys
文献类型：期刊论文
| 作者 | Lu, Nannan3; Guo, Yimo2,3; Yang, Shulin1; Liang, Jingjing3; Zhou, Yizhou3; Sun, Xiaofeng3; Li, Jinguo3 |
| 刊名 | ACTA METALLURGICA SINICA
 |
| 出版日期 | 2023-09-11 |
| 卷号 | 59期号:9页码:1243-1252 |
| 关键词 | single crystal superalloy hot crack additive manufacturing microstructure liquid film stability |
| ISSN号 | 0412-1961 |
| DOI | 10.11900/0412.1961.2023.00147 |
| 通讯作者 | Li, Jinguo(jgli@imr.ac.cn) |
| 英文摘要 | Hot cracking is a prevalent defect in metallurgy that often occurs during the laser additive repair of single crystal superalloys. The understanding of the cracking mechanism is vital for defect prevention. Consequently, this study entails combining experimental analysis and theoretical calculations to investigate the hot cracking mechanism in a second-generation single crystal superalloy, DD432, during laser additive repairing. The incident of hot cracking was observed predominantly at high-angle grain boundaries (HAGBs). High-magnitude stress concentrations were identified on both sides of the crack, accompanied by an extensive distribution of MC-type carbides in the crack initiation region. Hot cracking depended on factors such as liquid film stability, stress concentration, and MC-type carbide precipitates. The stability of the liquid film depended on dendrite coalescence undercooling, which in turn was related to the angle of grain boundaries. According to Rappaz's theory of dendrite coalescence undercooling, the calculated dendrite coalescence undercooling at HAGBs was 395 K. This figure was substantially higher than the 38 K liquid film undercooling found within a single dendrite, and far exceeded the undercooling at a low-angle grain boundary (3.6 degrees) with a value of 56 K. The elevated level of stress concentration served as a driving force for crack initiation and propagation. MC-type carbide precipitates promoted crack initiation through a pinning effect on the liquid feed, thereby weakening the interface bonding strength with the substrate. |
| 资助项目 | National Key Research and Development Program of China[2021YFB3702503] ; China Post-doctoral Science Foundation[2022M723211] |
| WOS研究方向 | Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001059082200013 |
| 出版者 | SCIENCE PRESS |
| 资助机构 | National Key Research and Development Program of China ; China Post-doctoral Science Foundation |
| 源URL | [http://ir.imr.ac.cn/handle/321006/179335]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Li, Jinguo |
| 作者单位 | 1.AECC Shenyang Liming Aero Engine Co Ltd, Shenyang 110043, Peoples R China 2.Shenyang Univ Technol, Sch Mat Sci & Engn, Shenyang 110870, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shichangxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lu, Nannan,Guo, Yimo,Yang, Shulin,et al. Formation Mechanisms of Hot Cracks in Laser Additive Repairing Single Crystal Superalloys[J]. ACTA METALLURGICA SINICA,2023,59(9):1243-1252. |
| APA | Lu, Nannan.,Guo, Yimo.,Yang, Shulin.,Liang, Jingjing.,Zhou, Yizhou.,...&Li, Jinguo.(2023).Formation Mechanisms of Hot Cracks in Laser Additive Repairing Single Crystal Superalloys.ACTA METALLURGICA SINICA,59(9),1243-1252. |
| MLA | Lu, Nannan,et al."Formation Mechanisms of Hot Cracks in Laser Additive Repairing Single Crystal Superalloys".ACTA METALLURGICA SINICA 59.9(2023):1243-1252. |
入库方式： OAI收割
来源：金属研究所
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