The cracking behavior of Ni superalloys fabricated by laser directed energy deposition: The spatial distribution and formation mechanism
文献类型：期刊论文
| 作者 | Yang, Xingming1; Liu, Miao2; Yu, Hao1; Liu, Zhongqiu2; Li, Jinguo3; Xu, Wei1 |
| 刊名 | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
 |
| 出版日期 | 2025-02-01 |
| 卷号 | 924页码:11 |
| 关键词 | Additive manufacturing Ni superalloy Crack distribution Microstructure |
| ISSN号 | 0921-5093 |
| DOI | 10.1016/j.msea.2025.147862 |
| 通讯作者 | Yu, Hao(yuhao@ral.neu.edu.cn) |
| 英文摘要 | Cracking defects forming during additive manufacturing (AM) process in Ni superalloys have posed great challenge in application, since the spatial distributions of AM cracks are generally complex and lack regularity. In this work, investigations on the mechanisms governing the spatial distribution of cracks have been conducted based on a self-developed Ni superalloy AMS-nDB (Additive Manufacturable Superalloys with no Distribution of boron). The microstructural features including grain size, grain boundary misorientation, precipitates, and primary dendrite arm spacing (PDAS) distribution of have been characterized and simulated systematically. The AM cracks in as-printed samples are observed to locate exclusively in the bottom region in vicinity of the substrate. By excluding the possible effect of residual stress, grain size and grain boundary misorientation, the formation of unevenly distributed cracks in the alloy has been attributed to the heterogeneous precipitation behaviors. More specifically, detrimental Cr2B borides precipitate in the bottom region of the samples along the crack path, leading to the hot-tear cracking. The formation of borides is due to the different elemental segregation behaviors along the building direction, originating from the variations in the temperature gradient. Based on the unveiled cracking mechanism, the printing strategy has been optimized accordingly, which manage to manipulate the precipitation behaviors and effectively eliminate the cracking. The findings provide guidance for microstructure optimization and cracking suppression in AM-ed Ni superalloys. |
| 资助项目 | National Key Research and Development Program[2021YFB3702502] ; National Natural Science Foundation of China[52204383] |
| WOS研究方向 | Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001402932700001 |
| 出版者 | ELSEVIER SCIENCE SA |
| 资助机构 | National Key Research and Development Program ; National Natural Science Foundation of China |
| 源URL |  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Yu, Hao |
| 作者单位 | 1.Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110819, Peoples R China 2.Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Xingming,Liu, Miao,Yu, Hao,et al. The cracking behavior of Ni superalloys fabricated by laser directed energy deposition: The spatial distribution and formation mechanism[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2025,924:11. |
| APA | Yang, Xingming,Liu, Miao,Yu, Hao,Liu, Zhongqiu,Li, Jinguo,&Xu, Wei.(2025).The cracking behavior of Ni superalloys fabricated by laser directed energy deposition: The spatial distribution and formation mechanism.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,924,11. |
| MLA | Yang, Xingming,et al."The cracking behavior of Ni superalloys fabricated by laser directed energy deposition: The spatial distribution and formation mechanism".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 924(2025):11. |
入库方式： OAI收割
来源：金属研究所
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