| Investigating the evolution of freckles into sliver defects in Ni-based single-crystal superalloy castings | |
| Han, Dongyu1,2; Jiang, Weiguo3; Xiao, Jiuhan1,2; Li, Kaiwen1,4; Lu, Yuzhang1; Lou, Langhong1 | |
| Corresponding Author | Jiang, Weiguo(jwg@wfust.edu.cn) |
| 2021-06-01 | |
| Source Publication | MATERIALS TODAY COMMUNICATIONS
 |
| Volume | 27Pages:14 |
| Abstract | Freckles are detrimental solidification defects in Ni-based single-crystal superalloy castings that are formed during directional solidification. However, the evolution of freckles into sliver defects has rarely been reported, and the mechanism of this evolution is unclear. In this study, the evolution of freckles into slivers in the extended zone of casting was established to be the deformation of dendrites induced by the thermal contraction stress in the freckle channel. The morphology of the mushy zone was simulated using ProCAST, which indicated that freckles were formed at the highest position of the mushy zone. During the initiation of the slivers, deformation occurred at the freckle channel, indicating that the thermal contraction stress was a result of the solidification shrinkage of solute-rich liquid. The misorientation from the initial freckle grains to the slivers ranged from 15 degrees to 57 degrees. In addition, the orientation and ability of dendrite branching are crucial for the extension of the sliver dendrites. |
| Keyword | Ni-based superalloys Directional solidification Freckle evolution Slivers |
| Funding Organization | National Natural Science Foundation of China ; National Science and Technology Major Project of China ; National Key Research and Development Program of China |
| DOI | 10.1016/j.mtcomm.2021.102350 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[51674235] ; National Science and Technology Major Project of China[2017VI-0001-0070] ; National Key Research and Development Program of China[2017YFB0702904] |
| WOS Research Area | Materials Science |
| WOS Subject | Materials Science, Multidisciplinary |
| WOS ID | WOS:000683031100001 |
| Publisher | ELSEVIER |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/159510 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Jiang, Weiguo |
| Affiliation | 1.Chinese Acad Sci, Inst Met Res, Shichangxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.Weifang Univ Sci & Technol, Shouguang 262700, Shandong, Peoples R China 4.Shenyang Univ Technol, Sch Mat Sci & Engn, Shenyang 110870, Peoples R China |
| Recommended Citation GB/T 7714 | Han, Dongyu,Jiang, Weiguo,Xiao, Jiuhan,et al. Investigating the evolution of freckles into sliver defects in Ni-based single-crystal superalloy castings[J]. MATERIALS TODAY COMMUNICATIONS,2021,27:14. |
| APA | Han, Dongyu,Jiang, Weiguo,Xiao, Jiuhan,Li, Kaiwen,Lu, Yuzhang,&Lou, Langhong.(2021).Investigating the evolution of freckles into sliver defects in Ni-based single-crystal superalloy castings.MATERIALS TODAY COMMUNICATIONS,27,14. |
| MLA | Han, Dongyu,et al."Investigating the evolution of freckles into sliver defects in Ni-based single-crystal superalloy castings".MATERIALS TODAY COMMUNICATIONS 27(2021):14. |
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