Enhancing the mechanical property of laser powder bed fusion CoCrMo alloy by tailoring the microstructure and phase constituent
文献类型：期刊论文
| 作者 | Zhang, Yu1; Lin, Wenhu1; Zhai, Zirong1; Wu, Yingna1; Yang, Rui1,2; Zhang, Zhenbo1 |
| 刊名 | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
 |
| 出版日期 | 2023-01-18 |
| 卷号 | 862页码:14 |
| 关键词 | CoCrMo alloy Laser powder bed fusion Cellular structure Mechanical property Phase constituent |
| ISSN号 | 0921-5093 |
| DOI | 10.1016/j.msea.2022.144449 |
| 通讯作者 | Zhang, Zhenbo(zhangzhb1@shanghaitech.edu.cn) |
| 英文摘要 | Cellular structure with a high density of dislocations and elemental segregation at the cell boundaries is the characteristic microstructure of the laser powder bed fusion (LPBF) CoCrMo alloy. This structure is known to be merit to the alloy's strength, but this structure and elemental heterogeneity are likely to be detrimental to the ductility. In this study, the effect of solution treatment and aging on the microstructure, phase fraction, and mechanical behaviors of a CoCrMo alloy fabricated by laser powder bed fusion (LPBF) was investigated, in order to achieve a microstructure state with excellent synergy in strength and ductility. The results showed that solution treatment at 1150 degrees C for 1 h was sufficient to remove the cellular structure and eliminated the elemental segregation, but it resulted in a dramatic reduction in yield strength. Direct aging at 750 degrees C for 2 h led to a boost in the yield strength due to the precipitation of Cr-rich carbides, but the alloy ductility was significantly reduced and the elemental segregation was maintained. An excellent combination of strength and ductility was achieved via a two-step solution and aging treatment, by which both the strength and ductility were improved compared to that of the as-built CoCrMo alloy. Multiscale characterizations demonstrated that the synergetic strength and ductility were mainly attributed to the strengthening effect of the epsilon phase formed during aging and stress-induced gamma to epsilon phase transformation under mechanical loading. In addition, the enhanced ductility was also evidently benefited from the eliminated cellular structure and elemental segregation, which reduces the tendency in crack nucleation. |
| 资助项目 | National Natural Science Foundation of China[52001212] ; ShanghaiTech University Startup fund ; Shanghai Sailing Program[21YF1428800] ; Shanghai Municipal Education Commission and Shanghai Education Development Foundation |
| WOS研究方向 | Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000917936000001 |
| 出版者 | ELSEVIER SCIENCE SA |
| 资助机构 | National Natural Science Foundation of China ; ShanghaiTech University Startup fund ; Shanghai Sailing Program ; Shanghai Municipal Education Commission and Shanghai Education Development Foundation |
| 源URL | [http://ir.imr.ac.cn/handle/321006/175248]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Zhang, Zhenbo |
| 作者单位 | 1.ShanghaiTech Univ, Ctr Adapt Syst Engn, Sch Creat & Art, Shanghai 201210, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Yu,Lin, Wenhu,Zhai, Zirong,et al. Enhancing the mechanical property of laser powder bed fusion CoCrMo alloy by tailoring the microstructure and phase constituent[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2023,862:14. |
| APA | Zhang, Yu,Lin, Wenhu,Zhai, Zirong,Wu, Yingna,Yang, Rui,&Zhang, Zhenbo.(2023).Enhancing the mechanical property of laser powder bed fusion CoCrMo alloy by tailoring the microstructure and phase constituent.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,862,14. |
| MLA | Zhang, Yu,et al."Enhancing the mechanical property of laser powder bed fusion CoCrMo alloy by tailoring the microstructure and phase constituent".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 862(2023):14. |
入库方式： OAI收割
来源：金属研究所
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