Enhancing the mechanical property of laser powder bed fusion CoCrMo alloy by tailoring the microstructure and phase constituent

doi:10.1016/j.msea.2022.144449

IMR OpenIR

	Enhancing the mechanical property of laser powder bed fusion CoCrMo alloy by tailoring the microstructure and phase constituent
	Zhang, Yu 1; Lin, Wenhu 1; Zhai, Zirong 1; Wu, Yingna 1; Yang, Rui 1,2; Zhang, Zhenbo 1
通讯作者	Zhang, Zhenbo(zhangzhb1@shanghaitech.edu.cn)
	2023-01-18
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	862 页码:14
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.
关键词	CoCrMo alloy Laser powder bed fusion Cellular structure Mechanical property Phase constituent
资助者	National Natural Science Foundation of China ; ShanghaiTech University Startup fund ; Shanghai Sailing Program ; Shanghai Municipal Education Commission and Shanghai Education Development Foundation
DOI	10.1016/j.msea.2022.144449
收录类别	SCI
语种	英语
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
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000917936000001
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：15[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/175249
专题	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.