Additive manufacturing of a new titanium alloy with tunable microstructure and isotropic properties

doi:10.1016/j.addma.2024.104546

IMR OpenIR

	Additive manufacturing of a new titanium alloy with tunable microstructure and isotropic properties
	Chang, Jiaqiang 1,3; Ma, Yingjie 2; Huang, Sensen 2; Qi, Min 2; Zhai, Zirong 1; Wu, Yingna 1; Yang, Rui 1,2; Zhang, Zhenbo 1
通讯作者	Ma, Yingjie(yjma@imr.ac.cn) ; Zhang, Zhenbo(zhangzhb1@shanghaitech.edu.cn)
	2024-09-05
发表期刊	ADDITIVE MANUFACTURING
ISSN	2214-8604
卷号	95 页码:16
摘要	Conventional titanium alloys have a high propensity in developing columnar grains with strong textures during additive manufacturing (AM), which causes pronounced anisotropy in mechanical properties and hampers their practical applications. In this study, a new metastable (3 titanium alloy with high Fe addition (Ti-3Al-6Fe-6V-2Zr, wt%) was designed for AM, and the strategies and underlying mechanisms to eliminating the structural heterogeneity including grain morphology, Fe element segregation and phase constituent distribution were elaborately investigated. It was demonstrated that the alloy has an outstanding intrinsic capability of forming equiaxed grains during direct energy deposition (DED) due to the positive effect of Fe on constitutional supercooling. The final microstructure of bulk sample was determined by the directly deposited microstructure and subsequent microstructure coarsening caused by cyclic heating, and homogeneously equiaxed microstructure without texture could be achieved when the heat-affected zones can fully cover the formerly deposited layer. Despite of very high level of Fe addition, both microscale and macroscale Fe segregation were completely suppressed during DED, by taking the advantages of fast solidification rate and tailoring the heating effect between the adjacent layers. Moreover, the problem related to the heterogeneity in alpha phase distribution along the building direction was solved by mitigating the heat accumulation during DED. On the basis of these understandings, homogeneously equiaxed Ti3662 alloy with isotropic mechanical properties of high strength (similar to 1200 MPa) and decent ductility (similar to 10 %) was finally fabricated by DED, which stands a good chance for practical application. This study demonstrates that the special metallurgical process during AM largely expands the design space of titanium alloys on the aspects of composition and microstructure, which can be utilized to fabricate titanium alloys with desirable microstructure and excellent properties.
关键词	Titanium alloy Additive manufacturing Texture Equiaxed Isotropic property
资助者	National Key R & D Program of China ; ShanghaiTech University Startup Fund ; Centre for High resolution Electron Microscopy (ChEM) , SPST, ShanghaiTech University
DOI	10.1016/j.addma.2024.104546
收录类别	SCI
语种	英语
资助项目	National Key R & D Program of China[2021YFC2801802] ; ShanghaiTech University Startup Fund ; Centre for High resolution Electron Microscopy (ChEM) , SPST, ShanghaiTech University[EM02161943]
WOS研究方向	Engineering ; Materials Science
WOS类目	Engineering, Manufacturing ; Materials Science, Multidisciplinary
WOS记录号	WOS:001358166500001
出版者	ELSEVIER
引用统计	被引频次：2[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/321006/191675
专题	中国科学院金属研究所
通讯作者	Ma, Yingjie; Zhang, Zhenbo
作者单位	1.ShanghaiTech Univ, Ctr Adapt Syst Engn, Shanghai 201210, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 3.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China
推荐引用方式 GB/T 7714	Chang, Jiaqiang,Ma, Yingjie,Huang, Sensen,et al. Additive manufacturing of a new titanium alloy with tunable microstructure and isotropic properties[J]. ADDITIVE MANUFACTURING,2024,95:16.
APA	Chang, Jiaqiang.,Ma, Yingjie.,Huang, Sensen.,Qi, Min.,Zhai, Zirong.,...&Zhang, Zhenbo.(2024).Additive manufacturing of a new titanium alloy with tunable microstructure and isotropic properties.ADDITIVE MANUFACTURING,95,16.
MLA	Chang, Jiaqiang,et al."Additive manufacturing of a new titanium alloy with tunable microstructure and isotropic properties".ADDITIVE MANUFACTURING 95(2024):16.