Developing ductile and isotropic Ti alloy with tailored composition for laser powder bed fusion

Wang, Leyun; Song, Zhe; Zhang, Xuan; Park, Jun-Sang; Almer, Jonathan; Zhu, Gaoming; Chen, Yiwen; Li, Quan; Zeng, Xiaoqin; Li, Yanjun

doi:10.1016/j.addma.2022.102656

Title: Developing ductile and isotropic Ti alloy with tailored composition for laser powder bed fusion

Journal Article · 01 February 2022 · Additive Manufacturing

DOI: https://doi.org/10.1016/j.addma.2022.102656 · OSTI ID:1896788

Wang, Leyun ^[1]; Song, Zhe ^[1]; Zhang, Xuan ^[2]; Park, Jun-Sang ^[3]; Almer, Jonathan ^[3]; Zhu, Gaoming ^[1]; Chen, Yiwen ^[1]; Li, Quan ^[1]; Zeng, Xiaoqin ^[1]; Li, Yanjun ^[4]

Shanghai Jiao Tong University (China)
Argonne National Laboratory (ANL), Argonne, IL (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Norwegian University of Science and Technology, Trondheim (Norway)

Laser powder bed fusion (LPBF) is an advanced technology to create metallic components with complex geometry. Ti-6Al-4V (Ti64) is one of the most frequently used materials for LPBF. The intrinsic high cooling rates and ultra-high directional thermal gradient of melt, however, lead to a hierarchical structure composed of fine martensitic alpha' within columnar prior-beta grains in LPBF Ti64. This microstructure results in poor ductility and strong mechanical anisotropy in as-built Ti64 components, which largely limit their applications. Here, we report that the above shortcomings can be overcome by tailoring the alloy composition. Specifically, by reducing the aluminum content from 6 wt% to 4 wt%, the resultant LPBF Ti-4Al-4V (Ti44) alloy exhibits substantially improved ductility and mechanical isotropy. These improvements are attributed to grain refinement during solidification and the activation of multiple slip modes and twinning in the as-built material during deformation. This work offers a simple strategy to design new titanium alloys for LPBF with significantly improved ductility and isotropy.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1896788

Journal Information:: Additive Manufacturing, Journal Name: Additive Manufacturing Vol. 52; ISSN 2214-8604

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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