Selective laser melting of CP–Ti to overcome the low cost and high performance 
trade-off

Tao, Qiying; Wang, Zhangwei; Chen, Gang; Cai, Wei; Cao, Peng; Zhang, Cong; Ding, Wangwang; Lu, Xin; Luo, Ting; Qu, Xuanhui; Qin, Mingli

doi:10.1016/j.addma.2020.101198

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Selective laser melting of CP–Ti to overcome the low cost and high performance trade-off

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Wang, Zhangwei
High-Entropy Alloys, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Luo, Ting
Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Tao, Q., Wang, Z., Chen, G., Cai, W., Cao, P., Zhang, C., et al. (2020). Selective laser melting of CP–Ti to overcome the low cost and high performance trade-off. Additive Manufacturing, 34: 101198. doi:10.1016/j.addma.2020.101198.

Cite as: https://hdl.handle.net/21.11116/0000-0009-6C29-1

Abstract

In this study, commercially pure titanium (CP-Ti) parts were successfully fabricated by selective laser melting (SLM) using cost-effective hydride-dehydride (HDH) Ti powders for the first time modified by jet milling. Jet milling effectively improves the particle-shape sphericity, suppresses the impurity pick-up, and produces localized plastic deformation. The flowability of the jet-milled powders is tremendously improved to 29.7 s/50 g that satisfies the SLM processing well, while the oxygen content only increases by 0.02 wt. (the raw oxygen level: 0.15 wt.). The oxide layer in the powder surface is determined with the thickness of ∼8 nm and TiO being the predominant phase before and after jet milling. The SLM-made (SLMed) CP-Ti achieves dominant martensitic α’ phase with the fracture tensile strength up to 731.5 ± 5.7 MPa and elongation of 20.5 ± 1.1, comparable with those using expensive atomized powders. Contrary to the conventional metallurgical mechanism for Ti which suffers the cost-performance dilemma, this work presents SLMed CP-Ti with excellent synergy of strength and ductility while using the cost-affordable HDH Ti powders. © 2020 Elsevier B.V.