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

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

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

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.

Original languageEnglish
Article number101198
JournalAdditive Manufacturing
Volume34
DOIs
Publication statusPublished - 2020 Aug
Externally publishedYes

Keywords

  • Jet milling
  • Low cost
  • Powder modification
  • Selective laser melting
  • Titanium

ASJC Scopus subject areas

  • Biomedical Engineering
  • Materials Science(all)
  • Engineering (miscellaneous)
  • Industrial and Manufacturing Engineering

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