ausblenden:
Schlagwörter:
Cost effectiveness; Economic and social effects; Melting; Milling (machining); Oxygen; Powders; Selective laser melting; Tensile strength; Titanium metallography, Commercially Pure titaniums; Hydridedehydride (HDH); Jet milled powder; Localized plastic deformation; Metallurgical mechanisms; Performance trade-off; Selective laser melting (SLM); Strength and ductilities, Costs
Zusammenfassung:
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.
