Transformation-induced plasticity and high strength in beta titanium alloy manufactured by selective laser melting

Document Type

Journal Article

Publication Title

Materialia

Publisher

Elsevier BV

School

School of Engineering

RAS ID

28487

Comments

Liu, Y. J., Zhang, Y. S., & Zhang, L. C. (2019). Transformation-induced plasticity and high strength in beta titanium alloy manufactured by selective laser melting. Materialia, 6. Available here

Abstract

This work reports simultaneous achievement of high strength and large tensile ductility in a beta titanium alloy manufactured by selective laser melting (SLM). The SLM-produced samples present a unique microstructure and great mechanical behavior due to fast cooling in SLM process. Simultaneous improvement in yield strength (∼592±21 MPa), ultimate tensile strength (716±14 MPa) and ductility (37±5%) of SLM-produced sample results from the combination of fine columnar grains and sub-grains, strong texture and the transformation-induced plasticity (TRIP) and “hard-wraps-soft” effects. The large amount of sub-grain boundaries and strong texture delay the initiation of martensitic transformation in the SLM-produced sample, thereby increasing its yield strength. © 2019

DOI

10.1016/j.mtla.2019.100299

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