Effect of vacuum annealing on microstructure and mechanical properties of selective laser melted TA2 pure titanium

doi:10.13251/j.issn.0254-6051.2022.05.025

Abstract

Abstract: The medical TA2 pure titanium specimens were prepared by the selective laser melting process. Effect of vacuum annealing on microstructure and mechanical properties of the specimens was been compared and analyzed by means of optical microscope (OM), scanning electron microscope (SEM), universal material experiment machine and Vickers hardness tester. The change of oxygen content in the specimens were also studied by means of combined determination apparatus for oxygen, nitrogen and hydrogen. The results show that appropriate vacuum heat treatment process can obviously change the microstructure of specimens from martensite structure to near-equiaxial structure, and effectively change the mechanical properties of the specimens, reduce the tensile strength and yield strength, and increase the plasticity. In addition, vacuum heat treatment could reduce the oxygen content and hardness. When annealed in vacuum at 800 ℃ for 1 h, the microstructure of specimens is the near-equiaxial structure,and the mechanical properties are satisfied with the requirement of the GB/T 13810—2017 Wrought titanium and titanium alloy for surgical implants,and the R_m, R_p0.2, A and Z are 670.3 MPa, 609 MPa, 20% and 44.7%, respectively.

Key words: selective laser melting, TA2 pure titanium, vacuum heat treatment, microstructure, mechanical properties

CLC Number:

TG166.5

Zhang Chunyu, Yan Yu, Chen Xianshuai, Du Ruxu. Effect of vacuum annealing on microstructure and mechanical properties of selective laser melted TA2 pure titanium[J]. Heat Treatment of Metals, 2022, 47(5): 155-160.

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