Application Performance Research of TC4 by Selective Laser Melting

Author of the article:HE Kun, HAO Ju, CHEN Suming, ZHAO Qinghui

Author's Workplace：Avic Xi'an Aircraft Industry Group Company Ltd., Xi'an 710089, China

Key Words：selected laser melting; TC4; fatigue; application performance

Abstract：In this paper, a selected laser melting (SLM) process was used to prepare TC4 titanium alloy standard samples and typical parts. Through different heat treatment process tests, the metallographic structure and conventional mechanical properties of the material were analyzed, and the optimal heat treatment process was finally obtained. 800 ℃ is determined to be the optimal annealing temperature, taking into account the microstructure uniformity of the material and the mechanical properties. In addition, the high-cycle fatigue S-N curve was tested to conduct a comprehensive performance evaluation of the mechanical properties of the parts. The fatigue limit σR of TC4 in the environment of 107 high-cycle fatigue cycles is 350 MPa, showing stable fatigue strength. Finally, through the ground function test assessment of typical parts, the key application performance parameters of SLM-formed TC4 parts are obtained, which provides a basis for the application of TC4 metal 3D printed parts.