Research on the Processing Optimization, Microstructure, and Properties of Ti60 Alloy Fabricated via Laser Powder Bed Fusion
Author of the article: ZHOUFan1,2, WU Fan1,2, FENG Zhe1,2, WANG Yongxia1,2, PENG Yijie1,2, DANG Mingji1,2, ZHANGZhe1,2, TAN Hua1,2, ZHANG Fengying3, LIN Xin1,2
Author's Workplace：1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China; 2. MIIT Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, Northwestern Polytechnical University, Xi'an 710072, China; 3. School of Materials Science and Engineering, Chang'an University, Xi'an 710064, China
Key Words：laser powder bed fusion; Ti60 alloy; processing optimization; microstructure; mechanical properties
Abstract：
Ti60 alloys have a high specific strength and can be in service at 600 ℃ for a long time. The preparation of
Ti60 alloys by laser powder bed fusion (LPBF) is expected to meet the needs of high-temperature resistance and the light
weight of key components in aerospace. The influence of the basic processing parameters on the microstructure and
microhardness of the Ti60 alloy was systematically studied, and the tensile properties of the Ti60 alloy at room temperature
and high temperature were evaluated. The results show that the laser powder bed fusion processing parameters have
obvious effects on the density, microstructure and microhardness of the Ti60 alloy. The microstructure of the Ti60 alloy in
the deposition state is mainly fine acicular α′ martensite, and the average thickness is negatively correlated with the
volumetric energy density. At room temperature, the yield strength of the Ti60 alloy is 1 164 MPa, the ultimate tensile
strength is 1 321 MPa, and the elongation is 2.5%. At 600 ℃, the yield strength is 532 MPa, the ultimate tensile strength is
889 MPa, and the elongation is 16%.
