Effect of sintering temperature on microstructure and properties of hot pressing sintered Ti-6Al-4V alloy

doi:10.13251/j.issn.0254-6051.2023.05.026

Abstract

Abstract: Ti-6Al-4V (TC4) alloy with excellent properties was prepared by hot pressing sintering at 800-1100 ℃ under 25 MPa and recrystallization annealing at 780 ℃ for 2 h. The phase structure of the tested alloy and its evolution with temperature were studied, and the effects of different hot pressing sintering temperatures on the sintering density, microstructure and mechanical properties were analyzed. The results show that the starting and finishing temperatures of α→β phase transformation of the prepared Ti-6Al-4V alloy are 627 ℃ and 941 ℃, respectively. The sintering densification cannot be achieved when sintering at 800 ℃. Uniform microstructure is obtained by sintering at 900 ℃, while sintering at 1000 ℃ and 1100 ℃ causes abnormal coarsening of the microstructure. By hot pressing sintering at 900 ℃+annealing, the tensile strength of the Ti-6Al-4V alloy reaches to 894.6 MPa, and the elongation after fracture reaches to 15.7%, the tested alloy obtains excellent strength and plasticity.

Key words: Ti-6Al-4V alloy, hot pressing sintering, sintering temperature, phase structure, mechanical properties

CLC Number:

TG146.2

Li Ji, Cao Zhen, Luo Ping, Xiao Zhitong, Li Jiongli, Wang Xudong. Effect of sintering temperature on microstructure and properties of hot pressing sintered Ti-6Al-4V alloy[J]. Heat Treatment of Metals, 2023, 48(5): 166-173.

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