Rolling, microstructure and properties of Ti-6Al-4V alloy

doi:10.13251/j.issn.0254-6051.2020.01.043

Abstract

Abstract: Effects of two-way rolling and one-way rolling on the microstructure and mechanical properties of Ti-6Al-4V alloys in different original states (hot-rolled, water-quenched and air-cooled) were studied by means of OM, TEM and tensile test. The results show that the microstructure of hot-rolled Ti-6Al-4V alloy is composed of flake-like α phase, β phase and a small amount of equiaxed α phase. The needle-like martensite is formed in water-quenched Ti-6Al-4V alloy and the net basket structure is formed in air-cooled Ti-6Al-4V alloy. The optimum two-way rolling temperature for Ti-6Al-4V alloy is 700 ℃, at which the granular β phase is dispersed on the matrix α. The order of tensile strength and yield strength of two-way rolling Ti-6Al-4V alloy from high to low is WQ>M>AC, and the strength in the rolling direction is higher than that in the transverse. Compared with unidirectional rolling, two-way rolling significantly reduces the anisotropy of tensile properties of Ti-6Al-4V alloy sheet, and the difference between the rolling and transverse strength of water-quenched Ti-6Al-4V alloy is the smallest, and the main refining mechanism of rolling Ti-6Al-4V alloy at 700 ℃ is the dislocation refine.

Key words: Ti-6Al-4V alloy, two-way rolling, one-way rolling, microstructure, mechanical properties

CLC Number:

TG146

Zhu Xia, Dong Junhui, Luo Zhifeng. Rolling, microstructure and properties of Ti-6Al-4V alloy[J]. HTM, 2020, 45(1): 222-227.

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