Effect of heat treatment process on microstructure and tensile properties of metastable β-type titanium alloy

doi:10.13251/j.issn.0254-6051.2023.07.032

Abstract

Abstract: A new type of Ti-Al-Mo-V-Cr-Fe metastable β-type titanium alloy was heat treated with different processes, and then the tensile properties at room temperature were tested. The microstructure and phase composition of the alloy under different heat treatment processes were analyzed by means of scanning electron microscopse (SEM) and X-ray diffractometer (XRD). The results show that when single annealing at 750 ℃ in the α + β two-phase temperature region, the alloy contains a large number of equiaxed α phases; when single annealing at 820 ℃ in the β single-phase temperature region, the microstructure is composed of coarse β grains. After single annealing, the alloy has low strength and high plasticity, and the quantity of dimples in the fracture morphologies is large. After double annealing at 750 ℃×1 h+540 ℃×8 h or 820 ℃×1 h+540 ℃×8 h, the secondary α phase is precipitated in a large number, the strength of the alloy increases significantly, but the plasticity is low, and obvious secondary cracks appear in the fracture morphologies.

Key words: metastable β-type titanium alloy, microstructure, tensile properties, fracture morphology

CLC Number:

TG156.1

Yue Xu, Zhang Mingyu, Yang Jialuo, Tong Xiaole, Zhao Zibo, Qiao Enli, Zhang Qi, Ye Hongchuan. Effect of heat treatment process on microstructure and tensile properties of metastable β-type titanium alloy[J]. Heat Treatment of Metals, 2023, 48(7): 187-192.

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