Microstructure and mechanical properties of new beta titanium alloy with heat treatment

被引：0
作者：
Yin R. [1 ]
Wang Q. [1 ,2 ]
Gao Q. [2 ]
Wang D. [2 ]
Yang Q. [2 ]
He D. [1 ]
机构：
[1] School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an
[2] Institute of Baoji Titanium Industry Group Co., Ltd., Baoji
来源：
Xiyou Jinshu/Chinese Journal of Rare Metals | 2016年 / 40卷 / 05期
关键词：
Heat treatment; Mechanical property; Metastable β titanium alloy; Microstructure;
D O I：
10.13373/j.cnki.cjrm.2016.05.002
中图分类号：
学科分类号：
摘要：
Reasonable heat treatment could significantly affect the microstructure and strengthening behavior of beta titanium alloy. The effects of heat treatment on the microstructure and mechanical properties of a new type Ti-Al-V-Mo-Cr-Zr-Nb-Fe beta titanium alloy treated with solution and aging treatment were investigated. The results indicated that the best solution temperature of the new alloy was 720℃, which could obtain single and uniform β phase. After aging at 440~520℃, it was found that the aging temperature had a great influence on morphology and size of α phase. The fine acicular-shape α phase precipitated in β matrix at lower temperature, and the average size was around 1~2 μm; when aging at high temperature of 520℃, the width and layer spacing of α phase increased, the grain size grew up to 3~5 μm, and needle α phase transformed into short rod-like. In this case, with the increase of temperature, tensile strength decreased and ductility increased. The best balance of strength and plasticity properties could be obtained for the alloy with solution at 720℃ and aging at lower temperature. 720℃/30 min, air cooling (AC)+440℃/12 h, AC were optimal heat treatment process parameters, under which this alloy could achieve excellent comprehensive mechanical properties (UTS(ultimate tensile strength)=1412.8 MPa, YS(yield strength)=1309.4 MPa, A(elongation)=8.56%, Z(reduction of area)=44.94%). © Editorial Office of Chinese Journal of Rare Metals. All right reserved.
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页码：415 / 420
页数：5
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