Effect of heat treatment on microstructure and properties of metastable β titanium alloy

被引：0
|
作者：
Xiao S.-L. [1 ,2 ]
Chen Z.-Q. [1 ,2 ]
Jing K. [3 ]
Liang Z.-Q. [1 ,2 ]
Xu L.-J. [1 ,2 ]
Tian J. [1 ,2 ]
Chen Y.-Y. [1 ,2 ]
机构：
[1] National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin
[2] School of Materials Science and Engineering, Harbin Institute of Technology, Harbin
[3] Xi'an Aircraft Design and Research Institute of AVIC, Xi'an
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2022年 / 32卷 / 06期
关键词：
Creep; Heat treatment; Mechanical properties; Metastable β titanium alloy; Microstructure;
D O I：
10.11817/j.ysxb.1004.0609.2021-42090
中图分类号：
学科分类号：
摘要：
A metastable β titanium alloy of Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe-0.1B-0.1C was studied, and the effects of heat treatment on the microstructure, mechanical properties and creep behavior were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), room temperature tensile tests and creep tests. After solution aging treatment, a large number of acicular secondary α phases precipitate in the microstructure, while the secondary α phase keeps the Burgers relationship and the semi-coherent interface with the β matrix, which significantly strengthens the alloy. The highest yield strength of the alloy reaches 1444 MPa with the elongation of 4.2%. By analyzing the results of the creep tests, it is proposed that the creep rupture is dominated by the stress relief cracking mechanism caused by the α phase precipitating on the β grain boundary. When the grain boundary α phase is broken, there are more places for the nucleation of cavities and cracks, which deteriorates the creep resistance. Therefore, after solution-treated and aged at 300 ℃, the grain boundary α phase precipitates with continuous strip morphology, which makes this alloy has the longest creep life. © 2022, China Science Publishing & Media Ltd. All right reserved.
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页码：1655 / 1664
页数：9
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