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.
引用
收藏
页码：1655 / 1664
页数：9
相关论文
共 26 条
  • [21] CHEN F W, XU G L, ZHANG X Y, Et al., Effect of α morphology on the diffusional β↔α transformation in Ti-55531 during continuous heating: Dissection by dilatometer test, microstructure observation and calculation, Journal of Alloys and Compounds, 702, pp. 352-365, (2017)
  • [22] SAHOO R, JHA B B, SAHOO T K., Effect of microstructure on the creep properties of Ti-6Al-4V alloys: An analysis, Transactions of the Indian Institute of Metals, 71, 7, pp. 1573-1582, (2018)
  • [23] KROMM A, LAUSCH T, SCHROEPFER D, Et al., Influence of welding stresses on relief cracking during heat treatment of a creep-resistant 13CrMoV steel: part Ⅰ-Effect of heat control on welding stresses and stress relief cracking, Welding in the World, 64, pp. 807-817, (2020)
  • [24] KROMM A, LAUSCH T, SCHROEPFER D, Et al., Influence of welding stresses on relief cracking during heat treatment of a creep-resistant 13CrMoV steel Part Ⅱ: Mechanisms of stress relief cracking during post weld heat treatment, Welding in the World, 64, pp. 819-829, (2020)
  • [25] ZHANG Z X, FAN J K, LI R F, Et al., Orientation dependent behavior of tensile-creep deformation of hot rolled Ti65 titanium alloy sheet, Journal of Materials Science & Technology, 75, pp. 265-275, (2021)
  • [26] SUN Xiao-ping, LUO Jin-hua, LEI Jin-wen, Et al., Effect of microstructure on high-temperature creep behavior of Ti6242S titanium alloy, Heat Treatment of Metals, 43, 1, pp. 105-110, (2018)
123