真空固溶气淬压力对Ti-4Al-5Mo-5V-6Cr-1Nb钛合金显微组织与力学性能的影响

doi:10.13251/j.issn.0254-6051.2026.01.041

金属热处理 ›› 2026, Vol. 51 ›› Issue (1): 269-274.DOI: 10.13251/j.issn.0254-6051.2026.01.041

真空固溶气淬压力对Ti-4Al-5Mo-5V-6Cr-1Nb钛合金显微组织与力学性能的影响

胡生双¹, 王浩军¹, 吉丽², 吴海峰¹, 王文博¹, 杜垚鑫¹

1.中航西安飞机工业集团股份有限公司, 陕西西安 710089;
2.南昌航空大学材料科学与工程学院, 江西南昌 330063

收稿日期:2025-07-21 修回日期:2025-10-28 出版日期:2026-01-25 发布日期:2026-01-27
通讯作者: 吉丽(1988—),女,讲师,博士,E-mail:71009@nchu.edu.cn
作者简介:胡生双(1989—),男,高级工程师,主要研究方向为航空金属材料工艺,E-mail:hushengshuang2000@163.com。

Effect of gas quenching pressure for vacuum solution treatment on microstructure and mechanical properties of Ti-4Al-5Mo-5V-6Cr-1Nb titanium alloy

Hu Shengshuang¹, Wang Haojun¹, Ji Li², Wu Haifeng¹, Wang Wenbo¹, Du Yaoxin¹

1. Avic Xi'an Aircraft Industry Group Co., Ltd., Xi'an Shaanxi 710089, China;
2. School of Material Science and Engineering, Nanchang Hangkong University, Nanchang Jiangxi 330063, China

Received:2025-07-21 Revised:2025-10-28 Online:2026-01-25 Published:2026-01-27

摘要/Abstract

摘要： 研究了真空固溶气淬压力(0.1和0.2 MPa)对Ti-4Al-5Mo-5V-6Cr-1Nb钛合金的显微组织、力学性能、断口形貌和硬度的影响。结果表明,Ti-4Al-5Mo-5V-6Cr-1Nb钛合金经900 ℃真空固溶高压气淬+530 ℃时效后的组织中均出现明显的细小层片状次生α相和残余β相。提高固溶气淬压力后,时效后的晶界α相组织更为粗大且模糊,出现不连续区域,晶内片层状α相片层厚度小幅增加,片层间距增大。与回充0.1 MPa氩气时相比,回充0.2 MPa氩气时冷速增大,合金的强度略有降低,但总体变化不大,在回充0.1 MPa氩气条件下LT向的强度最高。随着气淬过程从回充0.1 MPa氩气变为回充0.2 MPa氩气,断裂韧度呈现小幅度的提高,这是因为在固溶时效后析出的片层α相厚度随着冷却速率的提高而提高,因此断裂韧度也随之增大。另外,固溶气淬压力对Ti-4Al-5Mo-5V-6Cr-1Nb钛合金的硬度影响不大。

关键词: 固溶, 气淬压力, 钛合金, 显微组织, 力学性能

Abstract: Effect of gas quenching pressures (0.1 and 0.2 MPa) for vacuum solution treatment on microstructure, mechanical properties, fracture morphology and hardness of Ti-4Al-5Mo-5V-6Cr-1Nb titanium alloy was studied. The results show that obvious fine lamellar secondary α phase and residual β phase appear in the microstructure of the Ti-4Al-5Mo-5V-6Cr-1Nb titanium alloy after vacuum solution treatment at 900 ℃ with high-pressure gas quenching and aging at 530 ℃. With the increase of gas quenching pressure for vacuum solution treatment, the α phase at the grain boundaries after aging becomes coarser and more blurred, and discontinuous areas appear. The thickness of the intracrystalline lamellar α phase increases slightly, and its interlayer spacing increases. Compared with the gas quenching process of recharging 0.1 MPa argon gas, the cooling rate increases when 0.2 MPa argon gas is recharged, and the strength of the alloy slightly decreases, but the overall change is not significant. Under the condition of recharging 0.1 MPa argon gas, the strength in the LT direction is the highest. As the gas quenching changes from recharging 0.1 MPa argon gas to recharging 0.2 MPa argon gas, the fracture toughness shows a slight increase, which is due to the thickness of the α phase precipitated in the lamellar layer after solution treatment and aging increases with the increase of the cooling rate, and thus the fracture toughness also increases accordingly. In addition, the gas quenching pressure for vacuum solution treatment has little effect on the hardness of the Ti-4Al-5Mo-5V-6Cr-1Nb titanium alloy.

Key words: solution treatment, gas quenching pressure, titanium alloy, microstructure, mechanical properties

中图分类号:

TG456

胡生双, 王浩军, 吉丽, 吴海峰, 王文博, 杜垚鑫. 真空固溶气淬压力对Ti-4Al-5Mo-5V-6Cr-1Nb钛合金显微组织与力学性能的影响[J]. 金属热处理, 2026, 51(1): 269-274.

Hu Shengshuang, Wang Haojun, Ji Li, Wu Haifeng, Wang Wenbo, Du Yaoxin. Effect of gas quenching pressure for vacuum solution treatment on microstructure and mechanical properties of Ti-4Al-5Mo-5V-6Cr-1Nb titanium alloy[J]. Heat Treatment of Metals, 2026, 51(1): 269-274.

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真空固溶气淬压力对Ti-4Al-5Mo-5V-6Cr-1Nb钛合金显微组织与力学性能的影响

Effect of gas quenching pressure for vacuum solution treatment on microstructure and mechanical properties of Ti-4Al-5Mo-5V-6Cr-1Nb titanium alloy

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