热处理对锻态TC21钛合金组织及性能的影响

doi:10.13251/j.issn.0254-6051.2024.04.032

金属热处理 ›› 2024, Vol. 49 ›› Issue (4): 201-208.DOI: 10.13251/j.issn.0254-6051.2024.04.032

热处理对锻态TC21钛合金组织及性能的影响

何睿¹, 王杰^1,2, 尹慧³, 翟瑞志³, 向伟³, 吕东莉¹, 尹耀吉¹

1.西南石油大学新能源与材料学院, 四川成都 610500;
2.长沙理工大学材料科学与工程学院, 湖南长沙 410114;
3.中国第二重型机械集团德阳万航模锻有限责任公司, 四川德阳 618000

收稿日期:2023-10-10 修回日期:2024-02-26 出版日期:2024-04-25 发布日期:2024-05-27
通讯作者: 王杰,副教授,博士,E-mail:wangjie_4212@163.com
作者简介:何睿(1997—),男,硕士研究生,主要研究方向为钛合金热处理,E-mail:1623122675@qq.com。
基金资助:
四川省自然科学基金(2022NSFSC0325);德阳市科技计划(2021JBJZ011)

Effect of heat treatment on microstructure and properties of as-forged TC21 titanium alloy

He Rui¹, Wang Jie^1,2, Yin Hui³, Zhai Ruizhi³, Xiang Wei³, Lü Dongli¹, Yin Yaoji¹

1. School of New Energy and Materials, Southwest Petroleum University, Chengdu Sichuan 610500, China;
2. School of Materials Science and Engineering, Changsha University of Technology, Changsha Hunan 410114, China;
3. China National Erzhong Group Deyang Wanhang Die Forging Co., Ltd., Deyang Sichuan 618000, China

Received:2023-10-10 Revised:2024-02-26 Online:2024-04-25 Published:2024-05-27

摘要/Abstract

摘要： 设计12种固溶+时效处理工艺,对不同固溶温度(880~920 ℃)与时效温度(500~650 ℃)锻态TC21钛合金的显微组织与力学性能进行研究。结果表明,随着固溶温度的升高,初生α相的含量降低、尺寸变小,钛合金的塑性也随之变差;在同一固溶温度下,时效温度变化影响次生α相的含量及尺寸,随时效温度的升高,次生α相的弥散程度增大,钛合金的屈服强度呈先增后降的趋势,当时效温度过高,达到650 ℃时,次生α相会变粗大。只进行920 ℃×2 h固溶处理的试样R_p0.2=1107.0 MPa,R_m=1238.5 MPa,后续时效处理的加入使屈服强度与抗拉强度大幅提升,通过920 ℃×2 h固溶+590 ℃×4 h时效处理可使锻态TC21钛合金获得优良的综合力学性能,R_p0.2=1237.7 MPa,R_m=1322.0 MPa。

关键词: TC21钛合金, 固溶时效, 显微组织, 力学性能

Abstract: 12 kinds of solution treatment+aging processes were designed to study the microstructure and mechanical properties of as-forged TC21 titanium alloy under different solution treatment(880-920 ℃) and aging temperatures(500-650 ℃). The results show that as the solution treatment temperature rises, there is a reduction in the primary α phase′s volume and dimensions, leading to decreased ductility. At the same solution temperature, the change in aging temperature affects the content and size of the secondary α phase. With the aging temperature increasing, the dispersion degree of the secondary α phase increases, and the yield strength of the titanium alloy increases first and then decreases. When the aging temperature is too high, and reaches 650 ℃ the secondary α phase becomes coarse. Specimen is subjected only to solution treat at 920 ℃ for 2 h, Which exhibites a yield strength (R_p0.2) of 1107.0 MPa and a tensile strength (R_m) of 1238.5 MPa. The addition of subsequent aging treatment significantly enhances the yield and tensile strength. Especially, by solution treatment at 920 ℃ for 2 h followed by aging at 590 ℃ for 4 h, the as-forged TC21 titanium alloy achieves excellent comprehensive mechanical properties, with a yield strength (R_p0.2) of 1237.7 MPa and a tensile strength (R_m) of 1322.0 MPa.

Key words: TC21 titanium alloy, solution treatment and aging, microstructure, mechanical properties

中图分类号:

TG146.23

何睿, 王杰, 尹慧, 翟瑞志, 向伟, 吕东莉, 尹耀吉. 热处理对锻态TC21钛合金组织及性能的影响[J]. 金属热处理, 2024, 49(4): 201-208.

He Rui, Wang Jie, Yin Hui, Zhai Ruizhi, Xiang Wei, Lü Dongli, Yin Yaoji. Effect of heat treatment on microstructure and properties of as-forged TC21 titanium alloy[J]. Heat Treatment of Metals, 2024, 49(4): 201-208.

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热处理对锻态TC21钛合金组织及性能的影响

Effect of heat treatment on microstructure and properties of as-forged TC21 titanium alloy

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