Ti-38644钛合金热变形行为及组织演变

doi:10.13251/j.issn.0254-6051.2025.03.032

金属热处理 ›› 2025, Vol. 50 ›› Issue (3): 201-207.DOI: 10.13251/j.issn.0254-6051.2025.03.032

Ti-38644钛合金热变形行为及组织演变

董恩涛¹, 滕艾均¹, 方强², 陈鑫³, 代广霖³, 康强¹, 王鹏¹, 耿乃涛²

1.鞍钢集团北京研究院有限公司, 北京 102200;
2.成都先进金属材料产业技术研究院股份有限公司, 四川成都 610303;
3.攀钢集团江油长城特殊钢有限公司, 四川江油 621704

收稿日期:2024-10-08 修回日期:2025-01-20 出版日期:2025-03-25 发布日期:2025-05-14
作者简介:董恩涛(1989—),男,工程师,博士,主要研究方向为钛及钛合金新工艺研发及组织性能控制,E-mail:etdd@163.com

Hot deformation behavior and microstructure evolution of Ti-38644 titanium alloy

Dong Entao¹, Teng Aijun¹, Fang Qiang², Chen Xin³, Dai Guanglin³, Kang Qiang¹, Wang Peng¹, Geng Naitao²

1. Ansteel Beijing Research Institute Co., Ltd., Beijing 102200, China;
2. Chengdu Advanced Metal Materials Industry Technology Research Institute Co., Ltd., Chengdu Sichuan 610303, China;
3. Pangang Group Jiangyou Changcheng Special Steel Co., Ltd., Jiangyou Sichuan 621704, China

Received:2024-10-08 Revised:2025-01-20 Online:2025-03-25 Published:2025-05-14

摘要/Abstract

摘要： 使用Gleeble-3800热模拟试验机,在温度范围为800~1000 ℃、应变速率范围为0.01~50 s^-1、压缩量为60%条件下对亚稳β型Ti-38644钛合金进行等温热压缩试验,分析不同变形条件下的流变应力曲线,构建Arrhenius本构方程和热加工图,并探究变形参数对其微观组织的影响。结果表明,Ti-38644钛合金在热变形过程中随应变增加发生加工硬化及动态软化,且流变曲线达到峰值后发生不连续屈服现象。流变应力随着变形温度增加和应变速率降低而降低。结合热加工图,发现失稳区主要集中在高应变速率区域,而功率耗散因子η的峰值区域出现在温度840~1000 ℃和应变速率0.01~0.1 s^-1的范围内,组织呈现动态再结晶特征。

关键词: Ti-38644钛合金, 热压缩, 流变曲线, 微观组织, 动态再结晶

Abstract: Isothermal thermal compression tests of metastable β titanium alloy Ti-38644 with the strain rate of 0.01-50 s^-1and reduction of 60% at the temperature between 800-1000 ℃ were carried out by a Gleeble-3800 thermal simulation machine. The flow stress curves under different deformation conditions were analyzed to establish the Arrhenius constitutive model and processing maps of the Ti-38644 titanium alloy, and the effect of deformation parameters on the microstructure evolution was systematically studied. The results show that with the increase of strain, the flow curves successively present work hardening and dynamic softening, and the discontinuous yielding occurs after the peak stress. The flow stress decreases as the deformation temperature increases and the strain rate decreases. Combined with the hot processing map, it is found that the instability region is mainly concentrated in the high strain rate area, and the peak efficiency of power dissipation (η) region occurs in the temperature range of 840-1000 ℃ and the strain rate of 0.01-0.1 s^-1, meanwhile the microstructure shows dynamic recrystallization characteristics.

Key words: Ti-38644 titanium alloy, thermal compression, flow curves, microstructure, dynamic recrystallization

中图分类号:

TG146.2

董恩涛, 滕艾均, 方强, 陈鑫, 代广霖, 康强, 王鹏, 耿乃涛. Ti-38644钛合金热变形行为及组织演变[J]. 金属热处理, 2025, 50(3): 201-207.

Dong Entao, Teng Aijun, Fang Qiang, Chen Xin, Dai Guanglin, Kang Qiang, Wang Peng, Geng Naitao. Hot deformation behavior and microstructure evolution of Ti-38644 titanium alloy[J]. Heat Treatment of Metals, 2025, 50(3): 201-207.

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Ti-38644钛合金热变形行为及组织演变

Hot deformation behavior and microstructure evolution of Ti-38644 titanium alloy

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