TiAl-V-Cr合金近α相区的热变形行为

doi:10.13251/j.issn.0254-6051.2025.01.008

金属热处理 ›› 2025, Vol. 50 ›› Issue (1): 53-57.DOI: 10.13251/j.issn.0254-6051.2025.01.008

TiAl-V-Cr合金近α相区的热变形行为

刘宏武¹, 高帆¹, 冯像征¹, 李臻熙¹, 戴松嵒¹, 王青峰²

1.中国航发北京航空材料研究院先进钛合金航空科技重点实验室, 北京 100095;
2.燕山大学亚稳材料制备技术与科学国家重点实验室, 河北秦皇岛 066004

收稿日期:2024-10-12 修回日期:2024-12-04 出版日期:2025-01-25 发布日期:2025-03-12
通讯作者: 李臻熙,研究员,E-mail:13641145387@163.com
作者简介:刘宏武(1987—),男,高级工程师,主要研究方向为钛铝合金、高熵合金等高温结构材料的基础与应用,E-mail:liuhongwu0335@163.com。
基金资助:
中国航发自主创新专项(ZZCX-2022-035);稳定支持项目(KZ0C231525)

Hot deformation behavior of TiAl-V-Cr alloy near-α phase region

Liu Hongwu¹, Gao Fan¹, Feng Xiangzheng¹, Li Zhenxi¹, Dai Songyan¹, Wang Qingfeng²

1. Key Laboratory of Science and Technology on Advanced Titanium Alloys, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao Hebei 066004, China

Received:2024-10-12 Revised:2024-12-04 Online:2025-01-25 Published:2025-03-12

摘要/Abstract

摘要： 采用热物理模拟技术与SEM、EBSD、OM等组织表征方法研究了不同初始组织状态、应变速率及变形量对Ti-44Al-5V-1Cr合金近α相区(1250 ℃)热变形行为及组织的影响规律。结果表明:合金在1250 ℃热变形时,相同应变速率条件下,不同初始组织状态的流变应力差异较小,相同组织状态下,应变速率对流变应力的影响相对较大,随着应变速率的降低,流变应力明显降低;合金在近α相区热变形时以发生α相的动态再结晶为主,动态回复为辅,β相的存在能够有效抑制α晶粒的长大;变形程度的增加有助于细化α晶粒尺寸;合金在1250 ℃大挤压比热挤压加工后获得了较为均匀细小的全片层组织,平均片层尺寸在12~23 μm范围内。

关键词: TiAl合金, 近α相区, 热变形行为, 显微组织

Abstract: Hot deformation behavior and microstructure evolution of Ti-44Al-5V-1Cr alloy deformed near the α-phase region (at 1250 ℃) under different conditions as various initial microstructure, strain rates and deformation were investigated by means of thermophysical simulation, SEM, EBSD and OM characterization. The results show that when the deformation temperature is 1250 ℃, the difference of flow stress variations in initial microstructure of the alloy under identical deformation rate are smaller. However, under the same microstructural condition, the strain rate has a relatively significant effect on the flow stress. As the strain rate decreases, the flow stress decreases noticeably. When the alloy is deformed near the α-phase region, the dynamic recrystallization of α phase is dominant, and the dynamic recovery is supplemented, while the β phase effectively suppresses the growth of α grains. In addition, increasing the deformation can facilitate the refinement of α grain size. After extrusion at 1250 ℃ with a high extrusion ratio, the alloy achieves a fine and uniform fully lamellar structure with average lamellar colony sizes of 12-23 μm.

Key words: TiAl alloy, near-α phase region, hot deformation behavior, microstructure

中图分类号:

TG139

刘宏武, 高帆, 冯像征, 李臻熙, 戴松嵒, 王青峰. TiAl-V-Cr合金近α相区的热变形行为[J]. 金属热处理, 2025, 50(1): 53-57.

Liu Hongwu, Gao Fan, Feng Xiangzheng, Li Zhenxi, Dai Songyan, Wang Qingfeng. Hot deformation behavior of TiAl-V-Cr alloy near-α phase region[J]. Heat Treatment of Metals, 2025, 50(1): 53-57.

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TiAl-V-Cr合金近α相区的热变形行为

Hot deformation behavior of TiAl-V-Cr alloy near-α phase region

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