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新型高强韧钛合金薄板高温变形行为研究
Study of the High-Temperature Deformation Behavior of Novel High-Strength-High-Toughness Titanium Alloy Thin Sheets
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- DOI:
- 作者:
- 王鹏伟 1，王逸涵 2，陈家豪 1，李志鹏 3，董子祥 1，王润泽 1，唐斌 1
WANGPengwei1,WANG Yihan2,CHEN Jiahao1,LI Zhipeng3,DONG Zixiang1, WANGRunze1,TANGBin1
- 作者单位:
- 1. 西北工业大学 凝固技术全国重点实验室，陕西 西安 710072；2. 中国航空制造技术研究院，北京 100024；3. 中国航空 工业集团公司 沈阳飞机设计研究所，辽宁 沈阳 110035
1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China; 2. AVIC Manufacturing Technology Institute, Beijing 100024, China; 3. Shenyang Institute of Aircraft Design of China Aviation Industry Group Corporation, Shenyang 110035, China
- 关键词:
- TC21 钛合金；高温变形；超塑性；动态再结晶；相变
TC21 titanium alloy; high-temperature deformation; superplasticity; dynamic recrystallization; phase transformation
- 摘要:
- 为探究不同初始组织新型高强韧钛合金 TC21 薄板的高温力学响应和变形机制，选用具有片层组织和双态组织的 2 种 1.5 mm 厚薄板，开展高温拉伸实验。 借助扫描电子显微镜(SEM)及电子背散射衍射(EBSD)等技术手段，对不同变形条件下试样的微观组织特征进行表征。 研究发现，在 880 和 900 ℃ 2 种变形温度，以及 0.01 和 0.001 s-1 应变速率条件下，合金展现出超塑性变形特征，断后伸长率均超过 100%。 在高温变形进程中，动态再结晶和相变协同作用显著，表现为晶粒的细化及等轴化程度高且 β 相含量最多。To investigate the high-temperature mechanical response and deformation mechanisms of novel high-strength and high-toughness TC21 titanium alloy thin sheets with different initial microstructures, 1.5-mm-thick sheets featuring lamellar and duplex microstructures were utilized to conduct high-temperature tensile experiments. Microstructural characterization of the samples under various deformation conditions was performed by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). The results reveal that the alloy exhibits superplastic deformation characteristics at 880 and 900 ℃ with strain rates of 0.01 and 0.001 s-1,resulting in elongations exceeding 100%. During deformation, dynamic recrystallization and phase transformation exhibit a significant synergistic effect, manifested as grain refinement, pronounced equiaxialization, and a maximum β-phase content.