铸造技术2026，Vol.47Issue(8)：912-925,14.DOI:10.16410/j.issn1000-8365.2026.6133
TA15钛合金热变形模型及组织演变规律研究
Study on Hot Deformation Modelling and Microstructure Evolution of TA15 Titanium Alloy
杨宏伟 1刘家奥 2李昌 2郭良刚 3杨岩峰3
作者信息
- 1. 西北工业大学凝固技术全国重点实验室,陕西西安 710072||江西景航航空锻铸有限公司,江西景德镇 333400
- 2. 陕西天成航空材料股份有限公司,陕西咸阳 712023
- 3. 西北工业大学凝固技术全国重点实验室,陕西西安 710072
- 折叠
摘要
Abstract
The hot deformation behavior and microstructure evolution of TA 15 titanium alloy were systematically investigated via isothermal hot compression tests conducted at deformation temperatures ranging from 820 to 970℃ and strain rates ranging from 0.001 to 1.000 s-1.The true stress-strain curves exhibit typical flow softening characteristics,with flow stress decreasing with increasing temperature and increasing strain rate.A strain-compensated Arrhenius-type constitutive model is established,with a good predictive ability,a correlation coefficient(R)of 0.990 and an average absolute relative error(AARE)of 8.26％over the strain rate range of 0.001～1.000 s-1.On the basis of the dynamic materials model(DMM),heat-processing maps were constructed,identifying the instability domain at 820～860℃/0.1～1.0 s-1,which corresponds to the microstructural features of suppressed recrystallization and abnormally elevated KAM values at high strain rates.EBSD analysis reveals that discontinuous dynamic recrystallization(DDRX)dominates at 820℃,resulting in the formation of a necklace-like equiaxed fine-grained structure.As the temperature increases to 960～970℃,the microstructure evolves into a fully lamellar structure.At temperatures near the β-transus,decreasing the strain rate to 0.001～0.010 s-1 favours the formation of a uniform and coarse fully lamellar structure,whereas increasing the strain rate to 0.1～1.0 s-1 results in the retention of more equiaxed α phase and refined β grains(from＞100 μm to～15 μm).关键词
TA15钛合金/热变形/本构模型/热加工图/动态再结晶Key words
TA15 titanium alloy/hot deformation/constitutive model/processing map/dynamic recrystallization分类
矿业与冶金引用本文复制引用
杨宏伟,刘家奥,李昌,郭良刚,杨岩峰..TA15钛合金热变形模型及组织演变规律研究[J].铸造技术,2026,47(8):912-925,14.
