期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.143776
关键词
Titanium alloy; Microstructure; Deformation mechanism diagram; Dynamic recrystallization; Ultra-fine grain
类别
资金
- National Natural Science of China [51771231, 52020105013]
- Innovation Province Construction Special Project of Hunan [2020GK4018]
- State Key Laboratory for Powder Metallurgy, China [2021]
The hot deformation mechanism of a Ti-2.5Zr-2Al titanium alloy was investigated using the double-cone compression test, providing a theoretical basis for designing an optimal alpha+beta forging process. Ultra-fine grains were obtained through hot compression at 800 degrees C, with a detailed analysis of the deformation mechanisms involved.
The alpha+beta forging is a key pass for the hot forging process of a Ti-2.5Zr-2Al titanium alloy. In this paper, the hot deformation mechanism of a Ti-2.5Zr-2Al titanium alloy was obtained by the double-cone compression test, which provides a theoretical basis for designing reasonable alpha+beta forging process to obtain ideal microstructure. A wide range of gradient strains and corresponding microstructure were obtained by using the double-cone compression test. The double-cone compression process was simulated by the finite element software. Electron backscatter diffraction technique (EBSD) and transmission electron microscope (TEM) were used to characterize the deformed microstructure of the double-cone specimen. The hot deformation mechanism diagram in the strain range of 0.2-1.2 and the temperature range of 700 degrees C-850 degrees C was constructed. At 800 degrees C, in the low strain region (<0.476), the main deformation mechanism is dynamic recovery (DRV), and continuous dynamic recrystallization (CDRX) begins to occur. In the medium strain region (0.476-1.006), the deformation mechanism is mainly CDRX, accompanied by a small amount of the deformation bands (DBs). Nevertheless, in the large strain region (>1.006), a large number of the DBs occur. The ultra-fine grains with an average size of about 0.46 um were obtained according to the hot compression under the strain of about 0.717 at 800 degrees C. The ultra grain refinement mechanism during hot deformation was summarized.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据