期刊
MATERIALS CHARACTERIZATION
卷 183, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2021.111599
关键词
TiAl alloy; Hot compression deformation; Hot processing map; Deformation microstructure characteristics
类别
资金
- National Natural Science Foundation of China [51805335]
The hot compression test of a Ti-47.5Al-2.5 V-1.0Cr-0.2Zr alloy was conducted to establish hot processing maps and determine optimal thermal processing parameters and instability regions. Different microstructures were observed in various regions of the processing maps, with the microstructures in the optimal hot working condition showing better characteristics than those in the instability region. The study demonstrated the authenticity of the thermal processing safety region and the instructive role of the processing map in choosing thermal processing parameters.
The hot compression test of a Ti-47.5Al-2.5 V-1.0Cr-0.2Zr alloy was carried out at 1050-1200 degrees C and a strain rate of 0.001-1 s(-1) by a Gleeble3800 thermal simulation testing machine. The hot processing maps at the true strains of 0.2, 0.4, 0.6, and 0.8 were established, and the optimal thermal processing parameter region and the instability region were determined. The microstructures corresponding to different regions of the processing maps were systematically studied, and the validity of the established processing maps were verified. The results indicated that when the true strain is 0.8, the optimal hot working parameter region are 1132-1185 degrees C and 0.001-0.002 s(-1), respectively. The instability region are 1050-1125 degrees C/0.04-1 s(-1) and 1125-1200 degrees C/0.7-1 s(-1), respectively. The corresponding microstructures were lamellar microstructures with a bending and twisting deformation. At the same time, the instability phenomena, such as micro-cracks and voids, were found, and a large number of dislocation pile-ups appeared in the lamellar crystals. The dynamic recrystallization (DRX) degree of the microstructures corresponding to the optimal hot working parameter region is relatively complete, and the recrystallized grain size is relatively uniform. There is almost no residual lamellar microstructure, and no micro-cracks were found. The microstructures in the optimal hot working condition is obviously better than that in the instability region. The thermal processing safety region obtained in this work is authentic, and the processing map has a certain instructive role in the choice of thermal processing parameters.
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