Hot deformation behavior and phase transformation of GH4720Li alloy

被引：0

作者：

Kan, Zhi ^{[1
,2
]}

Du, Linxiu ^{[1
]}

Hu, Jun ^{[1
]}

机构：

[1] State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang,110004, China

[2] Corporation of Fushun Special Steel, Fushun,113001, China

来源：

Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | 2016年 / 45卷 / 02期

关键词：

Strain rate - Activation energy - Compression testing - Deformation - Dynamic recrystallization - Hot working;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The hot deformation behavior of GH4720Li alloy was investigated at the temperature of 1080~1180℃ and strain rate of 0.01~10 s-1 by the hot compression tests. True stress-true strain curves and deformation microstructures were also researched. The hot deformation activation energy was calculated. In addition, the constitutive equation and processing map for hot working were established. The results show that dynamic recrystallization is the dominant softening mechanism during hot deformation. Fully recrystallized grains are obtained at strain of 0.7, temperature of 1120~1180℃ and strain rate of 0.1~1 s-1. The optimum hot deformation temperature is 1120~1140℃. The behavior of γ' phrase precipitation leads to the prominent change of the peak value of stress and the hot deformation activation energy. Besides, the minimum hot deformation activation energy is 602 kJ/mol at 1160℃. When the strain rate is greater than 1 s-1, flow instability will occur in the alloy. © 2016, Science Press. All right reserved.

引用

页码：363 / 368