Characteristics of hot compression deformation and microstructure evolution of spray formed nickel base superalloy

被引:0
|
作者
Kang Fuwei
Sun Jianfei [1 ]
Mang Guoqing
Li Zhou
Shen Jun
机构
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
[2] Harbin Univ Sci Technol, Sch Mat Sci & Engn, Harbin 150040, Peoples R China
[3] Inst Aeronaut Mat, Beijing 100095, Peoples R China
关键词
superalloy; spray forming; hot deformation; processing map; recrystallization;
D O I
暂无
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
The hot compression test of the spray formed plus hot isostatic pressed (HIP) nickel based superalloy was conducted on Gleeble-1500D thermal mechanical simulator at a temperature range of 1050-1140 degrees C, and strain rate range of 0.01-10.0 s(-1) with engineering strain 50%. The processing map and activation energy map of the alloy were established by using tested data, and microstructure evolution of deformed samples was also examined. The results show that the grain size of spray formed alloy does not significantly increase after HIP. Due to the variations of dislocation movement and density in deformation, the yield drop was observed only at higher temperature. Processing map and activation energy map indicate that the instability domain of the alloy is at the temperature range of 1050-1110 degrees C and strain rate of 0.01 s(-1), and the highest efficiency of power dissipation 07) appeared at 1110-1140 degrees C and 1.0-10.0 s(-1), and a platform region was also observed at 1140 V and 1.0-10.0 s(-1). So, the optimum conditions for thermomechanical processing correspond to the eta maximum region and activation energy platform region, at which the full dynamic recrystallization (DRX) occurred.
引用
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页码:1053 / 1058
页数:6
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