摘要
采用Gleeble-3800热模拟试验机研究了热等静压态新型第四代粉末高温合金的热变形行为,变形温度1060~1140℃,应变速率0.001~1 s-1,真应变量0.69。结果表明,热等静压态合金热模拟压缩实验的高温流变曲线呈动态再结晶特征。基于双曲正弦函数型Arrhenius方程和实验数据,采用峰值应力以及应变修正两种方式构建了合金的高温流变本构方程。后者由于包含了应变量的影响,预测的合金热变形流变应力值与实际测试结果比较吻合,平均相对误差绝对值为7.87538%,能更好的反映合金在热变形过程中的流变行为,为合金热加工工艺的设计优化提供参考依据。
The hot deformation behavior of a fourth generation powder metallurgy(PM)superalloy was investigated by using a Gleeble-3800 simulator over the deformation temperature range of 1 060-1 140 ℃ and strain rate range of 0.001-1 s-1 with a true strain of 0.69. The results show that the flow stress curves of the alloy exhibits dynamic recrystallization future. Based on the hyperbolic sine Arrhenius-type model and experimental data,two kinds of constitutive equations are established by using peak stress and considering the influence of strain. The predicted flow stress values calculated by employing the latter one are consistent with the actual experimental values,with a low average absolute relative error of 7.875 38%. Thus,the developed constitutive model with a strain modification can be adopted to describe the hot deformation behavior of the alloy and provide references for the design and optimization of hot working.
作者
侯琼
陶宇
贾建
张国栋
曲敬龙
HOU Qiong;TAO Yu;JIA Jian;ZHANG Guo-dong;QU Jing-long(High TemperatureMaterials Research Institute,CISRI,Beijing 100081,China;GAONA Aero Material Co.,Ltd.,Beijing 100081,China;AECC Commercial Aircraft Engine Co.,Ltd.,Shanghai 200241,China)
出处
《粉末冶金工业》
CAS
北大核心
2020年第2期50-55,共6页
Powder Metallurgy Industry
基金
国家科技重大专项(2017-VI-0008-0078)。
关键词
粉末高温合金
热变形
本构方程
powder metallurgy superalloy
hot deformation
constitutive equation
