摘要
采用热模拟试验机研究占相时效态GH4169合金在变形温度为980～1100℃、应变速率为1×10-3-1s-1条件下的热压缩变形行为，绘制真应力一真应变曲线。结果表明：该合金在变形过程中出现了明显的动态软化行为。利用摩擦修正后的峰值应力数据构建了该合金的热压缩本构方程，获得了本构方程材料常数分别为a=0．005626、n=4．2643、A=5．6185×10^17、Q=486．8kJ／mol。构建了不同应变量s下合金本构方程材料常数的五次多项式组，并根据多项式对其流变应力进行了预测。结果表明其预测数据与摩擦修正数据基本相符。利用动态材料模型方法建立了该合金在不同应变量下的热加工图，分析了其在不同变形条件下的动态再结晶特性及流变失稳行为。
The hot compressive deformation behavior of delta-processed GH4169 alloy was investigated at temperature range of 980-1100 ℃ with strain rate from 1 × 10^-3 to 1 s^-1 by thermal simulator. The true stress-true strain curves were obtained. The results show that the apparent dynamic softening behaviors occur during deformation. By using the friction-corrected peak stress data, the constitutive equation of the alloy for hot compression was established. The material constants are obtained to be a=0.005626, n=4.2643, A=5.6185 × 10^17, Q=486.8 kJ/mol, respectively. A group of five-order polynomials showing the relationship between material constants of the constitutive equation and the strain was constructed, by which the flow stress was predicted. The predicted data are in good agreement with the friction-corrected one. According to the methods of dynamic material model, the hot processing maps of the alloy at different strains were established. The dynamic recrystallized characteristic under different deformation conditions and the flow instability behavior were also analyzed.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2015年第10期2727-2737,共11页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(51301204
51134003)
关键词
GH4169合金
本构方程
热加工图
动态再结晶
流变失稳
GH4169 alloy
constitutive equation
hot processing map
dynamic recrystallization
flow instability
