A286合金的热变形行为

Hot deformation behavior of A286 alloy

采用热压缩试验对A286合金在950~1150℃,应变速率为0.1~10 s^(-1)条件下的流变应力、组织进行了研究。结果表明,随温度和应变速率的增加,再结晶分数增加。采用双曲正弦函数描述了峰值应力与Zener-hollomon参数的关系,测试范围内,峰值应力条件下的再结晶激活能为464 k J/mol,峰值应力方程为■=1.79×10^(18){sinh(0.0044·σ_p)}exp(-464 000/RT),峰值应力计算值和试验值吻合较好。

The flow stress and microstructure of alloy A286 were investigated by using single-stage hot compression experiments in the temperature range of 950-1150 ℃ and at strain rate of 0. 1-10 s-1. The results show the volume fraction of recrystallization increases with the increase of temperature and stain rate. A hyperbolic sine function is adopted to describe the relationship between peak stress and Zenerhollomon parameter. The activate energy determined is 464 k J / mol for peak stress in the tested range and the constitutive equation for peak stress is ε= 1. 79 × 10^18{ sinh（ 0. 0044·σ_p） } exp（- 464 000 /RT）. The calculated values of peak stress agree well with the tested values.