考虑热传导和热辐射时6063铝合金在中等应变速率下热压缩温升的修正

Temperature Rise Correction of 6063 Aluminum Alloy during Hot Compression at Medium Strain Rate Considering Heat Conduction and Thermal Radiation

采用Gleeble-1500型热模拟试验机对6063铝合金进行了变形温度为400~520℃、应变速率为0.01~10s-1的热压缩试验,研究了热压缩过程的温升,在考虑了热传导和热辐射的作用后,探究了变形温度、应变速率和应变量等对绝热校正因子的影响,优化了材料变形的温升方程,对中等应变速率下热压缩的温升进行了修正。结果表明:绝热校正因子随着应变量的增大而降低,且变形温度越高,应变速率越大,则绝热校正因子就越大;热传导和热辐射对合金变形过程的温升具有显著的影响,修正后的温升与应变呈非线性关系,计算得到的温度变化曲线与实际所测得的基本一致,平均误差值小于3%。

The temperature rise of 6063 aluminum alloy during hot compression was studied by hot compression test conducted on Gleeble-1500 thermal simulator with strain rates of 0.01-10s-1 at 400-520 ℃.Considering the effect of heat conduction and heat radiation,the influence of deformation temperature,strain rate and strain on the adiabatic correction factor were investigated and the equation of material deformation temperature rise was optimized.The temperature rise during hot compression at medium strain rates was corrected.The results show that adiabatic correction factor decreased with the increase of strain.The higher deformation temperature and strain rate were,the greater adiabatic correction factor was.Heat conduction and heat radiation had a significant influence on temperature rise during alloy deformation.The deformation temperature rise after correction had a nonlinear relationship with strain.Temperature changing curve calculated was almost the same with that measured and the average error was less than 3%.