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采用DIL805A/T热模拟试验机研究了60Si2CrVAT弹簧钢在温度为900~1050℃、应变速率为0.001~1 s~(-1)条件下的高温变形行为。结果表明,在相同应变速率下,流变应力随变形温度的升高而降低,在同一温度下,流变应力随应变速率的增大而升高。使用修正的Arrhenius模型来描述60Si2Cr VAT弹簧钢高温拉伸变形时的本构方程,计算出变形激活能Q=331.21k J/mol,材料常数为A=3.176×10~(12),n=4.0643,a=0.01079 MPa~(-1),得到了高温拉伸本构方程。
The deformation behavior of 60Si2CrVAT spring steel at 900 ~ 1050 ℃ and strain rate of 0.001 ~ 1 s ~ (-1) was investigated by DIL805A / T thermal simulation testing machine. The results show that the flow stress decreases with the increase of deformation temperature at the same strain rate. At the same temperature, the flow stress increases with the increase of strain rate. The modified Arrhenius model was used to describe the constitutive equation of 60Si2Cr VAT steel during high temperature tensile deformation. The deformation activation energy Q = 331.21k J / mol, the material constant A = 3.176 × 10-12, n = 4.0643 , a = 0.01079 MPa ~ (-1), the tension constitutive equation was obtained.