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本文报道 Nb,Ti 微合金钢的热变形动态模拟变形抗力模型。在试验中用热加工模拟试验机进行高温压缩试验,其变形温度为1123—1423K,变形速率为0.1—60s~(-1)。结果表明,在峰值以前该钢种的流变应力数学模型为:σ=5.99.ε~(0.167)·(?)~(6.47×10~(-5)·T)·exp(4064/T)。形变激活能(Q)为444 kJ/mol,β系数为0.080。峰值应力(σ_p),临界应变(ε_c)和温度补偿应变速率参数(Z)之间的关系分别为:σ_p=12.56·lnZ-391.8;lnε_c=0.157·lnZ-7.39。
This paper reports the hot deformation deformation simulation model of Nb and Ti microalloyed steels. In the experiment, hot working simulation test machine was used to carry out high temperature compression test. The deformation temperature was 1123-1423K and the deformation rate was 0.1-60s ~ (-1). The results show that the flow stress mathematical model of the steel before the peak value is: σ = 5.99 · ε ~ (0.167) · (?) ~ (6.47 × 10 -5) · T) · exp (4064 / T) . The deformation activation energy (Q) was 444 kJ / mol and the beta coefficient was 0.080. The relationships between peak stress (σ_p), critical strain (ε_c) and temperature compensated strain rate (Z) are: σ_p = 12.56 · lnZ-391.8; lnε_c = 0.157 · lnZ-7.39.