Abstract:  Based on the hot simulation test  the effect of deformation condition and microalloying element 0.018  0.056NB, 0.01 - 0.02V and 0.01 - 0.02Ti on behavior of hot deformation of 0.06 - 0.08C test steel has been analyzed. And based on the Sellas-Tartat equation, the mathematic models to calculate the stress- strain curves have been established, that are dynamic recover model σ_(e)+ (σ_p+σ_o)[1-exp(-3.23ε/ε_s)]^0.5, where σ_p- peak stress, σ_o- stress at onset of plasticstrain, ε- strain,ε_s-strain to onset of steady state by work hardening and recovering, and dynamic recrystallization model - σ=σ=σ_(e)-(σ_p-σ_ss)｛ 1- exp[-2.363(ε-ε_c)ε_c^0.3425)²｝ , where σ_ss-stress to onset of steady state by dynamic recrystallization, ε_c- strain for onset of dynamic recrystallization. The predicted results to rolling force by the models conform with that of measured value of 0.07C-0.018Nb test steel during commercial rolling.

摘要： 在热模拟实验的基础上，分析了变形条件及微合金元素Nb(0.018%~ 0.056%)、V(0.01%~ 0.02%)、Ti(0.01% ~0.02%)对0.06% ~0.08%C实验钢的热变形行为的影响。在Sellas-Tartat方程的基础上， 建立了应力-应变曲线数学模型:动态回复模型σ_(e)+ (σ_p+σ_o)[1-exp(-3.23ε/ε_s)]^0.5,式中：σ_p-峰值应 力,σ_o-初始应力，ε-变形应变，。σ_s-加工硬化与回复进入稳态的临界应变;动态再结晶模型σ=σ_(e)-(σ_p-σ_ss)｛ 1- exp[-2.363(ε-ε_c)ε_c^0.3425)²｝式中:σ_ss-动态再结晶进入稳态时的应力, ε_c-心动态再结晶临界应变。利用该模 型对0.07%C ~ 0.018%Nb实验钢工业轧制时轧制压力进行了预测,其结果与实测值吻合良好。