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通过Gleeble--1500热模拟单轴压缩试验,研究了一种含1.79%Al(质量分数)的以Al替代Si微合金化高强度钢在温度为900~1100℃、应变速率为0.01~30 s-1条件下的热变形行为.建立了考虑应变量对材料常数影响的双曲正弦本构方程,利用建立的本构方程预测的应力--应变曲线与实验值吻合良好,表明建立的本构方程可以对实验钢的流变应力给出相对准确的预测.建立了实验钢的加工图,根据加工图分析确定了实验钢的动态再结晶区为1000~1100℃和0.01~1s-1.组织观察表明在动态再结晶区实验钢发生了动态再结晶,而失稳区对应的组织出现了变形集中带或“项链”组织.最后将建立的本构方程和加工图联合运用,为更全面地研究实验钢在不同变形条件下的热变形行为提供了方法.
By means of Gleeble - 1500 thermal simulation uniaxial compression test, a kind of Al - substituted Si microalloyed high strength steel containing 1.79% Al (mass fraction) was studied at a temperature of 900 ~ 1100 ℃ and a strain rate of 0.01 ~ 30 s -1 under the conditions of thermal deformation behavior.The hyperbolic sine constitutive equation considering the effect of strain on material constants is established.The stress-strain curve predicted by the established constitutive equation is in good agreement with the experimental data, indicating that the established constitutive The equation can give a relatively accurate prediction of the flow stress of the experimental steel, and the processing diagram of the experimental steel is established, and the dynamic recrystallization zone of the experimental steel is determined to be 1000-1100 ° C and 0.01-1s-1 according to the processing diagram analysis. The observation shows that dynamic recrystallization occurs in the experimental recrystallization zone and the deformed zone or “necklace ” structure appears in the corresponding zone of the destabilization zone. Finally, the constitutive equation and the processing diagram are combined to be more A comprehensive study of experimental steel under different deformation conditions provides a method of thermal deformation.