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以一种加氢反应器用钢12Cr2Mo1为研究对象,利用Gleeble-3800热/力模拟试验机,在变形温度850~1150℃、应变速率0.001~0.1 s~(-1)进行了真应变为0.8的热压缩。回归计算了考虑应变补偿的本构方程,建立了基于动态材料模型的热加工图,分析了热变形条件下的组织演化规律。结果表明,利用5次多项式回归计算得到的本构方程可用来预测不同应变下的流变应力;随着变形温度的升高和(或)应变速率的降低,动态再结晶水平增加;在1050℃和0.001 s~(-1)的热变形下,12Cr2Mo1钢可获得均匀的完全动态再结晶组织。
A kind of hydrogenation reactor steel 12Cr2Mo1 was used as the research object. The true strain of the steel 12Cr2Mo1 was set to 0.8 at a deformation rate of 0.001 ~ 0.1 s ~ (-1) at a deformation temperature of 850 ~ 1150 ℃ using a Gleeble-3800 thermal / Hot compression. The constitutive equation considering the strain compensation was calculated by regression. The hot working diagram based on the dynamic material model was established, and the microstructure evolution under thermal deformation was analyzed. The results show that the constitutive equation calculated by the polynomial regression of 5 times can be used to predict the flow stress under different strains. The dynamic recrystallization increases with the increase of deformation temperature and / or strain rate. At 1050 ℃ And 0.001 s ~ (-1) thermal deformation, 12Cr2Mo1 steel can obtain uniform and completely dynamic recrystallization structure.