冷轧基板SPHE动态再结晶行为研究  

Research on the Dynamic Recrystallization Behavior of the Stamping Steel SPHE

作　　者：曾松盛[1] 刘旭辉[1] 彭伟[1] 成小军[1] 

机构地区：[1]湖南华菱涟源钢铁集团有限公司技术中心,湖南娄底417009

出　　处：《轧钢》2011年第1期35-38,53,共5页Steel Rolling

摘　　要：通过热模拟实验研究了冷轧基板SPHE钢的动态再结晶行为。结果表明:在热变形过程中,变形温度越高,应变速率越小,越容易发生动态再结晶。SPHE钢发生动态再结晶的激活能为:Q_d=125.793kJ/mol;描述动态再结晶的动力学方程为:f_(dyn)=I-exp(-b(Z)t^(n(Z))),计算得到了其中的系数b(Z)、n(Z);描述动态再结晶体积百分数的方程为:X_(dyn)=1-exp[-k((e-ε_c)/ε_p)~m],通过非线性回归求出系数k、m;根据实验值和变形参数,作出SPHE钢的动态再结晶状态图,从而可优化热轧工艺,提高产品的质量。The recrystallization behavior of the SPHE steel during the hot deformation was investigated by physical simulation experiments.The results show that the dynamic recrystallization is easily taken place when the hot deformation temperature was higher and the deforming rate was smaller.The recrystallization activation energy of the SPHE steel was equal to 125.793kJ/mol.The kinetics equation of the dynamic recrystallization is submitted as f_（dyn） = 1-exp（-b（Z）t^（n（Z）））,a series coefficient of b（Z）,n（Z） can be obtained by the calculation. The volume percent equation of dynamic recrystallization can be written as X_（dyn）= 1-exp[-k（（ε-ε_c） /ε_p）~m].the coefficient k,m can be obtained by the nonlinear regression.In the end,the state chart of the dynamic recrystallization of the SPHE steel is made according to the experimental value and the deformation parameter, the chart will optimize the hot rolling process to improve the product quality.

关 键 词：再结晶激活能 动力学方程 动态再结晶 体积百分数方程 动态再结晶状态图 

分 类 号：TG111.7[金属学及工艺—物理冶金]