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利用Gleeble-1500热模拟试验机研究了3种含铌或不含铌低碳钢在850～1150℃,应变速率分别为0.05、1、10 s-1条件下的热变形行为。采用应变硬化速率-应力(θ-σ)曲线图较精确地获得了C-Mn钢的流变应力和峰值应力;用-dθ/dσ-σ曲线获取了含Nb试验钢的应变和应力值;用回归法确定了双曲线本构方程中的变形激活能,确定了3种试验钢发生动态再结晶的激活能分别为234.867、261.276、301.751 kJ/mol。随Nb含量的增加,试验钢的再结晶激活能逐渐升高。
The thermal deformation behavior of three niobium-containing or non-niobium mild steel at 850-1150 ℃ and strain rates of 0.05, 1, 10 s-1 were investigated by Gleeble-1500 thermal simulator. The flow stress and peak stress of C-Mn steel were obtained by using strain hardening rate-stress (θ-σ) curve. The strain and stress of Nb-containing test steel were obtained by -dθ / dσ- The deformation activation energy in hyperbolic constitutive equation was determined by regression method. The activation energies of dynamic recrystallization of the three kinds of test steel were determined to be 234.867, 261.276 and 301.751 kJ / mol, respectively. With the increase of Nb content, the recrystallization activation energy of test steel gradually increases.