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通过单道次等温热压缩实验,分别采用Najafizadeh-Jonas加工硬化率模型和Cingara-McQueen流变应力模型研究了高性能桥梁钢A709M-HPS485wf在温度为1273～1423 K,应变速率为0.1～3 s-1变形条件下的奥氏体动态再结晶临界条件,获得了动态再结晶的临界应力与峰值应力比(σc/σP)及临界应变与峰值应变比(εc/εP),且由线性回归方法建立了该钢动态再结晶临界应力(σc)及临界应变(εc)与变形参数之间的定量关系。
Through single-pass isothermal hot compression experiments, the high-performance bridge steel A709M-HPS485wf was studied by the Najafizadeh-Jonas work hardening model and the Cingara-McQueen flow stress model respectively at a temperature of 1273 ~ 1423 K and a strain rate of 0.1 ~ 3 The critical stress and peak stress ratio (σc / σP) and the critical strain and peak strain ratio (εc / εP) of dynamic recrystallization were obtained under the critical conditions of austenite dynamic recrystallization under s-1 deformation. Methods The quantitative relationship between the critical stress (σc) and critical strain (εc) of dynamic recrystallization and the deformation parameters was established.