The two-pass isothermal hot compression method was used to study the effect of different thermal deformation conditions on static recrystallization behavior in Ni–Cr–Mo series SA508Gr.4N low alloy steel with interval holding time ranging from 1 to 300 s, temperature ranging from 950 to 1150 °C, strain rate ranging from 0.01 to 1 s⁻¹, true strains ranging from 0.1 to 0.2, and initial austenite grain size ranging from 175 to 552 μm. It can be concluded that the static recrystallization volume fraction gradually increases with the increase in the deformation temperature, strain rate, strain and pass interval, and the decrease in the initial grain size, which is mainly due to the increase in the deformation energy storage and dislocations. Moreover, strain-induced grain boundary migration is the nucleation mechanism for static recrystallization of SA508Gr.4N low alloy steel. Based on the stress–strain curve, the predicted value obtained from the established static recrystallization kinetics model is in good consistence with the experimental value, and the static recrystallization thermal activation energy of SA508Gr.4N steel was calculated as 264,225.99 J/mol.

采用两次通过等温热压缩方法研究了不同热变形条件对Ni-Cr-Mo系列SA508Gr.4N低合金钢的静态再结晶行为的影响，间隔时间为1至300 s，温度范围为950至1150°C，应变率范围为0.01至1 s ^-1，真实应变范围从0.1到0.2，初始奥氏体晶粒尺寸从175到552μm。可以得出结论，静态再结晶体积分数随着变形温度，应变速率，应变和通过间隔的增加以及初始晶粒尺寸的减小而逐渐增加，这主要是由于变形能量存储量和变形量的增加所致。脱臼。此外，应变诱发的晶界迁移是SA508Gr.4N低合金钢静态再结晶的成核机理。根据应力-应变曲线，从建立的静态再结晶动力学模型获得的预测值与实验值高度吻合，SA508Gr.4N钢的静态再结晶热活化能计算为264,225.99 J / mol。