The hot deformation behavior of a low-alloy offshore steel was systematically investigated within the temperature range of 850–1150 °C and strain rate range of 0.01–10 s^–1, via hot compression testing. The hot working equation, grain size model and recrystallization kinetic models of the steel were developed by fitting the experimental data. The results show that the decrease in Zener–Hollomon Z-parameter value (the increase in deformation temperature and the decrease in strain rate) is beneficial for the occurrence of dynamic recrystallization, and the grain size can be refined by increasing the Z-parameter value within the deformation range of dynamic recrystallization. However, when the Z-parameter value is higher than 3.43 × 10¹⁶, dynamic recrystallization will be difficult to occur within the range of experimental deformation conditions. Additionally, processing maps at different strains were constructed. According to the processing map and microstructural analysis, the optimal hot working conditions of the studied steel are within the temperature range of 1000–1100 °C and strain rate range of 0.1–1 s⁻¹, and a complete recrystallization microstructure with fine homogeneous grains could be obtained.

通过热压缩试验，系统地研究了低合金海上钢在850-1150°C的温度范围和0.01-10 s ^-1的应变速率范围内的热变形行为。通过拟合实验数据，建立了钢的热加工方程，晶粒尺寸模型和再结晶动力学模型。结果表明，Zener-Hollomon Z参数值的减小（变形温度的升高和应变速率的减小）有利于动态再结晶的发生，而通过增加Z参数值可以细化晶粒尺寸在动态再结晶的变形范围内。但是，当Z参数值大于3.43×10时^{如图16所示}，在实验变形条件的范围内将难以发生动态再结晶。另外，构建了不同菌株的加工图。根据加工图和显微组织分析，研究钢的最佳热加工条件是在1000–1100°C的温度范围内和0.1–1 s ^-1的应变速率范围内，并且具有细晶粒均匀的完整的再结晶组织可以获得。