目的 合金钢通常具有高强度和高硬度，可应用于防护材料。以高强度钢等合金钢为研究对象，定量表征其在宽温域下的动态再结晶稳态应力。方法 基于Li能量等效原理，从位错的增值与湮灭角度出发，通过考虑位错能与热能对材料达到稳态流动阶段贡献等效的角度建立无拟合参数的合金钢温度相关性动态再结晶稳态应力理论表征模型。结果 模型预测结果与获取的5组动态再结晶稳态应力实验结果具有良好的一致性，与实验结果最大误差为1.9%，实现了对合金钢温度相关性动态再结晶稳态应力的合理预测。通过分析弹性模量和屈服强度对动态再结晶稳态应力的定量影响及其随温度的演化，发现在一定温域内，提高屈服强度和弹性模量均会提升合金钢的稳态应力。结论 该工作为定量评价合金钢在宽温域下的动态再结晶稳态应力提供一种有效的方法，为建立宽温域力热耦合本构关系提供理论基础。

Alloy steel usually has high strength and hardness and can be used as protective materials. The work aims to quantitatively study the dynamic recrystallization stress of alloy steel such as high-strength steel in a wide temperature range. Based on the Li'principle pf energy equivalence, a theoretical characterization model for the temperature-dependent dynamic recrystallization of alloy steel without fitting parameters was established by considering the equivalent contribution of dislocation energy and thermal energy to the steady-state flow of the material from the perspective of growth and annihilation of dislocation. The results predicted by the model were in good agreement with the experimental results obtained from 5 groups of dynamic recrystallization steady-state stress, and the maximum error was 1.9%, which realized the reasonable prediction of the dynamic recrystallization steady-state stress of alloy steel. By analyzing the quantitative effects of elastic modulus and yield strength on the steady-state stress of dynamic recrystallization and its evolution with temperature, it was found that the steady-state stress of alloy steel could be increased by increasing the yield strength and elastic modulus within a certain temperature range. This work provides an effective method for quantitative evaluation of dynamic recrystallization steady-state stress of alloy steel in a wide temperature range, and provides a theoretical basis for establishing the force-thermal coupling constitutive relationship in a wide temperature range.