利用Gleeble-1500D热模拟试验机对钒、钛、铌微合金化Q345B低合金高强度结构钢（HSLA）进行了高温单道次压缩试验。测量了不同变形温度和变形速率下该钢的变形行为，分析了各变形参数对该钢动态再结晶和变形抗力的影响，得出动态再结晶激活能为451.47kJ/mol。并且建立了高温变形抗力的分段函数流变模型，该模型计算结果与试验值吻合较好。
The high tempeture single-pass compression experiment was carried out with Gleeble-1500D thermal simulator for V-Ti-Nb microalloyed Q345B steel (HSLA). The deformation behaviors of this steel was measured under different deformation temperatures and deformation rates, and the influence of process parameters on the dynamic recrystallization and deformation resistance was investigated. The value of Qdef was 451.47kJ/mol. The rheological model of segmented function of high temperature deformation resistance was established. The calculated results by the rheological model were in good agreement with experiments.
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