在Gleeble-3500热模拟试验机上对高强汽车钢进行了热变形处理,研究了热变形温度、应变速率、变形量和初始冷却速度对其应力应变曲线和显微组织的影响。结果表明,在相同的热变形温度下,应变速率越大,其同样应变量下的应力值越高;在相同应变速率下,随着热变形温度的升高,峰值应力逐渐降低;热变形温度、应变速率、变形量和初始冷却速度对实验钢中碳化物的微观结构和尺寸都有明显影响。 High-strength automotive steels were hot deformed on a Gleeble-3500 thermal simulator to study the effect of thermal deformation temperature, strain rate, deformation and initial cooling rate on the stress-strain curves and microstructures. The results show that under the same heat distortion temperature, the higher the strain rate is, the higher the stress is at the same strain level. Under the same strain rate, the peak stress decreases with the increase of the heat distortion temperature. The heat distortion temperature , Strain rate, amount of deformation and initial cooling rate have obvious influence on microstructure and size of carbides in experimental steel.