热变形对高强汽车钢组织及性能的影响

Influence of Thermal Deformation on Microstructure and Properties of High Strength Automobile Steel

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。

The thermal deformation of high strength automobile steel was carried out using a Gleeble-3500 thermal simulation test machine, and the influence of thermal deformation temperature, strain rate, deformation amount and initial cooling rate on the stress-strain curves and microstructure of the steel was studied. The results show that, under the same thermal deformation temperature and the same strain rate, the greater the strain rate is, the higher the stress is, and the peak stress decreases gradually with the increase of thermal deformation temperatures. The thermal deformation temperature,strain rate, deformation quantity and initial cooling speed have obvious impact on the form and size of the carbides in the steel.