【摘要】 利用Gleeble 1500热模拟试验机研究了紧凑式带钢(CSP)工艺生产汽车大梁板在不同连续冷却工艺条件下的组织变化情况,并绘制了试验条件下动态CCT曲线。试验结果表明,连铸板坯的连续冷却相变温度随着冷速的提高而降低,当冷却速率较低时,相变后的组织为多边形铁素体+部分珠光体;随着冷速的提高,铁素体晶粒尺寸减小,当冷却速率大于20℃/s,试样显微组织中出现部分粒状贝氏体。通过优化工艺参数可以生产出强韧性良好的热轧低碳高强度汽车板。更多还原

【Abstract】 The microstructure evolution of automobile beam steels produced by CSP(compact strip production) line under continuous cooling was simulated with a Gleeble-1500 thermomechanical simulator.The continuous cooling transformation curves were drawn using thermal dilation method.The experimental results show that the phase transition temperature during continuous cooling lowered by increasing the cooling rate.The microstructure after phase transformation consists of polygonal ferrite and some pearlite when the cooling rate is low.The ferrite grain size is decreased with the increase of cooling rate.When the cooling rate reaches 20 ℃/s,there is some fraction of granular bainite appears in the microstructure.High strength low carbon automobile beam steels with good toughness can be produced by optimizing the process parameters.更多还原