卷取温度对超低碳T-3CA第二相析出的影响

Effect of coiling temperature on precipitation of second phase in ultra-low carbon T-3 CA steel

为研究卷取温度对超低碳T-3CA中第二相粒子析出行为的影响,采用金相、TEM等检测手段,分析了580、630、680℃3个典型卷取温度下超低碳T-3CA中第二相粒子的析出特性,结果发现卷取温度越高,热轧形成的TiC粒子尺寸越粗大,分布越稀疏。结合相关动力学计算分析了卷取温度对TiC粒子沉淀析出时临界晶核尺寸、相对形核率、相对沉淀析出时间的影响。结果表明,随着卷取温度由580提高到680℃,TiC粒子沉淀析出时临界晶核尺寸增大约1.0nm,相对形核率降低约1.0个数量级,相对沉淀析出孕育时间增大约0.8个数量级。

In order to study the effect of coiling temperature on the precipitation behavior of the second phase particles in ultra-low carbon T-3 CA steel,the precipitation characteristic of the second phase particles in ultra-low carbon T-3 CA steel under three typical temperatures 580,630 and 680 ℃ were studied by OM and TEM.The results showed that the higher the coiling temperature,the larger the TiC particles and the sparser distribution of them would be formed during the hot-rolling process.The coiling temperature’s influence on the precipitation behavior of the TiC particles was analyzed by the kinetic calculation of TiC precipitation.The calculation showed that with the coiling temperature raise from 580 to 680 ℃,the size of the crystal nucleus of TiC particle would be increased by nearly 1.0 nm,the nucleation rate of the TiC particle would be decreased by almost 1.0 order of magnitude and the incubation time of the TiC particles would be prolonged by nearly 0.8 order of magnitude.