缓冷出口温度对连续退火SPCC冷轧薄板屈服强度的影响

研究了缓冷出口温度对连续退火SPCC冷轧薄板组织和屈服强度的影响。结果表明:连续退火SPCC冷轧薄板的组织由等轴的铁素体晶粒和晶界处的块状渗碳体及晶粒内的颗粒状渗碳体组成。随着缓冷出口温度从680 ℃提高至700 ℃,平均晶粒尺寸从10.1 μm增加至12.5 μm;此外,提高缓冷出口温度还能够抑制晶界处块状渗碳体的形成,促进晶粒内细小渗碳体更加细小弥散的析出。当缓冷出口温度从680 ℃提高至700 ℃时,冷轧薄板的屈服强度约降低了28 MPa。

Effect of continuous annealing slow cooling outlet temperature on yield strength of SPCC cold rolled sheet

Effect of continuous annealing slow cooling outlet temprature on microstructures and yield strength of SPCC cold rolled sheet was studied. The results show that the microstructure of the continuous annealed SPCC cold rolled sheet mainly consists of equiaxed ferrite grains, massive cementites on grain boundaries and spheroidite cementites in grains. With the increase of slow cooling outlet temprature from 680 ℃ to 700 ℃, the average grain size increases from 10.1 μm to 12.5 μm. In addition, increasing the slow cooling outlet temprature can promote the precipitation of fine cementites in grains by inhibiting the formation of massive cementites on grain boundaries. When the slow cooling outlet temprature increases from 680 ℃ to 700 ℃, the yield strength of the continuous annealed SPCC cold rolled sheet decreases by about 28 MPa.