连铸板坯凝固过程的数值模拟

Numerical simulation of solidification process of continuous casting slab

为得到连铸坯凝固末端的液相穴分布,以便选取轻压下参数,依据实际生产中二冷边界换热条件,采用有限元法对连铸厚板坯冷却传热过程进行数值模拟,并用远红外测温仪测试并校准Q235B300 mm×1650 mm铸坯表面温度,得到了连铸坯在任意段截面的温度场分布、凝固末端液相穴形状及铸坯中心纵截面固相率分布.结果表明,可以根据铸机实际情况,在距液面17.6～23.7 m处选取合适的轻压下参数.

To get the distribution of liquid core in the end of solidification,and to select the soft reduction parameters,considering the boundary conditions for secondary cooling of heat transfer on actual production,a mathematical model for thermal transmission to suit slab caster has been established.According to the surface temperature of 300 mm×1650 mm slab of Q235B steel measured by using infrared thermo scope,the temperature distributions at any casting section,the distribution of liquid core in the end of solidification and the distribution of fraction solid on longitudinal section of slab center have been obtained.It is shown that the soft reduction parameters can be selected at 17.6 ~ 23.7 m of liquid surface.