电脉冲对取向硅钢凝固组织的影响

EFFECT OF ELECTRIC PULSE ON SOLIDIFICATION STRUCTURE OF ORIENTED SILICON STEEL

对熔融态钢液进行处理,研究了电脉冲对于取向硅钢凝固组织的影响作用,利用正交试验法研究了脉冲电容、频率、处理时间和电压等脉冲参数的作用效果。结果表明:电脉冲对钢锭晶粒组织具有明显的细化作用,凝固组织的等轴晶比例大幅上升,影响等轴晶比例的最显著性因素为脉冲频率,最优正交试验参数为电容1 200μF,脉冲频率1 Hz,处理时间5 s,脉冲电压800 V。随着输入能量的增大等轴晶率先增大后减小,脉冲输入能量为某值时,等轴晶率最大,利用经典形核理论和热力学对这一现象进行了解释。

The influence of electric pulse on the solidification structure of oriented silicon steel was investigated by applying electric pulse in molten steel. The affection due to different electric pulse parameters such as electric capacity, frequency, applied time and voltage was studied by orthogonal design test. The result showed that solidification structure of oriented silicon steel could be improved by the electric pulse, and the equiaxed crystal ratio increased obviously. The most influential parameter was the frequency, and the most optimal parameters combination was 1 200 p.F electric capacity, 1 Hz frequency, 5 s applied time and 800 V voltage. With the increasing of the power input, the equiaxed crystal ratio increased firstly and then decreased, while the power input was at a proper value, the equiaxed crystal ratio would be the highest. This phenomenon was explained by classical nucleation theory and thermodynamics.