低硅电工钢变形抗力研究及应用

STUDY AND APPLICATION ON DEFORMATION RESISTANCE OF LOWER SILICON ELECTRIC STEELS

通过实验室冶炼硅含量为0．3％的电工钢，采用Gleeble-3500热／力学模拟试验机进行不同的变形温度、变形速度和变形程度压缩试验，研究了变形温度、变形速度和变形程度对变形抗力的影响。试验结果表明：该电工钢在850～900℃存在双相区，在此温度段随着温度的降低，铁素体逐渐增多，变形抗力反而下降；温度是对变形抗力影响最为强烈的一个因素，随着变形温度的升高，电工钢的变形抗力减小（双相区相反）。采用合理的回归公式，得到相应的回归系数和回归曲线，回归结果与实际值吻合较好。根据回归结果修改轧制模型，并开展了热轧工业试验，试验结果表明计算负荷和实际负荷比较接近，均小于轧机的额定值。

Eelectric steels with 0. 3% Si content produced in laboratory were compressed at different d - t, d - r and d - d to study the affect of deformation temperatures, deformation rates and deformation degrees on the defomation esistance by means of Gleekle - 3500 thermodynamic simulative testing machine. It has been found that the electric steel had a two - phase zone from 850℃ to 900℃ in which the ferrite increased and the deformation resistance decreased as the tern perature decreasing. Temperature was the most important factor which affected the deformation resistance. The higher the deformation temperture, the lower the deformation vesistance, but the developing tendency showed an invorse relationship in the two - phase zone. Justified regression formcla was used and the correspording ve gression coefficients and curves were obtained. It has been found that the computing results corres ponded with the actual values well. The rolling model was modified according to the regression result and the hot - rolling esperiment was conducted. The experimental results showed that the comp uting loads were close to actual rolling loads and were both lowey than the rated value of rolling mill.