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针对稀土及铌微合金化Fe-3%Si无取向硅钢,在实验室利用Gleeble-1500D热模拟机进行了变形温度为900℃~1100℃、变形速率为0.001 s-1~5 s-1、变形量为60%的单道次热变形实验。分析了不同热变形条件下实验钢的应力-应变曲线以及变形组织,并计算了实验钢的热变形激活能Qd的值。实验结果表明,稀土及铌微合金化Fe-3%Si无取向硅钢在热变形过程中有部分再结晶晶粒出现在原始晶界以及晶界三角地带,但不同变形条件下的应力-应变曲线仍均为动态回复型;热变形激活能Qd分别为449.00 k J/mol、431.59 k J/mol,稀土及铌微合金化可以显著提高Fe-3%Si无取向硅钢热变形激活能,抑制动态再结晶的发生。
For the rare earth and niobium microalloyed Fe-3% Si non-oriented silicon steel, the deformation temperature was 900 ℃ ~ 1100 ℃ and the deformation rate was 0.001 s-1 ~ 5 s-1 in the laboratory using the Gleeble-1500D thermal simulator. Deformation of 60% of the single pass thermal deformation experiment. The stress-strain curves and deformation microstructure of the experimental steel under different hot deformation conditions were analyzed. The heat deformation activation energy Qd of the experimental steel was calculated. The experimental results show that some recrystallized grains of rare earth and niobium micro-alloyed Fe-3% Si non-oriented silicon steel occur in the original grain boundary and the triangular boundary zone during the thermal deformation, but the stress-strain curves under different deformation conditions The thermal deformation activation energy Qd is 449.00 kJ / mol and 431.59 kJ / mol, respectively. The micro-alloying of rare earth and niobium can significantly increase the thermal deformation activation energy of Fe-3% Si non-oriented silicon steel, Recrystallization occurs.