通过在热力模拟试验机上采用不同工艺参数的单道次压缩和等温喷水淬火实验,研究了初始晶粒尺寸和奥氏体含量对Fe-3％ Si钢应力-应变曲线和软化量的影响.结果表明:从800℃到1200℃,初始奥氏体含量随着等温温度的提高而增加,平均奥氏体含量由约4％增到约13％,其分布状态由弥颗粒状散趋向聚集粗化成棒状;在1200℃等温1～5 min,单相硅钢平均晶粒尺寸长大速率为144 μm/min,而双相硅钢平均长大速率为68 μm/min.在加工硬化阶段,奥氏体含量和初始晶粒尺寸对真应力-真应变曲线影响较小,当加工硬化和动态软化达到平衡时,随着奥氏体含量和晶粒尺寸的增加应力值降低.单道次压缩+等温淬火实验表明,初始晶粒越小,奥氏体粒子含量越高,硅钢再结晶软化率提高越快,再结晶分数越高.
Effect of initial grain size and the fraction of austenitic on stain-stress curves and soft behavior of Fe-3％ Si steel was investigated by single compression and isothermal quenching experiments carried out on a thermal simulator.The results show that the initial fraction of austenitic increases from 4％ to 13％ when the heat-treated temperature changes from 800 ℃ to 1200 ℃.The dispersed austenitic tends to gather into a bar.When sample is kept at 1200 ℃ for 1-5 min,the average grain growth rate of single-phase silicon steel is 144 μm/min,and that of double phase silicon steel is 68 μm/min.The effect of initial grain size and fraction of austenite on true stress-strain curve is small during work hardening.When the balance of work hardening and dynamic softening occurs,the stress value decreases with the increasing of austenite fraction and grain size.The experiment result of combination single compression with isothermal quenching shows that the faster recrystallized softening rate and the higher recrystallized fraction of silicon steel are obtained with the smaller initial grain size and the higher volume fraction of austenite particles.
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