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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144μm/min,而双相硅钢平均长大速率为68μm/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。
The effect of initial grain size and austenite content on the stress-strain curve and softening amount of Fe-3% Si steel was studied by single-pass compression and isothermal spray quenching experiments with different process parameters on a thermomechanical simulator. The results show that the initial austenite content increases from 800 ℃ to 1200 ℃ with the increase of isothermal temperature, and the average austenite content increases from about 4% to about 13% The average grain size growth rate of single-phase silicon steel was 144μm / min at 1200 ℃ for 1 ~ 5 min, while the average growth rate of dual-phase silicon steel was 68μm / min. During the work-hardening stage, the austenite content and the initial grain size have little effect on the true stress-true strain curve. When the work-hardening and dynamic softening reach balance, the stress decreases with increasing austenite content and grain size . Single-pass compression + isothermal quenching experiments show that the smaller the initial grain size, the higher the content of austenite particles, the faster the recrystallization softening rate of silicon steel increases, the higher the recrystallization fraction.