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利用分离式霍普金森压杆(SHPB)装置对原始组织为粒状珠光体的T8钢进行高应变速率变形实验,借助SEM、TEM及显微硬度计对变形后粒状珠光体钢的微观组织和硬度变化进行分析。高应变速率变形条件下的应力-应变曲线表明,随着应变速率的增加,粒状珠光体钢流变应力随之增大,表现出正的应变速率敏感性;冲击区域内的微观组织得到了明显细化,制备出了晶粒尺度在亚微米量级的超微细复相(铁素体+渗碳体)T8钢组织;当应变速率为3078.2 s-1时,铁素体晶粒尺寸为500~700 nm,渗碳体颗粒粒径为100~250 nm,硬度值由原始态的195 HV增至270 HV。
High-strain-rate deformation experiments were carried out on the split-type Hopkinson pressure bar (SHPB) device. The microstructure and hardness of the deformed pearlite steel after deformation were analyzed by SEM, TEM and microhardness tester Changes were analyzed. The stress-strain curves under high strain rate deformation show that with the increase of strain rate, the rheological stress of granular pearlite steel increases with the increase of strain rate, and the microstructure in the impact zone is obviously The microstructure of ultrafine multiphase (ferrite + cementite) T8 steel with grain size of submicrometer was prepared. When the strain rate was 3078.2 s-1, the ferrite grain size was 500 ~ 700 nm, the size of cementite particles is 100 ~ 250 nm, and the hardness increases from 195 HV in the original state to 270 HV.