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采用分离式Hopkinson压杆技术分析了TWIP钢在冲击载荷下应变速率对其性能的影响,采用金相(OM)、X射线衍射(XRD)、透射电镜(TEM)等方法对其变形前后的显微组织进行了研究。结果表明:高应变速率下,TWIP钢的应力-应变曲线存在响应时间,并且在中间阶段出现了波浪形的应力起伏。TWIP钢变形前后都是奥氏体单相组织,形变孪晶与静态变形条件下的相比,较易于多个孪晶系生成,孪晶的宽度、数量增加,间距减小。孪晶与位错的交互作用、孪晶与孪晶的相互作用、特别是多次孪晶的出现是使TWIP钢得到强化的主要变形机制。
The effect of strain rate on the properties of TWIP steel under impact load was analyzed by split Hopkinson pressure bar. The effects of strain rate on the properties of TWIP steel before and after deformation were analyzed by OM, XRD and TEM. Microorganisms were studied. The results show that the stress-strain curve of TWIP steel has response time under high strain rate, and wave-shaped stress fluctuation appears in the middle stage. TWIP steel is austenite single phase before and after deformation. Compared with static deformation, TWIP steel is easier to produce twin system. The twins’ width and number increase and the spacing decreases. The interaction between twins and dislocations, the interaction between twins and twins, especially the occurrence of multiple twins are the main deformation mechanisms that make TWIP steel strengthened.