高应变速率拉伸条件下TWIP钢动态力学性能与组织演变规律的研究  

Research on Dynamic Mechanical Behavior and Microstructure Evolution Rule of TWIP Steel under High Strain Rate Tensile Condition

作　　者：高永亮[1] 胡士廉[1] 陈巍[1] 杨阳[1] 胡俊[1] 田雨江[1] 岑一鸣[1] GAO Yongliang;HU Shilian;CHEN Wei;YANG Yang;HU Jun;TIAN Yujiang;CEN Yiming(Ningbo Branch of China Academy of Ordnance Science,Ningbo 315103,China)

机构地区：[1]中国兵器科学研究院宁波分院

出　　处：《热加工工艺》2019年第16期49-53,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目（51401183）

摘　　要：利用Hopkinson拉杆在高应变速率下对TWIP钢进行了动态力学性能研究。基于动态力学实验数据,优化了材料的动态本构关系Johnson-Cook模型中的相关参数。采用金相显微镜、扫描电镜等对动态拉伸变形后TWIP钢的组织演变进行了研究。分析了TWIP钢的动态TWIP效应机理。结果表明:TWIP钢表现出较为明显的应变速率效应,即随应变速率的提高,材料的强度、塑性和能量吸收值均增加。获得了TWIP钢的组织演变规律。得到了TWIP钢在高应变速率下合理自洽的动态力学本构方程。得出了TWIP钢的动态TWIP效应机理。The dynamic mechanical properties of twinning induced plasticity (TWIP) steel was investigated under high strain rate tensile loading by using Hopkinson pull rod.Based on dynamic mechanical experiment data,the parameters in the Johnson-Cook model of dynamic mechanical constitutive equation of the TWIP steel were optimized.The microstructure evolution of Fe-Mn-C TWIP steel were investigated by OM and SEM after dynamic tensile deformation.The TWIP effect mechanism of TWIP steel was analysed.The results show that TWIP steel exhibits a positive strain rate sensitivity under high strain rate conditions.With the increase of strain rate,the strength,plasticity and energy absorption of the steel increase.The structure evolution rule of TWIP steel is obtained.A reasonable self consistent dynamic mechanical constitutive equation of TWIP steel under high strain rate is obtained.The dynamic TWIP effect mechanism of TWIP steel is obtained.

关 键 词：动态力学性能 高应变速率拉伸载荷 实验TWIP钢 Johnson-Cook模型 

分 类 号：TG142.12[一般工业技术—材料科学与工程]