高应变速率冲击条件下Fe-Mn-C TWIP钢的力学性能  

Mechanical behavior of Fe-Mn-C TWIP steel under high strain rate impact loading

作　　者：高永亮[1] 胡士廉[1] 陈巍[1] 田雨江[1] 杨阳[1] 孙国进[1] 贺勇[1] 

机构地区：[1]中国兵器科学研究院宁波分院,浙江宁波315103

出　　处：《材料热处理学报》2015年第9期119-123,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51401183)

摘　　要：采用Hopkinson压杆对实验Fe-Mn-C TWIP钢进行了高应变速率（1202~2532 s-1）下的动态力学性能测试。结果表明：实验TWIP钢具有较为明显的应变速率效应,随应变速率的提高材料的强度和塑性均增加;随应变速率的提高材料的能量吸收值也随之增加。结合准静态压缩（0.001 s-1）实验数据,优化拟合了Johnson-Cook模型中的各参数,获得了材料的动态力学本构方程,拟合结果与实验结果具有较高的一致性。Mechanical properties of Fe-Mn-C of twinning induced plasticity（ TWIP） steel were investigated under wide range of strain rates from 0. 001 to 2532 s- 1,with an emphasis on the high strain rates. The results show that the TWIP steel has a positive strain rate sensitivity under high strain rate conditions. With increasing strain rate,the strength and plasticity of the steel increase; the value of the specific energy absorption of the TWIP steel increases too. Combined with the Quasi-static compression experimental data,the parameters of the Johnson-Cook model of dynamic mechanical constitutive equation of the TWIP steel are optimized,a self-consistent description of the constitutive equation is obtained.

关 键 词：Fe-Mn-CTWIP钢 动态力学性能 高应变速率 Johnson-Cook模型 能量耗散值 

分 类 号：TG142.7[一般工业技术—材料科学与工程]