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利用Hopkinson杆技术对经930℃下退火2h的纯铁药型罩材料进行了冲击压缩实验,测定了该材料在不同应变率下的动态应力-应变关系.借助光学显微镜对变形后纯铁的组织进行了观察,研究了在不同应变率下变形过程中纯铁的组织演变和动态应力-应变行为.研究表明:在650～3850s-1的应变率范围内,纯铁药型罩材料有显著的孪生变形,发生了明显的应变强化和应变率强化效应,且最大应变也随应变率的提高而增加;在高应变率冲击下,孪生和滑移是纯铁的主要塑性变形机制,也是纯铁高应变率增强增塑的主要机制.
The Hopkinson bar technique was used to perform the impact compression test on the pure iron-type hood material annealed at 930 ℃ for 2h, and the dynamic stress-strain relationship of the pure iron-type hood material was measured at different strain rates. The microstructure evolution and dynamic stress-strain behavior of pure iron during deformation under different strain rates were investigated. The results show that in the strain rate range of 650 ~ 3850s-1, Twin deformation and significant strain hardening and strain rate strengthening effect occurred, and the maximum strain also increased with the increase of strain rate. Under high strain rate shock, the twin and slip were the main plastic deformation mechanisms of pure iron and pure iron The main mechanism of high strain rate enhanced plasticization.