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利用分离式霍普金斯杆技术,在旋转盘击拉伸试验机上测试了双相20Cr钢冲击拉伸应力一应变曲线,研究了应变速率及组织对动态力学性能的影响.结果表明,双相20Cr钢是一种应变速率敏感材料,在相当高应变速率下仍可保持高的初始加工硬化率并具有较大的应变速率敏感系数,正是这种特性维持了双相20Cr钢在冲击戴荷作用下的高强度、塑性水平.马氏体相的加入使体铁素体晶粒明显细化,马氏体对强度的贡献主要通过增加强化相比例和使其体铁素体相强化而获得.
The impact-stress-strain curve of two-phase 20Cr steel was tested on a rotating disk-impact tensile testing machine by using the split Hopkins lever technique. The effect of strain rate and microstructure on dynamic mechanical properties was investigated. 20Cr steel is a strain rate-sensitive material that retains high initial work-hardening at very high strain rates and has a large strain rate sensitivity that maintains the strength of the dual-phase 20Cr steel during impact on the load Under the action of the high strength and plasticity level. The addition of the martensite phase makes the ferrite grain refinement obviously. The contribution of the martensite to the strength is mainly obtained by increasing the proportion of strengthening phases and strengthening the bulk ferrite phase .