ABSTRACT Dynamic impact response of high Mn-steel at a strain rate of 3000 s−1 was investigated using the Split Hopkinson Pressure bar. The investigated steel depicted continuous yielding at high strain rates. Additionally, the yield stress displayed a positive strain-rate sensitivity with an increasing strain rate. Microstructural evaluations displayed that strain-induced martensitic transformation and dislocation multiplication during slip were dominant plastic deformation mechanisms in the absence of deformation twinning which contributes to the strain hardening. Adiabatic shear band and martensite to austenite reversion or dynamic recrystallisation were also attributed to strain softening during impact deformation. The {001}<110> R-cube, {011}<110> R-Goss, and ({111}<110>) E texture components were strengthened after impact loading compared with as-received condition, while the intensities of Cube, Cupper, Brass, and S texture components were decreased.

中文翻译：

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动态冲击载荷作用下高锰钢的显微组织和织构

摘要 使用 Split Hopkinson 压力棒研究了高锰钢在 3000 s-1 应变速率下的动态冲击响应。研究的钢描述了在高应变率下的连续屈服。此外，随着应变率的增加，屈服应力显示出正应变率敏感性。显微组织评估表明，在没有导致应变硬化的形变孪晶的情况下，滑动过程中应变引起的马氏体转变和位错增殖是主要的塑性变形机制。绝热剪切带和马氏体向奥氏体转变或动态再结晶也归因于冲击变形过程中的应变软化。{001}<110> R-cube、{011}<110> R-Goss 和 ({111}<110>