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Characterisation of the high strain rate properties of Advanced High Strength Steels

机译：高强度钢材高应变率特性的表征

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In the automotive industry a lot of energy is put into the development of lightweight auto body structures that are able to outperform the classic structures. For these purposes tremendous advances have been made in the field of multi-phase steels. Complex steel grades have been developed with exceptional mechanical properties: they combine high strength values (yield strength, tensile strength, etc.) with an excellent ductility. TRIP steels (TRansformation Induced Plasticity steels) show these properties pre-eminently. To guarantee a controlled dissipation of the energy released during a crash, knowledge and understanding of the impact-dynamic material properties is essential. In this paper the results are presented of an extensive experimental program to investigate the strain rate dependent mechanical properties of different TRIP steels. The influence of different alloying types (Al, Si, SiAl, etc.) on the static and dynamic stress-strain behaviour is investigated. A split Hopkinson tensile bar set-up was used for the experiments. Microstructural observation techniques such as different optical methods, SEM and XRD were used to reveal the mechanisms governing the observed high strain rate behaviour. From the results it is clear that the excellent mechanical properties are not only preserved at higher strain rates, but still improve. The influence of the alloying elements is comparable in the static and dynamic case: aluminium tends to increase the elongation level of the material, whereas silicon improves the stress that is achieved.
机译：在汽车行业中，大量的能量被投入了轻质汽车体结构的开发，能够优于经典结构。对于这些目的，已经在多相钢领域进行了巨大进步。复杂的钢等级具有出色的机械性能：它们将高强度值（屈服强度，抗拉强度等）结合出优异的延展性。跳钢（转化诱导的可塑性钢）预先显示这些性质。为了保证在碰撞期间释放的能量的受控耗散，知识和对抗动态材料特性的了解至关重要。本文提出了一种广泛的实验计划，以研究不同绊脚钢的应变率依赖性机械性能。研究了各种合金类型（Al，Si，Sial等）对静态和动态应力 - 应变行为的影响。拆分霍普金森拉伸棒设置用于实验。用于不同光学方法，SEM和XRD的微结构观察技术用于揭示针对观察到的高应变率行为的机制。从结果中显然，优异的机械性能不仅以较高的应变率保存，而且仍然改善。合金元件的影响在静态和动态壳体中可比：铝倾向于增加材料的伸长水平，而硅改善了所达到的应力。

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