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Suppression of adiabatic shear band formation by martensitic transformation of retained austenite during split Hopkinson pressure bar test for a high-strength bainitic steel

机译:抑制保留奥氏体在高强度贝氏体钢中保留奥氏体的马氏体转化抑制绝热剪切带形成

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摘要

In this study, a high-strength bainitic steel was fabricated and austempered at 350 °C for 15 min, 90 min, and 24 h to control the volume fraction of retained austenite (RA) while keeping an appropriate hardness level. Their dynamic compressive properties were investigated in relation to the ASB formation and cracking by the SHPB. The specimen austempered for 90 min showed the highest volume fraction of RA along with the highest compressive properties. This specimen also possessed the high resistance to form a transformation-ASB (tASB), which was attributed to the active deformation-induced martensitic transformation of RA. Since the applied dynamic energy was consumed by the martensitic transformation as well as the ASB formation, the active transformation effectively delayed the critical strain for initiating formation. Therefore, this critical strain concept, which was well correlated with dynamic compressive properties, would be an important key factor for suppressing the ASB formation and for improving the ballistic performance.
机译:在该研究中,在350℃下制造高强度贝氏体钢15分钟,90分钟,24小时,以控制保留奥氏体(RA)的体积分数,同时保持适当的硬度水平。研究其动态压缩性能与SHPB的ASB形成和破裂研究。稳定的标本静置90分钟显示出最高体积的Ra和最高的压缩性能。该样本还具有高抗性以形成转化-SASB(TASB),其归因于RA的主动变形诱导的马氏体转化。因为所施加的动态能量由马氏体相变以及所述ASB形成耗尽时,有效的转换有效地延迟的临界应变用于发起形成。因此,这种与动态压缩性能良好相关的这种关键应变概念将是抑制ASB形成和改善弹道性能的重要关键因素。

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