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High-Rate Tensile Properties of Si-Reduced TRIP Sheet Steels

机译：硅还原TRIP钢板的高拉伸强度

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摘要

There have been efforts to develop Si-reduced TRIP steels to improve the wettability of Zn coatings, since the conventional CMnSi-TRIP steels suffer from poor galvanizability. In addition, for the development of potential applications of Si-reduced TRIP steels in vehicle crash management, a better understanding of high strain rate properties is required. In the present study, the effects of alloying elements, such as Cu, Al, Si, and P, on the high-rate tensile properties of Si-reduced TRIP sheet steels were investigated. Tensile tests were performed with a servo-hydraulic tensile testing machine at strain rates ranging from 10~(-2) to 6 X 10~2 s~(-1), and the ultimate tensile strength, elongation, strain rate sensitivity, and absorbed energy were evaluated. The retained austenite volume fractions and carbon content of the specimens were measured using neutron diffraction. The UTS was increased with Cu, Al, Si, and P alloying throughout the strain rate range, and the alloying effect on UTS was considerable with Cu and P. The effects of alloying on the microstructure were not significant. All the steels tested in this study exhibited positive strain rate sensitivity, and the m value at strain rates higher than 10 s~(-1) was at least two times higher than that at lower strain rates.
机译：由于常规的CMnSi-TRIP钢存在镀锌性差的问题，因此一直在努力开发减少Si的TRIP钢以改善Zn涂层的润湿性。另外，为了开发减少Si的TRIP钢在车辆碰撞管理中的潜在应用，需要对高应变速率特性有更好的了解。在本研究中，研究了合金元素（如Cu，Al，Si和P）对Si还原的TRIP钢板的高倍率拉伸性能的影响。使用伺服液压拉伸试验机在10〜（-2）至6 X 10〜2 s〜（-1）的应变速率下进行拉伸试验，并测定极限拉伸强度，伸长率，应变速率敏感性和吸收评估能量。使用中子衍射法测量样品的残余奥氏体体积分数和碳含量。在整个应变速率范围内，Cu，Al，Si和P合金化都会使UTS升高，而Cu和P合金对UTS的合金化效果则非常显着。合金化对显微组织的影响并不显着。在这项研究中测试的所有钢都表现出正应变率敏感性，并且应变率高于10 s〜（-1）时的m值至少比应变率低时的m值高两倍。

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