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Coincidence of strain-induced TRIP and propagative PLC bands in Medium Mn steels

机译：中锰钢中应变引起的TRIP与PLC传播带的重合

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摘要

An Fe-0.2C-5Mn-2.5Al medium manganese steel is studied for three different intercritical annealing temperatures T_(IA) to observe the effects of variations of retained austenite stability on the mechanical work hardening in uniaxial tension. Digital image correlation (DIC) showed that both Liiders bands and type A Portevin-le-Chatelier (PLC) bands occurred in samples with a lower T_(IA), but both disappeared when T_(IA) was increased. In-situ measurements of sample magnetization with a correction for stress effects on the magnetic properties of the sample allowed for continuous measurement of the retained austenite volume fraction. This method provided a complete characterization of the kinetics of transformation-induced plasticity (TRIP) in the sample over the course of tensile testing. It is shown that the martensite transformation was purely strain-induced and coincided with the passage of both Luders and PLC bands. An Olson-Cohen model was applied to magnetic data to attempt to explain the differences in TRIP kinetics with varying T_(IA).
机译：研究了Fe-0.2C-5Mn-2.5Al中锰钢在三种不同的临界退火温度T_（IA）下的变化，以观察残余奥氏体稳定性变化对单轴拉伸机械加工硬化的影响。数字图像相关性（DIC）显示Liiders带和A型Portevin-le-Chatelier（PLC）带均出现在具有较低T_（IA）的样品中，但是当T_（IA）增加时两者都消失了。对样品磁化强度的原位测量以及对样品磁性能的应力影响的校正，可以对残留奥氏体体积分数进行连续测量。该方法提供了在拉伸试验过程中样品中转变诱导可塑性（TRIP）动力学的完整表征。结果表明，马氏体转变是纯粹的应变诱导，并且与Luders和PLC带的通过同时发生。将Olson-Cohen模型应用于磁数据，以试图解释T_（IA）变化时TRIP动力学的差异。

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