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首页> 外文期刊>ISIJ international >Tempering kinetics of the martensitic phase in DP steel
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Tempering kinetics of the martensitic phase in DP steel

机译：DP钢中马氏体相的回火动力学

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摘要

The increase in the yield stress of dual phase (DP) steels, resulting from the static strain ageing phenomenon, commonly referred to as bake hardening (BH), gives an important contribution to the additional in-service strength of outer auto body parts, e.g. with respect to the dent resistance of the components made with DP steel. In order to understand this large BH effect, the role of the different constituents of the DP steel during this process needs to be considered. The various stages of tempering phenomena taking place in the martensite phase were investigated in detail by means of precision dilatometry and X-Ray Diffraction (XRD). The succession of the various tempering reactions that are characterised by typical volume changes was determined using both constant heating rate and isothermal dilatometric tests. The measurements made it possible to distinguish five distinct stages of structural changes during tempering: (I) the redistribution of carbon atoms, (II) the precipitation of eat- or epsilon-carbide, (III) the formation of Hagg-carbide, (IV) the decomposition of retained austenite, and (V) the transformation of transition carbides to cementite.
机译：由静态应变时效现象（通常称为烘烤硬化（BH））引起的双相（DP）钢屈服应力的增加，对增加车身外部零件的工作强度做出了重要贡献，例如，关于用DP钢制成的组件的抗压痕性。为了理解这种大的BH效应，需要考虑DP钢的不同成分在此过程中的作用。马氏体相中回火现象的各个阶段都通过精密膨胀法和X射线衍射（XRD）进行了详细研究。使用恒定的加热速率和等温膨胀试验，确定了以典型的体积变化为特征的各种回火反应的顺序。这些测量结果可以区分回火过程中结构变化的五个不同阶段：（I）碳原子的重新分布，（II）eat碳化物或ε-碳化物的沉淀，（III）Hagg碳化物的形成，（IV ）残余奥氏体的分解，以及（V）过渡碳化物向渗碳体的转变。

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