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首页> 外文OA文献 >Investigating the Difference in Mechanical Stability of Retained Austenite in Bainitic and Martensitic High-Carbon Bearing Steels using in situ Neutron Diffraction and Crystal Plasticity Modeling
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Investigating the Difference in Mechanical Stability of Retained Austenite in Bainitic and Martensitic High-Carbon Bearing Steels using in situ Neutron Diffraction and Crystal Plasticity Modeling

机译：用原位中子衍射和晶体塑性建模研究贝氏体和马氏体高碳轴承钢中保留奥氏体的机械稳定性差异

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In situ neutron diffraction of the uniaxial tension test was used to study the effect of the surrounding matrix microstructure on the mechanical stability of retained austenite in high-carbon bearing steels. Comparing the samples with bainitic microstructures to those with martensitic ones, it was found that the retained austenite in a bainitic matrix starts transforming into martensite at a lower strain compared to that within a martensitic matrix. On the other hand, the rate of transformation of the austenite was found to be higher within a martensitic microstructure. Crystal plasticity modeling was used to analyze the transformation phenomenon in these two microstructures and determine the effect of the surrounding microstructure on elastic, plastic, and transformation components of the strain. The results showed that the predominant difference in the deformation accumulated was from the transformation strain and the critical transformation driving force within the two microstructures. The retained austenite was more stable for identical loading conditions in case of martensitic matrix compared to the bainitic one. It was also observed that the initial volume fraction of retained austenite within the bainitic matrix would alter the onset of transformation to martensite, but not the rate of transformation.
机译：原位中子衍射单轴张力试验用于研究周围基质微观结构对高碳轴承钢保持奥氏体的机械稳定性的影响。将样品与马氏体中的贝氏体微结构进行比较，发现与马氏体基质内的贝氏体基质中的保留奥氏体在较低菌株中开始转化成马氏体。另一方面，发现奥氏体的转化率在马氏体微观结构中更高。晶体塑性建模用于分析这两个微观结构中的转化现象，并确定周围微观结构对应变的弹性，塑料和转化组分的影响。结果表明，累积的变形中的主要差异来自转化应变和两个微结构内的临界变换驱动力。对于与贝氏体矩阵相比，在马氏体基质的情况下，保留的奥氏体对于相同的负载条件更稳定。还观察到，贝氏体基质内保留奥氏体的初始体积分数将改变转化的转化发作，但不是转化率。

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