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首页> 外文期刊>Materials Science and Engineering >Strengthening mechanisms in ultrafine-grained ferritic/martensitic steel produced by equal channel angular pressing
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Strengthening mechanisms in ultrafine-grained ferritic/martensitic steel produced by equal channel angular pressing

机译：等通道角压制超细晶粒铁素体/马氏体钢的强化机理

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Microstructure and thermal stability of high chromium ferritic/martensitic steel 12Cr-2W-2Ni-0.5Mo processed by equal channel angular pressing (ECAP) has been investigated using electron back scattering diffraction (EBSD) and transmission electron microscopy. Volume fraction of alpha' martensite, the values of lattice parameter, dislocation density and a size of coherent scattering domains were determined using X-ray technique in conventional reflection mode. Phase composition and volume fraction of precipitates was investigated using transmission X-ray diffraction. Tensile tests were used to estimate the mechanical properties. The contribution of strengthening mechanisms to yield stress of steel is discussed. It was demonstrated that the ECAP processing in the ferrite region with subsequent quenching from the austenite region leads to both the formation of homogeneous UFG structure and the increase of a number of boundaries with the coincidence site lattice (CSL) relationships (the CSL boundaries) in ferritic/martensitic steel providing the enhanced mechanical properties.
机译：利用电子背散射衍射（EBSD）和透射电子显微镜研究了等通道角向压制（ECAP）处理的高铬铁素体/马氏体钢12Cr-2W-2Ni-0.5Mo的组织和热稳定性。在常规反射模式下使用X射线技术确定α'马氏体的体积分数，晶格参数值，位错密度和相干散射域的大小。使用透射X射线衍射研究沉淀的相组成和体积分数。拉伸试验用于估计机械性能。讨论了强化机制对钢屈服应力的贡献。结果表明，在铁素体区进行ECAP加工，随后从奥氏体区淬火，不仅会导致均质UFG结构的形成，而且还会增加具有重合点晶格（CSL）关系的边界数量（CSL边界）。铁素体/马氏体钢提供增强的机械性能。

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