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High Temperature Tensile Properties and Related Microstructural Evolution in Grade 92 Steel

机译：92级钢的高温拉伸性能及相关的组织演变

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Ferritic-martensitic steels with good high temperature mechanical properties have many promising applications in fossil and nuclear power plants. In this work, a F92 steel was tensile tested from room to elevated temperatures (up to 700 ℃). This material exhibited higher strength than traditional P92 steels. The reasons for the observed changes in mechanical properties were investigated by studying the microstructural characteristics in undeformed and deformed specimens using transmission electron microscopy. The microstructural evolution accelerated significantly under loading as temperature increased. For instance, the deformed microstructure at 600 ℃ showed early stages of M_(23)C_6 precipitate formation under loading. The M_(23)C_6 precipitates exhibited more coarsening tendency whereas the MX-type precipitates retained their size. As coarsening of M_(23)C_6 precipitates progressed at elevated temperatures, the strength gradually decreased as the solid solution strengthening deteriorated by removing W and Mo from the solid solution matrix.
机译：具有良好高温机械性能的铁素体-马氏体钢在化石和核电厂中具有许多有希望的应用。在这项工作中，对F92钢进行了从室温到高温（最高700℃）的拉伸测试。这种材料比传统的P92钢具有更高的强度。通过使用透射电子显微镜研究未变形和变形样品的微观结构特征，研究了观察到的机械性能变化的原因。随着温度的升高，在载荷作用下，显微组织的演化明显加快。例如，在600℃下变形的显微组织显示出在加载下M_（23）C_6沉淀形成的早期阶段。 M_（23）C_6沉淀物表现出更大的粗化趋势，而MX型沉淀物保持其尺寸。随着在高温下析出的M_（23）C_6析出物粗化，随着从固溶体中除去W和Mo而使固溶强化变差，强度逐渐降低。

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