<正> 本文借助透射电镜与扫描电镜,分析了12Ni4CrMo钢于临界区热处理后显微结构的特征,并探讨显微结构的变化与改善韧性的关系。 一、试验方法 试验用钢的化学成分(wt-％)及临界点(℃)如下 C Ni Cr Mo Mn Si P S AC_1 Ac_3 0.12 4.25 1.38 0.43 0.77 0.25 0.012 0.008 670 790 钢经900℃正火后按下列工艺分别进行热处理:(1)临界区热处理:860℃ 1h,
TEM and SEM studies were carried out on the low carbon martensitic steel 12Ni4CrMo undergone intercritical heat treatment. The influence of the quenching temperature between A_(c_1)—A_(c_3) on the morphology, phase constitution as well as -196℃ CVN toughness were analyzed in comparison with the steel conventionally treated. It is suggested that the effective grain refinement, the configuration of zigzag prior austenite grain boundary and the suitable substructure are the important microstructural characteristics of the intercritically treated steel. These seem to be the main factors contributing to the optimum toughness.
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