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利用EBSD,HRTEM与热膨胀仪等实验手段对低碳中锰钢在淬火+回火(QT)与淬火+片状淬火+回火(QLT)工艺下的奥氏体形貌与相变过程进行了对比分析.结果表明,QT与QLT工艺下所生成的回转奥氏体形貌、尺寸、位置以及由此导致的奥氏体稳定性差异是造成实验钢力学性能特别是低温冲击韧性巨大差异的最主要原因.热力学与动力学分析表明,由于QLT工艺在淬火+片状淬火(QL)阶段完成了C和Mn元素的第一次配分,因而相比于QT热处理工艺,QLT工艺下回转奥氏体在生成速率显著提高的同时其生长模型也由一维双向增厚模式演变成一维单向增厚模式.
The morphology and phase transformation of austenite in low carbon medium manganese steel under the condition of quenching and tempering (QT) and quenching + sheet quenching and tempering (QLT) were studied by means of EBSD, HRTEM and thermal dilatometer The results show that the morphology, size and position of austenite produced by QT and QLT process are the most significant differences in the mechanical properties of experimental steel, especially the low temperature impact toughness The main reason is that thermodynamics and kinetics analysis show that the QLT process is better than that of the QT heat treatment process because the QLT process completes the first partitioning of the C and Mn elements during the QL quenching and quenching (QL) Its growth model evolves from one-dimensional two-way thickening mode to one-dimensional one-way thickening mode at the same time that its growth rate is significantly increased.