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采用场发射扫描电镜和X射线衍射仪研究配分过程中低碳硅锰系Q&P钢的组织演变规律,分析残余奥氏体含量的变化规律及其与Q&P钢塑性之间的关系。结果表明:配分温度在450℃以上和配分时间在200 s以上都会使马氏体和残余奥氏体发生分解,并伴有大量的白色粒状碳化物析出。配分温度和配分时间决定室温下残余奥氏体的含量,配分温度在400℃左右和配分时间在30 s左右,配分过程中残余奥氏体中的碳含量较高,最终稳定到室温的残余奥氏体含量增加;残余奥氏体含量随着配分温度的升高呈先升高后下降的趋势,随配分时间的延长呈逐渐下降的趋势,延伸率与残余奥氏体含量的变化趋势相似。
Field emission scanning electron microscopy and X-ray diffraction were used to study the microstructure evolution of low-carbon Si-Mn Q & P steel. The variation of retained austenite content and its relationship with Q & P steel and plasticity were analyzed. The results show that the decomposition temperature of martensite and retained austenite are both above 450 ℃ and above 200 s, accompanied by a large amount of white granular carbides. Partitioning temperature and partition time determine the content of retained austenite at room temperature, the partitioning temperature is about 400 ℃ and the partitioning time is about 30 s, and the residual carbon in the retained austenite is high during the partitioning process, finally stabilizing to the residual oxygen at room temperature The content of retained austenite increases first and then decreases with the increase of the partition temperature, and gradually decreases with the extension of time. The change trend of the elongation and residual austenite content are similar.