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200s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.
Microstructure evolution of low carbon Si-Mn Q&P steel during partitioning had been investigated by means of SEM and X-ray diffraction,and variation of retained austenite content and its effects on the plasticity of Q&P steel had been characterized.The results show that partition temperature above 450 ℃ and the partition time longer than 200 s cause martensite and retained austenite decomposition,at same time lots of white granular carbide precipitate.The partition temperature and partition time determine the content of residual austenite at room temperature.When partition temperature is about 400 ℃ and partition time is about 30 s,carbon content of retained austenite is higher during partition process,and the content of residual austenite at room temperature increase.With increasing partition temperature,content of residual austenite increases at first and then decreases,while it gradually decreases with the extension of partition time.Elongation and residual austenite content show similar change trend.
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