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采用EMPA,SEM和XRD等手段,研究低碳硅锰钢在双相区保温淬火(I&Q)、双相区保温+奥氏体化+盐浴配分(I&Q&P)和奥氏体化+盐浴配分(Q&P)工艺中的C,Mn元素配分行为及对残余奥氏体的综合作用。结果表明:经I&Q工艺处理后,得到马氏体、铁素体加少量残余奥氏体混合组织,C,Mn在马氏体中出现了富集,并且C富集程度高于Mn;经I&Q&P工艺处理后,C,Mn在板条马氏体中呈现不均匀分布,C的局部富集现象更明显,按C,Mn含量的不同,马氏体可分为“高C高Mn”、“高C低Mn”和“低C低Mn”3种;相比较Q&P工艺中只有C配分作用稳定残余奥氏体,I&Q&P工艺在C,Mn配分综合作用下,能得到更多的残余奥氏体。
The effects of I / Q, dual phase insulation + austenitization + salt bath partitioning (I & Q & P) and austenitization + salt bathing on low carbon Si-Mn steels were studied by means of EMPA, SEM and XRD. (Q & P) process of C, Mn elemental partitioning behavior and the combined effect of retained austenite. The results show that martensite and ferrite plus a small amount of retained austenite mixed structure are obtained after I & Q process treatment. C and Mn are enriched in martensite, and C is enriched more than Mn. After I & Q & P After processing, C and Mn are unevenly distributed in lath martensite, and the local enrichment of C is more obvious. According to the difference of C and Mn contents, martensite can be divided into “high C high Mn” , “High C low Mn” and “low C low Mn”. Compared with the Q & P process, only C has a stable residual austenite, and the I & Q & P process can get even more under the combined action of C and Mn More residual austenite.