通过I&Q&P处理工艺,采用SEM、XRD和拉伸试验手段,研究了低碳硅锰钢C-Si-Mn中Mn元素的配分行为及其配分工艺参数对I&Q&P处理试验钢组织与性能的影响。结果表明:经I&Q&P工艺处理,试验钢室温组织为板条状马氏体和残留奥氏体。随配分时间延长或配分温度的升高,试验钢的抗拉强度总体呈降低趋势,残留奥氏体含量均先增加后减小,伸长率与残留奥氏体量的变化趋势基本一致。800℃等温30 min,试验钢中残留奥氏体含量及伸长率最大,分别为10.02%,24.25%,该参数下的综合性能最佳。 Through the I & Q & P treatment process, the effect of the distribution of Mn in C-Si-Mn low carbon Si-Mn steel and the process parameters on the microstructure and properties of I & Q & P treated steel were studied by SEM, XRD and tensile test. The results show that the I / Q & P process results in the lamellar martensite and retained austenite at room temperature. Tensile strength of test steel decreases with the extension of time or the increase of partitioning temperature, the content of retained austenite increases first and then decreases, and the change trend of elongation and retained austenite is almost the same. 800 ℃ isothermal 30 min, the retained austenite content and elongation of the test steel were the largest, respectively 10.02%, 24.25%, the best overall performance under this parameter.