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在Gleeble 3800热模拟机上进行低碳Si-Mn系Q&P钢的热处理模拟,采用X射线衍射仪和透射电子显微镜研究了热处理后试样中残余奥氏体的量及其分布规律。XRD研究表明:Q&P钢中残余奥氏体的存在提高了钢的塑性;Q&P工艺中较高的配分温度和较长的配分时间可以得到较多的残余奥氏体。透射电镜观察表明Q&P钢中残余奥氏体形态有马氏体板条间条状奥氏体和晶界处块状奥氏体两种。
The heat treatment simulations of low carbon Si-Mn Q & P steel were carried out on a Gleeble 3800 thermal simulator. The amount of retained austenite and its distribution in the samples after heat treatment were investigated by X-ray diffraction and transmission electron microscopy. XRD results show that the presence of retained austenite in Q & P steel improves the ductility of steel. Higher residual temperature and longer dosing time can result in more retained austenite in Q & P process. Transmission electron microscopy showed that the residual austenite in Q & P steel was composed of martensite lath austenite and massive austenite at the grain boundary.