等温处理过程热轧TRlP钢残余奥氏体的分解行为

以低Si含Al热轧TRIP钢为研究对象，采用扫描电子显微镜、透射电子显微镜、X射线衍射仪和拉伸实验等实验方法，研究了贝氏体区等温处理过程中残余奥氏体的分解行为.结果表明:在不同的等温温度下，随着等温时间的增加，残余奥氏体逐渐分解为铁素体和碳化物，随着等温温度的升高，残余奥氏体发生分解所需要的时间减少;实验钢的抗拉强度、断后延伸率和强塑积在不同的等温温度下，随着等温时间的增加呈现不断降低的变化趋势;在不同的等温处理工艺下，残余奥氏体的体积分数呈现降低的趋势，而碳含量没有明显的变化.

Decomposition Behaviors of Retained Austenite in Hot Rolled TRIP Steels During Isothermal Treatments

Scanning electron microscopy(SEM)， transmission electron microscopy(TEM)， X-ray diffraction(XRD) and tensile tests were used to investigate decomposition behaviors of the retained austenite(RA) in hot rolled TRIP steels with low Si and some Al elements during isothermal treatments. The results show that during different isothermal temperature， the RA can decompose into ferrite and carbides gradually with the isothermal time. When the isothermal temperature increases， the time required for the RA decomposition decreases. At different isothermal temperature， the variation tendency of tensile strength， total elongation and strength ductility balance of the tested steel decreases with the isothermal time. With different isothermal treatments， the variation of the volume fraction of the RA tends to be decreased， while the carbon content has little effect.