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采用场发射SEM及TEM研究了含磷高强IF钢拉矫断带的断口形貌及析出物的分布状态,结果表明导致断带的主要原因是晶界处大尺寸、树枝状Fe(Nb,Ti)P相的偏聚析出。通过对断带样品的热处理回溶试验及不同层冷冷速的热模拟试验,分析了造成Fe(Nb,Ti)P相晶界富集析出的温度范围及工艺要素。在机制研究的基础上,制定了热轧生产的控制要点,主要包括轧制温度、层冷冷速、成分设计、卷取温度等多个方面,成功抑制了高P类高强IF钢的拉矫断带事故发生率。
The field emission SEM and TEM were used to study the fracture morphology and the distribution of the precipitates in the high strength IF steel. The results show that the main cause of the fault is the large size of the grain boundaries, dendritic Fe (Nb, Ti ) P-phase segregation. The temperature range and technological factors for the enrichment and precipitation of Fe (Nb, Ti) P phase boundaries were analyzed by means of heat treatment and backwashing of the broken samples and thermal simulation tests of cooling rates in different layers. On the basis of the mechanism research, the control points of hot rolling production are formulated, including the rolling temperature, the cooling rate of the layer cooling, the composition design and the coiling temperature. The successful suppression of the high P type high strength IF steel straightening Broken belt accident rate.