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通过热轧厂实际生产试制,研究了钛、铌微合金元素对600 MPa级低成本低温卷取型铁素体/马氏体双相钢组织和性能的影响,并与同强度级别中温卷取双相钢进行对比。研究结果表明,沿晶界分布的纳米级(Nb,Ti)C第二相显著细化了铁素体/马氏体两相组织,由此解决了不含钛、铌元素的低温卷取双相钢马氏体岛粗大的问题,提高其强度和塑性。此外,试制生产对比发现,中温卷取双相钢存在晶粒尺寸较粗,马氏体体积分数较少,强度相对略低等特征,并提出了相应的热轧工艺改进思路。
Through the trial production of hot rolling mill, the effects of microalloyed titanium and niobium on the microstructure and properties of 600 MPa low cost and low temperature coiled ferrite / martensite dual phase steel were studied and compared with the same strength grade Duplex steel for comparison. The results show that the second phase of nanocrystalline (Nb, Ti) C distributed along the grain boundaries significantly refine the ferrite / martensite two-phase microstructure, thus solving the low temperature coiling double Phase steel martensite island coarse problems, improve its strength and plasticity. In addition, the trial production comparison found that the temperature coiling dual phase steel coarser grain size, martensite volume fraction less strength is relatively low and so on, and the corresponding hot rolling process to improve ideas.