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通过成分工艺优化,在传统冷轧铁素体和马氏体双相钢DP780的显微组织上引入了一定体积分数的残余奥氏体,研究了冷轧退火工艺参数对双相钢DP780的显微组织和力学性能的影响。通过调整连续退火工艺来控制显微组织中一次铁素体、二次铁素体、马氏体、残余奥氏体的比例、尺寸、形貌、分布,同时获得了连退工艺参数-显微组织-力学性能的本质关系。结果表明,通过在传统冷轧铁素体和马氏体双相钢的组织上引入了体积分数为5%~7%的残余奥氏体,不仅可以获得R_(p0.2)/R_m≤0.5的超低屈强比型冷轧DP780,也改善了成型性能。
Through the optimization of composition process, a certain volume fraction of retained austenite was introduced into the microstructure of the traditional cold-rolled ferrite and martensite dual-phase DP780. The effects of cold rolling parameters on the DP780 Effect of micro-organization and mechanical properties. By adjusting the continuous annealing process to control the microstructure of primary ferrite, secondary ferrite, martensite, retained austenite ratio, size, morphology, distribution, and get back and forth process parameters - microscopy Tissue - the nature of the mechanical properties of the relationship. The results show that not only R_ (p0.2) / R_m≤0.5 can be obtained by introducing residual austenite with the volume fraction of 5% ~ 7% into the microstructure of the traditional cold-rolled ferrite and martensite duplex steel, Of the ultra-low yield ratio cold-rolled DP780, but also improve the molding performance.