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Effect of Nb on Microstructure and Mechanical Property of High Strength Hot-Rolled Dual Phase Steel

机译：Nb对高强度热轧双相钢组织和力学性能的影响

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In according with the transformation rules of C-Si-Mn-Cr-Mo and C-Si-Mn-Cr-Mo-Nb tested steels,thermal mechanical experiment and rolling experiment of tested steels were carried out in lab.The effects of Nb on microstructure and property of high strength hot rolled dual phase steels were analyzed.It is shown that Nb retards ferrite transformation,reduces ferrite volume fraction and refines the ferrite grain size and martensite colony size.After micro-alloying of 0.047wt％Nb,yield strength and tensile strength increase by 145MPa and 135MPa respectively under medium temperature coiling process.YS/TS ratio increases from 0.51 to 0.62,meanwhile,elongation reduces from 24.8％ to 23.6％,and the decrease of elongation is not obvious.That is to say,the grain refining strengthening and precipitation strengthening of Nb micro-alloying is effective to enhance the strength grade of hot rolled DP steel coiled at medium temperature.
机译：根据C-Si-Mn-Cr-Mo和C-Si-Mn-Cr-Mo-Nb测试钢的转化规则，在实验室中进行了测试钢的热机械实验和滚动实验。NB的影响分析了高强度热轧双相钢的微观结构和性能。显示Nb延迟铁氧体转化，减少铁氧体体积分数，并改善铁氧体晶粒尺寸和马氏体菌落尺寸。微合金化的0.047wt％Nb，产量强度和拉伸强度分别在中温卷取过程中分别增加145MPa和135MPa .Y / TS比率从0.51〜0.62增加，同时伸长率从24.8％降至23.6％，伸长率下降并不明显。这是说，Nb微合金化的晶粒精制和沉淀强化强化是有效增强在中温下盘绕的热轧DP钢的强度等级。

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