双相钢的力学性能和对成形极限的影响

发布时间：2018-07-02 23:56

本文选题：冷轧双相钢 + 力学性能　；参考：《机械工程学报》2017年12期

【摘要】：对两个来自不同生产线的冷轧双相钢DP780试样的主要力学性能进行比较,发现相同牌号的DP钢产品性能有显著差异。建立拉伸过程的有限元模型,将拉伸试验和有限元仿真相结合,利用材料失效点主应变二次导数的变化规律准确预测DP780在拉伸过程中的缩颈和破裂。研究发现相同牌号的DP钢产品成形极限亦有明显不同。最后从延伸长度和极限应变两方面定量分析应变强化指数n值和强度系数K值的变化对拉伸过程成形极限的影响。发现应变强化指数n值的变化对成形极限影响较大,强度系数K值的变化对成形极限影响较小。增大n值可以提高发生缩颈和破裂时的延伸长度和极限应变。
[Abstract]:The main mechanical properties of two cold-rolled double-phase steel DP780 samples from different production lines were compared and it was found that there were significant differences in the mechanical properties of DP steel products of the same grade. The finite element model of the tensile process is established. By combining the tensile test with the finite element simulation, the necking and fracture of DP780 during the tensile process is accurately predicted by using the variation law of the second derivative of the main strain at the failure point of the material. It is found that the forming limit of DP steel with the same grade is also different. Finally, the effects of strain strengthening exponent n and strength coefficient K on the forming limit of tensile process are analyzed quantitatively from the two aspects of extension length and ultimate strain. It is found that the variation of strain strengthening exponent n has a great influence on the forming limit, while the change of strength coefficient K has little effect on the forming limit. The extension length and ultimate strain of necking and rupture can be increased by increasing n value.
【作者单位】：北京科技大学机械工程学院;
【基金】：国家十二五科技支撑计划资助项目(2015BAF30B01)
【分类号】：TG142.1

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