热轧DP600汽车用钢的微观结构特征与力学性能

朱瑞琪; 宋新莉; 郑爱琴; 陈荣东; 贾涓; 范丽霞

doi:10.13228/j.boyuan.issn0449-749x.20180084

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钢铁 ›› 2018, Vol. 53 ›› Issue (9) : 57-62. DOI: 10.13228/j.boyuan.issn0449-749x.20180084

钢铁材料

热轧DP600汽车用钢的微观结构特征与力学性能

朱瑞琪，宋新莉，郑爱琴，陈荣东，贾涓，范丽霞

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Microstructure characteristic and mechanical properties of hot rolled DP600 steel

朱瑞琪，宋新莉，郑爱琴，陈荣东，贾涓，范丽霞

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摘要

为了研究热轧DP600汽车用钢的微观结构特征及力学性能，使用扫描电子显微镜（SEM）、透射电子显微镜（TEM）等分析了试验钢的组织、夹杂物及位错结构等，借助万能拉伸试验机测试了试验钢的强度与塑性。结果表明，热轧DP600汽车用钢的组织是铁素体＋马氏体，随着应变量的增加，位错密度增加，位错缠结更为严重，在夹杂物与基体界面处、铁素体晶界处萌生微孔，马氏体发生断裂。热轧DP600试验钢的屈服强度为394.9 MPa，抗拉强度为641.6 MPa，塑性应变指数为0.154，屈强比为0.616，力学性能超过同级别的冷轧退火双相钢板指标。

Abstract

In order to research the microstructure characteristic and mechanical properties of high strength dual phase steel DP600，the strength and plasticity was measured by tensile testing machine. The microstructure and inclusion and dislocation were analyzed by scanning electron microscope and transmission electron microscope. The results showed that the ferrite and martensitic were both obtained in dual phase steel DP600. With the increase of static stretching strain，the dislocation density increased and the dislocation tangle was more serious and crack initiated at the interface of inclusions or at the grain boundary of ferrite and the crack was found in martensite island. The yield strength was 394.9 MPa，tensile strength was 641.6 MPa. Plastic strain hardening index[n]was 0.154 and yield ratio was 0.616. The mechanical properties of hot rolled DP600 steel were higher than the cold rolled and annealing dual phase steel of the same class.

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热轧双相钢 / 微观结构 / 微孔形成 / 位错

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朱瑞琪, 宋新莉, 郑爱琴, 等. 热轧DP600汽车用钢的微观结构特征与力学性能[J]. 钢铁, 2018, 53(9): 57-62 https://doi.org/10.13228/j.boyuan.issn0449-749x.20180084

ZHU Rui-Qi, SONG Xin-Li, ZHENG Ai-Qin, et al. Microstructure characteristic and mechanical properties of hot rolled DP600 steel[J]. Iron and Steel, 2018, 53(9): 57-62 https://doi.org/10.13228/j.boyuan.issn0449-749x.20180084

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