Improving the Sheared-edge Formability of High Strength Dual-phase Steel
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摘要: 双相钢具有高强度的同时表现出良好的成形性能,因而被广泛应用。这类钢具有高的n值、均匀伸长率和总伸长率,不过,限制高强度双相钢应用的因素之一是在冲裁边部拉延过程中出现失效。为了开发具有良好冲裁边部塑性的高强双相钢,必须精心控制组织中硬相和软相的比例和硬度。冲裁边部拉延时出现的失效机制与微观组织密切相关(不同相的比例、硬度、尺寸和分布),发现在铁素体-马氏体界面出现裂纹萌生。研究了退火前的条件(热轧和冷轧条件)、不同的连续镀锌线工艺过程以及合金化元素对双相钢冲裁边部成形性能的影响,发现所有这三个参数都对扩孔试验中测定的冲裁边部塑性产生强烈影响。Abstract: Dual phase steels are commercially attractive since they offer good formability at a high strength.These steels exhibit high n-values and high uniform and total tensile elongations. However,one limitation in the application of high strength dual phase steels is failure during sheared edge stretching.In order to develop high strength dual phase steels with improved sheared edge ductility,the amount and hardness of both the hard and soft constituents must be carefully controlled. The failure mechanism observed during stretching of the sheared edge is closely related to the microstructures(i.e.amounts,hardness,size and distribution of different phases),and the initiation of cracks were found to start at ferritemartensite interfaces which will be discussed in this study.In the present research,the effects of pre-annealing conditions(hot and cold rolling),different CGL processing paths and alloying elements on the sheared edge formability of dual phase steels have been studied. It has been found that all three of these variables can exert a strong influence of sheared edge ductility as determined in the hole expansion test.
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