Effect of Microstructure on Stretch-flangeability of Ferrite-bainite Dual Phase Steel
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摘要: 通过对比观察不同扩孔率双相钢的显微组织,研究了铁素体贝氏体双相钢的延伸凸缘性能与组织之间的关系。试验结果表明,当显微组织由多边形铁素体和粒状贝氏体组成时,FB双相钢能达到优异的延伸凸缘性。多边形铁素体有利于扩孔率的提高而下贝氏体和板条马氏体则有害;M-A的尺寸对延伸凸缘性影响很大,随着M-A岛尺寸的减小,扩孔率逐渐增大,当M-A岛的宽度为0.7μm时,FB双相钢的扩孔率能达到120%。Abstract: The relationship between microstructure and the stretch-flangeability of F+B dual phase steels had been studied by observing the microstructure of F+B dual phase steels with different hole expansion ratio.When the microstructure consists of polygonal ferrite and granularbainite,the DP steel exhibited excellent stretch-flangeability. Polygonal ferrite is beneficial to the hole expansion ratio,while lower bainite and lath bainite play negative roles. The M-A islands in bainite have a great effect on the stretch-flangeability. As the size of M-A islands decrease,the hole expansion ratio improves. When the width of M-A islands is 0.7 μm,the hole expansion ratio of F+B steel reaches up to 120%.
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