组织形貌对热轧双相钢力学行为影响

Effects of Microstructures on Mechanical Behavior of Dual-Phases Steel

摘要: 采用550小轧机进行了实验室轧制实验，通过改变冷却工艺改变双相钢显微组织中铁素体和马氏体形貌和分布，研究了铁素体和马氏体形貌和分布对钢力学行为的影响。实验结果表明，当组织中的铁素体由多边形铁素体部分转变为针状铁素体时，马氏体的尺寸变小且分布更为均匀。此时，钢的屈服强度和抗拉强度明显提高，延伸率略有下降，冲击性能明显提高。

Abstract: The ingots were rolled by 550 mills in laboratory and the different shapes and distributions of ferrite and martensite were obtained by changing the cooling process. The influence of the shape and distribution of ferrite and martensite on mechanical properties of dual phase steel was investigated. The results indicated that, the size of martensite is finer, and the distribution of martensite is more homogeneous in steel with the microstructure was mixed by polygonal ferrite, acicular ferrite and martensite than that of steel with the microstructure mixed by polygonal ferrite and martensite. Moreover, the values of yield strength, tensile strength and impact toughness increase apparently, the value of elongation decreases.