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对3 mm厚的DC04冷轧IF钢板进行搅拌摩擦加工,研究加工区域的微观组织与力学性能.在旋转速度为950 r·min-1,加工速度为60 mm·min-1时,采用加工后强制冷却技术可获得光滑平整且没有缺陷的加工表面.搅拌摩擦加工后组织显著细化,加工中心的平均显微硬度约为HV 135.6,是母材硬度的1.4倍,表面细晶层硬度最高可达到HV 312.8,细晶层和过渡层的抗拉强度分别比母材的抗拉强度提高50.9%和47.6%,加工前后试样的拉伸断口均呈微孔聚合韧性断裂特征.细晶强化对材料抗拉强度的提高起主要作用.
The 3 mm-thick cold-rolled DC04 cold-rolled IF steel was subjected to friction stir processing to study the microstructure and mechanical properties of the machined area.When the working speed was 60 mm · min-1 and the rotational speed was 950 r · min-1, Forced cooling technology can get a smooth smooth surface and no defects in the processing surface.Rubber friction processing organization significantly refined, the average microhardness of the processing center is about HV 135.6, is 1.4 times the hardness of the base metal, the surface of the fine crystal layer can be the highest hardness When HV 312.8 was reached, the tensile strength of the fine grained layer and the transition layer increased by 50.9% and 47.6%, respectively, compared with the tensile strength of the base metal. The tensile fracture of the samples before and after processing showed microporous polymeric ductile fracture characteristics. Tensile strength of materials plays a major role.