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冷轧双相钢具有较高的抗拉强度和较低的屈强比,成形性能优异,被汽车工业广泛用于生产形状比较复杂的结构件。由于冷轧双相钢中含有较多的易氧化的合金元素如锰、硅等,因此在退火时容易出现表面色差缺陷。采用镀锌模拟器研究了退火的过时效段工艺对该缺陷的影响,分别采用扫描电镜和辉光放电光谱分析了冷轧双相钢试样的表面形貌以及元素分布。结果表明,过时效段的露点温度对表面合金元素的富集和氧化有显著影响,较高的过时效露点温度会导致出现明显的色差缺陷。
Cold-rolled dual-phase steel with high tensile strength and low yield ratio, excellent formability, the automotive industry is widely used in the production of more complex shape parts. As the cold-rolled dual-phase steel containing more easily oxidized alloying elements such as manganese, silicon, etc., so prone to surface color difference defects during annealing. The effects of annealing over-aging process on the defects were studied by galvanometer simulator. The surface morphology and elemental distribution of cold-rolled dual-phase steel samples were analyzed by scanning electron microscopy and glow discharge spectroscopy. The results show that the dew point temperature of the over-aging stage has a significant effect on the enrichment and oxidation of the surface alloying elements. The higher temperature of the overaged dew point can lead to obvious color-difference defects.