(1. Special Steel Technology Department, Shougang Technology Research Institute, Beijing 100043, China
2. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology, Beijing 100043, China
3. National Engineering Laboratory of Advanced Coating Technology for Metal Materials, China Iron and Steel Research Institute Group, Beijing 100081, China
4. Beijing Shougang Cold Rolled Sheet Co., Ltd., Beijing 101304, China
5. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China)
Abstract:With high strength and low yield-tensile ratio, dual phase steel has been applied to manufacture structural parts with complex geometry in automobile industry as good forming property. Due to large amount of alloying elements tended to be oxidized, such as manganese and silicon, contained in the dual phase steel, color difference defect is apt to appear during annealing. In this study, influence of over-aging processes on the defect was studied with a hot-dip process simulator. The surface micrograph and element depth profile of the dual phase steel samples were investigated by means of scanning electron microscopy (SEM) and glow discharge optical emission spectroscopy (GDOES), respectively. The results indicate that the dew point during over-aging remarkably affects the microstructure and enrichment of alloying elements on the surface. Higher dew point during over-aging results in severe color difference defect.
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JIANG Guang-rui,,CHEN Ling-feng,WANG Hai-quan,,LIU Jin-sheng,LIU Li-bin,5. Influence of over-aging dew point on surface color difference of dual phase steel. Iron and Steel, 2017, 52(8): 87-91.
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