Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 491, Issue 1-2, Pages 39-46Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2007.12.033
Keywords
hot-dip galvanizing; TRIP-assisted steels; transmission electron microscopy; electron backscatter diffraction; selective oxidation
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TRIP-assisted steels are ideal for lightweight automotive applications due to their high strength and ductility. The selective oxidation of the alloying elements Mn, Al and Si during annealing prior to galvanizing can cause poor reactive wetting during galvanizing, resulting in bare spot defects. Despite the selective oxidation of alloying elements two high Al-low Si TRIP steels were successfully galvanized. It was determined that good reactive wetting occur-red by the presence of an Al-rich interfacial layer composed of Fe2Al5 and FeAl3. Two mechanisms by which reactive wetting occurred were identified; (1) aluminothermic reduction of MnO by the Al in the Zn bath and (2) Zn bridging of oxide particles. When aluminothermic reduction occurred there was a localized depletion of At in the Zn bath resulting in inhibition breakdown and the formation of Fe-Zn intermetallics at the Fe-Zn interface. (C) 2008 Elsevier B.V. All rights reserved.
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