Abstract
Selective oxidation and reactive wetting during continuous galvanizing were studied for a low-alloy transformation induced plasticity (TRIP)-assisted steel with 0.2 pct C, 1.5 pct Mn, 1.0 pct Al and 0.5 pct Si. Three process atmospheres were tested during annealing prior to galvanizing: 220 K (–53 °C) dew point (dp) N2-20 pct H2, 243 K (–30 °C) dp N2-5 pct H2 and 278 K (+5 °C) dp N2-5 pct H2. The process atmosphere oxygen partial pressure affected the oxide chemistry, morphology and thickness. For the 220 K (–53 °C) dp and 243 K (–30 °C) dp process atmospheres, film and nodule-type manganese, silicon and aluminum containing oxides were observed at the surface. For the 278 K (+5 °C) dp atmosphere, MnO was observed at the grain boundaries and as thicker localized surface films. Oxide morphology, thickness and chemistry affected reactive wetting, with complete wetting being observed for the 220 K (–53 °C) dp and 243 K (–30 °C) dp process atmospheres and incomplete reactive wetting being observed for the 278 K (+5 °C) dp atmosphere. Complete reactive wetting for the 220 K (–53 °C) dp and 243 K (–30 °C) dp process atmospheres was attributed to a combination of zinc bridging of oxides, aluminothermic reduction of surface oxides and wetting of the oxides. Incomplete wetting for the 278 K (+5 °C) dp atmosphere was attributed to localized thick MnO films.
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Acknowledgments
The authors thank U.S. Steel Canada, Xstrata Zinc Canada, the Natural Sciences and Engineering Research Council of Canada (NSERC) and the members of the McMaster Steel Research Centre for their financial support. We also thank Jason Lavallée and John Thomson, McMaster Steel Research Centre, Fred Pearson and Julia Huang, Canadian Centre for Electron Microscopy, Li Sun (ArcelorMittal Dofasco) for the XPS analysis, Shihong Xu (ACSES, the Alberta Centre for Surface Engineering and Science) for the Auger analysis and the Academic User Access Facility (AUAF) program of the Materials Technology Laboratory of CANMET for fabrication of the TRIP steel used in the experiments.
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Manuscript submitted November 12, 2010.
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Bellhouse, E.M., McDermid, J.R. Selective Oxidation and Reactive Wetting During Hot-Dip Galvanizing of a 1.0 pct Al-0.5 pct Si TRIP-Assisted Steel. Metall Mater Trans A 43, 2426–2441 (2012). https://doi.org/10.1007/s11661-011-0983-6
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DOI: https://doi.org/10.1007/s11661-011-0983-6