Abstract
A transformation induced plasticity (TRIP)-assisted steel with 0.2 pct C, 1.5 pct Mn, and 1.5 pct Al was successfully galvanized using a thermal cycle previously shown to produce an excellent combination of strength and ductility. The steel surface chemistry and oxide morphology were determined as a function of process atmosphere oxygen partial pressure. For the 220 K (–53 °C) dew point (dp) + 20 pct H2 atmosphere, the oxide morphology was a mixture of films and nodules. For the 243 K (–30 °C) dp + 5 pct H2 atmosphere, nodules of MnO were found primarily at grain boundaries. For the 278 K (+5 °C) dp + 5 pct H2 atmosphere, nodules of metallic Fe were found on the surface as a result of alloy element internal oxidation. The steel surface chemistry and oxide morphology were then related to the reactive wetting behavior during continuous hot dip galvanizing. Good wetting was obtained using the two lower oxygen partial pressure process atmospheres [220 K dp and 243 K dp (–53 °C dp and –30 °C dp)]. An increase in the number of bare spots was observed when using the higher oxygen partial pressure process atmosphere (+5 °C dp) due to the increased thickness of localized oxide films.
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Acknowledgments
The authors would like to thank U.S. Steel Canada, Xstrata Zinc, 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 from the McMaster Steel Research Centre, Fred Pearson and Julia Huang from the 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 August 9, 2010.
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Bellhouse, E.M., McDermid, J.R. Selective Oxidation and Reactive Wetting during Galvanizing of a CMnAl TRIP-Assisted Steel. Metall Mater Trans A 42, 2753–2768 (2011). https://doi.org/10.1007/s11661-011-0685-0
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DOI: https://doi.org/10.1007/s11661-011-0685-0