Abstract
The present work discusses corrosion behavior of newly developed bainitic steels made by isothermal heat treatment of a new steel composition (0.71 pct C, 1.15 pct Mn, 0.20 pct Ni, 0.59 pct Cr, 0.40 pct Cu, 0.35 pct Si, 0.026 pct S, 0.027 pct P, and rest Fe (weight percent)). Corrosion behavior of the pearlitic steel made by normalization is also studied. Electrochemical polarization and salt fog tests are carried out in 0.6 M NaCl. Steel rusts after salt fog tests are analyzed. Modified composition, finer microstructures, and compact rust morphology attribute to better corrosion resistance of the bainitic steels. Corrosion mechanisms for the pearlitic and bainitic steels are discussed.
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Acknowledgments
We thank Technology Mission for Railway Safety (TMRS) under the aegis of ministry of Human Resources Development and ministry of Railways, Federal Government of India, for useful support. We express our sincere appreciation to Professor H.C Verma and his colleagues at Physics Department, IIT Kanpur, Kanpur India, for their expert help and advice in carrying out Mössbauer spectroscopy. We also thank Prof S. Suwas of IISC Bangalore for helping in electron microscopy and Prof. N. P. Gurao of IIT Kanpur for helping in image analysis.
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Manuscript submitted August 31, 2014.
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Moon, A.P., Sangal, S., Layek, S. et al. Corrosion Behavior of High-Strength Bainitic Rail Steels. Metall Mater Trans A 46, 1500–1518 (2015). https://doi.org/10.1007/s11661-014-2732-0
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DOI: https://doi.org/10.1007/s11661-014-2732-0