Corrosion Behavior of Multiphase Bainitic Rail Steels

Corrosion Behavior of Multiphase Bainitic Rail Steels

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Pearlitic steel experiences excessive corrosion in a hot and humid atmosphere.The multiphase bainitic/martensitic structure was developed for a better combination of strength and ductility, especially rolling contact fatigue, but little attention to corrosion has been investigated.Corrosion behaviors of multiphase steels obtained from bainitic-austempering (BAT) and luau thank you cards bainitic-quenching and -partitioning (BQ&P) processes were investigated via immersion and electrochemical tests in 3.5 wt.

% NaCl solution.The corroded surface and rust after immersion and electrochemical tests were analyzed via electron microscopy, Fourier transform infrared spectra, and x-ray diffraction.The multiphase bainite + martensite/retained austenite island showed higher corrosion resistance than that of the pearlitic one.The acicular bainite obtained from discount greenery the BQ&P process showed slightly higher corrosion resistance than the granular bainite + martensite structure obtained from the BAT process.