Corrosion Behavior of Multiphase Bainitic Rail Steels

Tanaporn Rojhirunsakool; Thammaporn Thublaor; Mohammad Hassan Shirani Bidabadi; Somrerk Chandra-ambhorn; Zhigang Yang; Guhui Gao

doi:10.3390/met12040694

Metals (Apr 2022)

Corrosion Behavior of Multiphase Bainitic Rail Steels

Tanaporn Rojhirunsakool,
Thammaporn Thublaor,
Mohammad Hassan Shirani Bidabadi,
Somrerk Chandra-ambhorn,
Zhigang Yang,
Guhui Gao

Affiliations

Tanaporn Rojhirunsakool: High Temperature Corrosion Research Centre, Department of Materials and Production Technology Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
Thammaporn Thublaor: High Temperature Corrosion Research Centre, Department of Materials and Production Technology Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
Mohammad Hassan Shirani Bidabadi: High Temperature Corrosion Research Centre, Department of Materials and Production Technology Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
Somrerk Chandra-ambhorn: High Temperature Corrosion Research Centre, Department of Materials and Production Technology Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
Zhigang Yang: Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Guhui Gao: Material Science & Engineering Research Center, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China

DOI: https://doi.org/10.3390/met12040694
Journal volume & issue: Vol. 12, no. 4
p. 694

Abstract

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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 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 the BQ&P process showed slightly higher corrosion resistance than the granular bainite + martensite structure obtained from the BAT process.

Published in Metals

ISSN: 2075-4701 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Mining engineering. Metallurgy
Website: http://www.mdpi.com/journal/metals

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