Tribocorrosion behavior of boronized AISI 4140 steel

In this study, AISI 4140 steel was boronized using powder-pack‑boronizing process, seeking to produce a monophasic iron boride (Fe2B) layer. The microstructural and chemical characteristics were evaluated by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), respectively and G...

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Bibliographic Details
Published in:Surface & coatings technology 2018-10, Vol.352, p.265-272
Main Authors: da Costa Aichholz, Steffen Alexandre, Sostag Meruvia, Michelle, Soares Júnior, Paulo César, Torres, Ricardo Diego
Format: Article
Language:English
Subjects:
AISI 4140
Boron
Boronizing
Chromium molybdenum steels
Coefficient of friction
Corrosion
Fe2B
High strength steels
Indentation
Mechanical properties
Open circuit voltage
Organic chemistry
Scanning electron microscopy
Sodium chloride
Steel
Tribocorrosion
Tribology
Wear
Wear rate
X ray spectra
X-ray diffraction
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Summary:In this study, AISI 4140 steel was boronized using powder-pack‑boronizing process, seeking to produce a monophasic iron boride (Fe2B) layer. The microstructural and chemical characteristics were evaluated by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), respectively and Grazing incidence X-ray diffraction (GIXRD). Mechanical behavior was probed by instrumented indentation while tribological behavior was determined through pin-on-disc tests. For the pin-on-disc tests, two condition were evaluated, dry condition and also immersed in 3.5% NaCl solution, which was connected to a potentiostat, monitoring the open circuit potential (OCP). The single Fe2B layer was indeed obtained with a thickness around 42μm. The iron boride layer showed significantly lower wear rate and also lower coefficient of friction (COF) during tribocorrosion tests, in comparison with unboronized specimens. An opposite behavior was verified during dry tribological tests, where unboronized samples presented lower COF behavior. •Formation of a single phase iron boride (Fe2B) layer on AISI 4140 steel.•Tribocorrosion evaluation of boronized and unboronized layer on AISI 4140 steel.•Low wear rates values shown by the boronized layer in dry tribological condition and in tribocorrosion.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2018.07.101