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Research Papers: Friction and Wear

Duplex Surface Treatment of AISI 1045 Steel Via Pack Boriding and Plasma Nitriding: Characterization and Tribological Studies

[+] Author and Article Information
Ali Habibolahzadeh

Department of Materials and
Metallurgical Engineering,
Semnan University,
Semnan 19111-35131, Iran
e-mail: ahabibolahzadeh@semnan.ac.ir

Farahnaz Haftlang

Department of Materials and
Metallurgical Engineering,
Semnan University,
Semnan 19111-35131, Iran
e-mail: f.haftlang@yahoo.com

1Corresponding authors.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 16, 2017; final manuscript received June 28, 2017; published online September 26, 2017. Assoc. Editor: Nuria Espallargas.

J. Tribol 140(2), 021602 (Sep 26, 2017) (5 pages) Paper No: TRIB-17-1136; doi: 10.1115/1.4037465 History: Received April 16, 2017; Revised June 28, 2017

For the first time, formation of cubic boron nitride (c-BN), besides Fe2B and iron nitrides, was detected in boronitride coating, which was applied via a duplex diffusional surface treatment. Boronitride coating was applied on AISI 1045 steel substrates via duplex treatment of pack boriding and plasma nitriding (B-PN). Scanning electron microscope (SEM), X-ray diffractometer (XRD), and pin-on-disk wear test were utilized to evaluate microstructures, phases, and wear properties of the coatings. The surface of the as-coated sample exhibited a pebblelike and compact structure, and the cross-sectional morphology of the coatings showed a saw-tooth interface with substrate. Duplex treated sample revealed superior wear resistance in comparison with the borided one.

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Figures

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Fig. 1

SEM surface topolographs and XRD pattern of (a) and (b) pack boriding and (c) and (d) B-PN samples, respectively

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Fig. 2

Saw-tooth morphologies of (a) pack boriding and (b) B-PN layers at surface of AISI 1045 steel

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Fig. 3

Plots of friction coefficients versus sliding distance for various samples at applied load of 20 N

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Fig. 4

SEM images of the worn surfaces of (a) and (b) boriding and (c) and (d) B-PN samples in different magnification

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