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A study of the wear performance of duplex treated commercial low-alloy steel against alumina and WC balls

Article dans une revue avec comité de lecture
Author
ccNASSER EDDINE, BELIARDOUH
NOUVEAU, Corinne
127742 Laboratoire Bourguignon des Matériaux et Procédés [LABOMAP]
WALOCK, Michael J.
JACQUET, Philippe

URI
http://hdl.handle.net/10985/10086
DOI
10.1016/j.surfcoat.2014.10.042
Date
2014
Journal
Surface and Coatings Technology

Abstract

The objective of this work is to study the improvement of the tribological properties of low alloy steel using a duplex treatment of lowpressure carburizing and the deposition of a Cr–(WC–Co) coating by dual RF magnetron sputtering. The treatments result in a 500 μm thick carburized layer and a sputtered coating thickness of ~2 μm. Tribological tests were made with a ball-on-disk tribometer under dry conditions with low load and low speed. The worn surfaces of the disk, the wear counterpart, and resulting debris were analyzed by X-ray diffraction, optical microscopy, optical profilometry, and a scanning electron microscope equipped with an energy-dispersive X-ray spectrometer. The wear performance of the samples was evaluated in terms of wear rates and friction oefficients during the sliding processes against two different counterparts. Experimental results have shown that sliding wear, of the investigated duplex treated low alloy steels, is strongly dependent on the counterface materials. Under testing conditions, the overallwear performance of a Cr–WCcoating (Cr/Wratio of 1.12:1) deposited onto the surface of a carburized lowalloy steel (0.61wt.% C; HV=654±5) can be recommended as the best. The duplex-treated samples suffered severe, concentrated wear when against alumina. Thiswear is characterized by a combination of delamination, mild abrasion and oxidative wear. However, the wear mechanism seems to be oxidative and adhesive when against WC balls.

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