Title: Tribological and adhesion behaviour of hard alloy powder NiCrBCSi(Fe) coatings thermally sprayed on 60CrMn4 steel

Authors: S. Abdi, S. Lebaili, B. Malki

Addresses: Laboratoire des Sciences et Genie des Materiaux, FGMGP, USTHB, BP32, El-Alia, Bab Ezouar, Alger, Algerie. ' Laboratoire des Sciences et Genie des Materiaux, FGMGP, USTHB, BP32, El-Alia, Bab Ezouar, Alger, Algerie. ' Laboratoire de Science et Ingenierie des Materiaux et Proces, BP75, Domaine Universitaire, 38402 Saint Martin d'Heres, France

Abstract: This paper aims to show the relationship between, on one hand, the microstructure of deposition and post-deposition conditions, and on the other hand, the adherence and wear resistance of alloyed poly-powders nickel bases coatings thermally sprayed on a 60CrMn4 steel substrate. The adherence to steel substrate was determined using a shear test for adhesion, and the tribological behaviour of coating has been studied using a simple block-on ring tribometer. The spraying powder and coating microstructure were investigated by combination of X-ray diffraction, electron microprobe and scanning electron coupled to an analyser (EDX). Certain coating present a good adhesion and better wear resistance in the presence of bond coating and cyclic post-annealing at 650°C. That is explained by the microstructure duplexes of top coating composed the hard phase type Ni3 (BC) and the matrix bases <Nîγ> reinforced by fine Cr precipitates, improved by cyclic post-annealing.

Keywords: NiCrBCSi(Fe) coatings; nickel-aluminium bond coating; thermal spraying; post annealing; HV microhardness; adhesion; wear resistance; hard alloy powder coatings; tribology; microstructure; deposition; steel substrate.

DOI: 10.1504/IJMMP.2009.031139

International Journal of Microstructure and Materials Properties, 2009 Vol.4 No.3, pp.330 - 346

Published online: 21 Jan 2010 *

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