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Wear 350-351 (2016) 82–88
Contents lists available at ScienceDirect
Wear
journal homepage: /locate/wear
In?uence of TiN coating thickness on the rolling contact fatigue resistance of austempered ductile iron
Diego Alejandro Colombo a,b,n, María Dolores Echeverría a,b, Ricardo Cesar Dommarco b, Juan Miguel Massone b
a Mechanical Technology Group, School of Engineering, Universidad Nacional de Mar del Plata, Av. J. B. Justo 4302, B7608FDQ Mar del Plata, Argentina b Metallurgy Division, INTEMA – CONICET, Av. J. B. Justo 4302, B7608FDQ Mar del Plata, Argentina
article info
Article history: Received 13 October 2015 Received in revised form 13 January 2016 Accepted 17 January 2016 Available online 25 January 2016
Keywords: Austempered ductile iron Physical vapor deposition Titanium nitride Coating thickness Rolling contact fatigue
abstract
The in?uence of TiN coating thickness on the rolling contact fatigue (RCF) behavior of austempered ductile iron (ADI) was investigated. Coatings were applied in an industrial PVD reactor using processing parameters speci?cally selected for ADI. Deposition times were adjusted to obtain nominal thicknesses of 0.7, 1.4 and 2.1 mm. RCF tests were performed in a ?at washer type testing rig under a lubricated contact. The maximum Hertz contact pressure was 1400 MPa. RCF data were analyzed using the two-parameter Weibull distribution. The rolling track of the tested samples was examined by using SEM. As coating thickness increases, within the analyzed range, the arithmetic average roughness of the coated samples increases slightly while the bearing area decreases more signi?cantly. The elastic modulus and residual stresses of the coatings also increase with thickness, but the coating hardness and the adhesion strength does not. Finally, the RCF resistance of the coated samples decreases as thickness increases. A coating thickness of about 0.7 mm enhances the RCF resistance of ADI substrates while thicker coatings worsen it. Failures in samples
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