Abstract

BOLIVAR OSORIO, Francisco Javier; BEJARANO GAITAN, Gilberto  and  GOMEZ BOTERO, Maryory Astrid. INFLUENCE OF THE DUPLEX COATINGS ON THE MECHANICAL PROPERTIES AND WEAR RESISTANCE OF THE TEMPERED AISI 4140 STEL. Rev.EIA.Esc.Ing.Antioq [online]. 2013, n.19, pp.151-160. ISSN 1794-1237.

The AISI 4140 steel is a low chrome/molybdenum alloyed steel with high tensile strength and good toughness, which is normally used for the manufacture of machine parts such as gears, crank shafts, camshafts, etc. However, its wear resistance is quite limited and this is usually improved by nitriding surface treatment. The purpose of this study was to increase the mechanical properties and wear resistance of 4140 steel by applying a DUPLEX surface treatment consisting of a liquid nitriding (known as Teniffer) followed by the deposition of a titanium nitride (TiN) hard coating. The crystalline microstructure was evaluated by Xray diffraction (XRD), morphology and elemental chemical composition was determined by microscopy SEM and energy dispersive X-ray spectroscopy (EDS), tribological properties were tested using a tribometer type ballondisc and micro hardness was determined by the Vickers method. The duplex treated samples showed a wear resistance 4 times greater than the tempered sample, demonstrating the potential application of 4140 steel that has undergone this duplex treatment.

Keywords : Duplex coatings; titanium nitride; nitriding; wear resistance; magnetron sputtering.

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