Sliding wear performance of thermally sprayed Ni-Cr based alloy deposited on SAE 1045 steel
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.396
Sliding wear performance of thermally sprayed Ni-Cr based alloy deposited on SAE 1045 steel Edwuin Carrasquero a,*, Arnoud Tricoteaux b, Jorge Fajardo c and Luis López c a
Research Group in Characterization, Processing and Protection of Materials (GICPPM), Universidad Estatal de Milagro (UNEMI), Ecuador
b
UPHF, Département de l'Ingénierie de la Chimie et des Matériaux, Valencienne, France
c
Research Group in New Materials and Processes of Transformation (GiMaT), Universidad Politécnica Salesiana, Calle Vieja 12-30 y Elia Liut, Cuenca, Ecuador
*corresponding
autor : [email protected]
ABSTRACT
The present work has been carried out in order to investigate the sliding wear performance of a Ni-Cr based alloy, containing boron, carbon, silicon and iron, deposited onto a SAE 1045 steel substrate. The coatings were thermally sprayed by means of a High Velocity Oxy-Fuel system and post heat-treated for one hour at 760ºC in an argon atmosphere. The relative sliding performance was evaluated under unlubricated dry conditions at different applied normal loads and sliding velocities, in order to analyze the influence of these parameters on the wear response. Test results are discussed and interpreted on the basis of both microstructural evaluations and mechanical properties measurements. The surface morphology and topography of the wear scars have been studied through of a Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) techniques. The results have shown an improved wear resistance of the coated steel samples as compared to the uncoated ones.
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INTRODUCTION In the past few years, the interest for Ni-Cr based alloys has grown extensively due to their potential as a possible replacement of electrolytic hard chromium (EHC) plating. EHC is a traditional coating typically employed in many different industries for a variety of applications, owing to its wear and corrosion resistance. As indicated by several authors, the adoption in the last two decades of a number of independent environmental regulations for the protection of water, air and ground, limited the emission of different pollutants including the highly toxic chromic anhydride (CrO 3) and hexavalent chromium (Cr VI) present in EHC baths or produced during the synthesis of the coating. This has given rise to significant changes in the management of production processes, particularly in the mechanical engineering industry involved with coating technology [1-3]. Ni-Cr based alloys are very attractive as feasible substitutes of EHC plating, because of their good wear, oxidation and corrosion resistance at moderate and elevated temperatures. They are widely used in many different fields including chemical, pet
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