Comportamiento Tribológico y Microestructural en Recubrimientos Aplicados por GTAW y HVOF (Proceso Térmico de Espreado) y Usado en Recuperación de Aceros Grado Herramienta AISI/SAE D2

AUTOR(ES)
FONTE

Soldag. insp.

DATA DE PUBLICAÇÃO

2016-06

RESUMO

Abstract The Fe-Cr-Mo alloys are use in covers to protect the components that are under wear and corrosion. The high velocity thermo spray covering by HVOF (high velocity oxi-fuel) in Fe-Cr-Mo alloys has reported as a good result in projection fields for the steel tool grade for cold work. The HOVF is an attractive method to apply covering and recuperate diameters. New surfaces could be provided without the distortion material caused by the weld. For those materials that are easy to crack and modified its composition due hard phases formation and high carbon content, because of the process conditions which combine a relative low flame temperature with a low exposition time. The microstructure and the covering physic properties are determined by the physical and chemical properties of the impregnated particles in the substrate that depends as well of a big amount of parameters as the pistol design, oxygen/fuel relation, injection method, particle size and shape, among others This research studies the influence of the processing parameters on the mechanical and microstructural properties of a Diamalloy 1008 (Fe-Cr-Mo alloy) coating applied with high velocity oxy-fuel (HVOF) and five different electrodes types were applied by Gas tungsten Arc Welding (GTAW) on cold work tool steel mold specimens. These coatings are commonly used as a protection against corrosion and wear, but they also have the capacity to recover damaged areas as toolbox for automotive stamping. The specimens were characterized by optical and scanning electron microscopy to evaluate the quality of the coatings; Vickers microhardness and Pin-Ball-Disc were used to quantify the mechanical and wear performance of the coatings.

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