Evaluación tribológica de un acero fundido carbo-austemperado sometido al ensayo disco-disco

Sebastián Rivera Grisales; Oscar Eduardo Ríos Díez; Claudia Patricia Serna Giraldo; Ricardo Emilio Aristizábal Sierra

doi:10.17533/udea.rcm.342068

Authors

Sebastián Rivera Grisales University of Antioquia
Oscar Eduardo Ríos Díez University of Antioquia
Claudia Patricia Serna Giraldo University of Antioquia
Ricardo Emilio Aristizábal Sierra University of Antioquia

DOI:

https://doi.org/10.17533/udea.rcm.342068

Keywords:

carbo-austempered, wear, twin disk test

Abstract

The carbo-austempered steels, with CFB (Carbide-Free Bainite) structure in the layer, are established as an interesting alternative for the substitution of conventional steels thermally treated by cementation, especially in applications that demand high stability and reliability against wear phenomena. From this, in the present work we evaluated the mechanisms of wear suffered by cast steel of chemical composition: 0.30C-1.87Si-0.55Mn-0.92Cr (wt. %), subjected to carbo-austempered heat treatment, the carburized surface was up to 0.7%C and then, it treated isothermally 250 °C and 300 °C with times of 480 and 240 minutes respectively. Were tests carried out in a twin-disc machine, in which variables such as: number of cycles, sliding percentage, lubrication, surface finish and linear speed are controlled. In order to analyze the failure mechanisms, the calculation of the wear rates (ASTMG98-17 standard) and the microstructural analysis of the wear tracks were carried out by optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results show that the worn surface layers are formed by nanometric structures, which resulted in a greater resistance to wear of these materials, in which mechanisms of abrasion and fatigue were identified mainly. Furthermore, wear rates decreased proportionally to the temperature of the isothermal treatment.

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Author Biographies

Sebastián Rivera Grisales, University of Antioquia

Materials Engineering Student, University of Antioquia, GIPIMME Group, Medellín, Colombia.

Oscar Eduardo Ríos Díez, University of Antioquia

PhD Student in Materials Engineering, University of Antioquia, GIPIMME Group, Medellín, Colombia.

Claudia Patricia Serna Giraldo, University of Antioquia

Associate Professor, Department of Metallurgical and Materials Engineering, University of Antioquia, GIPIMME Group Coordinator, Medellín, Colombia.

Ricardo Emilio Aristizábal Sierra, University of Antioquia

Associate Professor, Department of Metallurgical and Materials Engineering, University of Antioquia, GIPIMME Group, Medellín, Colombia.

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