Fatiga por flexión/rotación en un acero fundido carbo-austemperado

Oscar Eduardo Ríos Díez; Claudia Patricia Serna Giraldo; Ricardo Emilio Aristizábal Sierra; Laura Vargas

doi:10.17533/udea.rcm.342062

Authors

Oscar Eduardo Ríos Díez University of Antioquia
Claudia Patricia Serna Giraldo University of Antioquia
Ricardo Emilio Aristizábal Sierra University of Antioquia
Laura Vargas University of Antioquia

DOI:

https://doi.org/10.17533/udea.rcm.342062

Keywords:

carbo-austempering, fatigue, retained austenite, bainitic transformation

Abstract

Studies on the use of bainitic microstructures for surface strengthening of steels have been recorded since 2002 [1–3]. Due to the promising properties obtained, combination of high ultimate tensile strength (1.7-2.2 GPa), good ductility (5-30%) and exceptionally high tenacity (45 MPam1/2) [4–7], a wide range of applications is visualized, in operations involving the application of cyclic loads, such as shafts, gears and bearings, among others. From this, the current work aims to study the fatigue behavior of a low carbon cast steel (0.3C-1.9Si-0.5Mn-0.9Cr wt. %), subjected to a carbo-austempered heat treatment. Fatigue tests were carried out under rotating bending conditions on carburized samples up to 0.7 %C on the case and isothermally treated at 250 °C and 300 °C, after which fracture surfaces and microstructural characteristics were examined by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that microstructural parameters such as the volume fraction of the bainitic ferrite, the thickness of the bainitic ferrite plate, the carbon content of the retained austenite and the amount of blocky austenite are important factors controlling the fatigue resistance in this type of materials.

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Author Biographies

Oscar Eduardo Ríos Díez, University of Antioquia

Doctoral student in Materials Engineering, Universidad de 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.

Laura Vargas, University of Antioquia

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

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