Estudio de la evolución microestructural del acero AISI A2 sometido a tratamientos isotérmicos de austemperado y Q&P

Jheison Andrés Tobón Aguirre; Claudia Patricia Serna Giraldo; Oscar Eduardo Ríos Diez

doi:10.17533/udea.rcm.342066

Authors

Jheison Andrés Tobón Aguirre University of Antioquia
Claudia Patricia Serna Giraldo University of Antioquia
Oscar Eduardo Ríos Diez Universidad de Antioquia

DOI:

https://doi.org/10.17533/udea.rcm.342066

Keywords:

tool steels, bainite, austempering, quenching & partitioning

Abstract

AISI A2 steel is widely used in cold deformation applications, due to its alloy content that after tempering gives a carbide-rich microstructure which give it high wear resistance. The ideal scenario for these steels, meanly in applications where cold deformation is generated by impact, is to maintain wear resistance and at the same time improve its tenacity. Applying low temperature isothermal treatments such as Austempering and Quenching & Partitioning (Q&P) it is possible to obtain tougher microstructures with the same wear resistance. In order to determine the microstructural response of AISI A2 steel to these isothermal treatments, an austenitizing temperature of 950 ºC was defined. This is the ideal temperature to conserve austenitic grain size and primary carbides size. Subsequently austempering treatments were performed at 300 ºC for 1, 2 and 3 hours. Q&P treatments were performed cooling the austenized sample until 170 ºC and 150 ºC holding at this temperature for 5 minutes and then heating until 300 ºC for 1, 2 and 3 hours. Microstructural characterization was done by optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). Hardness testing were done. Results were compared with quenched and tempered steel.

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Author Biographies

Jheison Andrés Tobón Aguirre, University of Antioquia

Pyrometallurgical and Materials Research Group (GIPIMME), Materials Engineering, Faculty of Engineering, University of Antioquia, Medellín, Colombia

Claudia Patricia Serna Giraldo, University of Antioquia

Coordinator of the Pyrometallurgical and Materials Research Group (GIPIMME), Materials Engineering, Faculty of Engineering, University of Antioquia, Medellín, Colombia.

Oscar Eduardo Ríos Diez, Universidad de Antioquia

PhD student, Pyrometallurgical and Materials Research Group (GIPIMME), Materials Engineering, Faculty of Engineering, University of Antioquia, Medellín, Colombia.

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