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Development of Nanobainitic Microstructures in Carbo-Austempered Cast Steels: Heat Treatment, Microstructure and Properties

AuthorsRíos-Diez, Oscar; Aristizábal-Sierra, Ricardo; Serna-Giraldo, Claudia; Jiménez, José Antonio; García Mateo, Carlos
Intercritical austenitization
Isothermal transformation
Multiphasic structures
Bainitic transformation
Issue Date14-May-2020
PublisherMultidisciplinary Digital Publishing Institute
CitationMetals 10(5): 635 (2020)
AbstractCarburizing implies the existence of a carbon gradient from the surface to the core of the steel, which in turn will affect both the critical temperature for austenite formation and the kinetics of the bainitic transformation during the austempering treatment. Therefore, for future development of carbo-austempered steels with nanobainitic microstructures in the case, it is key to understand the effect of such carbon gradient has on the final microstructure and the mechanical properties reached by the heat treatments used. This work was divided into two parts, firstly two alloys with similar carbon content to those at the surface and center of the carburized steel were used to establish the optimal heat treatment parameters and to study bainite transformation kinetics by high resolution dilatometry. In a second step, a carburized alloy is produced and subjected to the designed heat treatments, in order to evaluate the microstructure and mechanical properties developed. Results thus obtained are compared with those obtained in the same carburized alloy after following the most common quench and temper treatment.
Description© 2020 by the authors.
Publisher version (URL)https://doi.org/10.3390/met10050635
Appears in Collections:(CENIM) Artículos
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