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Open AccessFeature PaperArticle

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

1
Gipimme, Department of Materials Engineering, Engineering Faculty, Universidad de Antioquia, Calle 67 No. 53-108, Bloque 18, Oficina 240, Medellín 050010, Colombia
2
MATERALIA Research Group, Department of Physical Metallurgy, National Center for Metallurgical Research (CENIM-CSIC), Avenida Gregorio del Amo, 8, 28040 Madrid, Spain
*
Authors to whom correspondence should be addressed.
Metals 2020, 10(5), 635; https://doi.org/10.3390/met10050635
Received: 13 April 2020 / Revised: 10 May 2020 / Accepted: 12 May 2020 / Published: 14 May 2020
(This article belongs to the Special Issue 10th Anniversary of Metals: Metallurgy and Metal Technology)
Carburizing 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. View Full-Text
Keywords: carbo-austempering; intercritical austenitization; isothermal transformation; multiphasic structures; bainitic transformation carbo-austempering; intercritical austenitization; isothermal transformation; multiphasic structures; bainitic transformation
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Ríos-Diez, O.; Aristizábal-Sierra, R.; Serna-Giraldo, C.; Jimenez, J.A.; Garcia-Mateo, C. Development of Nanobainitic Microstructures in Carbo-Austempered Cast Steels: Heat Treatment, Microstructure and Properties. Metals 2020, 10, 635.

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