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Experimental Determination of Continuous Cooling Transformation Diagrams of Hot-Rolled Heat Treatable Steel Plates Using Quenching Dilatometry

Published online by Cambridge University Press:  02 March 2016

Gerardo Altamirano-Guerrero ,
Emmanuel J. Gutiérrez-Castañeda ,
Omar García-Rincón  and
Armando Salinas-Rodríguez
Gerardo Altamirano-Guerrero
Affiliation:
Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional Unidad Saltillo, Industria Metalúrgica 1062, Parque Industrial Saltillo-Ramos Arizpe, C.P. 25900, Ramos Arizpe, Coahuila, México.
Emmanuel J. Gutiérrez-Castañeda
Affiliation:
Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional Unidad Saltillo, Industria Metalúrgica 1062, Parque Industrial Saltillo-Ramos Arizpe, C.P. 25900, Ramos Arizpe, Coahuila, México.
Omar García-Rincón
Affiliation:
Ternium México, S.A. de C.V. Avenida Universidad 992, Cuauhtémoc, 66450, San Nicolás de los Garza, N.L. México.
Armando Salinas-Rodríguez
Affiliation:
Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional Unidad Saltillo, Industria Metalúrgica 1062, Parque Industrial Saltillo-Ramos Arizpe, C.P. 25900, Ramos Arizpe, Coahuila, México.
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Abstract

This article outlines the use of quenching dilatometry in phase transformation kinetics research in steels under continuous cooling conditions. For this purpose, the phase transformation behavior of a hot-rolled heat treatable steel was investigated over the cooling rate range of 0.1 to 200 °C/s. The start and finish points of the austenite transformation were identified from the dilatometric curves and then the continuous cooling transformation (CCT) diagrams were constructed. The experimental CCT diagrams were verified by microstructural characterization using scanning electron microscopy (SEM) and Vickers micro-hardness. In general, results revealed that the quenching dilatometry technique is a powerful tool for the characterization and study of solid-solid phase transformations in steels. For cooling rates between 200 and 25 °C/s the final microstructure consists on plate-like martensite with the highest hardness values. By contrast, a mixture of phases of ferrite, bainite and pearlite predominated for slower cooling rates (10-0.1 °C/s).

Keywords

Phase transformationKineticsDiffusion
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1812: Symposium 6B – Advanced Structural Materials—2015 , 2016 , pp. 129 - 134
Copyright
Copyright © Materials Research Society 2016 

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