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Effect of boron on the continuous cooling transformation kinetics in a low carbon advanced ultra-high strength steel (A-UHSS)

Published online by Cambridge University Press:  01 March 2013

G. Altamirano ,
I. Mejía ,
A. Hernández-Expósito  and
J. M. Cabrera
G. Altamirano
Affiliation:
Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo. Edificio “U”, Ciudad Universitaria, Morelia, Michoacán, México.
I. Mejía
Affiliation:
Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo. Edificio “U”, Ciudad Universitaria, Morelia, Michoacán, México.
A. Hernández-Expósito
Affiliation:
Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, ETSEIB – Universitat Politècnica de Catalunya. Av. Diagonal 647, Barcelona, Spain. Fundació CTM Centre Tecnològic, Av. de las Bases de Manresa, 1, Manresa, Spain.
J. M. Cabrera
Affiliation:
Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, ETSEIB – Universitat Politècnica de Catalunya. Av. Diagonal 647, Barcelona, Spain. Fundació CTM Centre Tecnològic, Av. de las Bases de Manresa, 1, Manresa, Spain.
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Abstract

The aim of the present research work is to investigate the influence of B addition on the phase transformation kinetics under continuous cooling conditions. In order to perform this study, the behavior of two low carbon advanced ultra-high strength steels (A-UHSS) is analyzed during dilatometry tests over the cooling rate range of 0.1-200°C/s. The start and finish points of the austenite transformation are identified from the dilatation curves and then the continuous cooling transformation (CCT) diagrams are constructed. These diagrams are verified by microstructural characterization and Vickers micro-hardness. In general, results revealed that for slower cooling rates (0.1-0.5 °C/s) the present phases are mainly ferritic-pearlitic (F+P) structures. By contrast, a mixture of bainitic-martensitic structures predominates at higher cooling rates (50-200°C/s). On the other hand, CCT diagrams show that B addition delays the decomposition kinetics of austenite to ferrite, thereby promoting the formation of bainitic-martensitic structures. In the case of B microalloyed steel, the CCT curve is displaced to the right, increasing the hardenability. These results are associated with the ability of B atoms to segregate towards austenitic grain boundaries, which reduce the preferential sites for nucleation and development of F+P structures.

Keywords

SteelstrengthB
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1485: Symposium 7D – Advanced Structural Materials—2012 , 2012 , pp. 83 - 88
Copyright
Copyright © Materials Research Society 2013 

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References

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