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Licensed Unlicensed Requires Authentication Published by De Gruyter May 18, 2013

Modeling of the hot deformation behavior of boron microalloyed steels under uniaxial hot-compression conditions

  • Ignacio Mejia , Edgar López-Chipres , Cuauhtemoc Maldonado , Arnoldo Bedolla-Jacuinde and José Maria Cabrera

Abstract

The present study shows that the hot deformation behavior of boron microalloyed steels can be quantitatively described by constitutive equations. These equations take into account both dynamic recovery and recrystallization phenomena. They have been fitted using experimental data taken from hot compression tests of four boron microalloyed steels in order to determine their characteristic parameters. The tests were carried out over a wide range of temperatures (950, 1000, 1050 and 1100°C) and strain rates (10−3, 10−2 and 10−1 s−1). The analysis of the characteristic parameters of the constitutive equations describing the hot flow behavior of these steels shows that boron additions play a major role in softening mechanisms rather than on hardening. A quantification of the boron effect is also presented. The experimental data were compared with the predictions of the proposed model and an excellent agreement between measured and predicted values for all boron micro-alloyed steels over a wide range of temperatures and strain rates was obtained.


Correspondence address, Professor Dr. Ignacio Mejía, Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo, Edificio “U”, Ciudad Universitaria, 58066-Morelia, Michoacán, México, Tel.: +52443 3223500 Ext: 4020, Fax: +52443 3223500 Ext: 4010. E-mail:

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Received: 2007-11-27
Accepted: 2008-9-18
Published Online: 2013-05-18
Published in Print: 2008-12-01

© 2008, Carl Hanser Verlag, München

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