Constitutive model for vanadium microalloyed steel under hot working conditions

Phaniraj, MP and Lahiri, AK (2004) Constitutive model for vanadium microalloyed steel under hot working conditions. In: Materials Science and Technology, 20 (9). pp. 1151-1157.

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Abstract

Hot compression tests were carried out in the temperature range $850-1150^oC$ at $0.1-60 s^-1$ strain rates. The hyperbolic sine equation and neural networks were used to model the constitutive behaviour. Evaluating constitutive parameters n, Q and A using the usual log – log plots does not yield constant values. The n, Q and A values were determined simultaneously using a non-linear optimisation procedure and were fitted as functions of strain. These relations, in conjunction with the hyperbolic sine equation, describe the constitutive behaviour of the steel. A 3 : 4 : 1 neural network is trained using 75% of the stress – strain data. The network predicts flow stresses and peak strains with good accuracy. Vanadium increases the peak strain, peak stress, and mean flow stress of austenite significantly.

Item Type:	Journal Article
Publication:	Materials Science and Technology
Publisher:	Maney Publishing
Additional Information:	The copyright of this article belongs to Maney Publishing.
Keywords:	Steels;Mechanical properties;Modelling;Neural networks;Vanadium microaddition References
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	09 Apr 2006
Last Modified:	19 Sep 2010 04:25
URI:	http://eprints.iisc.ac.in/id/eprint/6188

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