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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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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
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)
Depositing User: Anka Setty
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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