Instability map for cold and warm working of as-cast 304 stainless steel

Venugopal, S and Mannan, SL and Prasad, YVRK (1997) Instability map for cold and warm working of as-cast 304 stainless steel. In: Journal of Materials Processing Technology, 65 (1-3). pp. 107-115.

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Abstract

The deformation characteristics of as-cast 304 stainless steel under compression in the temperature range 20-600 degrees C and strain rate range 0.001-100 s(-1) have been studied with a view to characterizing the flow instabilities occurring in the microstructure. Ar strain rates of less than 0.05 s(-1), as-cast 304 stainless steel exhibits flow localization in the temperature range 20-600 degrees C, whereas dynamic strain ageing occurs at intermediate temperatures and below 5 s(-1). At room temperatures and strain rates of less than 0.05 s(-1), martensite formation is observed. To avoid the above microstructural instabilities warm working should be carried out at strain rates greater than 10 s(-1) in the temperature range 400-600 degrees C and cold working could be done in the range of about 0.05-0.8 s(-1). The continuum criterion developed on the basis of the principles of maximum rate of entropy production and separability of the dissipation function, predicts accurately all of the above instability features. (C) 1997 Elsevier Science S.A.

Item Type:	Journal Article
Publication:	Journal of Materials Processing Technology
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Stainless steel;Temperature;Instability features
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	18 Oct 2011 05:03
Last Modified:	18 Oct 2011 05:03
URI:	http://eprints.iisc.ac.in/id/eprint/38271

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