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Criteria for prediction of flow instabilities and microstructural manifestations during warm working of AISI 304L stainless steel

Venugopal, S and Mannan, SL and Prasad, YVRK (1993) Criteria for prediction of flow instabilities and microstructural manifestations during warm working of AISI 304L stainless steel. In: Materials Science and Technology, 9 (11). pp. 1021-1030.

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Official URL: http://www.ingentaconnect.com/content/maney/mst/19...

Abstract

The deformation characteristics of 304L stainless steel in compression in the temperature range 20–700°C and strain rate range 0·001–100 s−1 have been studied with the aim of characterising the .flow instabilities occurring in the microstructure. At higher temperatures and strain rates the stainless steel exhibits flow localisation, whereas at temperatures below 500°C and strain rates lower than 0·1 s−1 the flow instabilities are due to dynamic strain aging. Strain induced martensite formation is responsible for the flow instabilities at room temperature and low strain rates (0·01 s−1). In view of the occurrence of these instabilities, cold working is preferable to warm working to achieve dimensional tolerance and reproducible properties in the product. Among the different criteria tested to explain the occurrence of instabilities, 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 the above instability features.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Institute of Materials, Minerals and Mining.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 03 Feb 2011 08:14
Last Modified: 03 Feb 2011 08:14
URI: http://eprints.iisc.ernet.in/id/eprint/35384

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