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Study of fractional softening in multi-stage hot deformation

Yarlagadda, Prasad K., Rao, K.P., & Hawbolt, E. Bruce (1998) Study of fractional softening in multi-stage hot deformation. Journal of Materials Processing Technology, 77(1-3), pp. 166-174.

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Abstract

In this paper, the softening behaviour of a medium-carbon steel under hot working conditions in multi-stage compression is presented. Continuous and interrupted compression tests were performed in the temperature range 800–1100 degrees Celsius at strain rates of 0.1, 1 and 8 s1. The interrupted deformations were conducted with delay times varying between 1 to 20 s after achieving a strain of approximately 0.2 to 0.4 in the first stage. The fractional softening has been predicted by three different methods, namely the offset-stress method, the back-extrapolation stress method and a currently proposed strain-recovery method. It has been found that the back-extrapolation stress method normally predicts higher reloading stress and hence a lower fractional softening than that of the offset-stress method. The strain-recovery method yields consistent results in the estimation of fractional softening that can be used in predicting the deformation mechanism.

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17 citations in Web of Science®
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ID Code: 6448
Item Type: Journal Article
Additional Information: For more information please refer to the publisher's website (link above) or contact the author: y.prasad@qut.edu.au
Keywords: Deformation mechanism, Medium, carbon steel, Multi, stage compression
DOI: 10.1016/S0924-0136(97)00414-7
ISSN: 0924-0136
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300) > Mechanical Engineering not elsewhere classified (091399)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 1998 Elsevier
Deposited On: 09 Mar 2007
Last Modified: 15 Jan 2009 17:22

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