Determination of initiation of dynamic recrystallization in AISI 4340 steel
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Publication Details
Author list: Sanrutsadakorn A., Uthaisangsuk V., Suranuntchai S.
Publisher: Trans Tech Publications
Publication year: 2014
Volume number: 893
Start page: 381
End page: 386
Number of pages: 6
ISBN: 9783038350255
ISSN: 1022-6680
eISSN: 1662-8985
Languages: English-Great Britain (EN-GB)
Abstract
In this work, two approaches for determining critical stress and strain for initiation of dynamic recrystallization (DRX) of the AISI 4340 steel were presented.The first one applied a polynomial function to represent relationship between work hardening rate and flow stress. Secondly, Cingara constitutive model were employed. To investigate hot deformation behavior of the steel, compression tests were performed at different temperatures between 850 ฐC and 1150 ฐC and strain rates between 0.01s-1and 10 s-1. Obviously, both methods provided different values of critical stress and critical strain.Accuracy of the first method depended on fluctuations of the fitted strain hardening curve. On the other hand, results of the Cingara model was primarily related to the described flow curves up to their peak points. It could be noticed that the DRX occured during hot deformation of the examined steel started when the normalized critical stress and strain reached the values of 0.735 and 0.324, respectively. ฉ (2014) Trans Tech Publications, Switzerland.
Keywords
Critical stress and strain
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