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Determination of Initiation of Dynamic Recrystallization in AISI 4340 Steel

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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 °C and 1150 °C 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.

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Periodical:

Advanced Materials Research (Volume 893)

Pages:

381-386

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.893.381

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Online since:

February 2014

Authors:

Apichat Sanrutsadakorn*, Viton Uthaisangsuk, Surasak Suranuntchai

Keywords:

AISI 4340, Critical Strain, Critical Stress, Dynamic Recrystallization (DRX), Hot Deformation

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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