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Prediction of Flow Curves and Micro-Structural Evolution in Strain Induced Dynamic Transformation of Low Carbon Steel

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Abstract:

The relationships between flow stress curve and microstructure evolution in strain induced dynamic phase transformation (SIDT) of low carbon steel (0.22wt.%) were quantitatively investigated. The deformation was carried out at just above Ar3 temperature (710°C) as a function of strain rate (0.01-5/sec). The softening process of SIDT was well agreed with calculated result derived from Avrami’s and constitutive equation at higher strain rate than 0.5/sec. However, the calculated results differed from the experimental curve at strain rate of less than 0.2/sec. This is due to fact that the dynamic transformation from austenite to ferrite can not be completed owing to less stored energy during hot deformation.

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Periodical:

Materials Science Forum (Volumes 510-511)

Pages:

518-521

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.510-511.518

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Online since:

March 2006

Authors:

Jae-Young An, Young Jae Kwon, S.I. Kim, Duk Lak Lee, Yeon Chul Yoo

Keywords:

Hot Deformation, Low Carbon Steel, Strain Induced Dynamic Transformation (SIDT), Strain Rate

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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