Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Prediction of Volume Fraction and Grain Size of Ferrite under Intercritical Rolling of Low Carbon Steels
Jun-ichi WAKITAJunji HAZIOsamu KAWANOManabu TAKAHASHIKazuaki ESAKA
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1995 Volume 81 Issue 6 Pages 649-654

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Abstract

Static recovery and recrystallization behavior of α grains of low carbon steels have been studied by means of hot working simulator. Static recovery rate increases as carbon content increases up to 0.02mass% and is nearly constant above 0.02mass%. The critical strain for recrystallization, εm, decreases with decreasing initial grain size and strain rate and with increasing deformation temperature. Recrystallized grains are developed within an interval of 50 ms after straining over εm. Recrystallized α grain sizes decrease with decreasing initial grain size and deformation temperature, and with increasing strain. Recrystallized fraction increases with decreasing initial grain size and with increasing strain and deformation temperature. 2-step hot working tests at various temperatures above and below Ae3 have been carried out to examine the strain induced transformation from hot worked austenite to ferrite.
On the basis of these results, a prediction model of α volume fraction and grain size is developed and its availability in the case of intercritical rolling was certified.

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© The Iron and Steel Institute of Japan
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