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Determination of the Critical Strains for the Initiation of Dynamic Transformation and Dynamic Recrystallization in Four Steels of Increasing Carbon Contents
Author(s) -
Ghosh Chiradeep,
Basabe Vladimir V.,
Jonas John J.
Publication year - 2013
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201200188
Subject(s) - dynamic recrystallization , materials science , recrystallization (geology) , torsion (gastropod) , metallurgy , carbon steel , atmospheric temperature range , thermodynamics , microstructure , hot working , geology , medicine , paleontology , corrosion , surgery , physics
Hot torsion tests are carried on three plain carbon steels and a Nb microalloyed steel of increasing C concentrations. The tests are performed at strain rates up to 4 s −1 and over the temperature range 743–917°C. The onsets of dynamic transformation (DT) and dynamic recrystallization (DRX) are detected using the double‐differentiation method. Both mechanisms are initiated under all testing conditions but one. The critical strain for DT increases with temperature while the reverse dependency is exhibited by the critical strain for DRX.