Authors: Christian Haase Sandip Ghosh Chowdhury Luis A BarralesMora Dmitri A Molodov Günter Gottstein
Publish Date: 2012/11/27
Volume: 44, Issue: 2, Pages: 911-922
Abstract
In the present study microstructure and texture evolution in an austenitic Fe28 wt pct Mn028 wt pct C TWIP steel in the range between 10 and 80 pct reduction by cold rolling were systematically analyzed The formation of the observed microstructural features occurred in three different stages I 10 to 20 pct—mainly slip lines grain elongation and formation of few twinmatrix lamellae II 30 to 50 pct—severe increase of the volume fraction of twins alignment of twins with the rolling plane and formation of microshear bands and III 60 to 80 pct—further alignment of twins evolution of a herring bone structure and macroshear bands In contrast to most fcc metals the transition from Copper to Brasstype texture occurred at low strain levels 30 pct This behavior is attributed to the early formation of deformation twins in the material and can be related to the SFE of this high manganese steel At higher reduction levels microscopic ≥40 pct and macroscopic shear band formation ≥60 pct contributed to the increase of randomly oriented grains mainly at the expense of the Brass component Furthermore the formation of the Goss component and of the 〈111〉//ND fiber γ is attributed to severe twin formationThe authors gratefully acknowledge the financial support of the Deutsche Forschungsgemeinschaft DFG within the Collaborative Research Centre SFB 761 “Stahl ab initio Quantenmechanisch geführtes Design neuer Eisenbasiswerkstoffe” One of the authors SGC wishes to acknowledge the Alexander von Humboldt Foundation for the financial support during his stay at the Institute of Physical Metallurgy and Metal Physics RWTH Aachen University
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