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Dynamic recrystallization of austenite in Ni-30 Pct Fe model alloy : microstructure and texture evolution
journal contributionposted on 2009-05-01, 00:00 authored by Hossein BeladiHossein Beladi, Pavel CizekPavel Cizek, Peter HodgsonPeter Hodgson
The microstructure and crystallographic texture development in an austenitic Ni-30 pct Fe model alloy was investigated within the dynamic recrystallization (DRX) regime using hot torsion testing. The prominent DRX nucleation mechanism was strain-induced grain boundary migration accompanied by the formation of large-angle sub-boundaries and annealing twins. The increase in DRX volume fraction occurred through the formation of multiple twinning chains. With increasing strain, the pre-existing Σ3 twin boundaries became gradually converted to general boundaries capable of acting as potent DRX nucleation sites. The texture characteristics of deformed grains resulted from the preferred consumption of high Taylor factor components by new recrystallized grains. Similarly, the texture of DRX grains was dominated by low Taylor factor components as a result of their lower consumption rate during the DRX process. The substructure of deformed grains was characterized by “organized,” banded subgrain arrangements, while that of the DRX grains displayed “random,” more equiaxed subgrain/cell configurations.
JournalMetallurgical and materials transactions A : physical metallurgy and materials science
Pagination1175 - 1189
PublisherSpringer New York LLC
LocationNew York, N.Y.
Publication classificationC1 Refereed article in a scholarly journal; C Journal article
Copyright notice2009, Springer
Science & TechnologyTechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringMaterials ScienceTRANSMISSION ELECTRON-MICROSCOPYHIGH-TEMPERATURE DEFORMATIONINTERSTITIAL-FREE STEELHOT DEFORMATIONSTAINLESS-STEELDISLOCATION ACCOMMODATIONULTRAFINE FERRITEGRAIN-BOUNDARIESANNEALING TWINSNUCLEATIONMechanical Engineering