Block Models and(011)[100]Recrystallized Orientation in Cold Rolled Single Crystals of αIron -A Critical Review-

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The block theory for recrystallization nucleation proposed by B. F. Decker and D. Harker (D–H) has been critically reviewed in the light of recent experimental evidence and slip system geometry. Unpublished as well as available data of pole figures of <I>e.g.</I> (011) [100]-oriented single crystals of Fe–3%Si have been used for discussion. The experimental results on which the D–H theory was based are found to be incorrect. For example, <I>Goss</I> recrystallized texture is developed in crystals rolled at reductions higher than 60%, while in case of D–H reduction was 40%.<br> Operative slip systems on rolling have been estimated using Taylor factor, and lattice rotation has been analyzed. On this basis, existing block models have been discussed and classified into "hard" and "soft" block models in view of the relation between local deformation within blocks and total deformation by rolling. The <I>Goss</I> recrystallized orientation was formed from cold rolled {111} <211> orientation by a reverse lattice rotation; <I>i.e.</I> the rotation direction is opposite to the direction caused by rolling deformation. This fact has been used to discuss the validity of the models. Preference of the hard model has been emphasized. The D–H model belongs to the soft model, but with this it is not possible to give reasonable explanations.

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  • ISIJ international  

    ISIJ international 38(6), 510-517, 1998-06-15 

    The Iron and Steel Institute of Japan

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