Abstract
The caliber configuration design for creating ultrafine-grained steel bars through groove rolling is studied from the viewpoint of a large strain accumulation and cross-sectional shape variation in a bar. A three-dimensional explicit finite element analysis is employed for this purpose. The square-foval (flat-like-oval)-square rolling method is proposed to introduce a large strain in material. The relation between the foval configuration, a strain and cross-sectional shape is examined in the groove rolling. The influence of the equivalent strain distribution by 1st pass (foval rolling) is considered to clarify the strain distribution and a cross-sectional shape by 2nd pass, and then the foval configuration to accumulate a large strain efficiently is shown. The pass schedule to fabricate an ultrafine-grained steel of 13 mm square bar from a 24 mm square bar is proposed in warm groove rolling.
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