Abstract
AbstractUltrafine grained (UFG) steels with bimodal grained microstructure consisting of ultrafine grains in the size of 400 nm and micrometer‐sized grains were obtained by repetitive thermo‐mechanical processing. The microstructure evolution and mechanical properties were studied. It was revealed that the formation of the bimodal grained microstructure is attributed to the combination of continuous and discontinuous recrystallization. Compared with the uniform UFG steel with average grain size of about 400 nm, the ductility was remarkably improved by introducing micrometer‐sized grains into the UFG microstructure, providing better strength‐ductility balance.
Published Version
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