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Ultrafine Grained Steels with Improved Ductility Fabricated by Repetitive Thermo‐Mechanical Processing
Author(s) -
Lan Huifang,
Du Linxiu,
Wang Xiaonan,
Liu Xianghua
Publication year - 2012
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201100169
Subject(s) - microstructure , materials science , ductility (earth science) , recrystallization (geology) , grain size , metallurgy , friction stir processing , micrometer , thermomechanical processing , composite material , mechanical engineering , paleontology , creep , engineering , biology
Ultrafine 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.