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Growth Process of Goss Grains during Secondary Recrystallization of Grain‐oriented Electrical Steels
Author(s) -
Mao W.,
Guo W.,
Li Y.
Publication year - 2010
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.201000051
Subject(s) - materials science , recrystallization (geology) , electrical steel , annealing (glass) , metallurgy , grain growth , grain boundary , zener pinning , grain size , microstructure , pinning force , condensed matter physics , critical current , superconductivity , paleontology , physics , biology
The coarsening behaviour of Goss grains in grain oriented electrical steel during annealing after cold rolling was investigated. The results show that the coarsening resistance of fine second phase particles was reduced inside the surface grains. This induced particle coarsening and the reduction of particle density. The reduction of particle density was grain orientation dependent because of the elastic anisotropy of ferrite. Experimental results also revealed that some small surface Goss grains exhibited higher particle density than their neighbouring grains. This may account for the higher coarsening resistance of fine particles and be responsible for the stronger pinning effect on the migration of grain boundaries. Therefore, these Goss grains may have grown at the expense of smaller neighbouring grains and most were very unlikely to be consumed by large neighbouring grains during secondary recrystallization annealing. When their sizes became even larger, they consumed the large grains in turn and consequently formed a strong Goss texture.