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The role of niobium as microalloying element in electrical sheet
Author(s) -
Hulka Klaus,
Vlad Constantin,
Doniga Ana
Publication year - 2002
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.200200014
Subject(s) - electrical steel , metallurgy , niobium , volume fraction , materials science , annealing (glass) , grain size , texture (cosmology) , grain growth , recrystallization (geology) , hot rolled , composite material , paleontology , image (mathematics) , artificial intelligence , computer science , biology
The processing route of grain oriented electrical sheet was simulated by laboratory trials. Besides MnS, the effect of AIN and NbC as an inhibitor phase in 3 % silicon steel was also investigated. In the hot strip material the niobium microalloyed steel showed the highest volume fraction of the {110}<001> Goss texture at 0.3 to 0.4 mm below the surface. This superiority was maintained after cold rolling and annealing after both, one step or two step cold reduction schedules. A volume fraction of the Goss texture of more than 80 % is typical for this steel concept. It can be explained by the solubility product of NbC, which guarantees grain size control during the primary recrystallisation processes and allows the Goss texture component to grow during secondary recrystallisation, which usually follows a steel decarburisation. Consistent with the highest volume fraction of Goss texture, the core losses are lowest in the sheet using NbC as an inhibitor phase.