Correlating the Aluminum Content with Ferrite Grain Size and Core Loss in Non-oriented Electrical Steel

摘要

The average ferrite grain size in fully processed electrical steel with silicon content of 1.5%, increased from 25 to 61 μm with the increase in addition of aluminum content from 0.05 to 0.3%. The coarsening of ferrite grains resulted in the lowering of core loss value from 5.8 to 3.5 W/kg. Coarsening of ferrite grains in high aluminum content steel was due to the evolution of larger size A1N particles which were unable to prevent ferrite grain growth during annealing of cold rolled and decarburised coils.