Title :
Forsterite film formation and grain growth in 3% Si steel
Author :
Cunha, Marco A. ; Cesar, G.M.M.
Author_Institution :
Cia Acos Especiais Itabira, Timoteo, Brazil
fDate :
11/1/1994 12:00:00 AM
Abstract :
The forsterite film in 3% Si steel is formed by a solid state reaction of the annealing separator, MgO, with SiO2 that results from the reduction of the fayalite layer in the hydrogen atmosphere in the high temperature anneal. In this work, secondary recrystallization was about complete at 1000°C. After that temperature tertiary recrystallization can occur if the boundary drag of the second phase particles can be overcome. Addition of phosphates to the annealing separator affects the morphology of the forsterite film and can have an important effect on tertiary recrystallization by affecting the rate of decrease of the boundary-drag and/or the surface energy relationship
Keywords :
annealing; ferromagnetic materials; grain growth; iron alloys; magnesium compounds; recrystallisation; silicon alloys; surface energy; 1000 degC; Fe-Si; Fe-Si steel; H2 atmosphere; Mg2SiO4; MgO; SiO2; annealing separator; boundary drag; fayalite layer; forsterite film formation; grain growth; high temperature anneal; morphology; phosphates; second phase particles; secondary recrystallization; solid state reaction; surface energy; tertiary recrystallization; Annealing; Atmosphere; Optical films; Optical microscopy; Particle separators; Scanning electron microscopy; Semiconductor films; Steel; Strips; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
