The onset temperature of secondary recrystallization and the sharpness of Goss secondary recrystallization texture in the nitrided Fe–3%Si alloy

Abstract

Primary recrystallized Fe–3%Si specimens were nitrided and annealed intermittently with a heating rate of 15°C/h in 100% N 2 atmosphere. The magnetic induction B 8 was measured after each annealing. The onset of secondary recrystallization was detected by the rapid rise of B 8. The maximum B 8 obtained was about 1.94 T when the onset temperature of the secondary recrystallization ( T cr) was around 1075°C. The same primary specimens were coated with MgO and annealed with the same heating rate in 5% H 2–N 2. The initial grain size and nitrogen content for the maximum B 8 were quite different in this annealing. The difference in the optimum grain size and nitrogen content for obtaining the highest B 8 in both annealing methods was explained by assuming that T cr determines the B 8 in both annealing methods.