A GENERAL-THEORY OF SECONDARY RECRYSTALLIZATION IN GRAIN-ORIENTED FE-SI - METALLURGICAL PARAMETERS CONTROLLING THE MICROSTRUCTURAL EVOLUTION

The secondary recrystallization (SR) process and the related effects o n the magnetic properties of silicon-iron are discussed in the framewo rk of the general statistical theory of grain growth including texture and Zener drag influence. It has been shown that SR in silicon-iron i s related to a selective growth process experienced by Goss grains due to specific grain boundary conditions generated by the surrounding gr ains (texture). In this paper some examples showing the specific role of various microstructural parameters influencing the selectivity of S R (such as Zener drag intensity and its drop rate, initial grain size, etc.), are discussed and related to the magnetic properties, which ar e mainly controlled by the final average grain size and orientation.