Grain boundary segregation and grain growth inhibition in silicon iron: The effect of boron and nitrogen
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r a t h e r was r e l a t e d to the amount of f r e e n i t r o g e n in pct s i l i c o n t r a n s f o r m e r s t e e l is p r o c e s s e d to s o l u t i o n . The a d d i t i o n of s m a l l a m o u n t s of b o r o n to d e v e l o p a v e r y s t r o n g (110)[001] s h e e t t e x t u r e which the a l l o y w e r e found to be e s s e n t i a l f o r the d e v e l o p o p t i m i z e s the m a g n e t i c p e r m e a b i l i t y of the m a t e r i a l ment of the h i g h e s t p e r m e a b i l i t y s t e e l , h o w e v e r . along" the r o l l i n g d i r e c t i o n of the s h e e t . T h i s t e x t u r e Fiedler12,13 d e m o n s t r a t e d that m a x i m u m g r a i n growth is p r o d u c e d by s e c o n d a r y r e c r y s t a l l i z a t i o n whose inhibition is a t t a i n e d with the a d d i t i o n of a l l t h r e e of d r i v i n g f o r c e is the s u r f a c e t e n s i o n i m b a l a n c e b e t w e e n a l a r g e g r a i n and s m a l l e r s u r r o u n d i n g m a t r i x g r a i n s . 1-~ the e l e m e n t s boron, n i t r o g e n , and s u l f u r to o t h e r w i s e high p u r i t y s i l i c o n i r o n a l l o y s . In his e x p e r i m e n t s , F o r s e c o n d a r y r e c r y s t a l l i z a t i o n to o c c u r , s o m e g r a i n s s e c o n d a r y r e c r y s t a l l i z a t i o n o c c u r r e d only in the a l l o y s m u s t grow to a s i z e much l a r g e r than the p r i m a r y r e with o p t i m u m a d d i t i o n s of t h e s e e l e m e n t s . E l i m i n a t i o n c r y s t a l l i z e d g r a i n m a t r i x while n o r m a l g r a i n growth of of any one of t h e s e e l e m e n t s was shown to l e a d to the m a t r i x g r a i n is s u p p r e s s e d . In an e f f o r t to u l t i c o a r s e n i n g of the p r i m a r y g r a i n s t r u c t u r e and the s u p m a t e l y d e v e l o p an u n d e r s t a n d i n g of the p r o c e s s of p r e s s i o n of s e c o n d a r y r e c r y s t a l l i z a t i o n . s e c o n d a r y r e c r y s t a l l i z a t i o n in s i l i c o n s t e e l , one a s p e c t The r e s u l t s of G r e n o b l e and F i e d i e r both s u g g e s t that of this p r o b l e m , n a m e l y the inhibition of n o r m a l g r a i n inhibition of n o r m a l g r a i n growth by a s o l u t e r e l a t e d g r o w t h in b o r o n - s i l i c o n s t e e l , 6-8 will be a d d r e s s e d . m e c h a n i s m m u s t be c o n s i d e r e d . Solute inhibition of In c o n v e n t i o n a l i r o n - 3 pct s i l i c o n a l l o y s , n o r m a l g r a i n g r o w t h has been d e m o n s t r a t e d in many s y s t e m s g r a i n growth is inhibited by a d i s t r i b u t i o n of s e c o n d w h e r e s e c o n d p h a s e p a r t i c l e s do not d e v e l o p , and it is p h a s e p r e c i p i t a t e p a r t i c l e s , p r i n c i p a l l y MnS. z,9 H i g h e r thought that s e g r e g a t i o n of a s o l u t e a t m o s p h e r e e i t h e r p e r m e a b i l i t y s i l i c o n i r o n p r o d u c t s have
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