Development of (110) [001] texture in low-alloy iron by primary recrystallization and normal grain growth
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(110) [001] t e x t u r e c a n be o b t a i n e d i n a v a r i e t y of l o w a l l o y i r o n b a s e c o m p o s i t i o n s by p r i m a r y r e c r y s t a l l i z a lion and normuI g r a i n growth. This communication d e a l s w i t h one s u c h a l l o y . T h e i n g o t c o m p o s i t i o n of t h e a l l o y t o be d i s c u s s e d is shown in T a b l e I . A i r i n d u c t i o n m e l t e d i n g o t s
W h e n such a n u c l e a t i o n g e o m e t r y is p o s s i b l e it is highly p r e f e r r e d b e c a u s e it m u c h r e d u c e s t h e f r e e e n e r g y of a c t i v a t i o n f o r n u c l e a t i o n .7 I n o r d e r t o c o n duct our critical e x p e r i m e n t , h o w e v e r , a l l o t r i o m o r p h s with predominantly d i s o r d e r e d b o u n d a r i e s a r e r e q u i r e d . Such a n i n t e r f a c i a l s t r u c t u r e is c o n s i d e r a b l y m o r e likely when t h e a l l o t r i o m o r p h s have a much h i g h e r a s p e c t r a t i o and are of more r o u n d e d a p p e a r a n c e t h a n t h o s e in D i s c u s s i o n Fig. 4 . T h e a l l o t r i o m o r p h s i n o u r F i g s . 1 a n d 2 a n d i n t h e disc u s s e r s ' Fig. 3 meet t h e s e requirements appreciably b e t t e r . T h e c o n t r i b u t i o n o f H . I . A a r o n s o n w a s s u p p o r t e d by the Army R e s e a r c h Office through G r a n t N o . D A - A R O D-31-124-73-G144.
T a b l e I. A l l o y C o m p o s i t i o n (Wt Pet)
Pct Si
Pct Cr
Pct Mn
Pct S
Pct C
Pct O
Pct N
0.51
0.03
0.15
0.0032
0.020
0.0016
0.0051
RD I
1. C. Laird andH. I. Aaronson: Acta Met., 1967, vol. 15, p. 7 3 . 2 . K. R. Kinsman, H. 1. Aatonson, andC. Laird: lbid, 1967, vol. 15, p . 1244. 3 . H. Mcl. Clark andC. M. Wayman: Met. Trans., 1972, vol. 3, p. 1979. 4. H. B. Aaron andH. l. Aaronson: ActaMet., 1968, vol. 15, p. 789. 5. A. D. KingandT. Bell: MetalScL, 1974, vol. 8 , p. 253. 6 . A. D. KingandT. Belt: Met. Trans. A, t975, wL 6A, p. t419. 7 . J. K. Lee and H 1. Aaronson: Acta Met., 1968, vol. 16, p . 789.
Development of (110) [001] Texture in Low-Alloy Iron by Primary Recrystallization and Normal Grain Growth
(.) RD
G. C . R A U C H , D . R . T H O R N B U R G , AND K . F O S T E R T h e d i r e c t i o n of e a s i e s t m a g n e t i z a t i o n i n i r o n b a s e a l l o y s i s (001>. F o r t h i s r e a s o n , a s t r o n g (001> d i r e c t i o n a l t e x t u r e is d e s i r e d in i r o n a l l o y s f o r m a g n e t i c a p p l i c a t i o n s . T h i s g o a l h a s b e e n a c h i e v e d in r e l a t i v e l y pure iron, ~'~ 0.8 pct Si-Fe,~ and 3 pct Si-Fe4'5
by controlling composition and processing to produce a strong (I00) [001] texture. This strong texture has invariably been obtained by secondary recrystallization from a primary recrystallized matrix, using inhibitors to restrain normal grain growth. T h e m a t r i x t e x t u r e i s c o m p l e x , w i t h (110) [001] u s u a l l y o n l y a w e a k c o m p o n e n t .B I n f a c t , t h e (100) [001 ]
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