Humidity-induced hydrogen embrittlement in an Fe-Cr-Co magnet alloy
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Humidity-Induced Hydrogen Embrittlement in an Fe-Cr-Co Magnet Alloy S. JIN, N. V. G A Y L E , C. T . CHEN, J . R. L I C H A M E R , AND C. G H I L A R D U C C I H y d r o g e n e m b r i t t l e m e n t in f e r r o u s a l l o y s has b e e n s t u d i e d e x t e n s i v e l y . ~-~ It is w e l l known that h y d r o g e n e m b r i t t l e m e n t can be c a u s e d by i n t e r n a l l y p r e s e n t h y d r o g e n , a h y d r o g e n e n v i r o n m e n t , or c h e m i c a l r e actions involving hydrogen. While there are many p o s s i b l e s o u r c e s of h y d r o g e n , the p r e s e n t i n v e s t i g a t i o n d e a l s with the i n t e r n a l l y p r e s e n t h y d r o g e n i n t r o d u ced d u r i n g i n t e r m e d i a t e al l o y p r o c e s s i n g . H e a v i l y cold r o i l e d s t r i p s of an F e - 2 8 C r - 1 0 . 5 Co m a g n e t alloy% 8 ( C h r o m i n d u r II) c u r r e n t l y u s e d in the B e l l S y s t e m ' s U - t y p e t e l e p h o n e r e c e i v e r is c o m m e r cially solution (recrystallization) annealed near 930~ f o r 30 m i n and w a t e r q u e n c h e d to a c h i e v e a w e l l r e c r y s t a l l i z e d , fine g r a i n e d , b c c ot s t r u c t u r e p r i o r to cold f o r m i n g into cup sh ap e and f i n a l aging t r e a t m e n t . B e c a u s e of the l a r g e quantity i n v o l v e d , the s o l u t i o n a n n e a l i s c a r r i e d out c o m m e r c i a l l y u n d e r an i n e x p e n s i v e n i t r o g e n g as a t m o s p h e r e to m i n i m i z e s u r f a c e o x i d a t i o n
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