Tensile and creep properties of the experimental oxide dispersion strengthened iron-base sheet alloy MA-956E at 1365 K
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Fe-20Cr-4.5AI-0.5Ti-0.5Y203.4 This a l l o y is available in both bar and sheet forms. The work described herein is the result of a preliminary investigation of the 1365 K mechanical properties of MA-956E alloy sheet.* Short-term 1365 K *The material provided for this investigation was produced during the alloy development program. Subsequent changes in composition and processing have been made by the producer. Therefore, the properties measured here do not necessarily reflect those of the alloy in its present form. Private communication: J. J. Fischer, International Nickel Company, Inc.
t e n s i l e t e s t s , 1365 K t e n s i l e c r e e p t e s t s , and r o o m t e m p e r a t u r e t e n s i l e t e s t s following c r e e p t e s t i n g w e r e conducted in an e f f o r t to identify the s i m i l a r i t i e s and d i f f e r e n c e s in b e h a v i o r b e t w e e n oxide d i s p e r s i o n s t r e n g t h e n e d N i - b a s e and F e - b a s e a l l o y s . E X P E R I M E N T A L PROCEDURE Material A n o m i n a l l y 0.35 by 0.35 m by 0.20 c m t h i c k p i e c e of MA-956E was obtained f r o m the I n t e r n a t i o n a l N i c k e l Company, Inc. The m a t e r i a l was in the fully r e c r y s t a l l i z e d condition with a g r a i n s t r u c t u r e c o n s i s t i n g of v e r y l a r g e p a n c a k e s h a p e d g r a i n s with the s h o r t d i m e n s i o n p a r a l l e l to the s h e e t t h i c k n e s s . In g e n e r a l , the s h e e t t h i c k n e s s c o n t a i n e d f r o m two to t e n g r a i n s which w e r e of the o r d e r of 1 c m o r l a r g e r in d i a m e t e r in the plane of the s h e e t . A t y p i c a l p h o t o m i c r o g r a p h of the m i c r o s t r u c t u r e of the s h e e t a l l o y is p r e s e n t e d in F i g . 1. T h e s h e e t p o s s e s s e d a p r e f e r r e d o r i e n t a t i o n ; h o w e v e r , the e x a c t o r i e n t a t i o n v a r i e s within the s h e e t . F o u r d e t e r m i n a t i o n s of the o r i e n t a t i o n w e r e m a d e f r o m r a n d o m l y s e l e c t e d s p e c i m e n s . Two s p e c i m e n s y i e l d e d (126)[7til] with (126) p a r a l l e l to the s h e e t s u r f a c e and the [7til] p a r a l l e l to the s h e e t r o l l i n g d i r e c t i o n . T h e o t h e r s p e c i m e n s i n d i c a t e d (125)[311 ] and s o m e t h i n g c l o s e to (307)[532]. T h e l a t t e r o r i e n t a t i o n is s o m e w h a t r e m o v e d f r o m the o t h e r two. The t e x t u r e was a l s o m e a s u r e d at the c e n t e r of the s h e e t t h i c k n e s s , and it was found to be i d e n t i c a l to the s h e e t s u r f a c e . C h e m i c a l a n a l y s i s of this s h e e t m a t e r i a l gave the following c o m p o s i t i o n (wt pct): 18.9Cr, 4.4AI, 0.5Ti, 0.36Ni, 0.235 O (total), 0.044N, 0.002C, and a p p r o x i m a t e l y 0.5Y203. T h e d i s p e r s o i d s i z e and v o l u m e f r a c t i o n and d i s l o cation density were determined. Transmission elec-
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