On the correlation of specific fracture surface and metallographic features by precision sectioning in titanium alloys
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On the Correlation of Specific Fracture Surface and Metallographic Features by Precision Sectioning in Titanium Alloys
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8. J. B. Conway: GeneralElectricCompany,Nuclear SystemsPrograms, Cincinnati, Ohio, Report No. GEMP-732, 1969. 9. J. M. Steichen: Trans. ASME, s Eng. Mater. Tech., July 1973, pp. 182-85. 10. C. E. Jaske, H. Mindlin, and J. S. Perrin: ASTMSTP520, pp. 365-76, 1973. 11. L. A. James, Trans. ASME, J. Eng. Mater. Tech., Paper No. 74-Mat-7, 1974, p. 1.
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Fig. 4--Cyclic stress strain properties of Incoloy 800 tested at various temperatures.
r e p o r t e d s i m i l a r r e s u l t s f o r t e n s i l e t e s t s of t y p e 304 s t a i n l e s s s t e e l , a l t h o u g h h i s d a t a s h o w s no s i g n i f i c a n t c h a n g e s in t h e s t r e n g t h a n d d u c t i l i t y a s a f u n c t i o n of s t r a i n r a t e s o v e r t h e t e m p e r a t u r e r a n g e f r o m 316 to 538~ I n c o l o y 800 h a s b e e n k n o w n to h a v e s u p e r i o r m e c h a n i c a l p r o p e r t i e s w i t h r e s p e c t to hot t e n s i l e 8 and c r e e p - f a t i g u el~ p r o p e r t i e s a s w e l l a s b e t t e r f a t i g u e crack propagation characteristics n when compared to t h e o t h e r a u s t e n i t i c s t a i n l e s s s t e e l s . T h e o b s e r v e d s t r e n g t h i n c r e a s e in t h e e l e v a t e d t e m p e r a t u r e m e c h a n i c a l p r o p e r t i e s of I n c o l o y 800 c o u l d be a t t r i b u t e d to t h e e f f e c t of the u n i f o r m d i s p e r s i o n of T i (CN) in t h e m a t r i x and i s of t h e o r d e r t h a t w o u l d be p r e d i c t e d on t h e b a s i s of an O r o w a n t y p e h a r d e n i n g m e c h a n i s m . 3 E v a l u a t i o n of t h e m i c r o s t r u c t u r e and the m e c h a n i c a l b e h a v i o r of I n c o l o y 800 is c o n t i n u i n g . ACKNOWLEDGMENT T h i s w o r k w a s s u p p o r t e d by the U.S. E n e r g y R e s e a r c h and D e v e l o p m e n t A d m i n i s t r a t i o n u n d e r C o n tract No. E(11-1)-2107. 1. T. Slot, R. H. Stentz, and J. T. Berling: ASTMSTP 465, p. 100, 1969. 2. J. B. Conway, R. H. Stentz, and J. T. Berling:Met. Trans., 1972, vol. 3, pp. 1633-37; 3. H. Nahm and J. Moteff: UnpublishedResearch,Universityof Cincinnati, Cincinnati, Ohio, 1975. 4. D. E. Laughlin:ActaMet., 1976, vol. 24, pp. 53-58. 5. ASTMPowder DiffractionFile Card No. 6-0614 and 6-0642. 6. M. J. Donachie,Jr. and O. H. Kriege:J. Mater., 1972, voi. 7, pp. 269-78.
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