Fractographic characteristics of a hydrogen-charged AISI 316 type austenitic stainless steel
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Fractographic Characteristics of a Hydrogen-Charged AISI 316 Type Austenitic Stainless Steel H A N N U H A N N I N E N AND T E R O H A K K A R A I N E N
Fig. 4-Fracture surtaces (SEM) of Ni-20 Cr-2 ThO 2 fractured at room temperature, a~ (a) Without hydrogen, (b) Hydrogen-charged, same magnification as (a).
W e a p p r e c i a t e p r o v i s i o n of u n p u b l i s h e d f r a c t o g r a p h s b y H. L . G e a r h a r t a n d C. C h e n , a n d a s s i s t a n c e w i t h n o m e n c l a t u r e b y J . C. W i l l i a m s . T h i s w o r k w a s c o n d u c t e d a s p a r t of t h e I n d e p e n d e n t R e s e a r c h a n d D e v e l o p m e n t P r o g r a m of R o c k w e l l I n t e r n a t i o n a l , w h e n b o t h authors were at the Science Center; subsequent partic i p a t i o n of o n e of u s (AWT) w a s s u p p o r t e d b y t h e National Science Foundation, Grant DMR 78-00723.
1. C. D. Beachem and R. M. N. Pelloux: Fracture Toughness Testing and lts Applications (STP 381), pp. 210--44, ASTM.,PhiladelphiaPA, 1965. 2. A. Phillips,V. Kerlins, R. A. Rawe, and B. V. Whiteson:Electron Fractography Handbook, Report AFML-TR-64-416,Air Force SystemsCommand, Wright-PattersonAFB, Ohio, January 1965. 3. A. Phillips,V. Kerlins, R. A. Rawe, and B. V. Whiteson:Electron Fractography Handbook, MCIC-HB-08,Metalsand CeramicsInf. Center, Columbus, Metals and CeramicsInf. Center, Columbus,OH, June 1976. 4. Metals Handbook, 8th ed., vol. 9, ASM,MetalsPark, OH, 1974. 5. C. Cmssard, R. Borione, J. Plateau,Y. Morillon,and F. Maratray: J. Iron Steellnst., 1956, vol. 183, pp. 146-77. 6. C. Chen, A. W. Thompson, and I. M. Bemstein: in press, Oroc. 5th Bolton Landing Conf., Claitor's, Baton Rouge, LA. 7. J. C. Chesnutt and R. A. Spurling:Met. Trans. A, 1977, vol. 8A, pp. 216-18. 8. A. W. Thompson and J. C. Williams:Fracture 1977, vol. 2, pp. 343-48, Proc. 4th Int. Conf. on Fracture, Univ.Waterloo Press,Waterloo,Ontario, 1977. 9. A. W. Thompson and I. M. Bernstein:Hydrogen in Metals, vol. 10, paper 3A6, Proc. 2nd Int. Congress,PergamonPress, NY, 1977. 10. A. W. Thompson: Met. Trans., 1974, vol. 5, pp. 1855q51. 11. A. W. Thompson: Environmental Degradation of Engineering Materials, pp. 3-17, VPI Press, Blacksburg,VA, 1977. 12. A. W. Thompson and 1. M. Bernstein: Fracture 1977, vol. 2, pp. 249-54, l196-VOLUME 10A, AUGUST 1979
It h a s b e e n s h o w n t h a t t h e d u c t i l i t y of a u s t e n i t i c stainless steels is reduced by charging with hydrogen through cathodic polarization or in a hydrogen atm o s p h e r e , 1-4 b u t t h e b a s i c f r a c t o g r a p h i c f e a t u r e s associated with hydrogen induced reduced ductility have not been established in detail. In the present w o r k t h e h y d r o g e n e m b r i t t l e m e n t of a n AISI 316 s t e e l ( T a b l e I) w a s s t u d i e d b y c h a r g i n g i t w i t h h y d r o gen through cathodic polarization and by subsequent tensile testing. T h e t e n s i l e s p e c i m e n s ( F i g . 1) w e r e p r e p a r e d b y c o l d r o l l i n g a p l a
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