Three-dimensional view of alumina clusters in aluminum-killed low-carbon steel
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14. L. A. Willey:Aluminum Volume 1, Appendix I, Kent R. VanHorn, ed., American Society for Metals,MetalsPark, Ohio, 1967. 15. H. Hanemann and A. Sehrader: AtlasMetallographicus, III, 2, Tern/ireLegiemngen Des Aluminiums,VeflagStahleisenM. B. H., Diisseldorf,1952. 16. P. N. T. Unwinand G. C. Smith: Z Inst. Metals, 1969,vol. 97, p. 299. 17. A. E Beck and P. R. Sperry: Proceeding of Conference, FundamentalAspects of Stress Corrosion Cracking, at Ohio State University,NACE,Houston, Texas, 1969, p. 513. 18. G. W. Lorimer and R. B. Nicholson:ActaMet., 1966,vol. 14, p. 1009. 19. P. R. Sperry: AIME Trans., 1955, vol. 203, p. 145. 20. A. J. Sedricks,P. W. Slattery, and E. N. Pugh: ASM Trans. Quart., 1969, vol. 62, p. 815. 21. A. J. Sedricks, P. W. Slattery, and E. N. Pugh: ASM Trans. Quart., 1969, vol. 62, p. 238. 22. J. L. Taylor: s Inst. Metals, 1963-64, vol. 92, p. 301. 2652-VOLUME 1,SEPTEMBER 1970
23. J. D. Embury and R. B. Nicholson:ActaMet., 1965, vol. 13, p. 403. 24. N. Ryum: ActaMet., 1968, vol. 16, p. 327. 25. P. N. T. Unwin,G. W. Lorimer, and R. B. Nicholson:ActaMet., 1969, vol. 17, p. 1363.
Three-Dimensional View of Alumina Clusters in Aluminum-Killed Low-Carbon Steel R. A. R E G E , E. S. S Z E K E R E S , AND W. D. F O R G E N G , J R .
ALUMINA
c l u s t e r s and a l u m i n a d e n d r i t e s a r e o f t e n o b s e r v e d in l o w - c a r b o n s h e e t s t e e l s . ''2 T h i s i s i l l u s t r a t e d in F i g . 1 w h i c h is a m i c r o g r a p h of s u c h i n c l u s i o n s in an a s - c a s t 0 . 0 5 C - 0 . 3 0 M n - 0 . 0 2 S i - 0 . 0 6 A 1 s t e e l . To a i d in d e f i n i n g t h e t r u e m o r p h o l o g y of s u c h i n c l u s i o n s , we h a v e d e v e l o p e d a m e t a l l o g r a p h i c t e c h n i q u e f o r v i e w i n g t h e m in t h r e e d i m e n s i o n s w i t h a s c a n n i n g e l e c t r o n m i c r o s c o p e . F o r t h i s p u r p o s e s p e c i m e n s of the s a m e s t e e l w e r e e t c h e d f o r 6 m i n in a 5 p c t s o l u tion of b r o m i n e in m e t h a n o l . When t h e s e d e e p l y e t c h e d s p e c i m e n s a r e v i e w e d in the s c a n n i n g e l e c t r o n m i c r o s c o p e , the d e n d r i t i c n a t u r e of a l u m i n a i n c l u s i o n s i s c l e a r l y a p p a r e n t , a s s h o w n in F i g . 2. In a d d i t i o n , the d e n d r i t e s s e e m to h a v e g r o w n f r o m a s i n g l e p o i n t of i n i t i a t i o n . The t h r e e - d i m e n s i o n a l v i e w of t h e s e d e n -
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Fig. 1--Typical alumina clusters at the quarterthiekness location of a c r o s s section of the a s - c a s t steel. Planar view, unetehed. Magnification 1500 times. R. A. REGE, E. S. SZEKERES, and W. D. FORGENG, JR. are Senior Research Engineers and Associate Research Consultant, respectively, Applied Research Laboratory, U.S. Steel Corp., Monroeville, Pc. Manuscript submitted May 12, 1970. METALLURGICAL TRANSACTIONS
S e v e r a l t e r n a r y CuZn b a s e d fl p h a s e a l l o y s exhibit unusual m e c h
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