Iron fiber-copper composites of small fiber diameters
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lsopleth Cut Number
Eutectic Phases,Atomic Fraction Matrix - Carbide
1" 2t 3 :~
Coo.62Cro.3s -- Cr6.sCoo.TCs Coo.67Cro.33 - Cr6.1sCoo.ssCs Co0.74Cr0.26 - Crs.TsCot.2sC3
Matrix Composition,wt pet Co Cr 65 69.5 -+0.5 76
35 30.5 + 0.5 24
Carbide Composition,wt pet Co
Cr 80.5 79.5 + 0.5 73
10.5 11.5 -+0.5 18
C 9* 9 9
*The carbon content of the carbide was not determinedexperimentallybut was alwaysassumedto be the stoichiometricamount in CrT_xCOxC3. tDetermined from 6 different alloysin the same cut. SDeterminedfrom the eutectic alloy only.
CUT
CUT
3
1
1800
t800
T
t600
1600
1400
1400
t'0
~'0
~0
4'0 wt %
t'0 2b P CCarbide
3'0
40
Fig. 2--DTA r e s u l t s for alloy s e r i e s c l o s e s t to pseudobinary cut.
w h e r e M e = F e , C o , Ni a n d c o m b i n a t i o n s t h e r e o f . W e w i s h t o a c k n o w l e d g e t h e h e l p of M r s . R. S e b a l ] a n d M r . F . H e d i g e r w h o s e t up e x p e r i m e n t a l e q u i p m e n t a n d p r e p a r e d s o m e of t h e a l l o y s , M r s . B . H S h n , Messrs. Bhend and Keller who were responsible for the m e t a l l o g r a p h y and M r s . Fri~hauf and D r . Hugi who p r o v i d e d the m i c r o p r o b e a n a l y s i s , C r i t i c a l r e a d i n g by G. E . H o l l o x i s a l s o g r a t e f u l l y a c k n o w l e d g e d .
1. E. R. Thompson,D. A. Koss,and J. C. Chestnutt: Met. Trans., 1970, vol. 1, pp. 2807-13. 2. W. KSsterand F. Sperner:Archiv. Eisenhhettenw., 1955, vol. 26, pp. 555-59. 3. E. R. Thompsonand F. D. Lemkey:Met. Trans., 1970, vol. 1, pp. 2799-2806. 4. H. G. Wiedemann:Chemie.lng.-Technik.,1964, vol. 36, pp. 1105-14. 5. K. A. Jacksonand J. D. Hunt: Trans. TMS-AIME, 1966, vol. 236, pp. 1129-42. 6. S. Nagakura and S. Oketani: Trans. Iron SteelInst. Japan, 1968, vol. 8, pp. 26594. 7. K. A. Jackson: Trans. TMS-AIME, 1966, vol. 236, pp. 843-52. !
T t6oo
~
Iron Fiber-Copper Composites of Small Fiber Diameters
1600
1400
G. G A R M O N G , S . J .
W E I D E N S C H I L L I N G , AND
L. A. SttEPARD
io
~o
~o
wt %
* c Carbide
"
8o
Fig. 3--DTA r e s u l t s for alloys neighboring pseudobinary cut.
Table II I. Liquidus Slopes m in Three Cuts Near the Pseudobinary Col.x.yCrxCy - CrT.xCoxC 3 Eutectic
deg]wt Fraction
Cut 1 Cut 2 Cut 3
m, Matrix
m, Carbide
208 177 170
724 620 630
t h a t on the COl_xCr x s i d e . C o n s i d e r i n g the c r y s t a l l o g r a p h i c a l l y i s o t r o p i c n a t u r e of t h e m a t r i x (fee) a n d the v e r y c o m p l e x c r y s t a l s t r u e t u r e of t h e c a r b i d e ( c o m p l e x h e x a g o n a l w i t h 60 a t o m s p e r u n i t c e l l ) 8 t h i s o b s e r v a t i o n i s n o t s u r p r i s i n g . It i s a l s o in a c c o r d w i t h the n o n f a c e t e d - f a c e t e d t y p e c r y s t a l l i z a t i o n 7 w h i c h i s f o u n d in t h i s c l a s s of Me1_ x C r x - - C r 7 _ x M e x C 3 e u t e c t i c s METALLURGICAL TRANSACTIONS
THERE a r e s e v e r a l m e t h o d s a v a i l a b l e to p r o d u c e f i b e r c o
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