Activity of oxygen in liquid iron-group VIII alloys
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Fig. 6--Distortion of imaging r i n g s around a ( l l 0 ) a pole in an F e - 2 pet V-0.2 pet C s p e c i m e n indicating the p r e s e n c e of a s t r a i n e d i n t e r f a c e between f e r r i t e and vanadium carbide. Magnification 1,600,000 times.
The present study complements and substantiates s t u d i e s m a d e on t h e s a m e m a t e r i a l b y t r a n s m i s s i o n e l e c t r o n m i c r o s c o p y 8,9 a n d h a s c o n c e n t r a t e d on t h e
Activity of Oxygen in Liquid Iron-Group VIII Alloys
1. D. M. Schwartz, A. T. Davenport, and B. Ralph: Phil Mag., 1968, vol. 18, p. 431. 2. D. M. Schwartz: Ph.D. Thesis, Universityof Cambridge, Cambridge, 1968. 3. D. M. Schwartz and B. Ralph: Phil. Mag., 1969, vol. 19, p. 1061. 4. D. M. Schwartz and B, Ralph: Phil. Mag., 1969, vol. 19, p. 1069. 5. A. T. Davenport, F. G. Berry, and R. W. K. Honeycomb: Met. Sci. J., 1968, vol. 2, p. 104. 6. A. T. Davenport: Ph.D. Thesis, Universityof Sheffield, Sheffield, 1968. 7. F. G. Berry, A. "I:Davenport, and R. W. K. Honeycombe:Mechanism of Phase Transformation in Crystalline Solids, p. 288, Inst. of Metals, London, 1968. 8. E. Smith: A cta Met., 1966, vol. 14, p. 583. 9. H. Brooks:Metallnterfaces, p. 20, A.SM., 1952.
f u s i o n a n a l y s i s .2 O n l y h i g h p u r i t y e l e c t r o l y t i c m a terials were used in this investigation. T h e a c t i v i t y a n d f r e e e n e r g y of o x y g e n in t h e l i q u i d i r o n a l l o y s w e r e s t u d i e d b y m e a n s of t h e r e a c t i o n ,
E. S. TANKINS H2(g) + O = H z O ( g )
DURING
the past 30 years numerous investigations have been made on the physicochemical behavior of alloying elements in the iron-rich solutions. The mutual effects of elements in liquid iron such as Fe-Y-X (where X is the alloying element and Y represents dilute solutions of C, N, H, S, and O) are gradually becoming better understood. The group VIII elements alloyed with iron represent an interesting series to study. The results of this study, together with the conclusions from earlier investigations, will lead to a better understanding of liquid alloys. A preliminary investigation has been made of equilibrium in the reaction of hydrogen with oxygen in some of the liquid group VIII alloys. The experimental method, which has been described in detail elsewhere, ~ consisted of bubbling accurately known H-Ar water vapor mixtures through the iron-group VIII alloys contained in alumina crucibles within a vertical closed furnace. When equilibrium was reached, the samples were quenched by rapidly lowering the crucible under an atmosphere of argon to a water-cooled brass fixture at the bottom of the furnace tube. The melts were found to freeze from the top in less than 4 sec. The heats were carefully prepared for oxygen analysis. The oxygen content was determined by vacuum E. S. TANKINS is Metallurgist, Aero Materials Department, Naval Air Development Center, Johnsville, Warminster, Pa. Manuscript submitted July 7, 1969. 1066-VOLUME 1,APRIL 1970
K' = PBzo/PH2
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