Distribution of copper between Cu-Au alloys and silica-saturated fayalite slags
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Distribution of Copper Between Cu-Au Alloys and Silica-Saturated Fayalite Slags J.M.
TOGURI AND N. H. SANTANDER
IN a p r e v i o u s p a p e r , 1 we have
r e p o r t e d the s o l u b i l i t y of copper in s i l i c a - s a t u r a t e d fayalite slag in e q u i l i b r i u m with C u - A u a l l o y s at 1300~ as a function of the p a r t i a l p r e s s u r e of oxygen r a n g i n g from 10 -1~ to 10 -7 arm and the a c t i v i t y of copper in Cu-Au a l l o y s . In the p r e s e n t c o m m u n i c a t i o n , we r e p o r t the d i s t r i b u t i o n of gold in the slag and the effect of t e m p e r a t u r e on the s o l u b i l i t y of copper. The slag in a l l c a s e s was s i l i c a s a t u r a t e d (FEO--42.98; Fe203--1.74; and SiOe--55.28) and the e x p e r i m e n t a l p r o c e d u r e was s i m i l a r to that previously described. The d i s t r i b u t i o n of gold in the slag is shown in Fig. 1 w h e r e the p a r t s p e r m i l l i o n of gold in the slag is plotted a g a i n s t the alloy c o m p o s i t i o n for v a r i o u s conditions of t e m p e r a t u r e and oxygen p r e s s u r e . F r o m J. M. TOGURI is Professor, Department of Metallurgy and Materials Science, University of Toronto, Toronto, Ontario, Canada. N. H. SANTANDER, formerly Graduate Student, University of Toronto, is now Assistant Professor, Department of Metallurgy,Universidad Tecnica del Estado, Santiago, Chile. Manuscript submitted September 3, 1971. 586-VOLUME 3, FEBRUARY 1972
i d e n t i c a l , n o n p r e s t r e s s e d s p e c i m e n loaded to the s a m e level. It can be i n f e r r e d f r o m the shape of the c u r v e in F i g . 1 that the s t r e s s - c o r r o s i o n c r a c k v e l o city in the 4340 s t e e l is e s s e n t i a l l y c o n s t a n t and i n d e pendent of s t r e s s i n t e n s i t y above a p p r o x i m a t e l y 20 k s i (Ref. 5). The data obtained for the m a r a g i n g s t e e l indicated s i m i l a r c h a r a c t e r i s t i c s . C o n s e q u e n t l y , the f a i l u r e t i m e s of the p r e s t r e s s e d and n o n p r e s t r e s s e d s p e c i m e n s can be expected to be s i m i l a r , except very c l o s e to the t h r e s h o l d , b e c a u s e a r e d u c t i o n in s t r e s s i n t e n s i t y within the c o m p r e s s i v e s t r e s s zone does not change the c r a c k velocity. It should be noted that in s o m e s t e e l s the s t r e s s c o r r o s i o n c r a c k velocity i n c r e a s e s r a p i d l y with s t r e s s i n t e n s i t y . ~ U n d e r these c i r c u m s t a n c e s the c r a c k v e l o city i n the c o m p r e s s i v e s t r e s s zone can be v e r y m u c h lower than i n a n o n p r e s t r e s s e d s p e c i m e n loaded to the s a m e KIi l e v e l . This would lead to a n i n c r e a s e in the t i m e - t o - f a i l u r e c o m p a r e d to the n o n p r e s t r e s s e d specimen. This work was s p o n s o r e d in p a r t by the Advanced R e s e a r c h P r o j e c t s Agency of the D e p a r t m e n t of Def
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