Periodicity in the interaction of hydrogen in liquid iron alloys
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W+GB A plot of e x p e r i m e n t a l v a l u e s of a ( corr v s c a l c u l a t e d v a l u e s is shown in F i g . 2. With the exception of one point at 11 pct d e v i a t i o n , a l l the data f a l l within • pct of the c a l c u l a t e d f r a c t u r e s t r e s s v a l u e . T h e e r r o r in in the c a l c u l a t i o n s , a r i s i n g out of e x p e r i m e n t a l e r r o r , is e s t i m a t e d at +5 pct. It i s of i n t e r e s t to note f r o m T a b l e I that the equation a p p l i e s to s p e c i m e n s with a s little a s 40 pet of the g r a i n b o u n d a r y c o v e r e d by c o a r s e ot f o r m e d at the solution t r e a t m e n t t e m p e r a t u r e . T h i s i m p l i e s that s u f f i c i e n t s i t e s f o r a viable void n u c l e u s to f o r m at and grow a l o n g the ~-/3 i n t e r f a c e s 2 a r e s t i l l a v a i l a b l e with only a p a r t i a l coverage of the g r a i n b o u n d a r y with c o a r s e or. C r a c k propagation in both equiaxed a and g r a i n boundary a structure proceeds i n t e r g r a n u l a r l y along el-t3 i n t e r f a c e s . 2 When the B-~ g r a i n b o u n d a r i e s a r e not e n t i r e l y c o v e r e d by the c o a r s e a , the r e m a i n i n g s e c t i o n s of the g r a i n b o u n d a r y a r e c o v e r e d by fine ot (less than 0.2~t) which p r e c i p i t a t e s d u r i n g the aging t r e a t -
Periodicity in the Interaction of Hydrogen in Liquid Iron Alloys P. J. DEPUYDT AND N. A. D. P A R L E E S C H E N C K and Steinmetz 1 have d i s c u s s e d the change in the a c t i v i t y of h y d r o g e n in liquid i r o n caused by v a r ious added a l l o y i n g e l e m e n t s with r e s p e c t to position of a l l o y i n g e l e m e n t in the p e r i o d i c t a b l e . T h e y show a gene r a l l y l i n e a r r e l a t i o n s h i p b e t w e e n the i n t e r a c t i o n coeff i c i e n t c~) and the a t o m i c n u m b e r of alloying e l e m e n t X for each period in the table. R e c e n t l y it was n e c e s s a r y for the p r e s e n t a u t h o r s to make a v e r y c r i t i c a l study of h y d r o g e n s o l u b i l i t y data on f o u r t e e n liquid F e - X alloy s y s t e m s in c o n n e c t i o n with a r e s e a r c h on h y d r o g e n diffusion in these a l l o y s . When the v a l u e s of cX d e r i v e d f r o m this c r i t i c a l study w e r e plotted a g a i n s t a t o m i c n u m b e r f o r the p e r i o d s in the p e r i o d i c table involved the r e l a t i o n s t u r n e d out to be f a r f r o m l i n e a r , see Fig. 3. All s o l u b i l i t y data used w e r e collected f r o m the o r i g inal p u b l i c a t i o n s , n e a r l y all of which a r e r e f e r e n c e d by Kunze and S c h S r m a n n in t h e i r r e c e n t v e r y e x t e n s i v e r e view, e and c o n s i d e r e d too n u m e r o u s to be r e f e r e n c e d in a c o m m u n i c a t i o n . S o l u b i l i t i e s m e a s u r e d at t e m p e r a t u r e s somewhat d i f f e r e n t f r o m 16
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