Recrystallization of high carbon steel between intervals of high temperature deformation
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Recrystallization of High Carbon Steel Between Intervals of High Temperature Deformation R. A. P. DJAIC AND J. J. JONAS
IN a r e c e n t paper,1
some preliminary results were r e p o r t e d c o n c e r n i n g the r e c r y s t a l l i z a t i o n of p l a i n c a r bon s t e e l s between i n t e r v a l s of hot working. The t e s t s w e r e c o n c e r n e d with the p r o g r e s s of softening in the a u s t e n i t e p h a s e , a r e g i o n which cannot r e a d i l y be i n vestigated by c o n v e n t i o n a l m e t a l l o g r a p h i c ,2 X - r a y , 3 and h a r d n e s s t e s t i n g 3 t e c h n i q u e s . In our e a r l i e r p a p e r , we c a m e to the t e n t a t i v e c o n c l u s i o n that t h r e e d i s t i n c t static softening m e c h a n i s m s w e r e o p e r a t i n g at high t e m p e r a t u r e s . In the p r e s e n t note, we r e p o r t s o m e m o r e c o n c l u s i v e evidence r e g a r d i n g the o p e r a t i o n of these t h r e e m e c h a n i s m s and d e s c r i b e a m o r e c o m p l e t e model c o n c e r n i n g t h e i r i n t e r a c t i o n . The p r e s e n t method is based on the p r i n c i p l e of i n t e r rupted m e c h a n i c a l t e s t i n g and is a m o d i f i c a t i o n of the a p p r o a c h o r i g i n a l l y developed for the Gleeble t e s t i n g machine.4-6 Our technique m a k e s use of an I n s t r o n t e s t e r modified for c o n s t a n t t r u e s t r a i n rate hot c o m p r e s s i o n ; it was employed to study the softening b e h a v i o r of AISI C 1060 s t e e l , the c o m p o s i t i o n of which
R. A. P. DJAIC and J. J. JONAS are Graduate Student and Associate Professor, respectively, Department of MetallurgicalEngineering, McGill University, Montreal, Canada. Manuscript submitted August 14, 1972. METALLURGICAL TRANSACTIONS
that the t e r n a r y alloy is e s s e n t i a l l y Fe2AI~ with some s u b s t i t u t i o n a l zinc a t o m s . D i f f e r e n c e s in the r e l a t i v e peak i n t e n s i t i e s for the t e r n a r y and Fe2A15, e s p e c i a l l y in the s t r o n g e s t a b s o r p t i o n r e g i o n s u g g e s t s that s u b stitution is confined to one type of a t o m . T h i s is s u p p o r t e d by the c o m p o s i t i o n of the t e r n a r y d r o s s s a m p l e s which indicate that only a l u m i n u m a t o m s a r e r e p l a c e d as, with only a few exceptions, the i r o n at. pct was b e tween 27.5 and 29.5 pct ( c . f . 28.6 pct for Fe2Als). Hence the t e r n a r y p r o b a b l y can be r e p r e s e n t e d a s Fe2Al(5_x}Znx where x for all the t e r n a r y s a m p l e s a n a l y z e d both in g a l v a n i z e d coatings and d r o s s s a m p l e s is in the r a n g e 0.5 to 0.8 We thank John Lysaght ( A u s t r a l i a ) L i m i t e d for p e r m i s s i o n to p u b l i s h this work. I. H. Bablik:Galvanizing {Hot Dip), 3rd ed., pp. 204-23,SponLtd., London, England,1950. 2. M. A. Haughton:Proc. 2nd Intern. Conf. on Hot Dip Galvanizing, Dfisseldorf, 1952, editedby ZincDevelo
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