The effect of ultrasonic irradiation on hardenability of 4340 steel
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The Effect of Ultrasonic Irradiation on Hardenability of 4340 Steel J. M. LIN AND E. P . K L I E R THE r e s u l t s of h e a t - t r e a t i n g s t e e l s in u l t r a s o n i c a l l y i r r a d i a t e d m e d i a h a v e b e e n found to v a r y with the a l l o y c o n t e n t in the s t e e l and the type of h e a t - t r e a t m e n t s . Inv e s t i g a t i o n s on the e f f e c t of u l t r a s o n i c i r r a d i a t i o n d u r ing a n n e a l i n g of s t e e l s h a v e r e v e a l e d that the g r a i n s i z e of a 0.07 pct C h y p o e u t e c t o i d s t e e l w a s r e f i n e d and the h a r d n e s s w a s i n c r e a s e d . 1'~ On the o t h e r hand, g r a i n g r o w t h was p r o m o t e d in s a m p l e s of 1.05 and 1.2 pct C h y p e r e u t e c t o i d s t e e l t r e a t e d with low i n t e n s i t y ultrasonic energy during polymorphic transformat i o n . ~'3 Study of the h a r d e n a b i l i t y of AISI s t e e l s 1045, 1095, and 8640 w e r e a l l found to i n c r e a s e with the e x p o s u r e to u l t r a s o n i c i r r a d i a t i o n , the i n c r e a s e w a s m o s t p r o n o u n c e d in AISI 1045 s t e e l , and l e s s s i g n i f i c a n t in AISI 8640 s t e e l . 4 T h e l a c k of c o n s i s t e n t d a t a h a s t h u s p r o m p t e d t h i s s t u d y of the e f f e c t of u l t r a s o n i c i r r a d i a t i o n on the h a r d e n a b i l i t y of a d e e p h a r d e n i n g 4340 s t e e l . T h e 4340 s t e e l u s e d h a d the f o l l o w i n g c h e m i c a l c o m p o s i t i o n s : 0.41 pct C; 1.83 pct Ni; 0.79 pct C r ; 0.23 pct Mo; 0.31 pct Si with t r a c e s of s u l f u r and p h o s p h o r u s . In a d a p t i n g to the c o o l i n g j a c k e t f o r p r o t e c t i n g the p i e z o e l e c t r i c t r a n s d u c e r u s e d in i n t r o d u c i n g the u l t r a s o n i c e n e r g y , the J o m i n y e n d - q u e n c h t e s t s a m p l e w a s m a c h i n e d into a 1 - i n . d i a m by 14-in. long r o d . J. M. LIN is Assistant Professor of Basic Engineering, Parks College of Aeronautical Technology, Saint Louis University, Cahokia, Illinois. E. P. KLIER is Consultant, Syracuse, N. Y. Manuscript submitted March 26, 1969. METALLURGICAL TRANSACTIONS
T h i s w o r k w a s p e r f o r m e d at the U n i v e r s i t y of N e w c a s t l e upon T y n e and M c M a s t e r U n i v e r s i t y a n d s u p p o r t e d by g r a n t s f r o m the U n i t e d K i n g d o m S c i e n t i f i c R e s e a r c h C o u n c i l and the D e f e n c e R e s e a r c h B o a r d of C a n a d a .
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