Solidification of a laser melted nickel-base superalloy
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Solidification of a L a s e r M e l t e d N ickeI-Base Superalloy
CO2 CW LASER BEAM, lii li'/
LONGITUDINAL
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SECTO IN
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S. L . N A R A S I M H A N , S. M . C O P L E Y , E . W . V A N S T R Y L A N D , A N D M . BASS This p a p e r d e s c r i b e s an investigation of the m i c r o s t r u c t u r e of r e s o l i d i f i e d z o n e s f o r m e d by l a s e r m e l t i n g s i n g l e c r y s t a l s of t h e n i c k e l b a s e s u p e r a l l o y U d i m e t 7 0 0 . * M e l t i n g w a s c a r r i e d out e m p l o y i n g a * U d i m e t 7 0 0 , wt p c t
Ni Bal
Co 18.~
Cr 15.O
Ti 3.5
AI 4.3
Mo 5.3
C 0.08
B 0.030
c o n t i n u o u s w a v e c a r b o n d i o x i d e l a s e r o p e r a t e d i n the T E M o o m o d e ( G a u s s i a n s p a t i a l d i s t r i b u t i o n of i n t e n s i t y ) a t i n c i d e n t p o w e r of 200 W . T h e l a s e r b e a m w a s f o c u s s e d t o a d i a m of 140 ~ m ( 1 / e 2 p o i n t i n i n t e n s i t y ) g i v i n g a n i n c i d e n t p o w e r d e n s i t y of 1.3 M W
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Z TRANSVERSE SECTION Fig. l-Experimental arrangement for sample irradiation.
• c m -2 .
A s i n g l e c r y s t a l of U d i m e t 700 w a s m o u n t e d on a t r a n s l a t i o n s t a g e w i t h a {100} s u r f a c e p e r p e n d i c u l a r t o t h e l a s e r b e a m . T h e s u r f a c e w a s t h e n m e l t e d by i r r a d i a t i n g i t w h i l e i t w a s t r a n s l a t e d a l o n g
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