Thermomechcmical processing of Inconel 718 by shock-wave deformation
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EXPERIMENTAL
PROCEDURE
Inconel 718 sheet, of thickness 0.093 in. (2.36 mm), was obtained from Active Alloys, Inc., in a solution
annealed condition [1750~F (954~ meeting AMS 5596C. The material was taken from two different heats, I and IL with chemical analyses given in Table I. Table II provides details of the two standard heat treatment schedules, designated 1 and 2, which a r e r e c o m m e n d e d for Imconet 718. D e f o r m a t i o n was i m p a r t e d e i t h e r b y c o l d r o i l i n g to
Table L C ~ I
METALLURGICAL TRANSACTIONS A
for Inconel 718, Wt Pet
Hement
Heat I
Heat tl
AI B C Cb+Ta Co C~ Cu Fe Mn Mo Ni p Si S Ti
0.48 0.003 0,07 5,18 0.39 18,47 0.04 17,86 0.09
0,51 0.004 0.04 5.13 0.19 17,98 0.03 20,05 0.08
3.06
3.00
53.38 0204 0.08 0.006 0.89
3!.79 0.005 0.09 0,005 tA0
Table II. Thermal and Thermomechanical Processing Schedules for In9
ScheduleCode
SolutionTreatment
718
AgingSequence
t and(TMP-t)* 1750~176 I h, AC (+ coldwork*)
I325~176 FCto I t 50~ (621'~C),Total 18 h, AC
2 and(TMP-2) 1950~ (1066~ (+ coldwork)
t400~ (760~ 10 h, FC to 1200~ (649~ Total 20 h, AC
3 and (TMP-3) t 750~ (954~
MARCA. MEYERS is Associate Professor, S e r e de Ci~ncia dos Materials, hlstituto Militar de Engenharia, P~a. Ten. Tibfircio, Urca, Rio de Janeiro, RJ, Brasit. R. NORMAN ORAVA is Professor, Department of Metallurgical Engineering, South Dakota School of Mines and Technology, Rapid City, SD 57701. Manuscript submitted May 12, 1975.
Ana~
1 h, AC 1 h, AC
1300~ (704~ 4 h, AC; (+ cold work) t250~176
i 150~176
FC1n I h to AC
*TMP-tR, Z~, 3R: cold roiledto 9t.t pet reductionin thickness. TMP-tS, 7_S,3S: shockloadedto 510 Kb~r. VOLUME 7A, FEBRUARY 1976--I79
19.1 pct r e d u c t i o n in t h i c k n e s s , or by explosive shock loading to a peak p r e s s u r e of 510 Kbar. F o r T M P util i z i n g Schedule 1 and 2 heat t r e a t m e n t s , i.e. Schedules T M P - 1 and T M P - 2 , cold w o r k i n g was p e r f o r m e d in the solution t r e a t e d condition, followed t h e r e a f t e r by the s t a n d a r d aging s e q u e n c e i n d i c a t e d in Table H. Schedules T M P - 1 R and T M P - 1 S , for example, apply then to c o n v e n t i o n a l and shock TMP, r e s p e c t i v e l y . The d i s c u s s i o n for Schedule 3, and T M P - 3 w h e r e s t r a i n i n g is p e r f o r m e d a f t e r a p a r t i a l aging t r e a t m e n t , is r e s e r v e d for a l a t e r s e c t i o n . A p l a n a r shock wave of peak p r e s s u r e 510 Kbar and 1 - p s d u r a t i o n was i n t r o d u c e d at a m b i e n t t e m p e r a t u r e by the p a r a l l e l i m p a c t with the s p e c i m e n of a 3 m m thick copper d r i v e r plate. This was a c c e l e r a t e d exp l o s i v e l y by m e a n s of a p a r a l l e l - p l a t e p l a n e - w a v e g e n e r a t o r , u s i n g DuPont Detasheet C p l a s t i c sheet explosive. Care was taken to p r o p e r l y m o m e n t u m t r a p the s p e c i m e n to p r e v e n t s p a l l a t i o n , and to m i n i m i z e the effect
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