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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