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PROCESSING AND PROPERTIES OF 2091 AND8090 FORGINGS

D. Marchive, M. Charue

To cite this version:

D. Marchive, M. Charue. PROCESSING AND PROPERTIES OF 2091 AND8090 FORGINGS. Journal de Physique Colloques, 1987, 48 (C3), pp.C3-43-C3-48.< 10.1051/jphyscol:1987306 > . < jpa-00226529>

HAL Id: jpa-00226529https://hal.archives-ouvertes.fr/jpa-00226529

Submitted on 1 Jan 1987

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However su ch a c o n d i t io n r e s u l t s i n l ow e r d u c t i l i t y ( l o ss o f t o 3 o n f r a c t u r ee l o n g a t i o n ) .

B o t h a l l o y s (8 09 0 an d 2 09 1) show t h e same a n i s o t r o p y w i t h a l o s s o f s t r e n g t h a t60° C.

1.5 C o n c l u s i o n

S t r i c t l y s p e a k i n g , t h e r e pl ac e m e n t o f 7 07 5 T73 p r e c i s i o n d i e f o r g i n g s b y A 1- Li p a r t sw i t h same p r o p e r t y l e v e l s i s n o t p o s s i b l e f o r t h e t i m e b e i n g . B u t FORGEAL i s now a b l et o o f f e r t h e t h r e e f o l l o w i n g p r o p e r t y c om b in atio ns u s i n g 8090 a nd 2091 i n d i f f e r e n ttempers

Ta b l e 4 : C o m pa ris on o f2091 T6, 2091

t h r e e p o s s i b leT7x, 8090 T6

p r o p e r c o m b i n a t i o n s f o r p r e c i s i o n f o r g i n g s

The Aerospace indus t ry w i l l choose s u i t a b l e a l l o y a n d -t em p e r a c c o r d in g t o t h e r e q u i -r e d w or k in g c o n d i t i o n s o f e ac h p a r t .

2 - THICK HAND FORGINGS AN0 D IE FORGINGS2 1 8 0 9 0 a l l o y

F i g . 3 shows a n a i r c r a f t w he el u s i n g 8 090 a l l o y . The t y p i c a l l e v e l s o f m ec h an ic alp r o p e r t ie s o b t a i ne d under T6 c o n d i t io n f o r t h i s p a r t a r e i n t h e f o l l o w i n g t a b l e

Ta b l e 5 Ty p i c a l m e c h an ic al p r o p e r t i e s

D i r e c t i o n

Long

Transve r se

One may see t h a t TS an d YS a r e s a t i s f a c t o r y a s co mpared w i t h v a l ue s o b t a i n e d u s i n gc o n ve n ti o n al a l l o y s , b u t f r a c t u r e e l o n g a t i o n va lu e s a r e n o t s u f f i c i e n t m a i n ly i n t h et r a n s v e r s e d i r e c t i o n .

W i t h i n t h e n e x t f ew m o nth s on e o f FORGEAL s t a rg e t s f o r t h i c k p r o d u c t s w i l l b e t o im -p ro ve t h e d u c t i l i t y i n th e s h o r t t r an s ve rs e d i r e c t i o n by o p t im i z i n g t h e q u a l i t y o fm e t a l , t h e p r o d u c t i o n p r o c e ss e s an d h e a t t r e a t m e n t s .

TS ( M P ~ )

510

490

YS (MPa)

470

450

EL ( )

4

2,5


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C3 46 JOURNAL DE PHYSIQUE

2 2 2091 hand fo rq inqs

Hand f o rg e d b l o c k s o f t h i c k n e s s e s r a n g i n g fro m 6 0 t o ~ 1 5 0m have been produced us ing2 0 9 1 a l l o y.

l l c a r a c t e r i z a t i o n s w ere m ade a f t e r c o l d c o m pr es si on 3 i n t h e s h o r t t r a n sv e r s ed i r e c t i o n ) i mm e di atl y a f t e r q ue nc hi ng .

O J

1352 12 0 H 11 2 4 H 48 H 17 I1 AG EI NG135.C l4l.C I4S.C 150.C ISP C IG 04 C TA E AT Y E I ~ I S

The t a b l e sh ow s t h e me ch an ic al p r o p e r t i e s e v o l u t i o n a s a f u n c t i o n o f t h e a g e i ngt re a tm e n t. An i m p o rt an t l o s s o f d u c t i l i t y a sw e l l a s a c o n s i d e ra b l e r e d u c ti o n i n t h ep l a s t i c f i e l d w i l l appear when the maximum T6 hardness i s r eached .

s lW l

I f t h e re p la c em e n t o f c o n v en t io n a l a l l o y s i s for se en , then two co nd i t i on s may be con-s i d e r e d :

ts lW.s o 0 .

4SO .

4 0 0

350

.

s o 0 .

- t h e T852 co nd i t io n which cor resp onds t o maximum s t r en g th and would a l low th e r ep la -cement o f a l lo ys such a s 2214 o r 7075.Two p ro p e r t ie s s t l l re ma in a t a low l e v e l a s f o r t h e 8 09 0 a l l o y ) s e e t a b l e 7 :t h e f r a c t u r e e l o n g at i o n i n t h e s h o r t tr a n s v e r s e d i r e c t i o n a nd t h e f r a c t u r e th ou gh -n e ss i n t h e S-L d i r e c t i o n .

4-.- _

4+ +

+

Table : Ageing curve on fo rged b lock so e i n 2 09 1

8 Thickness 120Cold comressed irnmediatlya f t e r q u e n c h i n g : 3S-T

Ta b l e 7


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The stress corrosion resistance in the short transverse direction is equivalent tothat of 2214 T6 alloy, hence not sufficient enough to allow the replacement of the7000 series alloys.

The T8x52 condition corresponding to an ageing treatment of 1 2 H at 135O C, whichis sufficient to obtain the property levels of 2024 T352 for thickness up to150 mm see table 8 .

Table 8

2 3 Conclusion

Under heat treatment conditions reaching the maximum strength, the 2091 and 8090alloys show an insufficient ductility in the short transverse direction in the bothcases of hand forgings and die forgings.

Research work is going on to replace high strength alloys such as 2214 or 7xxx.

On the other hand, under T8x52 cohdition, 2091 alloy shows properties equivalent tothose of 2024 T352 for plates and forged parts.

3 OVERALL CONCLUSIONS

Based on all the above results the precise use of A1-Li forgings is still being in-vestigated with customers, with attractive property combinations already availablefor some applications.


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3-48 J O U R N L DE PHYSIQUE

F i g 1 Selection of Al-Li precision die forgings Courtesy of AMD/BA

i g.2 Airbus A320 Window f r ame F i g 3 Aircraft wheel using 8 9C o u r t e s y of AEROSPATIALE courtesy o MESSIER-HISPANO-BUGATTI

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