Method of manufacturing sheets made of alloy 718 for the superplastic forming of parts therefrom

US6328827A · kind A · utility

Assignee

• Societe Nationale d'Etude et de Construction de Moteurs d'Aviation - S.N.E.C.M.A · FR

Inventors

• Mohamed Bouzidi · Choisy-le-Roi, FR
• Philippe Caburet · Chaumont, FR
• Pierre Clement · Valentigney, FR
• Andre Collot · Mennecy, FR
• Jean-Lou Lebrun · Palaiseau, FR
• Benoit Marty · Voisins-le-Bretonneux, FR

Key dates

• Filing date: Jul 5, 1995
• Grant date: Dec 11, 2001
• Expiry date: Jul 5, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22F1/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In order to obtain sheets made of a nickel-based superalloy of type 718 having properties of superplasticity, the sheets are manufactured with a final cycle comprising the steps of: PA1 a) solution treatment at 1060.degree. C. for 15 minutes; PA1 b) precipitation at 730.degree. C. to 800.degree. C. for 1 to 2 hours; PA1 c) cold rolling at a ratio greater than 60%, and PA1 d) recrystallization at 900.degree. C. for 30 minutes. Superplastic deformation of such sheets is carried out at about 970.+-.10.degree. C. and under pressures inducing stresses between 45 and 60 MPa.