Method for preparing a nickel-based alloy

US11306380B2 · kind B2 · utility

Assignee

• VDM Metals International GmbH · DE

Inventors

• Bodo Gehrmann · Plettenberg, DE
• Burkhard Erpenbeck · Kürten, DE

Key dates

• Filing date: Dec 3, 2018
• Grant date: Apr 19, 2022
• Expiry date: Jun 21, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C19/056
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In a method for preparing a nickel-based alloy, an electrode is produced by VIM, VOF or VLF, heat-treated in a furnace between 500 and 1300° C. for 10 to 336 hours to reduce stresses and aging, the heat-treatment being conducted for at least 10 hours and at most 48 hours at 1000° C. to 1300° C., and cooled to between room temperature and less than 900° C., then remelted using ESR at 3.0 to 10 kg/minute to form an ESR block which is cooled to between room temperature and less than 900° C., and remelted again using VAR at 3.0 to 10 kg/minute and a remelting rate fluctuation range of less than 15%, preferably 10%, ideally 5%; the remelted VAR block is heat-treated between 500 and 1250° C. for 10 to 336 hours, then shaped into the desired product shape and dimension by hot or cold forming.