A METHOD OF PRODUCING A NICKEL BASE SUPERALLOY.
Application 810/MUMNP/2003 published 2006-05-05, filed 2003-08-28
A method of producing a nickel base alloy includes casting the alloy within a casting mold and subsequently annealing and overaging the ingot at least 1200 ºF (649 ºC) for at least 10 hours. The ingot is electroslag remelted at a melt rate of at least 8 Ibs/min. (3.63 kg/min.), and the ESR ingot is then transferred to a heating furnace within 4 hours of complete solidification and is subjected to a novel post-ESR heat treatment. A suitable VAR electrode is provided form The ESR ingot, and the electrode is vacuum arc remelted at a melt rate of 8 to 11 lbs/minute (3.63 to 5.00 kg/minute) to provide a VAR ingot. The method allows premium quality VAR ingots having diameters greater than 30 inches (762 mm) to be prepared from Alloy 718 and other nickel base superalloys subject to significant segregation on casting. Drawing: 03 Sheets. Total Pages: 31. Fig. 1
Applicant
ATI PROPERTIES, INC.
1600 N.E. OLD SALEM ROAD, ALBANY, OR 97321, UNITED STATES OF AMERICA.
Inventor
1. BETSY J. BOND 2. LAURENCE A. JACKMAN 3. A. STEWART BALLANTYNE
International Info
Classification: C22B 9/18
Publication Number: WO 02/072897
Application Date: 2002-02-25
Priority Information
09/802,064 U.S.A. 2001-03-08