×

Thermo-mechanical processing of nickel-base alloys

  • US 8,652,400 B2
  • Filed: 06/01/2011
  • Issued: 02/18/2014
  • Est. Priority Date: 06/01/2011
  • Status: Active Grant
First Claim
Patent Images

1. A process comprising:

  • a first heating step comprising heating a nickel-base alloy workpiece to a temperature in the range of 2000°

    F. to 2125°

    F.;

    a first forging step comprising rotary forging the heated nickel-base alloy workpiece to a reduction in area of 30% to 70%, wherein the nickel-base alloy workpiece is at a temperature in the range of 2000°

    F. to 2125°

    F. when the first forging step begins;

    a second heating step comprising heating the rotary-forged nickel-base alloy workpiece to a temperature in the range of 1750°

    F. to 1925°

    F., wherein the rotary-forged nickel-base alloy workpiece is maintained at elevated temperature and not permitted to cool to ambient temperature between completion of the first forging step and beginning of the second heating step; and

    a second forging step comprising rotary forging the heated nickel-base alloy workpiece to a reduction in area of 20% to 70%, wherein the nickel-base alloy workpiece is at a temperature in the range of 1750°

    F. to 1925°

    F. when the second forging step begins;

    wherein the nickel-base alloy workpiece comprises, by weight, up to 0.05% carbon, 27.0% to 31.0% chromium, up to 0.5% copper, 7.0% to 11.0% iron, up to 0.5% manganese, up to 0.015% sulfur, up to 0.5% silicon, at least 58% nickel, and incidental impurities.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×