Back to results
US 11,131,013 B2Granted
Ni-based alloy, gas turbine material, and method for manufacturing Ni-based alloy
AssigneeJapan Steel Works M&E, Inc.
InventorsTakuya Okawa, Koichi Takasawa, Eiji Maeda, Masato Yoshida
Life of this patent
Estimating the term…
Abstract
The purpose of the present invention is to enhance the creep characteristics of an Ni-based alloy. The present invention relates to a Ni-based alloy characterized by having a composition containing, in terms of wt %, 15.00-25.00% Cr, 5.00-15.00% Co, 1.00% to less than 12.00% Mo, 1.50-2.50% Ti, 1.00-2.00% Al, 0.20-1.00% Nb, and 0.0010-0.10% C, and in terms of mass ppm, 10-200 ppm P, 30-250 ppm B, and 30-200 ppm N, the remainder comprising Ni and unavoidable impurities.
Claims9
A Ni-based alloy having a composition consisting of:
- in terms of % by mass,
- Cr:
- 15.00 to 25.00%;
- Co:
- 8.00 to 15.00%;
- Mo:
- 1.00% or more and less than 12.00%;
- Ti:
- 1.50 to 2.50%;
- Al:
- 1.00 to 2.00%;
- Nb:
- 0.20 to 1.00%;
- and
- C:
- 0.0010 to 0.10%;
- and
- in terms of ppm by mass,
- P:
- 10 to 200 ppm;
- B:
- 30 to 250 ppm;
- and
- N:
- 30 to 200 ppm,
- with the balance being Ni and unavoidable impurities,
- wherein the grain boundary coverage defined by the ratio of the length of grain boundaries covered with carbides to the length of grain boundaries in the alloy is 85% or more.
24 more elements
A method for manufacturing a Ni-based alloy, comprising:
- subjecting a Ni-based alloy to a solution treatment, the Ni-based alloy having a composition consisting of, in terms of % by mass, Cr:
- 15.00 to 25.00%, Co:
- 8.00 to 15.00%, Mo:
- 1.00% or more and less than 12.00%, Ti:
- 1.50 to 2.50%, Al:
- 1.00 to 2.00%, Nb:
- 0.20 to 1.00%, and C:
- 0.0010 to 0.10% and, in terms of ppm by mass, P:
- 10 to 200 ppm, B:
- 30 to 250 ppm, and N:
- 30 to 200 ppm, with the remainder being Ni and unavoidable impurities;
- and
- subsequently subjecting the Ni-based alloy to a first aging treatment at a temperature of 1010 to 1050° C. and then a second aging treatment at a temperature of 760 to 790° C.,
- wherein the grain boundary coverage defined by the ratio of the length of grain boundaries covered with carbides to the length of grain boundaries in the alloy is 85% or more.
11 more elements
Dependencies are inferred from the claim text.