Patent ID: 7553384

Claim:
A method for locally heat treating a gas turbine engine superalloy article to improve resistance to strain-induced fatigue of the article comprising: providing a gas turbine engine superalloy article having a gamma prime solvus temperature, wherein the superalloy article has a nominal composition in weight percent of 20.5Co, 11Cr, 3.7Mo, 2.0 W, 3.4Al, 3.6Ti, 0.9 Nb, 2.4 Ta, 0.05Zr, 0.04C, 0.03 B, balance Ni or a nominal composition in weight percent of 8Co, 14Cr, 3.5Mo, 3.5W, 3.5Al, 2.5Ti, 3.5 Nb, 0.15C, 0.01B, balance Ni or a nominal composition in weight percent of 20Co, 11Cr, 3.7Mo, 2.0 W, 3.4Al, 3.6Ti, 0.9 Nb, 2.1 Ta, 0.05Zr, 0.04C, 0.03 B, balance Ni; and locally over aging in a local over age cycle only a selected portion of the article as opposed to the entire article to locally improve fatigue resistance at the selected portion of the article, wherein the local over age cycle includes heating at about 843° C. for about 3 to 4 hours.