Patent ID: 9056372
Filing Date: 2015-06-16
Classification: B23K,B23P,C21D,C22C,C22F,F01D,F05C,F05D,Y10T

Abstract:
1. A method of extending a useable life of a cobalt-based gas turbine component comprising: cleaning the gas turbine component; filling cracks in the gas turbine component with a braze material; heating the component in a protected atmosphere to a first holding temperature range of 800° F.-1000° F. for approximately 30 minutes; heating the component in the protected atmosphere to a second holding temperature range of 1800° F.-2000° F. for approximately 45 minutes, wherein heating the component to the second holding temperature range is preceded directly by a first heat cycle having the first holding temperature range and a ramp up period from the first holding temperature range to the second holding temperature range; dissolving carbides agglomerated on the component to limit the carbides from forming crack initiation sites by heating the component in the protected atmosphere a third holding temperature range of to 2200° F.-2250° F. for approximately 30 minutes to 4 hours, wherein heating the component to the third holding temperature range is preceded directly by a second heat cycle having the second holding temperature range and a ramp up period from the second holding temperature range to the third holding temperature range; reducing heat to the component in the protected atmosphere to a fourth holding temperature range of 2000° F. to 2200° F. for approximately 4 hours to approximately 24 hours, wherein reducing heat to the fourth holding temperature range is preceded directly by a third heat cycle having the third holding temperature range and a ramp down period from the third holding temperature range to the fourth holding temperature range.