Weld repair of superalloy materials

Details Weld repair of superalloy materials Weld repair of superalloy materials

2006-08-01

2010-02-02

Bryant, David P (Department: 3726)

Metal working

Method of mechanical manufacture

Impeller making

C029S402040, C029S402090, C029S402160, C148S525000, C148S527000, C148S565000, C148S675000, C228S119000

Reexamination Certificate

active

07653995

ABSTRACT:
A method of weld repairing a superalloy material at ambient temperature without causing cracking of the base material. A superalloy material such as CM-247 LC, as is commonly used in gas turbine blade applications, is subjected to an overage pre-weld heat treatment in order to grow the volume percentage of gamma prime precipitate in the material to a level sufficient to permit ambient temperature welding without cracking. CM-247 LC material is heated in a vacuum furnace at a rate of about 0.5° C. per minute to an intermediate temperature of about 885° C. The material is then gas fan quenched to a temperature of about 52° C. to grow the gamma prime precipitate percentage to about 55%. A fusion repair weld may then be performed on the material at an ambient temperature using a filler material having a chemistry matching a chemistry of the base material.

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