Cyclic overageing heat treatment for ductility and weldability i

Details Cyclic overageing heat treatment for ductility and weldability i Cyclic overageing heat treatment for ductility and weldability i

1994-08-17

1996-04-23

Simmons, David A.

Metal treatment

Process of modifying or maintaining internal physical...

Producing or treating layered, bonded, welded, or...

148525, 148526, 148527, 148555, 148556, 148675, 148677, 21912114, 21912146, 21912164, C22F 110

Patent

active

055099807

ABSTRACT:
The present invention is directed to a pre-weld overageing heat treatment for nickel-based superalloys, where the alloy is heated to solutionization temperature for a time sufficient to dissolve the gamma prime phase of the alloy microstructure, then slowly cooled with periods of intermittent heating, so that the gamma prime phase reprecipitates as coarse equiaxed particles, and the presence of fine sized gamma prime phase particles is substantially avoided. The present invention is also directed to a welding method wherein said pre-weld overageing treatment is used.

REFERENCES:
patent: 4731131 (1988-03-01), Sakata et al.
patent: 4973366 (1990-11-01), Yasuda et al.
patent: 5302217 (1994-04-01), Gostic et al.
"Practical Solutions to Strain-Age Cracking of Rene 41" by E. G. Thompson et al., pp. 229-313 Jul. 1968 Welding Research Supplement.

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