Method for making a hydrogen embrittlement resistant .gamma.' st

Details Method for making a hydrogen embrittlement resistant .gamma.' st Method for making a hydrogen embrittlement resistant .gamma.' st

1996-12-04

1999-11-02

Phipps, Margery

Metal treatment

Process of modifying or maintaining internal physical...

With casting or solidifying from melt

148562, 148675, C22F 110

Patent

active

059762802

ABSTRACT:
A nickel base superalloy, having either columnar or equiaxed grain structure, which has significantly improved resistance to hydrogen embrittlement, and to fatigue in air. The material is processed so as to be essentially free of script type carbides, .gamma./.gamma.' eutectic islands and porosity. The processing includes heat treating above the .gamma.' solvus temperature to solution the script type carbides and eutectic islands, followed by HIP to eliminate the porosity.

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