Metal treatment – Compositions – Heat treating
Patent
1987-12-24
1989-04-11
Dean, R.
Metal treatment
Compositions
Heat treating
148162, 148410, C22F 110
Patent
active
048203564
ABSTRACT:
Heat treatments are described for improving the fatigue properties of superalloy articles, without adversely affecting other mechanical properties. The entire heat treatment process is performed below the gamma prime solvus temperature so that significant grain growth does not occur. The heat treatment cycle causes the formation of gamma prime particles in a controlled manner and morphology, first at the grain boundaries and then within the grains. The resultant microstructure possesses the benefits of a fine grain structure (improved resistance to fatigue crack initiation) and fine gamma prime particle size (improved resistance to crack growth).
REFERENCES:
patent: 4608094 (1986-08-01), Miller et al.
Blackburn Martin J.
Caless Robert H.
D'Orvilliers Anne L.
Paulonis Daniel F.
Dean R.
Sohl Charles E.
United Technologies Corporation
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