Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1993-06-03
1995-05-23
Andrews, Melvyn J.
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148555, C21D 126
Patent
active
054177820
ABSTRACT:
A nickel-based superalloy known by the designation "718" and having a typical composition comprising, in percentages by weight, Cr 19, Fe 18, Nb 5, and the remainder Ni, is subjected, after the usual thermo-mechanical and heat treatment steps, to an additional annealing step wherein the temperature and duration are selected from the following range as desired:
800.degree. C. for between 5 and 30 hours;
750.degree. C. for between 25 and 70 hours; and
700.degree. C. for between 100 and 300 hours.
This leads to a definite improvement in the behaviour of parts made from the superalloy, in terms of fatigue cracking, when used at temperatures over 650.degree. C.
REFERENCES:
patent: 2570194 (1951-10-01), Bieber et al.
patent: 2977223 (1961-03-01), Brown
patent: 4676846 (1987-06-01), Harf
patent: 4750944 (1988-06-01), Snyder et al.
E. F. Bradley, "Superalloys a Technical Guide," 1988, ASM International, Metals Park, Ohio, US, pp. 47 & 48.
Welding Journal. Including: Welding Research Supplement, vol. 65, No. 11, Nov. 1986, Miami, US, pp. 299s-304s, R. G. Thompson, et al., "Effect of heat Treatment on Microfissuring in Alloy 718".
Andrews Melvyn J.
Phipps Margery S.
Societe Nationale d'Etude et de Construction de Moteurs d'Aviati
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