Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1998-06-30
2000-09-19
Yee, Deborah
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148527, 148516, C21D 900
Patent
active
061206245
ABSTRACT:
A preweld heat treatment for precipitation hardenable IN939 nickel base superalloy having a gamma matrix and gamma prime strengthening phase dispersed in the matrix comprises heating the nickel base superalloy at about 2120 degrees F. for a time to solution gamma prime phase followed by slow cooling to below about 1450 degrees F. at a rate of about 1 degree F./minute or less, and cooling to room temperature. The preweld heat treatment eliminates strain age cracking at base metal weld heat-affected zone upon subsequent heat treatment to develop alloy mechanical properties.
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"Effect of Homogenization Heat Treatment on the Microstructure and Heat-Affected Zone Microfissuring in Welded Cast Alloy 718" Metallurgical and Materials Transactions, vol. 27 A, Mar., 1996, Huang et al.
Corrigan John
Launsbach Michael G.
Vogt Russell G.
Howmet Research Corporation
Timmer Edward J.
Yee Deborah
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