Metal treatment – Compositions – Heat treating
Patent
1985-07-17
1986-04-01
Stallard, Wayland
Metal treatment
Compositions
Heat treating
C22F 108
Patent
active
045796033
ABSTRACT:
This invention provides a novel method for production of formed parts from copper beryllium alloys. More specifically, this invention provides a process for the virtual elimination of the non-reproducible distortion which is currently experienced during the precipitation hardening of parts formed from copper beryllium alloys. To this end the process comprises a series of mechanical and thermal treatments which minimize or eliminate non-reproducible distortion by relieving or decreasing the magnitude of residual stresses throughout the various steps of the process before the formation of precipitates becomes dominant and by providing a more even patterned distribution of precipitates in the matrix of the alloy both prior to and after a thermal aging process. Additionally, the implementation of this process in conjunction with a precipitation hardening treatment utilizing a molten salt bath heating medium results in an alloy which exhibits an increased elongation in tandem with an increased proportional limit.
REFERENCES:
patent: 3573110 (1971-03-01), Ence
patent: 4533412 (1985-08-01), Rotem
patent: 4537242 (1985-08-01), Pryor et al.
patent: 4541875 (1985-09-01), Woodard et al.
Ebert Lynn J.
Woodard Dudley H.
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