Metal treatment – Compositions – Heat treating
Patent
1975-02-28
1976-04-06
Dean, R.
Metal treatment
Compositions
Heat treating
148 115F, 148 32, 148131, C22F 110
Patent
active
039486885
ABSTRACT:
A two-stage process for conditioning an annealed martensitic alloy of titanium and nickel to improve its service life and provide enhanced elongation activity under high operating stress. In the first stage of the process, the alloy is maintained under a tensile stress sufficient to strain it beyond its plastic yield point while it is repeatedly thermally cycled in a primary temperature range between a lower temperature limit below the temperature at which conversion of martensite to austenite commences on heating and an upper temperature limit at least about equal to the temperature at which essentially all the martensite is converted to austenite on heating. In the second stage of the process, the alloy is maintained at a tensile stress sufficient to strain it beyond its plastic yield point while it is repeatedly thermally cycled in a secondary temperature range between a lower temperature limit equal to or higher than the temperature at which conversion of martensite to austenite commences on heating and an upper temperature limit equal to or lower than the temperature at which conversion of austenite to martensite commences on cooling. A novel product having enhanced service life and elongation activity is obtained.
REFERENCES:
patent: 3748197 (1973-07-01), Willson et al.
Baumann Russell E.
Dean R.
Haug John A.
McAndrews James P.
Texas Instruments Incorporated
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