Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1973-12-21
1976-04-27
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
148 115R, 148 115F, 148 32, C22F 110
Patent
active
039532534
ABSTRACT:
A process for increasing the tensile strength of a martensitic alloy of titanium and nickel and for improving the alloy's ability to retain its original properties during use by stabilizing it against progressive elongation when cycled through successive martensitic transformations. The process comprises maintaining the alloy under a tensile stress of between about 30,000 and 100,000 psi while annealing the alloy at a temperature above a first diffusional phase transformation temperature. The first diffusional phase temperature is the first temperature above the martensitic transformation range at which there is a negative slope in the electrical resistivity versus temperature curve for the alloy. The product of this process has a tensile strength of at least about 175,000 psi and a martensitic elongation activity under stress of at least about 2% and will survive over one million martensitic transformation cycles when placed under sufficient stress that the elongation activity is about 2%.
REFERENCES:
patent: 3351463 (1967-11-01), Rozner et al.
patent: 3748197 (1973-07-01), Willson et al.
patent: 3753792 (1973-08-01), Tyler
Baumann Russell E.
Dean R.
Haug John A.
McAndrews James P.
Texas Instruments Incorporated
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