Metal treatment – Compositions – Heat treating
Patent
1983-12-12
1984-11-27
Stallard, W.
Metal treatment
Compositions
Heat treating
148 115C, 148 115N, 148402, C21D 178, C22F 108, C22F 110
Patent
active
044849559
ABSTRACT:
A method of treating an integral piece of thermosensitive material which undergoes thermoelastic, martensitic phase transformation in response to heat to pass from a martensitic phase when at a temperature below a phase transformation temperature range and capable of a first high level of recoverable strain to a parent austenitic phase and memory shape when at a temperature above the phase transformation temperature range and capable of a second lower level of recoverable strain. The method is characterized by first cold working the material to a cold worked state comprising a disordered combination of martensitic and austenitic structures and then memory annealing a first portion of the integral piece of material to establish the martensitic and austenitic phases and the memory shape in the austenitic phase while retaining a second portion of the integral piece of material in the cold worked state and incapable of shape memory response. The piece of material is then mounted in a working environment by being supported and restrained in the second cold worked portion while the first annealed portion is free to pass back and forth between the martensitic and austenitic phases to produce useful work in response to heat.
REFERENCES:
patent: 3558369 (1971-01-01), Wang et al.
patent: 3948688 (1976-04-01), Clark
patent: 4149911 (1979-04-01), Clabburn
patent: 4435229 (1984-03-01), Johnson
Milton Jr. Harold W.
Stallard W.
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