Metal treatment – Compositions – Heat treating
Patent
1985-10-07
1988-04-26
Rutledge, L. Dewayne
Metal treatment
Compositions
Heat treating
148402, C22F 110
Patent
active
047402539
ABSTRACT:
There is disclosed a method of preassembling a composite coupling. The coupling has at least one heat-recoverable driver member and at least one metallic insert. The driver member is made from a nickel/titanium-based shape memory alloy having a transformation hysteresis defined by M.sub.s, M.sub.f, A.sub.s and A.sub.f temperatures. The method includes the steps of overdeforming the driver member by applying a stress sufficient to cause nonrecoverable strain in the driver member so that the A.sub.s and A.sub.f temperatures are temporarily raised to A.sub.s' and A.sub.f', respectively; removing the stress; engaging the driver member and insert; and then warming the driver and insert to a temperature less than A.sub.s'. There is also disclosed a composite coupling processed by this method.
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Duerig Tom
Melton Keith
Simpson John A.
Burkard Herbert G.
Kastler S.
Raychem Corporation
Rutledge L. Dewayne
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