Austenitic aging of metallic compositions

Details Austenitic aging of metallic compositions Austenitic aging of metallic compositions

1975-02-18

1978-01-10

Stallard, W.

Metal treatment

Compositions

Heat treating

751575, 148 115C, 148 32, 148 325, C22C 901, C22C 904, C22F 108

Patent

active

040677524

ABSTRACT:
Some metallic compositions that undergo a reversible transformation between austenitic and martensitic states as a result of being heated or cooled through critical temperature ranges may lose a portion or all of the ability to revert from martensite to austenite. That loss can be inhibited by "aging" the composition prior to its conversion to the martensitic state by holding it at a temperature at which it exists in the austenitic state. The time required to significantly inhibit loss of reversibility may vary as the nature of the composition changes. For a specific composition, the time required typically is shortened as the holding temperature is raised.
The ability of a composition to respond to preconditioning methods by which its A.sub.s temperature can be elevated may also be improved by aging in the austenitic state prior to attempting preconditioning.

REFERENCES:
patent: 3567523 (1971-03-01), Jackson et al.
patent: 3748197 (1973-07-01), Willson et al.
patent: 3783037 (1974-01-01), Brook et al.
patent: 3802930 (1974-04-01), Brook et al.

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