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    • 4. 发明授权
    • Austenitic aging of metallic compositions
    • 奥氏体老化的金属组成
    • US4067752A
    • 1978-01-10
    • US550556
    • 1975-02-18
    • Greville B. BrookPeter L. BrooksRoger F. Iles
    • Greville B. BrookPeter L. BrooksRoger F. Iles
    • C22F1/08C22C9/01C22C9/04
    • C22F1/08
    • 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.
    • 由于在临界温度范围内被加热或冷却而导致在奥氏体和马氏体状态之间发生可逆转变的一些金属组合物可能会失去从马氏体回复到奥氏体的一部分或全部能力。 通过将组合物转变成马氏体状态,通过将其保持在其存在于奥氏体状态的温度,可以将组合物“老化”来抑制该损失。 显着抑制可逆性损失所需的时间可随着组合物性质的变化而变化。 对于特定的组合物,通常在保持温度升高时缩短所需的时间。