Method of austempering steel parts

Details Method of austempering steel parts Method of austempering steel parts

2005-01-18

2005-01-18

Yee, Deborah (Department: 1742)

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C148S662000, C148S637000

Reexamination Certificate

active

06843867

ABSTRACT:
A method of austempering of steel parts is described. The steel parts are initially austenitized and subsequently quenched to a start temperature which is higher than the martensite start temperature. Then the steel parts are subjected to a first isothermal holding at the start temperature for a first time period. Subsequently the steel parts are held for a second isothermal time period at a finish temperature which is higher than the start temperature. The method described is particularly well suited for rapid austempering of steel parts, a pure bainitic structure being achievable, and the core hardness of the steel parts obtained being settable via the start temperature, the finish temperature, the duration of the first time period, and the duration of the second time period.

REFERENCES:
patent: 2258566 (1941-10-01), Elmendorf et al.
patent: 5628045 (1997-05-01), Lindner et al.
patent: 0 707 088 (1996-04-01), None
patent: 0 896 068 (1999-02-01), None
E. Zimmerman, “Materials and Materials Testing”, Herman Schroedel Verlag, 1962, pp. 38, 39 74-79.

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