Method for reducing the hardening distortion during case hardeni

Details Method for reducing the hardening distortion during case hardeni Method for reducing the hardening distortion during case hardeni

1982-06-11

1984-09-04

O'Keefe, Veronica

Metal treatment

Compositions

Heat treating

148 3, 148131, 291592, C21D 932

Patent

active

044695306

ABSTRACT:
To reduce the hardening distortion during the case hardening of large toothed rims or gear wheels formed of steel the toothed rim or the like during cooling thereof, starting from the hardening temperature, is shrunk during the .gamma./.alpha. transformation of its core material upon a support body member, and then there is limited, during the further cooling to room temperature, the increase of the stresses in the toothed rim in that the support body member is inserted into the toothed rim in a pre-heated condition. The material of the support body member has a greater coefficient of thermal expansion than that of the toothed rim.

REFERENCES:
patent: 1561041 (1925-11-01), White
patent: 4154628 (1979-05-01), Dudek
patent: 4179313 (1979-12-01), Koch et al.
patent: 4376662 (1983-03-01), Brimm

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