Steam sealing for nitrogen treated ferrous part

Details Steam sealing for nitrogen treated ferrous part Steam sealing for nitrogen treated ferrous part

1986-02-18

1988-04-19

Dean, R.

Metal treatment

Compositions

Heat treating

148 166, 148318, 148319, C21D 174

Patent

active

047387300

ABSTRACT:
A ferrous, sintered, powdered metal part is steam sealed and gas ferritic nitrocarburized to provide a part useful for high hardness applications without the brittleness normally associated with conventional hardening. The steam treating of the ferrous metal part seals off the interconnected porosity of the part with a coating of Fe.sub.2 O.sub.3, but not FeO, to limit the penetration of nitrocarburizing gases so that they produce a surface hardening without contributing to internal brittleness that results from the deeper penetration of the nitrogen treatment.

REFERENCES:
patent: 2074185 (1937-03-01), Langhammer et al.
patent: 2401221 (1946-05-01), Bourne
patent: 2493951 (1950-01-01), Druyvesteyn
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patent: 3194658 (1965-07-01), Storchheim
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patent: 3837848 (1974-09-01), Wessel
patent: 4071382 (1978-01-01), Riopelle
patent: 4168162 (1979-09-01), Shafer
patent: 4255193 (1981-03-01), Slesar et al.
patent: 4501613 (1985-02-01), Matsumoto
Steam Treatment of Pourous Iron, by F. V. Lenel, Ch. 46.

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