Metal treatment – Compositions – Heat treating
Patent
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.
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Steam Treatment of Pourous Iron, by F. V. Lenel, Ch. 46.
Dean R.
Lindberg Corporation
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