Method of case hardening ferrometallic parts

Details Method of case hardening ferrometallic parts Method of case hardening ferrometallic parts

1991-04-24

1992-03-31

Sheehan, John P.

Metal treatment

Compositions

Heat treating

148 19, C21D 148

Patent

active

051004836

ABSTRACT:
A method of case hardening ferrometallic parts that avoids the use of protective coatings or shields is provided. The process comprises the steps of a) carburizing the entire part, b) machining the carburized part to form first and second surface regions wherein the second surface region has a carbon content at least 100% greater than the carbon content of the first surface region, c) heating the machined part at a hardening temperature with the entire part in contact with a gaseous atmosphere containing a source of carbon and a carbon content of from 85% to 115% of the carbon content of said first surface region, and d) quenching the part.

REFERENCES:
patent: 3398444 (1968-08-01), Nemy
patent: 4154628 (1979-05-01), Dudek et al.
patent: 4173501 (1979-11-01), Hildebrandt et al.
patent: 4629518 (1986-12-01), Larsen
patent: 4711676 (1987-12-01), Kitamori et al.
patent: 4771689 (1988-09-01), Arzoumanian et al.
"Machinery's Encyclopedia", vol. II, E. Oberg and F. D. Jones, The Industrial Press, New York (1917) pp. 2-20.

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