Borocarburizing ferrous substrates

Details Borocarburizing ferrous substrates Borocarburizing ferrous substrates

1983-10-31

1985-01-22

O'Keefe, Veronica

Metal treatment

Compositions

Heat treating

148 31, 148 155, 148 6, C21D 922, C23C 900

Patent

active

044950063

ABSTRACT:
A process is disclosed for case hardening of ferrous metal. In the process of the invention, the surface of the ferrous metal is exposed to diffusible carbon and boron in a furnace during multiple stages of a single thermal cycle without intermediate cooling. The furnace is maintained at a first temperature which enhances diffusion of the carbon to create a carburized substrate to a desired depth. The furnace temperature is then elevated to a second temperature to enhance diffusion of the boron to form an outer surface layer enriched therewith. This results in a gradual transition between the carburized substrate and the boronized layer.

REFERENCES:
patent: 3842921 (1974-10-01), Dill et al.
patent: 3922038 (1975-11-01), Scales
patent: 3923348 (1975-12-01), Peck
patent: 4012238 (1977-03-01), Scales
patent: 4102838 (1978-07-01), Scales
patent: 4188242 (1980-02-01), Scales
patent: 4237184 (1980-12-01), Gonseth et al.

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