Low temperature hardening of the surface of a ferrous metal work

Details Low temperature hardening of the surface of a ferrous metal work Low temperature hardening of the surface of a ferrous metal work

1983-03-15

1984-07-24

O'Keefe, Veronica

Metal treatment

Compositions

Heat treating

148 16, 148 165, 148 203, C21D 148, C23C 914

Patent

active

044616562

ABSTRACT:
The surface of a ferrous metal workpiece is heat treated by immersing the workpiece to be treated in the fluidized particulate bed of a fluidized bed furnace. The bed is fluidized by a gas atmosphere comprising ammonia gas, hydrocarbon gas, and optionally a non-reactive gas. The temperature of the fluidized bed is maintained at about 600.degree. F. to 1250.degree. F. The proportion of the ammonia gas in the gaseous atmosphere may be varied to alter the surface characteristics of the treated workpiece. The compound layer and the underlying diffusion zone exhibit increased thicknesses. Increased hardness and increased impact loading resistance of the treated surface are obtainable.

REFERENCES:
patent: 1748378 (1930-02-01), Armstrong
patent: 1975064 (1934-09-01), Malcolm
patent: 3096221 (1963-07-01), Tanaka
Japka, Joseph E., Metal Progress, 123, No. 2, pp. 27-33, Feb., 1983.

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