Metal treatment – Compositions – Heat treating
Patent
1986-07-15
1988-05-17
Brody, Christopher W.
Metal treatment
Compositions
Heat treating
148 166, C21D 174
Patent
active
047448393
ABSTRACT:
The process comprises opening the door of the furnace, introducing a charge into the furnace which was previously conditioned at the carburization temperature, closing the door of the furnace, subjecting the charge to a first phase, termed carburization phase, in the course of which the rate of transfer of the carbon of the atmosphere to the surface of the workpiece is preponderant relative to the rate of diffusion of the carbon from the surface of the workpiece to the interior of the workpiece, then to a second phase, termed diffusion phase, in the course of which said rate of diffusion becomes preponderant relative to said rate of transfer, the charge being possibly cooled before the opening of the door of the furnace so as to permit its extraction and the introduction of a new charge, a carrier gas, to which hydrocarbon may be added, being introduced into the furnace throughout the duration of the process. According to the invention, the flow rate D.sub.1 of carrier gas during the carburization phase is related to the flow rate D.sub.2 of carrier gas during the diffusion phase by the relation
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Brody Christopher W.
L'Air Liquide
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