| 摘要 |
In plasma carburization of the workpiece such as gears, etc., the present invention intends to make the carbon concentration of the carburized layer to be uniform at the edge portion and at the flat portion and also suppress generation of mesh-form carbides along the grain boundary in the edge portion. The workpiece is placed in the vacuum furnace and carburized by feeding carburizing gas into the said vacuum furnace and allowing glow-discharge to take place, and then, continuously, it is decarburized by feeding decarburizing gas such as CO2 gas, etc. It is preferable to repeat carburization and decarburization alternately.
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