Carbon Content Control of Steel Foil in Plasma-carburizing

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  • プラズマ浸炭における鋼箔試料の炭素濃度制御
  • プラズマ シンタン ニ オケル コウハク シリョウ ノ タンソ ノウド セイギ

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The influences of the specimen size, treating time and retained methane content in the plasma-carburizing process on the carbon content and microstructures of specimens were studied. Case hardening steel (S15CK) foils with 0.25 mm thickness and low carbon steel foils with 0.06 mm thickness were used as specimens. When plasma-voltage was held constant, the plasma-current increased proportionally to the specimen surface area. Therefore the current density and carbon content could be kept constant. The time to reach the maximum carbon content decreased as the retained methane content increased. With increasing time in plasma-carburizing, the carbon content decreased slightly and a ferrite layer was formed near the surface. These specimens had definite carbon contents respectively regardless of both retained methane and treating time. The definite carbon content in S15CK was 1.1 mass%, and that in low carbon steel was 0.7 mass%. Since the thickness of the ferrite layer was not practically affected by the specimen thickness, the carbon content became lower in low carbon steel than that in S15CK. The decarburized ferrite layer was only observed in the sooted specimens. The potential gradient in the surface layer increased with the soot deposited, and the electrons emitted from the specimens increased. Hence, decarburization would occur due to the discharging of carbon atoms in the surface layer.

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