STEEL COMPONENT, GEAR COMPONENT, AND METHOD FOR MANUFACTURING STEEL COMPONENT

In this steel component, the concentration of C in a surface layer is 0.85 mass% or more to 1.2 mass% or less, which is higher than the concentration of C in a starting material steel, the surface layer has a volume ratio of a retained-austenite structure higher than 0% and lower than 10%, the remai...

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Bibliographische Detailangaben
Hauptverfasser:	MATSUZAKA, Keisuke, KUBOTA, Manabu, OKADA, Kazuaki, KOYAMA, Tatsuya, MIYANISHI, Kei, SAKAKIBARA, Masashi, OBAYASHI, Koji
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	In this steel component, the concentration of C in a surface layer is 0.85 mass% or more to 1.2 mass% or less, which is higher than the concentration of C in a starting material steel, the surface layer has a volume ratio of a retained-austenite structure higher than 0% and lower than 10%, the remainder of the surface layer is a martensitic structure, the area fraction of grain boundary carbides in the surface layer is lower than 2%, a layer inside the surface layer is higher than the surface layer in a volume ratio of a retained-austenite structure, and in the layer inside the surface layer, the remainder is a martensitic structure.