METHOD FOR NITRIDING STEEL MEMBER

This method for nitriding a steel member comprises the step of nitriding a steel member in a nitriding gas atmosphere having a nitriding potential at which a [gamma]'-phase or [Epsilon]-phase iron nitride compound layer can be formed on the surface of the steel member, and the passing step of s...

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Bibliographische Detailangaben
Hauptverfasser:	SHIMIZU YUICHIRO, SHIMIZU KATSUSHIGE, AKIMOTO KIYOTAKA
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ALLOYS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	This method for nitriding a steel member comprises the step of nitriding a steel member in a nitriding gas atmosphere having a nitriding potential at which a [gamma]'-phase or [Epsilon]-phase iron nitride compound layer can be formed on the surface of the steel member, and the passing step of subsequently passing the steel member through an atmosphere of 425 DEG C to 600 DEG C in which the iron nitride compound layer does not grow over five minutes or more. The iron nitride compound layer has a [gamma]'-phase outermost layer and the proportion of the [gamma]' phase precipitated in the iron nitride compound layer is 40% or more. 在钢部件的氮化处理方法中，在氮势为能够在钢部件的表面生成γ'相或ε相的氮化铁化合物层的氮化气体气氛中进行钢部件的氮化处理工序，之后，进行使钢部件在425℃～600℃的氮化铁化合物层不生长的气氛中历经5分钟以上而通过的通过工序，使氮化铁化合物层的最表层成为γ'相，并且使氮化铁化合物层的40％以上析出γ'相。