NITRIDED COMPONENT AND METHOD FOR PRODUCING THE SAME

PROBLEM TO BE SOLVED: To provide a nitrided component capable of being improved in fatigue characteristics without applying an expensive shot peening, and a method for producing the same.SOLUTION: The nitrided component includes a surface hardened layer including a decarburized layer and a nitrided...

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Hauptverfasser:	ITO YUKIO, KOZUKA TAKUMI
Format:	Patent
Sprache:	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:	PROBLEM TO BE SOLVED: To provide a nitrided component capable of being improved in fatigue characteristics without applying an expensive shot peening, and a method for producing the same.SOLUTION: The nitrided component includes a surface hardened layer including a decarburized layer and a nitrided layer. Chemical composition inside the nitrided component includes, by mass%, C: 0.15% or more and less than 0.5%; one or more elements selected from a group of Cr: 6.0% or less, V: 2.5% or less, Mo: 3.0% or less, and Al: 1.5% or less; N: 0.03% or less. A nitriding factor N1 expressed by (0.08×[%Cr]+0.29×[%V]+0.15×[%Mo]+0.65×[%Al])/[%C] is 1.0 or more. At the surface hardened layer, a decarburization rate expressed by (C-C)/C is 0.30 or more, wherein Cdenotes carbon concentration of the surface, and a surface nitrogen concentration factor Ns expressed by N2/(C-C+0.2) is 1.0 or more, wherein N2 denotes nitrogen concentration of the surface.