METHOD FOR NITRIDING METAL MOLD AND METHOD FOR EVALUATING NITRIDED METAL MOLD

PROBLEM TO BE SOLVED: To provide a method for nitriding an alloy tool steel for a metal mold and to provide a method for evaluating the nitrided metal mold. SOLUTION: The method for nitriding a metal mold comprises selecting the ratio between gases used in nitriding, a salt bath compositional ratio,...

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1. Verfasser:	YOKOI DAIEN
Format:	Patent
Sprache:	eng
Schlagworte:	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 GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MEASURING METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PHYSICS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TESTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for nitriding an alloy tool steel for a metal mold and to provide a method for evaluating the nitrided metal mold. SOLUTION: The method for nitriding a metal mold comprises selecting the ratio between gases used in nitriding, a salt bath compositional ratio, a treatment temperature, or a treatment time so as to satisfy the condition that, in a metal mold formed by nitriding an alloy tool steel, the difference δ2θ between the angles of diffraction and/or between the difference δW of the half-width values from the (200) faces and/or the (211) faces of α-phases in the area surface-nitrided and the area not surface-nitrided is 0.3° or larger and/or 0.3° or larger. In one embodiment of the above method, the difference δ2θ between the angles of diffraction from the α phases is 0.6° or larger and/or the difference δW between the half-widths is 0.5° or larger. The method for evaluating the nitrided metal mold is also provided. COPYRIGHT: (C)2006,JPO&NCIPI