Iron@ castings with spheroidal graphite for car differential gear unit production

The iron casting with spheroidal graphite has a sliding wear zone which is in contact with a corresponding material containing at least silicon, manganese and carbon. The casting incorporates a structure chosen from a group consisting of tempered martensite, tempered martensite and troostite, and te...

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Bibliographische Detailangaben
Hauptverfasser:	YAMAZAKI, KAZUYUKI, TOCHIGI, JP, KAMIBAYASHI, HIROKAZU, TOCHIGI, JP, ISHIKAWA, YASUHIKO, TOCHIGI, JP
Format:	Patent
Sprache:	eng ; ger
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:	The iron casting with spheroidal graphite has a sliding wear zone which is in contact with a corresponding material containing at least silicon, manganese and carbon. The casting incorporates a structure chosen from a group consisting of tempered martensite, tempered martensite and troostite, and tempered martensite and sorbite. Additionally, it incorporates a layer consisting of a solid solution with diffused nitrogen. Also claimed are a method for heat treatment of such a casting, and a resultant differential gear unit for motor-cars. The casting has a surface layer consisting of a carburising and nitriding compound. This layer has been produced on top of a solid solution layer with diffused nitrogen. Alternatively, an extremely thin surface layer is produced out of an oxidised compound on top of a solid solution layer with diffused nitrogen. The solid solution layer with diffused nitrogen has a thickness of 20-400 mu m and a Vickers hardness of 580-650. The surface layer consisting of a carburising and nitriding compound has a thickness of 5-30 mu m.