METHOD FOR MAKING ARTICLES OF METALS AND ALLOYS HAVING LAMINATE STRUCTURE CAUSED BY CONTRAST CONCENTRATIONS OF ALLOYING ELEMENTS SUCH AS CARBON AND NITROGEN EMBEDDED INTO METAL BY CHEMICAL AND HEAT TREATMENT

FIELD: machine engineering, namely processes of heat strengthening, thermochemical and thermomechanical strengthening. ^ SUBSTANCE: method for making blank of steel articles comprises steps of applying multi-layer coating by thermochemical treatment; at first performing carburization by depth 0.8 mm...

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Bibliographische Detailangaben
Hauptverfasser:	GVOZDEV E.A, SINOPAL'NIKOV O.A, SHAVELKIN A.D, TROSHIN R.N
Format:	Patent
Sprache:	eng ; rus
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 INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	FIELD: machine engineering, namely processes of heat strengthening, thermochemical and thermomechanical strengthening. ^ SUBSTANCE: method for making blank of steel articles comprises steps of applying multi-layer coating by thermochemical treatment; at first performing carburization by depth 0.8 mm; then performing decarbonization by depth 0.15 - 0.2 mm and further cyanidation by depth 0.05 -0.08 mm for making blank having seven layers with concentrations of carbon and nitrogen differed by 0.4% and more. Thermochemical treatment is realized in fluidized bed of catalyst. ^ EFFECT: lowered probability of occurring technological flaws, such as overburning, incomplete fusion, possibility for making laminate articles due to different concentrations of alloying elements. ^ 1 ex