20CrMnMo energy-saving carburizing composite heat treating process

The invention discloses a 20CrMnMo energy-saving carburetion composite heat treatment process including the following steps: (1) appropriate processing parameters are chosen to carry out the carburetion according to workpiece technique; (2) the workpiece is slowly cooled along with a furnace, little...

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Bibliographische Detailangaben
Hauptverfasser:	SHEN JIEGUO, HU YUEDI
Format:	Patent
Sprache:	chi ; 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 MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25 NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	The invention discloses a 20CrMnMo energy-saving carburetion composite heat treatment process including the following steps: (1) appropriate processing parameters are chosen to carry out the carburetion according to workpiece technique; (2) the workpiece is slowly cooled along with a furnace, little reticula cementite are gradually separated out on the surface of a carburized layer and cooled to 600-650 DEG C for holding in the surface for a period, the workpiece is recrystallized from austenite to pearlite, at the same time the carbide on the surface of the carburized layer undergoes spheroidisation; (3) the temperature is increased to 820-840 DEG C for holding, discharging and quenching are carried out to change austenite into martensite; (4) tempering treatment is carried out. The process greatly shortens the processing time, improves the production efficiency, and enhances the hardness, the abrasion resistance and the fatigue strength of the workpiece.