Heat treatment method for eliminating 16Cr3NiWMoVNbE deep cyaniding metallographic black structure

• Main Authors: ZHOU DONGLIN, TONG JIAXING, ZENG XIJUN, WANG HUANMIN, SHI YUYING, CUI XUEWEI, ZHAO YAN, JU DIANWEI, ZHOU KAI, WANG ENSHUANG
• Format: Patent
• Language: Chinese; English
• Published: 28.06.2024
• Subjects: 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

The invention discloses a heat treatment method for eliminating a black structure of a 16Cr3NiWMoVNbE deep cyaniding metallographic phase. The method comprises the steps that S1, a 16Cr3NiWMoVNbE material is cyanided at the temperature of 850-870 DEG C, the carbon potential of a strong carburizing section is 1.10 +/-0.10%, after strong carburizing is finished, the temperature is reduced to 820 +/-20 DEG C along with a furnace, the carbon potential of a cooling section is 0.90 +/-0.10%, and after heat preservation is conducted for 20 +/-10 min, cooling is conducted in a protective atmosphere; s2, carrying out high-temperature tempering treatment on the cyanided material under the condition that the thermal state vacuum degree is not greater than 0.1333 Pa; s3, the material subjected to high-temperature tempering is subjected to quenching treatment; s4, after the material is quenched and recovered to the room temperature, the quenched material is subjected to ice-cooling treatment; and S5, after the material is