Low-carbon alloy steel surface high-hardness modification method

• Main Authors: DONG YU, ZOU YECHENG, WANG ZEMIN, ZUO XIAOSHUN
• Format: Patent
• Language: Chinese; English
• Published: 11.02.2022
• 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; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

The invention belongs to the technical field of low-carbon alloy steel surface treatment, and particularly discloses a low-carbon alloy steel surface high-hardness modification method which comprises the following steps of S1, selecting low-carbon alloy steel which contains alloy elements beneficial to forming a permeation layer and is subjected to normalizing treatment as an engineering machinery transmission part material, and after normalizing, peeling and straightening the low-carbon alloy steel and processing the low-carbon alloy steel into a transmission part, S2, conducting first-stage treatment, specifically, putting the normalized low-carbon alloy steel into a carbonitriding furnace, and increasing the temperature to 900-950 DEG C along with the carbonitriding furnace, S3, keeping for 4-6 hours under the carbon potential of 0.9-1.2%, then keeping for 1-3 hours under the carbon potential of 0.6-0.8%, and carrying out carbonitriding treatment, and S4, conducting second-stage treatment, after the low-ca