Process method for repairing and strengthening 17-4PH part by laser

• Main Authors: XU ZELIN, SHI WANGXING, MOHAMMED, ZHONG CAI, CHI CHANGTAI
• Format: Patent
• Language: Chinese; English
• Published: 23.04.2021
• Subjects: ALLOYS; CASTING; 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; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; POWDER METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WORKING METALLIC POWDER

The invention discloses a process method for repairing and strengthening a 17-4PH part by laser. The process method comprises the following steps that (1) defects and oil stains on the surface of the 17-4PH part (base material) are removed; (2) (adjusted and optimized) composite laser melting deposition powder is adopted for repairing and strengthening, and a repaired part is obtained; (3) aging heat treatment is performed on the repaired part to further reinforce the performance of a coating; and (4) finish machining is performed. The laser repaired and strengthened 17-4PH part obtained through the process method for repairing and strengthening the 17-4PH part by lasers is high in hardness and excellent in abrasion resistance, the use performance is improved, and the service life is prolonged. Compared with the average hardness 380HV of a 17-4PH homogeneous repair layer, the average hardness of a deposited repair layer using the powder can reach 435HV, and the abrasion resistance is improved by about 20%. 本发