Heat treatment method for improving strength and plasticity of laser melting deposition double-phase titanium alloy

• Main Authors: ZHOU GUANNAN, WANG JIAN, CHAI DONGSHENG, XUE LIYUAN, DONG WENCHAO
• Format: Patent
• Language: Chinese; English
• Published: 24.02.2023
• Subjects: ADDITIVE MANUFACTURING TECHNOLOGY; ADDITIVE MANUFACTURING, i.e. MANUFACTURING OFTHREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVEAGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING,STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING; CASTING; CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WORKING METALLIC POWDER

The invention discloses a heat treatment method for improving the strength and plasticity of a laser melting deposition double-phase titanium alloy, which is characterized in that a three-stage heat treatment process of high-temperature solid solution, high-temperature aging and stress relief annealing is carried out on a deposited structure of the laser melting deposition double-phase titanium alloy, and compared with a traditional heat treatment method, the heat treatment method has the advantages that the plasticity is not improved at the cost of sacrificing the strength; and the strength and plasticity are simultaneously improved. A microstructure obtained after heat treatment is composed of a discontinuous grain boundary alpha phase, a primary alpha phase and a secondary alpha phase distributed in a dispersed mode, and the orientation of the secondary alpha phase is diversified. The discontinuous grain boundary alpha phase and the dispersively distributed secondary alpha phase enable the strength and the