TC4 titanium alloy laser selective melting material additive manufacturing and heat treatment method

Abstract

Disclosed is a TC4 titanium alloy laser selective melting material additive manufacturing and heat treatment method. According to parameters of a TC4 titanium alloy laser selective melting process, laser power ranges from 300 W to 325 W, the spot diameter ranges from 0.12 mm to 0.14 mm, scanning speed ranges from 500 mm / s to 1,200 m / s, and the thickness of a powder laying layer ranges from 0.03 mm to 0.04 mm. A dual annealing process is adopted in heat treatment of a forming component, a TC4 titanium alloy component is firstly put in a vacuum heat treatment furnace with the temperature of 780 DEG C to 820 DEG C, and temperature is reduced to room temperature in an air cooled manner after heat preservation is carried out for 1.5-2 h; and then the TC4 titanium alloy component is put in the vacuum heat treatment furnace with the temperature of 530 DEG C to 550 DEG C again, and temperature is reduced to room temperature in an air cooled manner again after heat preservation is carried out for 2-3 h. The strength of the TC4 titanium alloy component treated through the process exceeds 1,000 MPa, meanwhile, ductility is not smaller than 10%, and the TC4 titanium alloy component can meet the requirements of aerospace products for the strength and plasticity of TC4 titanium alloy key bearing structural components.

Description

technical field [0001] The invention relates to a TC4 titanium alloy laser selective melting additive manufacturing and heat treatment method to obtain a TC4 titanium alloy structural part with excellent mechanical properties. Background technique [0002] TC4 titanium alloy is a medium-strength α+β-type two-phase titanium alloy, containing 5.5% to 6.8% of the α-phase stable element Al and 3.5% to 4.5% of the β-phase stable element V. The alloy has excellent comprehensive properties and is used as an important material in aerospace, and its application in the military industry has been expanding in recent years. [0003] The laser selective melting additive manufacturing technology of TC4 titanium alloy components is to melt TC4 titanium alloy powder layer by layer through high-energy laser beams, and then realize the manufacture of arbitrary complex TC4 titanium alloy components. At the same time, this technology can also overcome the massive waste of TC4 titanium alloy ra...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in order to meet the higher requirements of aerospace products on the strength and plasticity of TC4 titanium alloy components, that is, the TC4 titanium alloy complex components prepared by laser selective melting additive manufacturing technology are subjected to double annealing heat treatment process After treatment, the elongation rate is guaranteed to be not less than 10% under the condition that its strength reaches 1000MPa