TC21 titanium alloy powder for laser 3D printing and preparation and using methods

Abstract

The invention provides TC21 titanium alloy powder for laser 3D printing and preparation and using methods. The powder is prepared from, by mass, 5.5%-6.7% of Al, 1.7%-2.4% of Sn, 1.7%-2.4% of Zr, 2.4%-3.1% of Mo, 1.0%-1.8% of Cr, 1.8%-2.2% of Nb, 0.004%-0.18% of Fe, 0.004%-0.01% of C, 0.002%-0.009% of N, 0.003%-0.01% of H, 0.08%-0.1% of O and the balance Ti. The preparation method comprises the steps that TC21 titanium alloy is machined into an electrode and then rotates and goes down in a smelting chamber, gas acts on the conical tip of a titanium bar when the tip of the titanium bar is bright white, titanium alloy liquid drops are brought into an atomizing chamber through nozzles to be cooled into alloy powder, and the alloy powder is collected. The using method comprises the steps that after the alloy powder with the particle size ranging from 54 micrometers to 180 micrometers and a substrate are pretreated, the as-deposited TC21 titanium alloy with the good strength and toughness is printed by adopting a laser 3D printer, wherein the tensile strength is 1,100-1,150 Mpa, the yield strength is 1,010-1,030 Mpa, and the elongation rate is 7%-8%.

Description

technical field [0001] The invention belongs to the technical field of high-activity metal powder preparation for laser 3D printing, and in particular relates to a spherical TC21 titanium alloy powder for laser 3D printing and its preparation and use method. [0002] technical background [0003] Titanium and titanium alloys have excellent properties such as low density, high specific strength, and good corrosion resistance, and are widely used in aerospace and other fields. In the past few decades, the alloying theory, comprehensive strengthening and toughening technology and heat treatment process of titanium alloys for aviation have been greatly developed. With the advancement of science and technology and the performance requirements of aircraft, advanced titanium alloy materials are gradually developing towards damage-tolerant titanium alloys with high fracture toughness and low crack growth rate. Foreign developed countries have successfully applied medium-strength Ti-...

AI Technical Summary

Problems solved by technology

In addition to the difficulty of hot forming, difficult machining and high cost of titanium alloy itself, TC21 has high strength and increases the difficulty of forming

When traditional methods such as precision casting, precision plastic forming, and powder metallurgy are used to form TC21, there are characteristics such as long cycle time, high equipment requirements, and poor flexibility.

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