Tungsten high temperature resistance, excellent radiation shielding performance, widely used in national defense, nuclear chemical industry, medical equipment and so on. However, its cracking ductility at room temperature is poor and it is difficult to be widely applied. On the basis of adding tantalum to improve the ductility of tungsten, the application can be improved. The traditional powder metallurgy, arc melting reduction molding is difficult to break through the thin-wall panel production process, because tantalum tungsten alloy is a refractory material, with high melting point, high temperature strength and high hardness and other characteristics, it is easy to crack in the traditional production process or subsequent machining process. Therefore, it is an important direction for researchers to study and develop the forming process of high energy beam additive manufacturing of refractory alloy thin-wall parts.
A tantalum tungsten alloy for 3D printing is characterized by a mass percentage containing tantalum of 10% to 15% and a mass percentage containing tungsten of 85% to 90%.
The particle size distribution of the Ta powder is D90 = 45μm, the vibration density is greater than 10.5, the hall flow rate is not more than 6s, the purity is not less than 99.98%, and the oxygen content is less than 300ppm.
The particle size distribution of the W powder is D90 = 30μm, the purity is 99.95%, the loose density is greater than 10, the vibration density is greater than 12, the hall flow rate is not more than 6s, the purity is not less than 99.98%, and the oxygen content is less than 100ppm.
3D printed tantalum tungsten alloy and preparation of tantalum tungsten alloy thin wall panel, 3D printed tantalum tungsten alloy is composed of tantalum and tungsten; Among them, the mass percentage range of tantalum is 10% to 15%, and the mass percentage range of tungsten is 85% to 90%. A uniform spherical powder was obtained by solid-solid mixing. The mixed ball milling powder was melted by laser selective melting to obtain tantalum tungsten alloy thin-walled parts. The tantalum tungsten alloy prepared by the invention has good density, strong toughness, excellent anti-cracking performance, and overcomes the problem that traditional melting and sintering can not control the forming process of tantalum tungsten alloy thin wall panel, so it has broad application prospect and popularization value.
The invention is based on the existing ball milling process, the core prealloy powder is obtained by using the ball milling process, and the tantalum tungsten alloy with high supercooling and small melting pool is superimposed by SLM laser selective melting forming to obtain the ideal microstructure distribution, and then the tantalum tungsten thin-wall product without cracks at room temperature is obtained by the slow temperature cooling and controlled heat treatment. Under the guarantee of a series of technological measures, the non-cracking thin-walled parts are obtained, which have good fracture toughness at room temperature.
