The invention relates to a refractory tungsten-tantalum alloy complex structural part and an additive manufacturing forming method. The mass fraction of tungsten in the tungsten-tantalum mixed powder used is 95%, and the mass fraction of tantalum is 5%. The tungsten-tantalum mixed powder adsorb fine tantalum powder particles on the surface of tungsten particles to form a coating of mixed powder raw materials; The tungsten powder particle size is 5 ~ 25μm; The fine tantalum powder is submicron grade; Refractory tungsten-tantalum alloy was fabricated by using tungsten-tantalum powder mixture based on laser powder bed melting additive. The invention can realize in-situ alloying of tungsten-tantalum alloy, and tungsten and tantalum form a complete solid solution with fewer internal defects. At the same time, tungsten tantalum alloy complex structural parts show good formability, its dimensional accuracy of ±0.1mm, to achieve integrated direct manufacturing, to overcome the traditional melting and powder sintering can not directly obtain tungsten tantalum alloy complex structural parts, low density, has broad application prospects.
The invention relates to an additive manufacturing and forming method for complex structural parts of refractory tungsten-tantalum alloy. The mass fraction of tungsten in the tungsten-tantalum mixed powder used is 95%, and the mass fraction of tantalum is 5%. The tungsten-tantalum mixed powder adsorb fine tantalum powder particles on the surface of tungsten particles to form a coating of the mixed powder raw materials; The tungsten powder particle size is 5 ~ 25μm; The fine tantalum powder is submicron grade; Refractory tungsten-tantalum alloy was fabricated by using tungsten-tantalum powder mixture based on laser powder bed melting additive.
The tungsten-tantalum powder was vacuum dried before forming. The drying temperature is 80℃ ~ 120℃, and the drying treatment time is not less than 4 hours. During the forming process, the stainless steel substrate is always preheated, and the stainless steel substrate is pre-treated with sand blasting, and the preheating temperature is 80 ~ 200℃.
The direct preparation of refractory tungsten-tantalum alloy with fewer internal defects can be realized by optimizing the process parameters. Further, under the optimal process parameters and forming conditions, the direct manufacturing of tungsten-tantalum alloy structural parts with special-shaped curved surface can be completed, avoiding or reducing the problems of multi-process, long cycle and limited structural complexity existing in the traditional method of manufacturing tungsten-tantalum structural parts. Combined with laser additive manufacturing, the direct manufacturing of refractory tungsten structural parts can effectively promote the wide application of tungsten materials in various fields.
