Preparation method of high melting point high entropy alloy spherical powder based on laser additive manufacturing

Abstract

The invention discloses a preparation method of high-melting-point high-entropy alloy spherical powder based on laser additive manufacturing. Five or five kinds of high-melting point metal elemental powders are randomly selected from tungsten, titanium, zirconium, hafnium, vanadium, niobium, tantalum and molybdenum. more than one species and mixed according to a certain ratio; then use a high-energy ball mill for mechanical alloying to obtain a single-phase solid solution powder of a high-melting-point high-entropy alloy; use a hot isostatic pressing process to form a standard powder-making bar; finally use an electrode induction to melt the gas mist The laser direct forming powder is prepared by chemical process; the high melting point high entropy alloy single-phase solid solution powder formed by the present invention can solve the problem of different burning loss rates of different elements caused by the large difference in melting point in the process of laser additive manufacturing of high melting point metal single substance powder And a series of problems such as composition microsegregation and negative eutectic caused by multiple elements can more effectively realize the rapid and precise manufacturing of high-temperature and wear-resistant aerospace special parts and high-performance turbine engine hot-end parts.

Description

【Technical field】 [0001] The invention relates to the technical field of high-entropy alloys, in particular to a method for preparing spherical powders of high-melting-point high-entropy alloys based on laser additive manufacturing. 【Background technique】 [0002] Multi-principal high-entropy alloys have multiple effects of high entropy, lattice distortion and hysteresis diffusion. The organizational structure is simple solid solution structure and nanostructure, even amorphous structure, so it has high strength, good wear resistance, high Excellent properties such as work hardening, high temperature softening resistance, high temperature oxidation resistance, corrosion resistance and high electrical resistivity or a combination of these excellent properties are unmatched by traditional multi-element alloys; the constituent phases of high melting point high entropy alloys are body-centered cubic Mainly, the alloys of this system tend to have higher strength, and high-entropy...

AI Technical Summary

Problems solved by technology

[0005] The existing method of laser additive manufacturing to prepare high-melting-point high-entropy alloys mostly adopts the powder ratio of different elements and mixes them evenly with an ordinary ball mill, which is directly used in laser additive manufacturing. This method does not fully consider the burning rate of different elements. Different, the dilution of the matrix and the different proportions of powders of different elements falling into the molten pool during the laser cladding process and other problems of uneven composition content during forming; and this method will inevitably cause The composition microsegregation and negative eutectic will affect the overall performance of the formed parts. Therefore, it is very difficult to directly apply the high melting point metal elemental powder to laser additive manufacturing.

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