Metal powder material additive manufacturing method under ultrahigh pressure inert gas shielding

Abstract

The invention provides a metal powder material additive manufacturing method under ultrahigh pressure inert gas shielding. A pressurized cabin is designed outside material additive manufacturing forming equipment and communicated with the material additive manufacturing forming equipment, before parts are printed by high-energy laser beams / electron beam layer by layer according to a scanning path, inert gases such as Ar and He are injected into the pressurized cabin, and the high pressure in the pressurized cabin and the material additive manufacturing forming equipment is kept all the time. By means of the material additive manufacturing method under ultrahigh pressure inert atmosphere, high-property metal parts are directly manufactured, and the method is particularly suitable for material additive manufacturing of active easily-oxidized metal such as high temperature alloy and titanium alloy. The method has the following remarkable advantages that (1) the inner qualities of the metal parts are improved; (2) deformation and cracking phenomena during printing are reduced; (3) the compactness of the metal printed parts is improved to a certain degree; (4) invasion of harmful gases is effectively prevented during printing.

Description

technical field [0001] The invention belongs to the field of metal powder additive manufacturing, and in particular relates to an additive manufacturing technology suitable for metal powder, especially superalloy and titanium alloy powder. Background technique [0002] Metal parts such as superalloys and titanium alloys are widely used in high-end fields such as aerospace. If high-temperature alloy and titanium alloy metal parts are processed by the traditional forging + machining (subtractive manufacturing) method, not only heavy forging equipment is required, but also the manufacturing process is numerous and the process is complicated, the machining allowance of the parts is large, and the material utilization rate is low. , High manufacturing cost. [0003] As a rookie in the manufacturing industry, additive manufacturing technology is a revolutionary new manufacturing technology. It uses a layer-by-layer "printing" method to print out the designed or scanned products ...

AI Technical Summary

Problems solved by technology

[0004] Additive manufacturing technology provides a new way for the manufacture of high-temperature alloys and key components of titanium alloys for aerospace. However, there are still problems in additive manufacturing technology such as low internal quality, insufficient density, and poor process stability. The comprehensive mechanical properties of parts It is not as good as forging, the main reason is that the purity of the 3D printing powder material is not high and the combination of the powder is not strong due to factors such as oxidation during the printing process

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