Titanium alloy additive manufacturing method based on inside-laser powder feeding laser processing nozzle

Abstract

The invention provides a titanium alloy additive manufacturing method based on an inside-laser powder feeding laser processing nozzle, and belongs to the technical field of titanium alloy manufacturing. The method is characterized in that it is guaranteed that L < t > is smaller than or equal to L < q > in the additive manufacturing process, wherein the L < q > is the distance from a powder centerto the outermost side of protective gas, and the L < t > is the maximum distance from the powder center to the position, where the temperature is 400 DEG C, of a formed part in the additive manufacturing process. According to the method, it is guaranteed that the L < t > is smaller than or equal to the L < q >in the additive manufacturing process through a closed-loop control means, which means that it is guaranteed that the protective gas can fully cover the high-temperature area of the formed part in the additive manufacturing process, the situation that the local temperature is too high and uncontrollable due to heat accumulation in the additive manufacturing process is avoided, and it is guaranteed that a final titanium alloy is uniform in components and stable in performance; and according to the data of the embodiment, the surface of the titanium alloy formed part obtained through the embodiment is bright silvery white, and when the stacked height reaches 40 mm, no obvious oxidation discoloration exists; and meanwhile, the content of oxygen elements in all parts of the interior of the formed part is lower than 1,000 ppm.

Description

technical field [0001] The invention relates to the technical field of titanium alloy preparation, in particular to a method for additively preparing titanium alloy based on internal optical powder feeding and laser processing nozzles. Background technique [0002] Titanium alloy has good high and low temperature performance, excellent corrosion resistance, high specific strength and other excellent characteristics, and has been widely used in aerospace, medical and other fields, but the traditional casting, forging, rolling and other methods have low material utilization rate during processing and processing difficulties. The use of additive manufacturing to form titanium alloy parts can greatly improve the utilization rate of materials. However, due to the high chemical activity of titanium alloys, it is easy to oxidize with oxygen in the air, resulting in a sharp decline in the performance of formed parts. At present, the additive manufacturing of titanium alloys is main...

AI Technical Summary

Problems solved by technology

[0004] However, there is a serious problem of heat accumulation in the above-mentioned titanium alloy laser additive manufacturing process, which leads to different degrees of oxidation of the formed parts and uneven distribution of the structure, resulting in a decline in the performance of the formed part.

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