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

A technology of laser processing and internal powder feeding, which is applied in laser welding equipment, metal processing equipment, additive processing, etc., can solve the problems of uneven oxidation degree of formed parts, performance degradation of formed parts, uneven tissue distribution, etc., and achieve high performance Stability, uniform oxidation degree, avoiding the effect of local overheating

Active Publication Date: 2020-08-18
苏州天至尊科技有限公司
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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.

Method used

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

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Embodiment

[0038]In an open environment, the laser processing nozzle with internal powder feeding is used to carry out continuous additive forming of titanium alloy with 8 horizontal channels and 90 vertical layers. The initial laser power is 1050W, and the protective gas flow rate of 30L / min is used to obtain 13.52 mm inert gas shielding length. According to the monitoring results of the infrared thermal imager, the length of the high-temperature and easy-to-oxidize region exceeds the length of the inert gas protection when the number of stacked layers is 30, 46, 67, and 85. Therefore, the laser power is reduced to 950W at the 30th layer, 920W at the 46th layer, 890W at the 67th layer, and 850W at the 85th layer, and finally a titanium alloy with a size of length × width × height = 50mm × 12mm × 40mm is obtained. pieces. Each surface of the formed part is bright silvery white.

[0039] The powder composition of the titanium alloy is shown in Table 1.

[0040] Table 1 Titanium alloy p...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/34B33Y10/00
CPCB23K26/34B33Y10/00B23K2103/14
Inventor 石拓李刚金朝龙傅戈雁张津超
Owner 苏州天至尊科技有限公司
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