Method for manufacturing titanium alloy additive with laser-induced interface in-situ reaction enhancement

Abstract

The invention discloses a method for manufacturing a titanium alloy additive with laser-induced interface in-situ reaction enhancement. Firstly, atomized titanium alloy powder is poured into a powderfeeder, high-pressure nitrogen passes through the powder feeder and a cold spray gun, and the titanium alloy powder and the high-pressure nitrogen are sprayed to the surface of a titanium alloy matrixthrough the cold spray gun; and during spraying, a laser generator is synchronously started, laser is irradiated on particles of the titanium alloy powder sprayed on the surface of the titanium alloymatrix, the particles of the titanium alloy powder are subjected to micro-melting under the action of laser heating and react with the surrounding high-pressure nitrogen flow, an in-situ reaction occurs, the particles of the titanium alloy powder are mechanically and metallurgically bonded to form a titanium alloy coating on the titanium alloy matrix, thereby producing a highly dense titanium alloy part. According to the method, by means of laser induction, the plastic deformation capability of the powder is improved, so that bonding pores are reduced, a titanium alloy component is strengthened through metallurgical bonding of the in-situ nitridation reaction, and the product quality is improved.

Description

technical field [0001] The invention relates to the field of additive manufacturing of titanium alloys, and more specifically, relates to a method for additive manufacturing of titanium alloys that enhances in-situ reaction at the laser-induced interface. Background technique [0002] Titanium alloy (Ti6Al4V) has become an indispensable key material for aviation, aerospace and other high-tech due to its excellent mechanical, physical and chemical properties such as high specific strength, good corrosion resistance and good biocompatibility. At present, when technologies involving high-temperature melting are used to additively manufacture titanium alloy components, it is often necessary to protect them with an inert atmosphere (such as argon) or a vacuum environment to avoid impurity phases brought about by the high-temperature metallurgical process. Cold spraying technology can avoid thermal adverse effects such as oxidation, phase change, and decomposition caused by high-t...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that poor particle interface bonding in the existing cold spraying titanium alloy technology will lead to high porosity of titanium alloy components and affect the service performance of titanium alloys, and proposes a laser-induced interface in-situ reaction enhancement The titanium alloy additive manufacturing method, by controlling the interaction of laser, gas and powder, makes the powder interface react in situ to form a reinforcement phase such as titanium nitride, forming a metallurgical bond, and overcomes the cold spray additive manufacturing of titanium alloy components. The problem of high porosity caused by a single poor mechanical occlusion reduces the porosity while greatly improving the comprehensive mechanical properties of the titanium alloy coating

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