A method for ultrasonic-assisted laser additive manufacturing of two-dimensional titanium-based functionally graded materials

Abstract

The invention discloses a method for ultrasonic-assisted laser additive manufacturing of two-dimensional titanium-based functionally graded materials, which belongs to the technical field of laser additive manufacturing. The two-dimensional titanium-based functionally graded material has a one-dimensional gradient transition in the XY and YZ planes, and a two-dimensional gradient transition in space. The preset gradient transition form of each deposition layer is a "7"-shaped transition from the a area in the lower left corner to the k area in the upper right corner to ensure the ultrasonic at the bottom, the flow and solidification process of the molten pool when a high proportion of ceramic particles is added adequate intervention. In the different gradient areas in the XY plane and YZ plane, the optimized direct laser deposition process parameters and ultrasonic action parameters are used to reduce the heat accumulation, the size and content of unmelted ceramic particles, and the size of the coarse dendritic primary phase to improve the titanium-based function. The overall performance of the gradient material. The laser head scans according to the "7"-shaped path, which reduces the number of gradient bonding interfaces between adjacent tracks and between tracks, and is conducive to improving the overall performance of titanium-based functionally graded materials. The invention can promote the uniform distribution of ceramic particles, fragment coarse dendrites, and refine microstructures, so as to improve the overall performance of the two-dimensional titanium-based functional gradient material.

Description

technical field [0001] The invention belongs to the technical field of laser additive manufacturing, and is mainly aimed at the field of coaxial powder-feeding laser additive manufacturing of functionally graded materials, and in particular relates to a method for ultrasonically assisted laser additively manufacturing two-dimensional titanium-based functionally graded materials. Background technique [0002] Titanium alloys have excellent specific strength, corrosion resistance and other properties, and are widely used in aerospace, automotive, energy, marine and other fields. However, titanium alloys have low hardness, poor wear resistance, and low thermal conductivity, which limit the application of titanium alloys in high-precision fields. In addition, with the rapid development of the aerospace field, the functions of components need to be diversified to adapt to complex working environments. Therefore, ceramic particle-reinforced titanium-based composites and ceramic p...

AI Technical Summary

Problems solved by technology

Metal-ceramic functionally graded materials are directly formed by laser, and there are likely to be problems such as uneven distribution of ceramic particles and coarse primary dendritic reinforcement in the microstructure.

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