Method for ultrasonic auxiliary laser additive manufacturing of two-dimension titanium-based functional gradient material

Abstract

The invention discloses a method for ultrasonic auxiliary laser additive manufacturing of a two-dimension titanium-based functional gradient material, and belongs to the technical field of laser additive manufacturing. The two-dimension titanium-based functional gradient material is in one-dimension gradient transition in the XY and YZ plane and is in two-dimension gradient transition in space. According to the preset each-deposition-layer gradient transition form, the area a at the lower left corner is in 7-shaped transition to the area k at the upper right corner, accordingly, bottom ultrasonic is ensured, and sufficient interference is conducted on the molten bath flowing and solidifying process during high-proportion ceramic particle adding. In different gradient areas in the XY and YZplane, optimized direct laser deposition technological parameters and ultrasonic acting parameters are adopted, heat accumulation, the size and content of non-melted ceramic particles and the size ofa thick branch-shaped primary phase are reduced, and accordingly the integral performance of the titanium-based functional gradient material is improved. A laser head conducts scanning according to the 7-shaped path, the number of gradient combined interfaces between adjacent ways is reduced, and the integral performance of the titanium-based functional gradient material can be better improved. By means of the method, uniform distribution of the ceramic particles can be promoted, thick dendritic crystals are crushed, a microcosmic structure is refined, and accordingly the integral performanceof the two-dimension titanium-based functional gradient material is improved.

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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