Method for forming Ti/Al dissimilar alloy based on laser selective melting technology

Abstract

The invention discloses a method for forming a Ti / Al dissimilar alloy based on a laser selective melting technology. Drying and pre-screening treatment are carried out on aluminum alloy and titanium alloy powder; then program files and SLM equipment are prepared; the laser selective melting technology is used for forming a bottom titanium alloy part, after forming is completed, the titanium alloypowder in a powder supply chamber of the SLM equipment is replaced with the aluminum alloy powder, and the laser selective melting technology is continuously used for forming an upper aluminum alloy part on the titanium alloy substrate; and finally, wire cutting equipment is used for cutting parts from the substrate. The laser selective melting technology can directly form the complex parts, shortens the production cycle, improves the forming efficiency and has great production and application value in the aerospace field; and in addition, the laser selective melting technology is adopted, thecooling rate can reach 106 orders of magnitude, a molten pool rapidly solidifies, the solid solubility of aluminum in the titanium alloy is greatly improved, the phenomenon of component segregation is overcome, and the effect of refined crystalline strengthening is achieved.

Description

technical field [0001] The invention belongs to the technical field of laser selective melting technology rapid prototyping method, and in particular relates to a forming method of Ti / Al dissimilar alloy based on laser selective melting technology. Background technique [0002] Both aluminum alloy and titanium alloy have the advantages of light density, high specific strength (the strength of titanium alloy is close to that of medium-strength steel), good corrosion resistance and high temperature performance, etc. In aerospace applications, titanium-aluminum dissimilar alloy components can greatly reduce the overall weight , can significantly improve the economic efficiency. However, aluminum and titanium are very active metals, which are easily oxidized to form TiO in the air. 2 and Al 2 o 3 and other oxides. Moreover, there are large differences in physical and mechanical properties between aluminum and titanium, and there are large differences in the lattice type and ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a forming method of Ti / Al dissimilar alloys based on laser selective melting technology, which solves the problem that the existing titanium / aluminum alloy dissimilar alloys are difficult to obtain due to the low solubility, large difference in thermal expansion coefficient and thermal conductivity. The problem of joining, the preparation of a high-strength Ti / Al dissimilar alloy