A Forming Method of Ti/Al Dissimilar Alloy Based on Laser Selective Melting Technology

Abstract

The invention discloses a forming method of Ti / Al dissimilar alloy based on laser selective melting technology. Dry and pre-screen the aluminum alloy and titanium alloy powders; then prepare the program files and SLM equipment; then use the laser selective melting technology to form the bottom titanium alloy part first, and after the forming is completed, the titanium alloy powder in the powder supply cabin of the SLM equipment After replacing with aluminum alloy powder, continue to form the upper aluminum alloy part on the titanium alloy substrate through laser selective melting technology; finally use wire cutting equipment to cut the part from the substrate; laser selective melting technology can directly form complex parts and shorten production Cycle, improve forming efficiency, has great production and application value for the aerospace field; in addition, using laser selective melting technology, the cooling rate can reach 10 6 The order of magnitude, the rapid solidification of the molten pool greatly improves the solid solubility of aluminum in titanium alloys, overcomes the phenomenon of component segregation and achieves the effect of fine-grain strengthening.

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