A kind of titanium-steel alloy high-strength diffusion joining method

Abstract

The invention relates to a titanium-steel alloy high-strength diffusion connection method, which belongs to the field of welding technology. The method of the present invention includes: adding a composite intermediate layer between the welding surfaces of the titanium alloy weldment and the steel alloy weldment, and then placing it in a vacuum diffusion furnace for diffusion connection, so that the titanium alloy weldment and the steel alloy weld The components are connected into an integral structure through a composite intermediate layer, wherein the composite intermediate layer is made of nickel foil, copper foil and niobium foil. By using nickel, copper, and niobium as the composite intermediate layer for diffusion connection with titanium alloy and steel alloy, the connection strength between titanium alloy and steel alloy is improved, and it can meet the manufacturing technical requirements of aviation, aerospace and other high-end equipment fields.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a titanium-steel alloy high-strength diffusion bonding method. Background technique [0002] The composite component of titanium and steel has the advantages of both titanium and steel, and can save titanium resources. It can give full play to the complementary advantages of the two materials in terms of performance and economy. It has broad application prospects in aerospace, aviation, petrochemical and other fields. . In addition to reasonable design and structure, the composite component of titanium and steel should also meet various requirements such as strength, vacuum compactness, thermal stability, wear resistance, corrosion resistance, electrical conductivity and dimensional accuracy. However, due to the large difference in linear expansion coefficient and thermal conductivity between titanium and steel, large internal stresses are likely to occur during welding heating...

AI Technical Summary

Problems solved by technology

For example, the analysis of the diffusion-welded joint between titanium alloy TC4 and stainless steel 1Crl8Ni9Ti draws the following conclusion: due to the interdiffusion and migration of base metal components, a multi-layered solid solution and intermetallic compound is formed near the interface. The transition structure is mainly composed of TiFe2 and TiFe brittle phases, which seriously affects the performance of the joint, and the joint strength is low

The method of adding an intermediate layer is one of the ways to solve the connection between the two, and titanium can only achieve solid solution with a few elements to achieve welding. Using a reasonable intermediate layer can improve the quality of the connection between titanium and steel, but now The technical intermediate layer is easy to produce brittle phase or low melting point eutectic, which affects the welding quality

And, the welding process is too complicated, which is not conducive to the actual production application

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