High-strength diffusion connection method for titanium-steel alloy

Abstract

The invention relates to a high-strength diffusion connection method for a titanium-steel alloy, and belongs to the technical field of welding. The method comprises the following steps that a composite intermediate layer is increased between the welding surface of a titanium alloy welding part and the welding surface of a steel alloy welding part, and then placed in a vacuum diffusion furnace for diffusion connection, so that the titanium alloy welding part and the steel alloy welding part are connected into an integrated structure through the composite intermediate layer, wherein the composite intermediate layer is formed by compounding a nickel foil, a copper foil and a niobium foil. Nickel, copper and niobium are adopted as the composite intermediate layer, and the composite intermediate layer is in diffusion connection with the titanium alloy and the steel alloy, so that the connection strength of the titanium alloy and the steel alloy is improved, and the method can meet the manufacturing technical requirements in the field of high-end equipment such as aviation and spaceflight.

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 easily generated during welding heatin...

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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