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Research progress of diffusion bonding between titanium alloy and stainless steel

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Document pages: 15 pages

Abstract: The high-quality joint between titanium alloy and stainless steel has been applied in nuclear, petrochemical, low temperature and aerospace industries because of its relatively low cost, light weight, high corrosion resistance and considerable mechanical properties. The diffusion bonding between titanium alloy and stainless steel with or without interlayer is reviewed in this paper. For diffusion bonding of titanium alloy and stainless steel without interlayer, the optimal temperature is 800-950 ° C and the duration is 60-120   the minimum intact joint can be obtained, but brittle FETI and Fe Cr Ti phases are formed at the interface. The development process of the joint mainly includes three steps: matching surface closure, the growth of brittle intermetallic compounds and the formation of KIkendall voids. Growth kinetics of interfacial phases needs further clarification in terms of growth velocity of the reacting layer, moving speed of the phase interface, and the order for a new phase appears. The influence of Cu, Ni (or nickel alloy), and Ag interlayers on the microstructures and mechanical properties of the joints is systematically summarized. The content of FeTi and Fe-Cr-Ti phases at the interface can be declined significantly by the addition of an interlayer. Application of multi-interlayer well prevents the formation of intermetallic phases by forming solid solution at the interface, and parameters can be predicted by using a parabolic diffusion law. The selection of multi-interlayer was done based on two principles: no formation of brittle intermetallic phases and transitional physical properties between titanium alloy and stainless steel.

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