Transition liquid phase diffusion bonding method for additive manufacturing stainless steel and zirconium alloy

Abstract

The invention discloses a transition liquid phase diffusion bonding method for additive manufacturing stainless steel and zirconium alloy, which comprises the following steps of: (1) sequentially stacking a high-temperature-resistant spacer, zirconium alloy, copper foil, nickel foil, additive manufacturing stainless steel and a high-temperature-resistant spacer in sequence to form a whole to be welded; (2) the whole to be welded is placed in a vacuum diffusion furnace cavity, vacuumizing is conducted, the diffusion welding temperature ranges from 880 DEG C to 980 DEG C, the diffusion welding pressure ranges from 0.5 MPa to 3 MPa, and the heat preservation time ranges from 60 min to 90 min; the thicknesses of the copper foil and the nickel foil are 30 microns to 50 microns; according to the method, the copper foil and the nickel foil are introduced between the zirconium alloy and the additive manufacturing stainless steel, so that the generation number of brittle phases in a diffusion welding joint is reduced to a certain extent, the residual stress of a connecting interface of the additive manufacturing stainless steel and the zirconium alloy can be effectively reduced, the generation of cracks is inhibited, and the comprehensive mechanical property of the welding joint is improved; and the shear strength result of the joint shows that the shear strength is greater than 90 MPa.

Description

technical field [0001] The invention relates to a welding method, in particular to a transition liquid phase diffusion connection method for additively manufacturing stainless steel and zirconium alloy. Background technique [0002] As an important structural material in the field of engineering equipment manufacturing, stainless steel has the advantages of high strength, low cost, and excellent corrosion resistance. Compared with traditional rolled stainless steel, additively manufactured stainless steel has more advantages in the manufacture of key complex-shaped parts, which has attracted more and more attention in the field of engineering manufacturing. Zirconium alloy has good corrosion resistance and high temperature resistance, and its own processing performance and thermal conductivity are also very good. It is a common material for reactor cladding and core structures. In the special environment of nuclear power equipment service, zirconium alloy has better erosion...

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Problems solved by technology

[0003] Patent CN 113814550 A "A Method for Diffusion Bonding Zirconium and Zirconium Alloys to Stainless Steel" proposes that the addition of a Ti intermediate layer prevents the direct contact between Zr and Fe elements to form brittle intermetallic compounds, but the stainless steel and additively manufactured stainless steel are microcosmic There are essential differences in the structure and welding characteristics, and the Ti element in the middle layer is easy to react with the Fe and Zr elements in the base metal to form a brittle phase, which reduces the performance of the joint and requires high processing; patent CN 102218592A "A kind of titanium or titanium alloy and stainless steel In the Diffusion Welding Method, the plate with the same material as the weldment is used to pre-weld the block structure, and then the thin slice is cut longitudinally, and the thin slice is treated as the middle layer for diffusion connection, which requires two diffusion connections. The process is complicated and the preparation longer period

[0004] At present, domestic and foreign studies on the diffusion bonding between stainless steel and zirconium alloys focus more on the connection between traditional stainless steel and zirconium alloys. There is no report on the diffusion bonding between stainless steel and zirconium alloys in additive manufacturing. Stainless steel with additive manufacturing has microscopic pores. , the atomic diffusion is not uniform, and the welding is difficult

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