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CN-122007590-A - Niobium-based and nickel-based alloy hot isostatic pressing connection method for designing intermediate layer based on phase diagram

CN122007590ACN 122007590 ACN122007590 ACN 122007590ACN-122007590-A

Abstract

The invention provides a hot isostatic pressing connection method of niobium-based and nickel-based alloy based on a phase diagram design interlayer, and belongs to the field of dissimilar material connection preparation. The method comprises the steps of analyzing element compositions of a niobium base to be connected and a nickel base alloy to be used as an element screening range, determining a target temperature range according to the service temperature of a material, calculating a Ni-X-Nb ternary phase diagram to obtain a ternary phase diagram calculation result of each element to be screened and combination of Ni and Nb, screening gradient paths which do not pass through a harmful IMCs phase region, determining the only alloy element composition Ni-Z-Nb which can be used as an intermediate layer according to the principle that the paths are the simplest, the alloy cost is the lowest, the harmful IMCs phase region is the narrowest and the thermal expansion coefficient is the most similar, preparing a Ni-Z-Nb alloy material, processing the Ni-Z-Nb alloy material into blocks with the thickness of 3-5 mm, filling the blocks into an outer sheath as the intermediate layer to form diffusion pairs, and performing hot isostatic pressing diffusion connection. The method improves the connection effect of the niobium-based alloy and the nickel-based alloy.

Inventors

  • ZHANG BONING
  • LIU LAN
  • ZHANG BINGJIE
  • SHEN CHAO
  • ZHENG LEI

Assignees

  • 北京科技大学

Dates

Publication Date
20260512
Application Date
20251231

Claims (10)

  1. 1. A method for hot isostatic pressing connection of a niobium-based nickel-based alloy with an intermediate layer based on a phase diagram, which is characterized by comprising the following steps: S1, analyzing element compositions of a niobium-based alloy to be connected and a nickel-based alloy to be connected, and taking the element compositions as an element screening range of an intermediate layer material; S2, determining a target temperature range calculated by hot isostatic pressing and a phase diagram according to the service temperature of the material; s3, calculating a Ni-X-Nb ternary phase diagram in a target temperature range to obtain a ternary phase diagram calculation result of each alloy element to be screened combined with Ni and Nb; S4, screening according to a ternary phase diagram calculation result, namely screening X1 element and NiX1/NiNbX alloy according to a narrowest principle of a harmful IMCs phase region, screening X2 element and NiX2/NiNbX alloy according to a path simplest principle, and determining a Ni-Z-Nb alloy material serving as an optimal intermediate layer according to a thermal expansion coefficient closest principle; S5, preparing a Ni-Z-Nb alloy material serving as an intermediate layer, and processing the Ni-Z-Nb alloy material into blocks with the thickness of 3-5 mm, sequentially stacking nickel-based alloy, ni-Z-Nb alloy and niobium-based alloy blocks into an outer sheath to form a diffusion couple; and S6, putting the diffusion couple containing the sheath into a hot isostatic pressing furnace for diffusion connection.
  2. 2. The method according to claim 1, wherein the alloying elements to be screened in step S1 comprise Co, cr, fe, mn, ta, W, mo, ti, V, zr and Hf.
  3. 3. The method according to claim 1, wherein in step S2 a temperature range of 100-200 ℃ higher than the service temperature is selected as the target temperature range for the hot isostatic pressing and phase diagram calculation.
  4. 4. The method of claim 3, wherein the service temperature is 800-850 ℃, and the target temperature range is 900-1050 ℃.
  5. 5. The method of claim 1, wherein the ternary phase diagram calculation in step S3 includes phase composition type and phase fraction, phase composition area distribution, path, and coefficient of thermal expansion over a temperature range.
  6. 6. The method of claim 1, wherein in step S4, X1 comprises Co, cr, fe, mn, ta, W, zr, hf elements and X2 comprises V and Mo elements.
  7. 7. The method of claim 6, wherein Z in the S4Ni-Z-Nb alloy material represents only Ti, and wherein the Nb content is 0.
  8. 8. The method according to claim 1, wherein in the step S6, during diffusion bonding, a sintering temperature is selected in a target temperature range, and after the temperature is raised to the sintering temperature, the temperature is kept for 2 to 4 hours, so that diffusion bonding is completed.
  9. 9. The method according to claim 8, characterized in that specific hot isostatic pressing parameters are as follows: Heating to 900-1050 ℃ at a temperature rising rate of 10 ℃ per minute, heating to 110-130 MPa at a pressure rising rate of 3-5 MPa per minute, preserving heat and pressure at the target temperature and pressure, sintering for 2-4 h, heating to 300 ℃ at a temperature reducing rate of 5 ℃ per minute after the completion, and cooling to room temperature along with a furnace.
  10. 10. The method of claim 1, wherein step S5 further comprises polishing the sample connection surfaces prior to loading the sheath, sequentially polishing with 400# SiC sandpaper, 800# SiC sandpaper, 1000# SiC sandpaper, 2000# SiC sandpaper, and ultrasonically cleaning with ethanol.

Description

Niobium-based and nickel-based alloy hot isostatic pressing connection method for designing intermediate layer based on phase diagram Technical Field The invention belongs to the field of dissimilar material connection preparation, and particularly relates to a hot isostatic pressing connection method for niobium-based and nickel-based alloys based on a phase diagram design interlayer. Background The nickel-based alloy is a key material of a hot end part of aerospace because of excellent high-temperature fatigue strength, fracture toughness, creep resistance and oxidation resistance, and has high melting point, low density and high stability, thus being an ultra-high temperature material in the aerospace field. The reliable connection of the niobium-based alloy and the nickel-based alloy is realized, and the method has important significance for the development targets of high performance and light weight of key structural parts in the fields of aerospace and the like. However, the existing conventional welding method is adopted to directly connect the niobium-based alloy and the nickel-based alloy, so that severe reaction often occurs at the interface of the niobium-based alloy and the nickel-based alloy to generate brittle intermetallic compounds (IMCs) such as Ni 6Nb7、Ni2 Nb and the like, and the high-temperature strength and toughness of the material are seriously weakened. The additive manufacturing method (such as laser directional energy deposition) can realize the design of component gradient at the interface by changing the component proportion of each powder feeding, and avoid the generation of harmful IMCs, but the method relies on secondary remelting of powder, has complex evolution of a molten pool and a temperature field, high control difficulty and easy deviation of actual components and performances of a connecting area from preset gradient. The hot isostatic pressing is a solid diffusion connection process thoroughly avoiding the problem of secondary remelting, a proper interlayer material is introduced on the basis of the process, the hot isostatic pressing time, the thickness of the interlayer and the like are regulated and controlled, an ideal component gradient at an interface can be obtained, and high-quality connection between the interlayer and a base metal is realized. In the prior art, when a hot isostatic pressing method is adopted to connect the niobium-based alloy and the nickel-based alloy, the middle layer is mostly an oxide dispersion strengthening material (ODS) or a multi-layer metal material. For example, china patent with publication number CN120115807A discloses a hot isostatic pressing diffusion connection method for nickel-based alloy and niobium-based alloy, adopts an ODS copper alloy interlayer, remarkably inhibits severe interface reaction between the niobium-based alloy and the nickel-based alloy, avoids generation of harmful IMCs, but also limits the reliability of long-term service under extreme environment due to strong diffusion inhibition effect of ODS material and poor wettability of the ODS material and the bonding strength between the ODS material and a base metal, and Chinese patent with publication number CN120133906A designs a Pd-W alloy and Mo-La alloy double-layer metal interlayer, and ensures the connection performance of the interlayer and the base metal, but the multi-layer interface structure increases the process complexity, and raw materials Pd, mo and La are expensive and have extremely low economic benefit. In conclusion, the phase diagram design is combined with hot isostatic pressing, so that the optimality of screening of the intermediate layer materials can be guaranteed, and high-quality dissimilar material connection can be realized through regulation and control of the process. Disclosure of Invention In order to solve the problems, the invention provides a hot isostatic pressing connection method for niobium-based and nickel-based alloy based on a phase diagram design interlayer, which realizes stable and high-quality connection with a base metal, avoids the generation of harmful IMCs, and can also meet the production requirements of high efficiency and low cost. In order to achieve the above purpose, the technical scheme adopted by the embodiment of the invention is as follows: The hot isostatic pressing connection method of the niobium-based nickel-based alloy based on the phase diagram design interlayer comprises the following steps: and S1, analyzing the element composition of the niobium-based alloy and the nickel-based alloy to be connected, and taking the element composition as an element screening range of an interlayer material. In this step, in order to provide the intermediate layer material with good thermodynamic compatibility with the base material, the elemental composition of the niobium-based alloy and the nickel-based alloy is selected as the elemental screening range of the intermediate layer material. The alloy eleme