Connecting method for TiAl-Ni dissimilar metal

A connection method and technology of dissimilar metals, applied in metal processing equipment, welding equipment, welding/welding/cutting items, etc., can solve the problems of reducing joint strength, performance changes, and difficulty in obtaining welded joints, etc., and achieve high joint strength.

Active Publication Date: 2016-03-09
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Both solid phase diffusion welding and instantaneous liquid phase diffusion welding have the following disadvantages in welding TiAl alloy and Ni-based superalloy, making it difficult to obtain ideal welded joints:
[0007] (1) The welding temperature of solid-phase diffusion welding and instantaneous liquid-phase diffusion welding is relatively high, and a series of changes may occur in the base metal at high temperature, such as high-temperature creep, phase transformation, etc., and its structure and properties will change, reducing the The performance of welded joints, for example, the Ni-based superalloy GH4049 will have a phase transition point at 850°C, and its properties will change when the temperature is higher than the phase transition point
[0008] (2) When solid-phase diffusion welding and instantaneous liquid-phase diffusion welding weld TiAl alloys and Ni-based superalloys, Ti-Ni-Al ternary intermetallic compounds will be formed at the welded joints, which greatly reduces the joint strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Using GH4043 and Ti-48Al alloy materials with a size of 3mm×50mm×50mm as the base material, 80μm×50mm×50mm Ni 40 Ti 50 Cu 10 The amorphous alloy foil is used as the intermediate layer for the instantaneous supercooled liquid phase diffusion welding process.

[0031] Specific steps are as follows:

[0032] 1) Before welding, use M10 sandpaper to clean the connection surface of nickel-based superalloy and TiAl alloy foil, remove the oxide film and oil stain on the surface, and obtain a connection surface with better flatness and roughness;

[0033] 2) TiAl, intermediate layer foil, and Ni-based superalloy are stacked in sequence, and placed in a vacuum hot-press furnace for welding. When the vacuum degree of the vacuum hot pressing furnace reaches 1×10 -2 At Pa, the hot-press furnace starts heating. During the heating process, keep the welding pressure at 2Mpa, and control the heating rate at 20°C / min. When the temperature in the hot-press furnace reaches 500°C, keep ...

Embodiment 2

[0038] With GH4049 and Ti-48Al of Φ20mm×10mm as the base material, Ni 40 Ti 50 Cu 10 Amorphous alloy powder is used as an intermediate layer for instantaneous supercooled liquid phase diffusion welding process.

[0039] 1) Clean the upper and lower planes of GH4049 and Ti-48Al alloy with sandpaper to remove the oxide film and oil stain on the surface;

[0040] 2) Coat Ni40Ti50Cu10 amorphous alloy powder on the surface to be welded so that the thickness of the intermediate layer is 100 μm, and then put it into a vacuum hot-press furnace. When the vacuum degree of the vacuum hot-pressing furnace reaches 1×10-2Pa, the hot-pressing furnace starts heating. During the heating process, keep the welding pressure at 2Mpa, and control the heating rate at 20°C / min until the temperature in the hot-pressing furnace reaches 500°C. Keep warm for 5 minutes to connect, then raise the temperature to 800°C and keep warm for 2 hours for diffusion;

[0041] 3) After waiting for the vacuum hot ...

Embodiment 3

[0045] With GH4099 and Ti-48Al of Φ20mm×10mm as the base material, Ti 47 Ni 47 Al 6 Amorphous alloy powder is used as an intermediate layer for instantaneous supercooled liquid phase diffusion welding process.

[0046] 1) Clean the upper and lower planes of GH4099 and Ti-48Al alloy with sandpaper to remove the oxide film and oil stain on the surface;

[0047] 2) Coat the Ti47Ni47Al6 amorphous alloy powder on the surface to be welded so that the thickness of the intermediate layer is 150 μm, and then put it into a vacuum hot-press furnace. When the vacuum degree of the vacuum hot pressing furnace reaches 1×10-2Pa, the hot pressing furnace starts heating. During the heating process, keep the welding pressure at 2Mpa, and control the heating rate at 20°C / min until the temperature in the hot pressing furnace reaches 450°C Insulate for 5 minutes for connection, then increase the temperature to 800°C for 2 hours for diffusion;

[0048]3) After waiting for the vacuum hot pressing...

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Abstract

The invention discloses a connecting method for TiAl-Ni dissimilar metal. According to the method, a block amorphous alloy material serves as a middle layer during welding, and connection is achieved through the superplasticity of the amorphous alloy material in a supercooled liquid region. Then the amorphous layer is dispersed into a base material by improving the temperature, and therefore metallurgical bonding welding is achieved. The connecting method is particularly suitable for welding of plates. By means of the welding method, a TiAl-Ni dissimilar metal welding connector with high strength and good forming performance can be obtained. When GH4049 and Ti-48Al serve as the base material and Ni40Ti50Cu10 amorphous alloy powder serves as the middle layer, the highest tension strength can reach 480 MPa.

Description

technical field [0001] The invention relates to a connection method of TiAl-Ni dissimilar metals, belonging to the field of dissimilar metal welding. Background technique [0002] TiAl alloy is a material with relatively low density, high specific stiffness, specific strength, excellent oxidation resistance, and good high-temperature mechanical properties. It is considered to be an ideal new lightweight high-temperature structural material with wide application prospects. . Ni-based superalloys have the advantages of high strength, good plasticity, excellent oxidation resistance and corrosion resistance, and long-term stability of their structures under service conditions, and can be widely used in various high-temperature and high-efficiency components. Effectively connecting Ni-based superalloys and TiAl-based alloys is the key to expanding the application of TiAl-based alloys in the aerospace field. However, due to the many differences in physical, chemical and mechanica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/14B23K103/18
CPCB23K20/14B23K2103/18
Inventor 孔见梁玉龙王克鸿周琦彭勇
Owner NANJING UNIV OF SCI & TECH
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