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Deformed nickel-based alloy and brazing process of cast Ni3Al-based alloy

A brazing process and nickel-based alloy technology, which is applied in the manufacture of tools, metal processing equipment, welding equipment, etc., can solve problems such as high cost and complex structure, achieve low equipment requirements, improve high-temperature mechanical properties, and reduce joint brittleness Effect

Active Publication Date: 2019-11-01
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN105382406A discloses a vacuum diffusion brazing method of TiAl alloy and Ni-based superalloy. This method obtains TiAl-Ni dissimilar metal welded joints with high strength and good formability, but this method needs to be carried out in a vacuum hot-press furnace. Compared with the vacuum brazing furnace, an additional pressurizing device is required, and the structure is more complicated and the cost is high

Method used

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  • Deformed nickel-based alloy and brazing process of cast Ni3Al-based alloy
  • Deformed nickel-based alloy and brazing process of cast Ni3Al-based alloy
  • Deformed nickel-based alloy and brazing process of cast Ni3Al-based alloy

Examples

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Effect test

Embodiment 2

[0047] The difference between this example and Example 1 is that in step 3, the temperature was raised to 1170°C at a heating rate of 5°C / min and kept for 2 hours. Others are the same as in Example 1.

[0048] Obtain deformed nickel-based alloy GH4169 alloy and Ni-Cr-Al cast Ni 3 Al-based superalloy diffusion brazing joints, the highest shear strength is 565MPa. There is no enrichment of elements in a certain area of ​​the welded joint and there are no cracks, pores and other defects in the weld.

Embodiment 3

[0050] The difference between this embodiment and the embodiment 1 is that in the second step, the nickel-based solder and the gel binder are mixed into a paste, that is, no flux is added, and the others are the same as the embodiment 1. The thickness of the intermediate layer alloy (brazing seam) is 50 μm.

[0051] A brazed joint is obtained, and its microscopic appearance is as follows image 3 As shown, there are obvious welding defects at the welded joints, and the cracks are large and serious.

Embodiment 4

[0053] The difference between this embodiment and Example 1 is that the brazing flux is changed to the brazing flux of 201, its main component: Na 2 B 4 o 7 : 12%, CaF 2 : 10%, the remainder is B 2 o 3 , others are identical with embodiment 1.

[0054] A diffusion brazed joint is obtained, and its microscopic morphology is as follows Figure 4 As shown, the welded joint is greatly improved compared with Example 3, but still has welding defects such as pores and cracks, and the shear strength is only 226MPa.

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Abstract

The invention relates to a deformed nickel-based alloy and a brazing process of a cast Ni3Al-based alloy. The process comprises the following steps of carrying out surface treatment on a to-be-weldedpart of a to-be-welded base material; a nickel-based brazing filler metal, a brazing flux and a gel binding agent are mixed into paste, the paste-shaped brazing filler metal is laid on the surface ofthe to-be-welded base material, the other to-be-welded base material is stacked on the brazing filler metal to obtain the lap-jointed brazing sample; placing the lap-jointed brazing sample in a clampand putting in a tube furnace; after the brazing assembly is placed in a tube furnace, introducing protective gas, then heating to 1150 -1200 DEG c in a segmented manner; performing segmented coolingafter welding, cooling to room temperature; placing the welded sample which is cooled to room temperature in a box furnace under atmospheric conditions for treatment, wherein the heat preservation temperature is 600-650 DEG c, the time is 2-4 hours, and then taking out after cooling to room temperature along with the furnace. According to the process, the oxidation of the Ni-Cr-Al-based cast Ni3Al-based high-temperature alloy can be avoided, the base material is not damaged, the components of the joint are uniform, the high-temperature resistance of the welded joint is improved, and the residual stress is reduced.

Description

technical field [0001] The invention relates to the technical field of superalloy welding, in particular to a deformed nickel-based alloy and a Ni-Cr-Al system Ni 3 Diffusion brazing process of Al-based cast superalloys. Background technique [0002] The wrought nickel-based alloy GH4169 has excellent high-temperature strength, structural stability, cold and hot forming and welding performance between -253 and 650 °C, and has been widely used in hot-end components in aviation, aerospace, energy and power industries. Ni-Cr-Al cast Ni 3 Al-based superalloy (main components are: Cr: 7.4-8.2%, Al: 7.6-8.5%, Ti: 0.6-1.2, Mo: 3.5-5.5%, Fe<2%, Hf: 0.3-0.9%, W: 1.5~2.5%, the balance is Ni) is a kind of Ni that can be used for a long time at 850~1100℃ 3 Al-based superalloy, which has high strength, low density, high melting point, high specific stiffness and yield strength, and good oxidation resistance and creep resistance in a large temperature range, has a wide range of appl...

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K1/20B23K3/08B23P15/00
CPCB23K1/008B23K1/20B23K3/08B23P15/00
Inventor 陈学广杨东辉张子晨李京桉仉建波赵庆锋丁俭夏兴川
Owner HEBEI UNIV OF TECH
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