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Connecting method of dissimilar gamma '-phase reinforced high-temperature alloy

A high-temperature alloy and connection method technology, which is applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve the problems of large changes in microstructure

Active Publication Date: 2022-06-24
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method achieves fine control of the pre-weld microstructure of the base metal by optimizing the heat treatment process, and adjusts the TLP diffusion bonding process and the interdiffusion behavior between the intermediate layer alloy and the base metal according to the pre-weld microstructure to solve the problem of 718Plus alloy and Ni 3 The rapid precipitation of the γ′ phase and the large change in the microstructure of the Al-based alloy during the TLP diffusion bonding process avoid the occurrence of defects such as voids, cracks, and coarse cemented carbide in the joint area, and obtain a uniform microstructure and good mechanical properties. TLP Diffusion Connection Fittings

Method used

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  • Connecting method of dissimilar gamma '-phase reinforced high-temperature alloy
  • Connecting method of dissimilar gamma '-phase reinforced high-temperature alloy
  • Connecting method of dissimilar gamma '-phase reinforced high-temperature alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1, preprocessing:

[0039] Use a wire cutting machine to cut the Ni 3 Al-based superalloys were cut into 25×10×3mm specimens, and 718Plus alloys were cut into 15×10×3mm specimens.

[0040] Step 2, stress relief annealing:

[0041] The two box furnaces were heated to 850°C and 850°C respectively. After the temperature was stable, the Ni obtained in the first step was 3 The samples of Al-based superalloy and 718Plus alloy were put into preheated corundum crucibles, and the corundum crucibles containing the samples were placed in the constant temperature zones of the two box furnaces, respectively, and kept for 2 hours and 7 hours respectively. After oven cool to room temperature.

[0042] Step 3, solution treatment:

[0043] The box furnace was heated to 1160°C, and after the temperature was stable, the Ni 3 The corundum crucible of the Al-based superalloy sample is placed in the constant temperature zone of the box furnace, and the sample is kept in the box fur...

Embodiment 2

[0054] The difference between this example and Example 1 is that the two base metal alloys are not subjected to the stress relief annealing process. 3 The Al-based superalloy is heated to 1100°C for 7 hours in the box furnace, and the 718Plus alloy is placed in the box furnace, heated to 960°C, and the solution treatment is performed for 3 hours; in step 7, the temperature is raised to 1040° C., holding for 30 minutes to complete the diffusion connection to form a joint, and after the holding is completed, it is cooled to room temperature with the furnace and taken out.

[0055] Others are the same as in Example 1.

[0056] Get ATI 718Plus alloy with Ni 3 Al-based superalloy TLP connector. The highest tensile strength is 410MPa, and the microhardness value is 578HV. The obtained TLP diffusion joint has very low tensile strength and poor mechanical properties. The elements in the joint area have obvious enrichment in a certain area, and have obvious defects such as pores and...

Embodiment 3

[0058] The difference between this example and Example 1 is that in step 3, the Ni 3 The Al-based superalloy is heated to a temperature of 1180 °C in a box furnace for 5 hours of solution treatment, and the 718Plus alloy is placed in a box furnace, heated to 900 °C, and subjected to a solution treatment for 4 hours; the temperature rises in step 7 At 1040° C., the temperature was maintained for 45 minutes to complete the diffusion connection to form a joint, and after the temperature preservation was completed, it was cooled to room temperature with the furnace and taken out.

[0059] Others are the same as in Example 1.

[0060] Get ATI 718Plus alloy with Ni 3 Al-based superalloy TLP connection joint, the microstructure of the welded joint is as follows image 3 shown. The highest tensile strength is 541MPa, and the microhardness value is 512HV. Compared with Example 2, the joint structure and mechanical properties of the obtained TLP diffusion connection joint have been g...

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Abstract

The invention relates to a connection method of a dissimilar gamma '-phase reinforced high-temperature alloy. According to the method, fine regulation and control of the pre-welding structure of the base metal are achieved through the processes of stress relief annealing, solid solution treatment, aging treatment and the like, and the TLP diffusion bonding process and the mutual diffusion behavior between the interlayer alloy and the base metal are adjusted according to the pre-welding structure; the problems of rapid precipitation of gamma'phase and large microstructure change of 718Plus alloy and Ni3Al-based alloy in the TLP diffusion bonding process are solved, the defects of cavities, cracks, thick hard alloy and the like in a joint area are avoided, and a TLP diffusion bonding joint with uniform microstructure and good mechanical property is obtained.

Description

technical field [0001] The invention belongs to the technical field of superalloy welding, in particular to an instantaneous liquid phase diffusion connection method for realizing dissimilar γ' phase strengthening superalloy. Background technique [0002] ATI718Plus (abbreviated as 718Plus) is a deformed nickel-based superalloy, which has excellent high temperature strength, high temperature creep properties, microstructure stability and hot workability, and is an ideal material for preparing aero-engine turbine disks. Ni 3 Al-based alloy is a kind of high-temperature alloy that can be used for a long time at 850-1100 ℃. It has the characteristics of low density, high specific strength and specific stiffness, high melting point, etc., and has good oxidation resistance and creep resistance in a large temperature range. Variable performance, mainly used in heat-resistant parts of aero-engines. Realization of 718Plus alloy with Ni 3 The reliable connection between Al-based a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/02B23K20/24B23K20/22B23K20/26B23K103/18
CPCB23K20/026B23K20/24B23K20/22B23K20/26B23K2103/18Y02E30/30
Inventor 夏兴川冯浩敏丁俭杨轶凯王玉江刘永长
Owner HEBEI UNIV OF TECH
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