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a kind of ni 3 Post-treatment method of al-based single crystal alloy after welding

A single crystal-based, post-processing technology, applied in heat treatment furnaces, heat treatment equipment, welding equipment, etc., can solve problems such as difficult control of external stress conditions, uneven joint structure, large residual stress, etc., and achieve significant industrial application value and economy Benefits, simple post-processing method, and wide isothermal solidification zone

Active Publication Date: 2022-06-28
BEIHANG UNIV
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Problems solved by technology

[0004] Although the vacuum brazing method can effectively weld the turbine blades, there are problems such as uneven joint structure, more hard and brittle joints, and large residual stress after welding, so that the performance of the joints may not meet the requirements for use.
In view of the above problems, mechanical stretching is generally used to solve the problem at present, but the method of mechanical stretching may appear miscellaneous crystals, resulting in poor mechanical properties, and the external stress conditions are difficult to control

Method used

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  • a kind of ni <sub>3</sub> Post-treatment method of al-based single crystal alloy after welding
  • a kind of ni <sub>3</sub> Post-treatment method of al-based single crystal alloy after welding
  • a kind of ni <sub>3</sub> Post-treatment method of al-based single crystal alloy after welding

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preparation example Construction

[0031] In the present invention, the post-weld Ni 3 The preparation method of Al-based single crystal alloy preferably includes: 3 Al-based single crystal alloys are brazed to obtain post-welded Ni 3 Al-based single crystal alloy; the brazing method is vacuum brazing.

[0032] In the present invention, Ni 3 Al-based single crystal alloys are brazed to obtain Ni after welding 3 Al-based single crystal alloy.

[0033] In the present invention, the Ni 3 The types of Al-based single crystal alloys are not particularly limited, and those well-known to those skilled in the art may be used. In a specific embodiment of the present invention, the Ni 3 The Al-based single crystal alloy is specifically an IC21 alloy.

[0034] In the present invention, the Ni 3 Al-based single crystal alloy is preferably Ni after heat treatment 3 Al-based single crystal alloy; the present invention does not have any special limitation on the process of the heat treatment, and the process can be p...

Embodiment 1

[0057] The heat-treated IC21 single-crystal rods were cut into alloy blocks, and the sections were ground and ultrasonically cleaned with acetone for 15 min. Then the two alloy blocks are fixed by butt tooling, the gap is controlled to 50 μm, and the platinum sheet is used for spot welding and fixing, and then the brazing filler metal (B: 1wt%, Si: 3wt%, Ti: 7wt%, Al: 3wt%, Co : 9wt%, W: 4wt%, Cr: 11wt%, Ni: balance) coating around the welded joint to obtain the IC21 alloy after pretreatment;

[0058] The IC21 after the pretreatment is placed in a vacuum heat treatment furnace, and the vacuum is evacuated to ≤7×10 -3 After Pa, the temperature was raised from room temperature to 465°C at a heating rate of 10°C / min, and kept for 30 minutes; the temperature was raised from 465°C to 980°C at a heating rate of 10°C / min, and the temperature was kept for 10 minutes; the heating rate was 3°C / min from 980°C The temperature was raised to 1240°C, kept for 120min, and then cooled with th...

Embodiment 2

[0064] The heat-treated IC21 single-crystal rods were cut into alloy blocks, and the sections were ground and ultrasonically cleaned with acetone for 15 min. Then the two alloy blocks are fixed by butt tooling, the gap is controlled to 50 μm, and the platinum sheet is used for spot welding and fixing, and then the brazing filler metal (B: 1wt%, Si: 3wt%, Ti: 7wt%, Al: 3wt%, Co : 9wt%, W: 4wt%, Cr: 11wt%, Ni: balance) coating around the welded joint to obtain the IC21 alloy after pretreatment;

[0065] The IC21 after the pretreatment is placed in a vacuum heat treatment furnace, and the vacuum is evacuated to ≤7×10 -3 After Pa, the temperature was raised from room temperature to 465°C at a heating rate of 10°C / min, and kept for 30 minutes; the temperature was raised from 465°C to 980°C at a heating rate of 10°C / min, and the temperature was kept for 10 minutes; the heating rate was 3°C / min from 980°C The temperature was raised to 1240°C, kept for 120min, and then cooled with th...

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Abstract

The invention relates to the technical field of post-welding treatment, in particular to a Ni 3 A post-treatment method after Al-based single crystal alloy welding. Post-processing method provided by the present invention comprises the following steps: Ni after welding 3 Al-based single crystal alloys are heat-treated to obtain Ni 3 A weldment of Al-based single crystal alloy; the temperature of the heat treatment is 1050-1100°C. According to the description of the embodiment, the Ni obtained after the heat treatment of the present invention is processed 3 The tensile strength of the Al-based single crystal alloy weldment at 980°C is above 650MPa, and the tensile strength of the matrix is ​​above 95%. Moreover, the post-processing method is simple, the conditions are easy to control, it is applicable to large-scale industrial production, and has significant industrial application value and economic benefits.

Description

technical field [0001] The invention relates to the technical field of post-weld treatment, in particular to a Ni 3 The post-processing method of Al-based single crystal alloy after welding. Background technique [0002] Ni 3 Al-based single crystal alloys have the characteristics of very high high temperature strength, good creep and fatigue resistance, excellent oxidation resistance and corrosion resistance, and reliable structure, and are widely used in turbine blades of aero-engines. But Ni 3 Al-based single crystal alloys have a high content of refractory elements, which are prone to thermal cracks in the weld zone and heat affected zone, resulting in poor weldability of superalloys. Therefore, vacuum brazing or transient liquid phase (Transient Liquid Phase) are usually used. , TLP) diffusion welding and other methods. Compared with other processes, vacuum brazing and TLP diffusion welding have the advantages of low difficulty, convenient operation and good reliabi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/50C22F1/10B23K1/008B23K1/20B23K3/06B23K3/08
CPCC21D9/50C22F1/10B23K1/008B23K1/20B23K1/206B23K3/08B23K3/087B23K3/06
Inventor 宫声凯梁资拓曹阳裴延玲李树索
Owner BEIHANG UNIV
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