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Post-treatment method for Ni3Al-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 uniform joint structure

Active Publication Date: 2021-12-03
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Post-treatment method for Ni3Al-based single crystal alloy after welding
  • Post-treatment method for Ni3Al-based single crystal alloy after welding
  • Post-treatment method for Ni3Al-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: Ni 3 Al-based single crystal alloys were 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 were brazed to obtain post-welded Ni 3 Al-based single crystal alloy.

[0033] In the present invention, the Ni 3 The type of the Al-based single crystal alloy is not particularly limited, and any type 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 The Al-based single crystal alloy is preferably heat-treated Ni 3 Al-based single crystal alloy; the present invention does not have any special limitation on the heat treatment process, it can be carried out by using th...

Embodiment 1

[0057] Cut the heat-treated IC21 single crystal rod into alloy blocks, grind the cross section and clean it ultrasonically for 15 minutes with acetone. Carry out butt joint tooling and fixation of two alloy blocks again, control gap to be 50 μ m, adopt platinum sheet to carry out spot welding and fix, then solder (B: 1wt%, Si: 3wt%, Ti: 7wt%, Al: 3wt%, Co : 9wt%, W: 4wt%, Cr: 11wt%, Ni: balance) coating and welding joint around, to obtain the IC21 alloy after pretreatment;

[0058] The IC21 after the pretreatment is placed in a vacuum heat treatment furnace and vacuumed to ≤7×10 -3 After Pa, raise the temperature from room temperature to 465°C at a heating rate of 10°C / min, and keep it for 30 minutes; ℃ to 1240℃, keep it warm for 120min, and then cool down with the furnace to obtain Ni after welding. 3 Al-based single crystal alloy;

[0059] The welded Ni 3 The Al-based single crystal alloy is placed in a tube furnace, heat-treated at 1050 °C for 10 h, and air-cooled to ob...

Embodiment 2

[0064] Cut the heat-treated IC21 single crystal rod into alloy blocks, grind the cross section and clean it ultrasonically for 15 minutes with acetone. Carry out butt joint tooling and fixation of two alloy blocks again, control gap to be 50 μ m, adopt platinum sheet to carry out spot welding and fix, then solder (B: 1wt%, Si: 3wt%, Ti: 7wt%, Al: 3wt%, Co : 9wt%, W: 4wt%, Cr: 11wt%, Ni: balance) coating and welding joint around, to obtain the IC21 alloy after pretreatment;

[0065] The IC21 after the pretreatment is placed in a vacuum heat treatment furnace and vacuumed to ≤7×10 -3 After Pa, raise the temperature from room temperature to 465°C at a heating rate of 10°C / min, and keep it for 30 minutes; ℃ to 1240℃, keep it warm for 120min, and then cool down with the furnace to obtain Ni after welding. 3 Al-based single crystal alloy;

[0066] The welded Ni 3 The Al-based single crystal alloy is placed in a tube furnace, heat-treated at a temperature of 1100 °C for 10 h, and...

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Abstract

The invention relates to the technical field of post-welding treatment, in particular to a post-welding post-treatment method for Ni3Al-based single crystal alloy. The post-treatment method provided by the invention comprises the following step: carrying out heat treatment on the welded Ni3Al-based single crystal alloy to obtain a welded part of the Ni3Al-based single crystal alloy, wherein the temperature of the heat treatment is 1050 to 1100 DEG C. According to the record of the embodiment, the tensile strength of a welding piece of the Ni3Al-based single crystal alloy obtained after heat treatment at the temperature of 980 DEG C is 650 MPa or above, and the tensile strength of a base body is 95% or above. And the post-treatment method is simple, conditions are easy to control, and the method can be suitable for large-scale industrial production and has remarkable industrial application value and economic benefits.

Description

technical field [0001] 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. 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 aeroengines. but you 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) is 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 reliability...

Claims

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Application Information

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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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