A method to improve the strong plasticity of β-type γ-tial alloy

A technology of alloying and plasticity, which is applied in the field of improving the strong plasticity of β-type γ-TiAl alloys, and can solve problems such as not reflecting the excellence of performance

Active Publication Date: 2021-12-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is only applied to the traditional γ-TiAl alloy, and it does not reflect the superior performance of the β-type γ-TiAl alloy.

Method used

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  • A method to improve the strong plasticity of β-type γ-tial alloy
  • A method to improve the strong plasticity of β-type γ-tial alloy
  • A method to improve the strong plasticity of β-type γ-tial alloy

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Embodiment 1

[0040] A method to obtain high-strength plasticity TNM alloy, the alloy does not exist α unidirectional region, its T γ,solv The transformation temperature is 1260°C, and the deformation is carried out near the lower limit temperature of the (α+β) phase region;

[0041] Its specific implementation steps are as follows:

[0042] Step 1, hot isostatic pressing treatment is performed on the TNM alloy cast rod to eliminate casting defects, and the hot isostatic pressing system is 1280°C / 140MPa / 4h;

[0043] Step 2, turning the hot isostatic pressed TNM alloy cast rod to remove the surface oxide layer, and then wrap it with 304 stainless steel, the thickness of the stainless steel is 10mm; use nickel foil to isolate the wrapping and TNM alloy billet ;

[0044] Step 3, heat up the box-type high-temperature heat treatment furnace to the target temperature of 1260°C at a speed of 10°C / min, and place the wrapped TNM alloy billet in the box-type high-temperature heat treatment furnace ...

Embodiment 2

[0051] A method to obtain high-strength plasticity TNM alloy, the alloy does not exist α unidirectional region, its T γ,solv The transformation temperature is 1260°C, and the deformation is carried out near the lower limit temperature of the (α+β) phase region;

[0052] Its specific implementation steps are as follows:

[0053] Step 1, hot isostatic pressing treatment is performed on the TNM alloy cast rod to eliminate casting defects, and the hot isostatic pressing system is 1270°C / 160MPa / 4h;

[0054] Step 2, turning the hot isostatic pressed TNM alloy cast rod to remove the surface oxide layer, and then wrap it with 304 stainless steel; the thickness of the stainless steel is 11mm; the wrapping and the TNM alloy billet are separated by molybdenum foil ;

[0055] Step 3: Heat the box-type high-temperature heat treatment furnace to a target temperature of 1290°C at a rate of 10°C / min, and place the wrapped TNM alloy billet in the box-type high-temperature heat treatment furn...

Embodiment 3

[0062] It is a method to obtain high-strength plasticity TNM alloy, which does not have α-unidirectional region, and its T γ,solv The transformation temperature is 1260°C, and the deformation is carried out near the lower limit temperature of the (α+β) phase region;

[0063] Its specific implementation steps are as follows:

[0064] Step 1, hot isostatic pressing treatment is performed on the TNM alloy cast rod to eliminate casting defects, and the hot isostatic pressing system is 1300°C / 130MPa / 2h;

[0065] Step 2, turning the TNM alloy cast rod in the hot isostatic pressing state to remove the surface oxide layer, and then wrap it with 304 stainless steel; the thickness of the stainless steel is 12mm; the wrapping and the TNM alloy billet are separated by nickel foil ;

[0066] Step 3: Heat the box-type high-temperature heat treatment furnace to a target temperature of 1290°C at a rate of 10°C / min, and place the wrapped TNM alloy billet in the box-type high-temperature heat...

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Abstract

The present application relates to a method for improving the strong plasticity of β-type γ-TiAl alloys, which includes hot isostatic pressing of TiAl alloy casting rods; removing the surface oxide layer of TiAl alloy casting rods in hot isostatic pressing state, and then treating them Sheathing: heat and heat-preserve the sheathed TiAl alloy billet at a high temperature, and after the heat preservation is completed, quickly transfer the sheathed TiAl alloy billet to the lifting table of the extruder for extrusion processing to obtain the sheathed TiAl alloy billet The TiAl alloy extruded rod or billet is cooled to room temperature in the air environment, wherein the extrusion ratio is 3-12; the TiAl alloy extruded rod or billet with sheath is annealed , After the annealing is completed, cool to room temperature with the furnace; remove the jacket. This application adopts high-temperature sheathed extrusion to obtain a TiAl alloy with ideal lamellar orientation, fine lamellar clusters and small lamellar spacing; it can significantly improve the comprehensive mechanical properties of TiAl alloy and increase its service temperature.

Description

technical field [0001] The application belongs to the technical field of thermal deformation of TiAl alloys, and in particular relates to a method for improving the strong plasticity of β-type γ-TiAl alloys. Background technique [0002] TiAl alloy has many advantages such as low density, high specific strength, high specific modulus, and good creep resistance, oxidation resistance, and combustion resistance, and has broad application prospects in the fields of aviation and aerospace. The use of TiAl alloys instead of nickel-based superalloys in aeroengine turbine blades and vehicle engine turbocharger turbines can significantly improve the performance of the engine. The American Boeing Company announced in 2007 that the 6th and 7th low-pressure turbine blades made of cast Ti-4822 alloy were used in the GEnx engine. The degree of alloying of traditional TiAl alloy is low, the types of alloying elements are less, the content is low, and the content of Al is high (47–48at%), ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18B21C37/04B21C37/00
CPCC22F1/183B21C37/04B21C37/00
Inventor 寇宏超强凤鸣唐斌赵瑞峰李金山
Owner NORTHWESTERN POLYTECHNICAL UNIV
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