Preparing method of TiAl alloy turbine blade

A technology for turbine blades and alloys, which is applied in the field of preparation of TiAl alloy turbine blades. It can solve the problems of reducing the comprehensive performance of TiAl alloys, high brittleness of TiAl alloys at room temperature, and restrictions on the application of TiAl alloys, so as to achieve good interlayer bonding and avoid deformation and fracture. Phenomenon, the effect of reducing internal thermal stress

Active Publication Date: 2018-04-20
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] At present, traditional casting or forging processes are mainly used for forming TiAl alloys, but TiAl alloys are difficult to deform at high temperatures, and are prone to defects such as cracks and uneven structures during hot rolling.
TiAl alloy is brittle at room temperature, and heat treatment after forging will lead to coarse and unstable lamellar structure, which further reduces the comprehensive performance of TiAl alloy and restricts the application of TiAl alloy.
In addition, TiAl alloys have the problems of high processing difficulty and high scrap rate in realizing complex configurations, especially thin-walled and inner runner configurations.

Method used

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  • Preparing method of TiAl alloy turbine blade
  • Preparing method of TiAl alloy turbine blade
  • Preparing method of TiAl alloy turbine blade

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Experimental program
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Effect test

Embodiment 1

[0032] This embodiment includes the following steps:

[0033] Step 1, at first utilize CAD three-dimensional drawing software to set up the three-dimensional model of turbine blade, as figure 1 As shown, then use the Build Assembler layering software to slice the three-dimensional model of the turbine blade along the height direction to obtain slice data, and then import the slice data into the electron beam selection rapid prototyping equipment; each of the slice processes The thickness of the layer slice is 150 μm;

[0034] Step 2: Put the Ti-48Al-2Cr-2Nb alloy powder into the powder bin of the electron beam selective rapid prototyping equipment, and then vacuumize the forming cavity of the electron beam selective rapid prototyping equipment to a vacuum degree of 5×10 -2 Pa, the forming substrate in the forming cavity is preheated to 1000°C by electron beam; the Ti-48Al-2Cr-2Nb alloy powder is prepared by the gas atomization method, and the Ti-48Al obtained by the gas atomi...

Embodiment 2

[0043] Step 1. First, use Pro / Engineer software to build a three-dimensional model of the turbine blade, and then use the BuildAssembler layering software to slice the three-dimensional model of the turbine blade along the height direction to obtain slice data, and then import the slice data into the electron beam In the area-selected rapid prototyping equipment; the thickness of each layer of slices in the slicing process is 100 μm;

[0044] Step 2: Put the Ti-48Al-2Cr-2Nb alloy powder into the powder bin of the electron beam selective rapid prototyping equipment, and then vacuumize the forming chamber of the electron beam selective rapid prototyping equipment to a vacuum degree of 4.8×10 -2 Pa, using electron beams to preheat the forming substrate in the forming cavity to 1100°C; the TiAl alloy powder is prepared by the gas atomization method, and the TiAl alloy powder prepared by the gas atomization method is spherical and has a particle size smaller than 120 μm; the scanni...

Embodiment 3

[0051] Step 1. First, use the CAD 3D drawing software to establish a 3D model of the turbine blade, and then use the BuildAssembler layering software to slice the 3D model of the turbine blade along the height direction to obtain slice data, and then import the slice data into the electron beam In the area-selected rapid prototyping equipment; the thickness of each layer of slices in the slicing process is 50 μm;

[0052] Step 2: Put the Ti-48Al-2Cr-2Nb alloy powder into the powder chamber of the electron beam selective rapid prototyping equipment, and then vacuumize the forming chamber of the electron beam selective rapid prototyping equipment to a vacuum degree of 4.5×10 -2 Pa, the forming substrate in the forming cavity is preheated to 1050°C by electron beam; the TiAl alloy powder is prepared by the gas atomization method, and the TiAl alloy powder prepared by the gas atomization method is nearly spherical, with a particle size of less than 80 μm; the scanning speed of the...

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Abstract

The invention discloses a preparing method of a TiAl alloy turbine blade. The method comprises the steps that a three-dimensional model of the turbine blade is built, slicing treatment is carried out,and layer cutting data are obtained; secondly, secondly, a forming cavity of an electronic beam area selection rapid forming device is subject to vacuum pumping, and a forming substrate is preheated;thirdly, TiAl alloy powder is laid on the preheated forming substrate, and preheating is carried out; fourthly, the preheated TiAl alloy powder is subject to area selection melting scanning, and a single-layer solid piece layer is formed; fifthly, the third step and the fourth step are repeated, and an electronic beam area selection melting forming part is formed; sixthly, after cooling, the TiAlalloy turbine blade is obtained. The TiAl alloy turbine blade is prepared through the electronic beam area selecting rapid forming method, preheating of the forming substrate and the TiAl alloy powder is achieved, forming temperature of the TiAl alloy turbine blade is controlled, internal heat stress of the TiAl alloy turbine blade is reduced, deforming and breaking of the TiAl alloy turbine blade are avoided, and matching of strength and plasticity of the TiAl alloy turbine blade is enhanced.

Description

technical field [0001] The invention belongs to the technical field of turbine blade preparation, and in particular relates to a method for preparing a TiAl alloy turbine blade. Background technique [0002] The density of TiAl alloy is only 3.8g / cm 3 ~4.0g / cm 3 , is 1 / 2 of nickel-based superalloys, and 10% to 15% lower than titanium alloys. The elastic modulus of TiAl alloy at room temperature is 160GPa-170GPa, which is 33% higher than that of titanium alloy, and its elastic modulus can still be maintained at 150GPa at 750°C, which is equivalent to that of GH4169 superalloy. TiAl alloy also has high specific strength, and its specific strength can still maintain 80% of the specific strength at room temperature at 750°C. In addition, TiAl alloy also has high creep resistance, excellent oxidation resistance and flame retardancy, and can work for a long time under the condition of 760 ° C ~ 800 ° C. It is a light-weight high-temperature structural material with great develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F5/04B33Y10/00
CPCB22F5/04B33Y10/00B22F2999/00B22F10/00B22F10/28B22F10/36B22F10/362B22F10/32B22F2201/20Y02P10/25
Inventor 刘楠杨坤王建杨广宇贾亮
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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