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A kind of preparation method of tial alloy turbine blade

A turbine blade and alloy technology, applied in turbines, mechanical equipment, additive manufacturing, etc., can solve the problems of reducing the comprehensive properties of TiAl alloys, the brittleness of TiAl alloys at room temperature, and restricting the application of TiAl alloys, achieving good interlayer bonding and avoiding deformation. and fracture phenomenon, the effect of reducing internal thermal stress

Active Publication Date: 2020-06-05
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of preparation method of tial alloy turbine blade
  • A kind of preparation method of tial alloy turbine blade
  • A kind of preparation method of tial alloy turbine blade

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Experimental program
Comparison scheme
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 method for preparing a TiAl alloy turbine blade. The method comprises: 1. establishing a three-dimensional model of the turbine blade, performing slicing processing, and obtaining sliced ​​layer data; , and then preheat the forming substrate; 3. lay the TiAl alloy powder on the preheated forming substrate, and then preheat; 4. perform selective melting scanning on the preheated TiAl alloy powder to form a single-layer solid sheet 5. Steps 3 and 4 are repeated to form electron beam selective melting moldings; 6. TiAl alloy turbine blades are obtained after cooling. The method adopts the electron beam selective area rapid prototyping method to prepare TiAl alloy turbine blades. By preheating the forming substrate and TiAl alloy powder, the forming temperature of TiAl alloy turbine blades is controlled, which reduces the internal thermal stress of TiAl alloy turbine blades and avoids the The deformation and fracture of alloy turbine blades enhance the matching of strength and plasticity of TiAl alloy turbine blades.

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 Patents(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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