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
CN107931609BActive Publication Date: 2020-06-05NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
Publication Date
2020-06-05

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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.
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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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