Production method for Gamma-TiAl alloy bar

Abstract

The invention relates to a production method for a bar, in particular to a production method for a Gamma-TiAl alloy bar. The production method solves the problems that a Gamma-TiAl alloy bar produced The invention relates to a production method for a bar, in particular to a production method for a Gamma-TiAl alloy bar. The production method solves the problems that a Gamma-TiAl alloy bar producedbcooling, and obtaining the Gamma-TiAl alloy bar. The obtained bar has the advantages of no surface cracks, even diameter, even size of crystal grains and no fusion caused by the reaction of the Gammr cooling, and obtaining the Gamma-TiAl alloy bar. The obtained bar has the advantages of no surface cracks, even diameter, even size of crystal grains and no fusion caused by the reaction of the Gamma-TiAl alloy and the sheath.a-TiAl alloy and the sheath.y the prior method has the defects of surface cracks, uneven diameter, uneven size of crystal grains and easy fusion caused by the reaction of Gamma-TiAl alloy and blank at high extrusion temperatureby the prior method has the defects of surface cracks, uneven diameter, uneven size of crystal grains and easy fusion caused by the reaction of Gamma-TiAl alloy and blank at high extrusion temperature. The production method comprises the steps: heating a cast ingot, keeping temperature and annealing; cutting a cylinder in the cast ingot, packaging aluminum silicate fibers, placing in the middle of. The production method comprises the steps: heating a cast ingot, keeping temperature and annealing; cutting a cylinder in the cast ingot, packaging aluminum silicate fibers, placing in the middle ofa stainless steel pipe, and sealing both ends to obtain the blank; washing the sheathed blank, drying and heating the sheathed blank, keeping temperature, placing the sheathed blank in the air, putti a stainless steel pipe, and sealing both ends to obtain the blank; washing the sheathed blank, drying and heating the sheathed blank, keeping temperature, placing the sheathed blank in the air, putting the sheathed blank into a cup pre-pressured by glass lubricant, putting the sheathed blank into a mould to extrude to obtain the bar; annealing the bar, taking the bar out of a blast furnace for aing the sheathed blank into a cup pre-pressured by glass lubricant, putting the sheathed blank into a mould to extrude to obtain the bar; annealing the bar, taking the bar out of a blast furnace for air

Description

technical field [0001] The invention relates to a method for preparing alloy rods. Background technique [0002] γ-TiAl alloys have shown impressive development prospects in aerospace materials, but due to their high thermal strength and low thermoplasticity, the traditional sheathed extrusion process cannot be used smoothly. The hot extrusion of γ-TiAl has the following disadvantages: 1. The surface of the γ-TiAl alloy is oxidized during the heating process, and cracks are easily generated during the subsequent extrusion process, so that the surface of the final extruded bar is cracked; 2. The high-temperature strength difference between the stainless steel sheath material and the γ-TiAl alloy is large, resulting in uneven diameters of the extruded rods, and even the sheath breaks and damages the mold. 3. The extruded rod has a high temperature gradient from the center to the outer edge, resulting in uneven grain size of the extruded rod; 4. When the extrusion temperature ...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the cracks on the surface of the bar, uneven diameter, uneven grain size and uneven grain size of the bar structure in the γ-TiAl alloy bar prepared by the existing method, and the occurrence of γ-TiAl alloy and blank when the extrusion temperature is high. In order to solve the problem of melting due to reaction, a method for preparing γ-TiAl alloy rods is provided

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