Production method for Gamma-TiAl alloy bar

A technology for alloy bars and alloy ingots, which is applied in the field of alloy bar preparation, can solve the problems of uneven bar structure and grain size, bar surface cracking, uneven diameter and thickness, and achieves uniform diameter and thickness and improves strength. , the effect of uniform grain size

Inactive Publication Date: 2009-09-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Production method for Gamma-TiAl alloy bar
  • Production method for Gamma-TiAl alloy bar

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0007] Specific embodiment 1: The preparation method of the γ-TiAl alloy bar of this embodiment is carried out according to the following steps: 1. Place the γ-TiAl alloy ingot in a hot isostatic pressing furnace at a temperature of 1250~1280℃, 130~140MPa After being kept in an argon atmosphere for 4 to 5 hours, the furnace is cooled and discharged, and then placed at 1250 to 1300 ℃ for homogenization annealing for 12 to 24 hours, and the furnace is cooled and discharged; 2. Cutting in the annealed γ-TiAl alloy ingot The cylinder of the required size is then wrapped with aluminum silicate fiber with a thickness of 2-7mm, and then placed in the middle of a stainless steel tube with a wall thickness of 2-7mm. The two ends of the stainless steel tube are covered with stainless steel plates with a thickness of 2-7mm. Carry out welding and sealing under argon atmosphere to obtain a jacket blank; 3. Place the jacket blank in an acetone solution and ultrasonically clean for 3-6 minutes, ...

Example Embodiment

[0012] Specific embodiment two: this embodiment is different from specific embodiment one in that in step one, the temperature is kept at 1260° C. and 135 MPa in an argon atmosphere for 4.5 hours. Other steps and parameters are the same as in the first embodiment.

Example Embodiment

[0013] Specific embodiment three: This embodiment is different from specific embodiment one in that in step one, the temperature is kept at 1270° C. and 130 MPa in an argon atmosphere for 4 hours. Other steps and parameters are the same as in the first embodiment.

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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 by 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 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 air 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.

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 ...

Claims

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Application Information

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IPC IPC(8): B21C23/08B21C23/01B21C31/00C21D1/26C10M103/00C10M103/02
Inventor 徐文臣单德彬张浩吕炎
Owner HARBIN INST OF TECH
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