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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 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

Method used

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

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specific Embodiment approach 1

[0007] Specific Embodiment 1: The preparation method of γ-TiAl alloy rods in this embodiment is carried out according to the following steps: 1. Place the γ-TiAl alloy ingot in a hot isostatic pressing furnace, Insulate in an argon atmosphere for 4 to 5 hours, then cool out of the furnace with the furnace, and then place it under the condition of 1250-1300 ° C for homogeneous annealing for 12 to 24 hours, and then cool it out of the furnace; 2. Cutting in the annealed γ-TiAl alloy ingot A cylinder of the required size is 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, and 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 sheathing blanks; 3. Put the sheathing blanks in acetone solution for 3-6 minutes, take out the sheathing blanks and dry them, and then pl...

specific Embodiment approach 2

[0012] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, the heat preservation is carried out in an argon atmosphere at 1260° C. and 135 MPa for 4.5 hours. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0013] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 is that in step 1, the heat preservation is carried out in an argon atmosphere at 1270° C. and 130 MPa for 4 hours. Other steps and parameters are the same as those in Embodiment 1.

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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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