Method for refined and directional solidification of titanium aluminium alloy slab surface structure

A technology of titanium-aluminum alloy and directional solidification, which is applied in the field of processing the surface structure of titanium-aluminum alloy slabs, can solve the problems that the directionally solidified columnar grain structure and equiaxed fine-grain composite structure cannot be formed, and avoid loose mixed oxidation The effect of film, meeting the requirements of high temperature creep and high temperature fatigue performance

Active Publication Date: 2012-03-28
HARBIN INST OF TECH
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Problems solved by technology

[0007] The present invention will solve the problem that the existing heat treatment method makes the surface of titanium-aluminum alloy form easily peeled loose TiO 2 and Al 2 o 3 The mixed oxide film cannot form the technical problem of directionally solidified columnar grain structure and equiaxed fine grain composite structure, and provides a method for refining the surface structure of directionally solidified titanium-aluminum alloy slab

Method used

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  • Method for refined and directional solidification of titanium aluminium alloy slab surface structure
  • Method for refined and directional solidification of titanium aluminium alloy slab surface structure
  • Method for refined and directional solidification of titanium aluminium alloy slab surface structure

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specific Embodiment approach 1

[0011] Specific Embodiment 1: A method for refining the surface structure of the directionally solidified titanium-aluminum alloy slab in this embodiment is carried out according to the following steps: 1. Test the temperature A at which the directionally solidified titanium-aluminum alloy slab transforms from the γ phase to the α phase ; 2. At room temperature, the titanium-aluminum alloy slab is subjected to surface plastic deformation by ball rolling, and the reduction is 0.1mm to 0.2mm; 3. The titanium-aluminum alloy slab sample after surface plastic deformation is placed in the Seal the quartz tube and evacuate the quartz tube to 1×10 -4 Pa~1×10 -3 Pa; 4. Put the quartz tube in step 3 in a heating furnace and heat it to a temperature 10°C to 20°C higher than temperature A and keep it for 10min to 20min, then take out the aluminum alloy slab from the quartz tube and put it into a temperature of 10°C Quenching in water at ~25°C to obtain a directionally solidified titanium...

specific Embodiment approach 2

[0014] Embodiment 2: This embodiment differs from Embodiment 1 in that: the reduction amount of the surface plastic deformation in step 2 is 0.12mm-0.18mm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0015] Embodiment 3: This embodiment is different from Embodiment 1 in that: the reduction amount of the surface plastic deformation in step 2 is 0.15 mm. Others are the same as in the first embodiment.

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Abstract

A method for refined and directional solidification of titanium aluminium alloy slab surface structure relates to a processing method for titanium aluminium alloy slab surface structure. The method of the present invention solves the problems that a flaky and loose TiO2 and Al2O3 mixed oxide film is formed on titanium aluminium alloy surface in the prior thermal treatment method, and that compound structure of directionally solidified columnar crystal structure and equiaxial fine grains can not be formed. The method comprises the following steps of: testing a temperature A achieved by transforming the directionally solidified titanium alloy slab from [gamma] phase to [alpha] phase; after being subjected to surface plastic deformation, sealing the titanium aluminium alloy slab into a quartz tube; after vacuuming the quartz tube, heating the quartz tube to a temperature 10-20 EDG C higher than the temperature A and maintaining the temperature for 10min to 20min; and quenching to obtain a directionally solidified titanium aluminium alloy slab with refined surface structure, wherein the surface layer of the titanium alloy slab is a fine grain layer, and the structure at the centre part is maintained in a state of directionally solidified columnar crystal structure. The method can be used for manufacturing blades of aircraft engines.

Description

technical field [0001] The invention relates to a treatment method for the surface structure of a titanium-aluminum alloy slab. Background technique [0002] Modern military aircraft have higher and higher requirements on the thrust-to-weight ratio of the engine, and the performance of the engine mainly depends on the performance of the blades. Most of the materials used for engine blades are titanium-aluminum alloys. The original structure of directionally solidified titanium-aluminum alloys is columnar grains, and the columnar grains have a preferred orientation of growing along the length of the blank. The longitudinal section microstructure of columnar grains is full lamellar structure, the grain size is about 300 μm to 500 μm, and the growth direction of the lamellar sheets in each grain is inconsistent. For directionally solidified titanium-aluminum alloy blade blanks, if the composite structure with equiaxed fine grains on the surface and oriented coarse columnar gra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
Inventor 单德彬任涛林徐文臣
Owner HARBIN INST OF TECH
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