Method for preparing seamless titanium alloy tube for aircraft engine

An aircraft engine and seamless titanium alloy technology, which is applied in the field of preparation of seamless titanium alloy pipes for aircraft engines, can solve the problems of insufficient deformation, low plasticity of pipes, easy cracking during flaring and flattening, and the like. Improve the process plasticity, prolong the heating time, and eliminate the effect of residual stress

Inactive Publication Date: 2011-01-05
WESTERN TITANIUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But so far, the main production units of titanium processing in my country have not been able to produce titanium alloy pipes that meet the requirements of aircraft engines.
The main problem is that the mechanical properties of the pipe are unstable and the process performance (flattening and flaring) cannot meet the corresponding requirements, and the yield is too low
The unstable mechanical properties of the pipe are mainly manifested in the large deviation of the material composition and the lack of a clear range of various impurity components; the material processing technology is not solidified, the deformation cannot meet the requirements, and the microstructure of the material is not fully refined; High, broken microstructure after cold working, coarsened after heat treatment
The above three reasons cause the mechanical properties (tensile strength) of titanium alloy pipes to fail to meet the requirements, and the microstructure is coarse, which makes the pipes low in plasticity, easy to crack when flaring and flattening

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 Preparation of seamless titanium alloy pipes for aircraft engines with specifications of Φ12.0×1.25mm (diameter 12.0mm, wall thickness 1.25mm)

[0032] 1) Ingot melting and forging into bars

[0033] According to GB / T 2524-2002, zero-grade or grade-1 sponge titanium is selected as raw material, and the raw material is re-inspected, and the raw material with impurity content less than 0.4% (mass fraction) is screened, and discoloration (yellowish or discolored) is manually screened out. Blue) titanium sponge.

[0034] Dry the titanium sponge before pressing the electrode block: dry at 100°C for 10 hours, press the titanium sponge into an electrode block after drying, and weld and melt the electrode block after pressing to ensure that the electrode block does not absorb moisture in the air before smelting;

[0035] Vacuum consumable electric arc furnace is used as the smelting equipment for the ingot. The diameter of the copper crucible is 560mm for the first s...

Embodiment 2

[0052] Example 2 Preparation of seamless titanium alloy pipes for aircraft engines with specifications of Φ10×1mm

[0053] 1) Ingot melting and forging into bars

[0054] According to GB / T 2524-2002, zero-grade or grade-1 sponge titanium is selected as raw material, and the raw material is re-inspected, and the raw material with impurity content less than 0.4% (mass fraction) is screened, and discoloration (yellowish or discolored) is manually screened out. Blue) titanium sponge.

[0055] Dry the sponge titanium ingot raw material before pressing the electrode block: dry at 120°C for 6 hours, and then press the ingot with the electrode block after drying. After the pressing is completed, the electrode block is welded and smelted in time to ensure that the electrode block does not absorb before smelting moisture in the air;

[0056] Vacuum consumable electric arc furnace is used as the smelting equipment for the ingot. The diameter of the copper crucible is 560mm for the firs...

Embodiment 3

[0074] Example 3 Preparation of seamless titanium alloy pipes for aircraft engines with specifications of Φ8×1.25mm

[0075] 1) Ingot melting and forging into bars

[0076] According to GB / T 2524-2002, zero-grade or grade-1 sponge titanium is selected as raw material, and the raw material is re-inspected, and the raw material with impurity content less than 0.4% (mass fraction) is screened, and discoloration (yellowish or discolored) is manually screened out. Blue) titanium sponge.

[0077] Dry the sponge titanium ingot raw material before pressing the electrode block: dry at 105°C for 8 hours, and then press the ingot with the electrode block after drying. After the pressing is completed, the electrode block is welded and smelted in time to ensure that the electrode block does not absorb before smelting moisture in the air;

[0078] Vacuum consumable electric arc furnace is used as the ingot melting equipment. The copper crucible with a diameter of 560 mm is used for the fi...

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Abstract

The invention discloses a method for preparing a seamless titanium alloy tube for an aircraft engine. The seamless titanium alloy tube for the aircraft engine which meets corresponding requirements is manufactured by improving the technological plasticity of the titanium alloy tube material. The method comprises the following steps of: firstly, smelting a spongy cast ingot to introduce interstitial elements as little as possible; secondly, cogging and forging heated cast ingot at large deformation and repeatedly upsetting and stretching the cast ingot to ensure that as-cast coarse grains are completely crushed and thinned, thermally processing formed tube billet under vacuum to eliminate residual stress produced during tube billet extrusion so as to improve the plasticity of the tube billet; thirdly, cogging and rolling the tube billet at large deformation and further thinning the grains; and finally, annealing at a low temperature after cold rolling of intermediate rolling and finished product rolling to effectively control the coarsening of the grains. Therefore, full recrystallization can be ensured by prolonging the heating time, and mechanical property and processing property required by material consumption of the aircraft engine can be met under the condition that the tube structure is fully recrystallized.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal material processing, and in particular relates to a method for preparing a seamless titanium alloy pipe for an aircraft engine. Background technique [0002] With the vigorous development of my country's aviation industry and the start of the national large aircraft project, the demand for small-sized titanium and titanium alloy pipes used in aircraft engine piping systems, such as TA1, TA2, TA18 and other small-sized titanium alloy pipes, will increase significantly . This type of titanium alloy pipe has the advantages of light weight, high specific strength, good corrosion resistance, non-magnetism, good forming process, and small linear expansion coefficient. It is often used as hydraulic and fuel piping systems in aerospace and civil aircraft. . Using this type of titanium alloy pipe to replace the stainless steel aviation conduit can reduce the weight of the aircraft pipeline by ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/06
Inventor 庞继明曲恒磊邓超南莉祝建雯李明利文宁杨亚社杨建朝
Owner WESTERN TITANIUM TECH
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