Process for removing alpha layer of titanium alloy of aero-engine blower internal cartridge receiver unit

An aero-engine and titanium alloy technology is applied in the field of removing the titanium alloy α layer of the inner casing unit of the aero-engine fan. and other problems, to achieve the effect of low production cost, avoiding over-corrosion and broad application prospects

Active Publication Date: 2018-02-27
AECC AERO SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the removal of the α layer on the surface of domestic titanium alloy parts, especially special-shaped and complex parts, is not suitable for the removal process of the titanium alloy α layer commonly used in ordinary titanium alloy plates, that is, the removal of the α layer on the surface of titanium alloys by sandblasting or mechanical processing, such as The casing unit in the aero-engine fan is large in size and complex in shape. There are certain deep cavities inside the casing and the support plate, and the cavities are complex and numerous, and it is impossible to completely remove the titanium alloy α layer.
Therefore, titanium alloy parts generally adopt a two-step method, that is, first molten alkali cleaning and then pickling, but due to the high temperature of molten alkaline cleaning process, up to 450 ° C, and it is easy to cause premature aging of α + β phase and β phase titanium alloy parts Strengthening, making further processing difficult

Method used

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  • Process for removing alpha layer of titanium alloy of aero-engine blower internal cartridge receiver unit
  • Process for removing alpha layer of titanium alloy of aero-engine blower internal cartridge receiver unit
  • Process for removing alpha layer of titanium alloy of aero-engine blower internal cartridge receiver unit

Examples

Experimental program
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Effect test

Embodiment 1

[0033] It is calculated that the thickness of the alpha layer of the sample with the same material as the casing unit of the aero-engine fan and heat treatment in the same state is 18 microns, and the metallographic photos are as follows figure 2 shown.

[0034] (1) Alkaline cleaning oil stains: immerse the casing unit of the aero-engine fan in an alkaline washing solution and shake and wash at 30°C for 15 minutes to remove oil stains on the workpiece surface. The alkaline washing solution is Biogenic SE374 produced by RMC The volume concentration of the industrial cleaning agent prepared with water is 12vol% alkaline lotion;

[0035] (2) Clean the alkaline lotion: remove the casing unit of the aero-engine fan from the alkaline lotion, drain the alkaline lotion in the inner cavity of the casing, immerse it in clean water through the hanging device and shake it for 2 minutes to clean the surface of the workpiece. alkaline washing solution;

[0036] (3) Determine the pickling...

Embodiment 2

[0042] It is calculated that the thickness of the α layer of the sample with the same material as the casing unit in the fan of the aero-engine and heat-treated in the same state is 16 microns, and the metallographic photos are as follows image 3 shown.

[0043] (1) Alkali cleaning oil stains: immerse the casing unit of the aero-engine fan in an alkaline washing liquid and shake it at 35°C for 10 minutes to remove the oil stains on the surface of the workpiece. The alkaline washing liquid is Biogenic SE374 produced by RMC The volume concentration of the industrial cleaning agent prepared with water is 25vol% alkaline lotion;

[0044] (2) Clean the alkaline lotion: remove the casing unit of the aero-engine fan from the alkaline lotion, drain the alkaline lotion in the inner cavity of the casing, immerse it in clean water through the hanging device and shake it for 5 minutes to clean the surface of the workpiece. alkaline washing solution;

[0045] (3) Determine the pickling ra...

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Abstract

The invention provides a process for removing an alpha layer of a titanium alloy of an aero-engine blower internal cartridge receiver unit. The main content is that the aero-engine blower internal cartridge receiver unit is immersed in an alkali washing solution for alkali washing at 30-35 DEG C; after alkali washing, the alkali washing solution is washed through water; then the aero-engine blowerinternal cartridge receiver unit is put in a pickling solution for pickling at 15-35 DEG C; after pickling, the pickling solution is washed through water; and then the aero-engine blower internal cartridge receiver unit is blow-dried through compressed air. The process is easy and convenient to operate, simple in equipment and low in production cost, over etching is avoided, and after the alpha layer is removed, the hydrogen content in the titanium alloy can meet the related standard requirements.

Description

technical field [0001] The invention relates to the technical field of processing titanium alloy components of aero-engines, in particular to a process for removing an α-layer of a titanium alloy in a casing unit of an aero-engine fan. Background technique [0002] Titanium alloy has the advantages of high specific strength and excellent corrosion resistance, and is widely used in aerospace and other fields. The inner casing unit of the aero-engine fan is composed of a titanium alloy inner casing and 12 titanium alloy support plates through electron beam welding. Usually, welding stress will be generated during the welding process, which will affect the performance of the welded inner casing unit. Therefore, heat treatment is usually required to eliminate welding stress after welding. [0003] At present, vacuum furnaces are generally used for heat treatment of titanium alloy parts, and the anti-oxidation effect is good. However, when the vacuum degree of vacuum furnace hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/20C23G1/10
CPCC23G1/106C23G1/205
Inventor 田敏黎红英王莉张萍
Owner AECC AERO SCI & TECH CO LTD
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