Heat treatment method of TC25 alloy forge piece

A heat treatment method and technology for forgings, applied in the field of heat treatment of TC25 alloy forgings, can solve problems such as elongation, unqualified surface shrinkage, and unqualified strength of double-state structure forgings, so as to achieve improved strength properties, reduced plastic properties, and reduced thickness Effect

Inactive Publication Date: 2021-04-27
SHAANXI HONGYUAN AVIATION FORGING
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Problems solved by technology

Through testing and trial production, it is found that forgings with basket structure are prone to unqualified elongation and shrinkage, and forgings with two-state structure are prone to unqualified strength

Method used

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  • Heat treatment method of TC25 alloy forge piece
  • Heat treatment method of TC25 alloy forge piece

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Embodiment Construction

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] The heat treatment method of the TC25 alloy forging provided by the invention comprises:

[0025] Step 1: Annealing once

[0026] Heat the forged TC25 alloy forging to 30°C-40°C below the β transformation point, keep it warm for 1-4h, and air-cool or air-cool the forging after it comes out of the furnace.

[0027] Among them, the heating temperature o...

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Abstract

The invention belongs to the technical field of metal heat treatment, and discloses a heat treatment method of a TC25 alloy forge piece. The method comprises the following steps of 1, heating the alloy forge piece to 30-40 DEG C below the beta phase transformation point, keeping the temperature for 1-4 hours, discharging, transferring and dispersing the forge piece within 120 seconds, and carrying out air cooling or air cooling; and 2, heating the alloy forge piece cooled to the room temperature in the step 1 to 540 DEG C, keeping the temperature for 6 h, and performing air cooling. According to the method, by referring to the structure evolution rule of the TC25 alloy in the heat treatment process, the heat treatment systems of different structure states are fully considered, and the original beta grain size and secondary alpha phase sheet layer bundling are adjusted, so that the strength of the forged piece is improved, and the plasticity is improved.

Description

technical field [0001] The invention belongs to the technical field of metal heat treatment, in particular to a heat treatment method for a TC25 alloy forging. Background technique [0002] TC25 alloy is a martensitic α+β type titanium alloy, which is suitable for working at 500-550°C for a long time, and is an ideal heat-strength titanium alloy for engines. [0003] At present, there are normatively determined TC25 heat treatment process parameters as follows: primary annealing: β t Insulate at -40°C for 1-4h, air cooling; secondary annealing: hold at 540°C for 6h, air cool. Organizational requirements: Basket interwoven lamellar organization or uniform equiaxed organization, tensile strength ≥ 980MPa, elongation ≥ 7%, section reduction ≥ 15%. In the production, the net basket structure uses the β single-phase zone forging technology, and the two-state structure uses the two-phase zone forging technology. Through testing and trial production, it is found that forgings wi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
CPCC22F1/183
Inventor 吴娇洁谭海波崔明磊孙向波
Owner SHAANXI HONGYUAN AVIATION FORGING
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