Repeated Annealing Spheroidization Method for Flaky α in Mixed Microstructure of Near-α Titanium Alloy

A titanium alloy and tissue technology, applied in the field of heat treatment of materials, can solve problems such as high cost and complicated process

Active Publication Date: 2015-10-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the complex process, high cost and inapplicability of formed components in the deformation and spheroidization technology of the flaky α two-phase region of the near-α titanium alloy, and the high and low temperature cycle heat treatment method is not suitable for the formation of the flaky α in the mixed structure of the near-α titanium alloy. Insufficient spheroidization, the present invention proposes a repeated annealing spheroidization method of flaky α in the mixed structure of near α titanium alloy

Method used

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  • Repeated Annealing Spheroidization Method for Flaky α in Mixed Microstructure of Near-α Titanium Alloy
  • Repeated Annealing Spheroidization Method for Flaky α in Mixed Microstructure of Near-α Titanium Alloy
  • Repeated Annealing Spheroidization Method for Flaky α in Mixed Microstructure of Near-α Titanium Alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Heat the resistance furnace to 940°C, and put the mixed structure TA15 titanium alloy sample with a size of Φ10×15mm into the resistance furnace for heat preservation. The holding time is 15min+0.5min / mm×D, where D is the minimum dimension of the sample. In this embodiment, the minimum external dimension of the sample is D=10mm, so the holding time is 20min. After the heat preservation is over, the sample is taken out and air-cooled to complete the first annealing process.

[0016] Heat the resistance furnace to 940°C, put the mixed structure TA15 titanium alloy sample that has been annealed for the first time into the resistance furnace, keep it warm for 20 minutes, take out the sample and air-cool it, and complete the second annealing process.

[0017] The above annealing process is repeated, and the third annealing to the fifth annealing are performed sequentially. Repeat the above annealing process, the equiaxed α content in the TA15 titanium alloy after 5 times o...

Embodiment 2

[0019] Heat the resistance furnace to 950°C, and put the mixed structure TA11 titanium alloy sample with a size of Φ20×30mm into the resistance furnace for heat preservation. The holding time is 15min+0.5min / mm×D, where D is the minimum dimension of the sample. In this embodiment, the minimum external dimension of the sample is D=20mm, so the holding time is 25min. After the heat preservation is over, the sample is taken out and air-cooled to complete the first annealing process.

[0020] Heat the resistance furnace to 950°C, put the mixed structure TA11 titanium alloy sample that has been annealed for the first time into the resistance furnace, keep it warm for 25 minutes, take out the sample and air-cool it, and complete the second annealing process.

[0021] Repeat the above annealing process, and perform the third and fourth annealing in sequence. After 4 times of annealing, the equiaxed α content in the TA11 titanium alloy changed from 10% to 25%, and the equiaxed α con...

Embodiment 3

[0023] Heat the resistance furnace to 940°C, and put a mixed structure TA15 titanium alloy sample with a size of 55mm×55mm×12mm into the resistance furnace to keep it warm. The holding time is 15min+0.5min / mm×D, where D is the minimum dimension of the sample. In this embodiment, the minimum external dimension of the sample is D=12mm, so the holding time is 21 minutes. After the heat preservation is over, the sample is taken out and air-cooled to complete an annealing process.

[0024] Heat the resistance furnace to 940°C, put the mixed structure TA15 titanium alloy sample that has been annealed for the first time into the resistance furnace, keep it warm for 21 minutes, take out the sample and cool it in air, and complete the second annealing process. The equiaxed α content in TA15 titanium alloy changed from 10% to 15%, and the equiaxed α content increased by 5%. Figure 4 shown.

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Abstract

The invention discloses a repeated annealing and spheroidizing method of flake alpha in a similar alpha titanium alloy hybrid structure. The method comprises the following steps: heating a resistance furnace to 50-60 DEG C below a phase transformation point of titanium alloy; putting near alpha titanium alloy sample with a hybrid structure into the resistance furnace to carry out high-temperature annealing heat-preservation treatment, wherein the heat preservation time is 15+ / -0.5min / mm*D, and D is the minimal boundary dimension of the sample; taking out the sample to cool in air after heat preservation is ended; finishing annealing for the first time; and repeating the annealing process for 2-5 times, so that the equiaxial alpha content is increased to 5-20%. The defects that the flake alpha two-phase area deformation spheroidizing technology of the near alpha titanium alloy is complicated in process and high in cost are overcome by repeated annealing, and the method is applicable to a formed member and a flake alpha spheroidizing member in the near alpha titanium alloy hybrid structure.

Description

technical field [0001] The invention relates to a material heat treatment method, in particular to a lamellar α repeated annealing spheroidization method in a near α titanium alloy mixed structure. Background technique [0002] Near-α titanium alloys (such as TA15) have good thermal strength and weldability of α-type titanium alloys and process plasticity close to α+β-type titanium alloys, and are usually used in key load-bearing structural parts in aviation, aerospace and other fields . The stable microstructure of near-α titanium alloy components at room temperature is mainly composed of equiaxed α, β 转 One or several components of tissue and flaky α, its mechanical properties are mainly determined by the content and shape of equiaxed α and flaky α. The plasticity and fatigue strength of titanium alloys depend on the equiaxed α in the structure, while the fracture toughness and high temperature creep properties are related to the lamellar α. It is found that the nearly α...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
Inventor 孙志超张珏杨合郑立爽韩飞孝
Owner NORTHWESTERN POLYTECHNICAL UNIV
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