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A kind of nearly α-type titanium alloy and its preparation method

A forming method and titanium alloy technology, applied in the field of titanium alloy processing, can solve the problems of high cost, long process and only elongation, and achieve the effects of low cost, simple process and excellent performance

Active Publication Date: 2019-10-01
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the billet is obtained by smelting in a vacuum electric arc furnace, and then the powder is prepared by a plasma rotating electrode. After hot isostatic pressing, it is forged at isothermal temperature and finally heat treated. The whole process is long and expensive. rate is only 7.8%

Method used

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  • A kind of nearly α-type titanium alloy and its preparation method
  • A kind of nearly α-type titanium alloy and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing and forming a near-alpha-type titanium alloy is carried out in the following steps:

[0032] Step 1: powder metallurgy billet

[0033] Weigh the raw material powder according to the composition and mass percentage of near α-type titanium alloy. The specific composition and mass percentage are: 5.0% for Al, 2.0% for Sn, 3.5% for Zr, 0.3% for Mo, and 0.4% for Si. Y is 0.1%, and the balance is Ti;

[0034] Put the raw material powder with a particle size of 300 mesh into the mixing tank, place the mixing tank in the powder mixing machine and mix the powder for 8 hours to obtain the mixed powder, put the mixed powder into the rubber sheath and cold isostatic press molding, the molding pressure 150MPa, holding time 300s, to obtain the blank formed by cold isostatic pressing;

[0035] Put the billet formed by cold isostatic pressing into a vacuum sintering furnace for sintering, raise the temperature to 1100°C for 2 hours, and cool down with the furna...

Embodiment 2

[0042] A method for preparing and forming a near-alpha-type titanium alloy is carried out in the following steps:

[0043] Step 1: powder metallurgy billet

[0044] Weigh the raw material powder according to the composition and mass percentage of near-α-type titanium alloy. The specific composition and mass percentage are: 5.6% for Al, 2.2% for Sn, 3.5% for Zr, 0.4% for Mo, and 0.3% for Si. Y is 0.15%, and the balance is Ti;

[0045] Put the raw material powder with a particle size of 400 mesh into a mixing tank, place the mixing tank in a powder mixing machine, and mix the powder for 10 hours to obtain a mixed powder, put the mixed powder into a rubber sheath, and then cold isostatically press to form it. The pressure is 180MPa, and the holding time is 320s to obtain the blank formed by cold isostatic pressing;

[0046] Put the billet formed by cold isostatic pressing into a vacuum sintering furnace for sintering, raise the temperature to 1200°C for 3 hours, and cool down w...

Embodiment 3

[0053] A method for preparing and forming a near-alpha-type titanium alloy is carried out in the following steps:

[0054] Step 1: powder metallurgy billet

[0055] Weigh the raw material powder according to the composition and mass percentage of near-α-type titanium alloy. The specific composition and mass percentage are: 6.0% for Al, 2.3% for Sn, 4% for Zr, 0.5% for Mo, and 0.6% for Si. Y is 0.2%, and the balance is Ti;

[0056]Put the raw material powder with a particle size of 200 mesh into a mixing tank, place the mixing tank in a powder mixing machine, and mix the powder for 12 hours to obtain a mixed powder, put the mixed powder into a rubber sheath, and then cold isostatically press to form it. The pressure is 200MPa, and the holding time is 340s to obtain the blank formed by cold isostatic pressing;

[0057] Put the billet formed by cold isostatic pressing into a vacuum sintering furnace for sintering, raise the temperature to 1300°C for 3.5 hours, and cool with the...

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Abstract

A near-α-type titanium alloy and a preparation method thereof belong to the technical field of titanium alloy processing. The nearly α-type titanium alloy contains components and the mass percentage of each component: Al is 5.0-6.5%, Sn is 2.0-3.0%, Zr is 3.0-4.0%, Mo is 0.3-0.6%, and Si is 0.3%. ~0.6%, Y is 0.1~0.3%, and the balance is Ti. It is prepared by powder metallurgy billet, hot extrusion molding and subsequent vacuum annealing. Through the powder metallurgy process, segregation can be eliminated and the influence of uneven composition can be avoided. The obtained billet can be directly followed by molding without processing; combined with the hot extrusion process, the defect of low density of powder metallurgy can be eliminated, and at the same time, it can be formed at one time. The final shape of the product is directly extruded to reduce the amount of subsequent processing; the subsequent vacuum annealing process will improve the stability of the alloy. Finally, the application standard is reached.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy processing, and in particular relates to a near-α-type titanium alloy and a preparation method thereof. Background technique [0002] According to the current international development status, the development trend of high-temperature titanium alloys is: alloy design from less elements to more elements, alloying is becoming more and more reasonable, Ti-Al-Sn-Zr-Mo-Si series near α-type titanium alloys dominate, Near α-type titanium alloys have high strength, excellent creep properties and plasticity at high temperatures, and are mainly used as compressor discs and blades of advanced engines. Patent 201210374505.5 discloses a high-temperature titanium alloy and its preparation method. The alloy belongs to the Ti-Al-Sn-Zr-Mo-Si series near α-type titanium alloy. The method is casting after smelting in a water-cooled copper dry pot in a vacuum induction furnace, then performing billet forging...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C1/04C22F1/18C22F1/02
Inventor 李润霞丁超于宝义郑黎黄海滨
Owner SHENYANG POLYTECHNIC UNIV
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