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A high-strength titanium alloy for 500-600°C and its processing method

A titanium alloy, high-strength technology, applied in the new 500-600 ℃ high-strength titanium alloy and its processing field, can solve the problems of poor oxidation resistance, low creep and durability, and can not meet the requirements, and achieves plasticity and high-temperature oxidation resistance. The effect of improving the properties, improving the density and composition uniformity, and good strong-plastic matching

Active Publication Date: 2022-05-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional high-temperature titanium alloys that can be used at 550-600 °C for a long time are generally near α-type. This type of alloy has high high-temperature creep and durable resistance, but its strength at room temperature and medium temperature is poor, which affects the use of the alloy.
The α+β heat-strength titanium alloy has high strength at room temperature to medium temperature, but its oxidation resistance at 550-600°C is poor, and its creep and durability are low
Traditional solid-solution strengthening-based titanium alloy castings cannot meet the needs of modern aviation, aerospace and other industries

Method used

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  • A high-strength titanium alloy for 500-600°C and its processing method
  • A high-strength titanium alloy for 500-600°C and its processing method
  • A high-strength titanium alloy for 500-600°C and its processing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A material ingot with a diameter of 400mm was prepared by smelting method. The β transformation temperature of the alloy ingot was detected by metallographic method to be 990°C. The chemical composition of the ingot is listed in Table 2.

[0043] Alloy composition (mass percentage, wt.%) in the embodiment 1 of table 2

[0044]

[0045] Step 1): The alloy ingot is heated to 1150°C, kept warm for 24 hours, and then released from the furnace. The upsetting and elongation deformation is completed once on the hydraulic press. The forging ratio of upsetting and elongation is both 2. After forging, it is air cooled to complete the ingot homogenization treatment. Then the ingot was heated to 1015°C, and two times of upsetting and elongation deformation were carried out. Each fire completed one upsetting and one elongation. The forging ratio of upsetting and elongation was both 2. After forging, it was air-cooled to obtain of blanks.

[0046] Step 2): Heat the billet obtained...

Embodiment 2

[0052] A material ingot with a diameter of 380mm was prepared by smelting method. The β transformation temperature of the alloy ingot was detected by metallographic method to be 1000°C. The chemical composition of the ingot is listed in Table 4.

[0053] Table 4 Example 2 material alloy composition (mass percentage, wt.%)

[0054]

[0055] Step 1): The alloy ingot is heated to 1200°C, held for 48 hours, and released from the furnace. Upsetting and elongating deformation are completed on a hydraulic press with a forging ratio of 4. After forging, it is air-cooled to complete the homogenization of the ingot. Then the ingot was heated to 1045°C and 1025°C successively, and the upsetting and elongation deformation were carried out for one fire time respectively. One upsetting and one drawing were completed for each fire time. The forging ratio was 3.8. billet.

[0056] Step 2): Heat the billet obtained in step 1) to 960°C, carry out upsetting and elongating deformation on the ...

Embodiment 3

[0062] A material ingot with a diameter of 540mm was prepared by smelting method. The β transformation temperature of the alloy ingot was detected by metallographic method to be 1015°C. The chemical composition of the ingot is listed in Table 6.

[0063] Table 6 Example 3 material alloy composition (mass percentage, wt.%)

[0064]

[0065] Step 1): The alloy ingot is heated to 1200°C, held for 20 hours, and then released from the furnace. Upsetting and elongating deformation are completed on a hydraulic press. The forging ratio of each fire is 4. After forging, it is air-cooled to complete the homogenization of the ingot deal with. Then the ingot is heated to 1040°C, two upsetting and two drawing are completed, the total forging ratio of each firing is 3.8, and the forging is air-cooled to obtain the billet after blanking.

[0066] Step 2): Heat the billet obtained in step 1) to 985°C, carry out upsetting and elongating deformation on the hydraulic press for 3 times, and c...

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Abstract

The invention discloses a high-strength titanium alloy for 500-600°C and a processing method thereof, including elements such as alloy composition, preparation method, thermal deformation and heat treatment. Said alloy composition (percentage by weight), Al: 5.50% to 7.00%, Mo: 3.5% to 5.00%, Zr: 3.00% to 8.00%, Sn: 1.50% to 4.00%, W: 0.80% to 2.0%, Si: 0.2-1%, B: 0.5%-1.3%, O: ≤0.3%, and the balance is Ti and unavoidable impurity elements. The alloy material of the present invention can be obtained by smelting and powder metallurgy sintering, and then a forging product can be obtained through a combination of thermal deformation and heat treatment. The forging prepared by the above process has a two-state structure, TiB and silicide are evenly distributed in the matrix, and the material It has high strength and good plasticity in the range from room temperature to 600°C. It can be used to make key aerospace components and use it for a long time at 500-600°C. It can also be used for aerospace vehicles and other temperature-resistant structural parts at 600-650°C for short periods used when.

Description

technical field [0001] The invention belongs to the field of titanium alloy processing, and in particular relates to a novel high-strength titanium alloy for 500-600°C and a processing method thereof. Background technique [0002] Titanium alloys are widely used in aviation, aerospace and other fields because of their low density, high specific strength, good corrosion resistance and high temperature performance. The rapid development of modern science and technology has also put forward higher requirements for the high temperature performance of structural materials used in aviation and aerospace. Traditional high-temperature titanium alloys that can be used at 550-600 °C for a long time are generally near α-type. This type of alloy has high high-temperature creep and durable resistance, but its strength at room temperature and medium temperature is poor, which affects the use of the alloy. . The α+β heat-strength titanium alloy has high strength at room temperature to me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C1/03C22F1/18C22C1/05C22C1/10B21J1/06B21J5/00
CPCC22C14/00C22C1/03C22F1/183C22C1/05B21J5/002B21J1/06
Inventor 赵子博王清江刘建荣
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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