High-temperature titanium alloy

A technology of high-temperature titanium alloys and alloys, which is applied in the fields of high-temperature titanium alloy materials, high-temperature titanium alloys, and high-temperature structural parts, can solve the difficulty of increasing the uniformity control of ingot composition, and has not yet seen practical application reports, W element addition Difficulties and other problems, to achieve the effect of improving high temperature and high stress durability, improving oxidation resistance, and ensuring room temperature plasticity and toughness

Inactive Publication Date: 2015-04-29
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the melting point of W exceeds 3400°C and the density reaches 19.3g / cm3, it increases the difficulty of controlling the composition uniformity of the ingot. At the same time, the addition of W element is also very difficult. Improper process control will cause composition segregation, even in the ingot. There are incompletely melted W particles in the ingot, causing the entire ingot to be scrapped
Although most of the above-mentioned alloys are developed for high-temperature and short-term applications, there are no reports of practical applications.

Method used

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  • High-temperature titanium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0023] Using a vacuum consumable arc melting furnace, a 20kg ingot was prepared according to the ingredients given in Table 1, with an oxygen content of 0.08%, which was forged and rolled to obtain The rods, the tensile and durability properties of the rods were tested after heat treatment, as shown in Table 2, it can be seen that high Al equivalent has a significant effect on improving tensile strength; high Mo content is beneficial to improving high temperature durability; high Nb content is beneficial to improving The plasticity at room temperature is beneficial; increasing the C content is beneficial to improving the durability, but reducing the elongation at room temperature.

[0024] Table 1 Design ingredients of 20kg ingot

[0025] serial number

Ingredients

Al equivalent, %

1

Ti‐5.5Al‐3Sn‐4Zr‐1Hf‐3.5Mo‐3.5Nb‐0.4Si‐0.06C

7.97

2

Ti‐6.8Al‐2Sn‐4Zr‐0.04Hf‐2.5Mo‐2.5Nb‐0.4Si‐0.06C

8.94

3

Ti‐7.5Al‐2Sn‐4Zr‐0.04Hf‐1.5Mo‐2...

Embodiment 7～10

[0029] Using a non-consumable vacuum furnace, button ingots with 4 components were smelted, and the batching weight was 50g. Test pieces of 3×10×2mm were prepared respectively, and the oxidation weight gain after heat exposure at 650°C / 100h was compared, see Table 3 , with the increase of Hf content, the weight gain of oxidation decreases, and the addition of 0.03% Hf has shown the effect of improving the antioxidant performance.

[0030] Table 3 Effect of Hf content on the oxidation resistance of alloys

[0031] serial number

[0032] 10

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Abstract

The invention discloses high-temperature titanium alloy, which comprises the following chemical components in percentage by weight: 5.5%-7.5% of Al, 1.0%-3.0% of Sn, 3.0%-6.0% of Zr and Hf, 1.5%-3.5% of Mo, 1.5-%4.5% of Nb, 0.3%-0.6% of Si, 0.05%-0.20% of C and the balance of Ti. The equivalent range of the Al in the alloy is 7.97%-9.80%; control on the content of Al, Sn, Zr and O in the alloy can ensure that the equivalent range of the Al in the alloy is 7.97%-9.80%. According to the alloy disclosed by the invention, compound reinforcement is achieved by adding the elements such as Al, Sn, Mo, Zr, Hf, Si and C; the high-temperature tensile strength and the high-temperature large stress lasting strength of the alloy are improved; the room-temperature toughness and plasticity of the alloy are improved by adding a great amount of Nb elements; and the alloy is suitable for application at a high temperature over 650 DEG C from 30 minutes to 20 hours.

Description

technical field [0001] The invention relates to a high-temperature titanium alloy, which belongs to the field of titanium alloys, and relates to a high-temperature titanium alloy material with high Al equivalent for high-temperature and short-time applications, and is suitable for manufacturing high-temperature structural parts for short-term (30min-20h) applications above 650°C. Background technique [0002] Titanium alloy has the advantages of high specific strength, high specific modulus, good oxidation resistance and corrosion resistance, and is widely used in the manufacture of aircraft and engine structural parts. The amount of titanium alloy used in aircraft has also become an important indicator of its advanced level. one. With the improvement of aero-engine design requirements, high-temperature titanium alloys at 500°C to 600°C have been applied in aero-engines, and at the same time, the research and development of new high-temperature titanium alloy materials has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00
Inventor 曹京霞李娟黄旭周毅王宝
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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