A Cast Titanium Alloy Suitable for 560~650℃

A technology of casting titanium alloys and allowances, which is applied in the field of titanium alloys, can solve the problems of strength-plastic mismatch and poor casting performance, reduce the tendency of cracks, improve high-temperature strength and high-temperature creep properties, and reduce the number and size of cracks Effect

Active Publication Date: 2018-10-16
重庆两航金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] Aiming at the problems of poor casting performance and mismatch of strength and plasticity in the above background, the present invention provides a casting with excellent casting performance and small cracking tendency, which can be used for a long time at 550°C, and can be used for a short time at 600-650°C. Cast high-temperature titanium alloy with variable resistance and thermal stability that can meet the requirements of use

Method used

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  • A Cast Titanium Alloy Suitable for 560~650℃
  • A Cast Titanium Alloy Suitable for 560~650℃
  • A Cast Titanium Alloy Suitable for 560~650℃

Examples

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Embodiment 1

[0029] This embodiment is a cast high-temperature titanium alloy, including 86.5% Ti, 5.81% Al, 2.15% Sn, 3.46% Zr, 0.46% Mo, 0.65% Nb, 0.18% Si and 0.53% Ta, the balance is impurity, and described percentage is mass percent.

[0030] A cold crucible suspension melting furnace was used to cast the test bar sample, and the obtained cast cylindrical test bar had a diameter of 14.5 mm and a length of 180 mm. The cast test bar was subjected to hot isostatic pressing at 920°C / 130MPa / 2h to remove internal defects of the casting.

[0031] The test bar after hot isostatic pressing is subjected to solid solution + aging treatment. The heat treatment process is 1030°C / 2h / AC+700 / 2h / AC. The tensile standard sample size and sample tensile test method are in accordance with GB / T228- 2010 for implementation. The tensile properties of test bars at different temperatures are shown in Table 2, where σ b is the tensile strength, σ 0.2 is the yield strength, and δ is the elongation.

Embodiment 2

[0033] This embodiment is a cast high-temperature titanium alloy, including 86.3% Ti, 5.89% Al, 1.8% Sn, 3.47% Zr, 0.81% Mo, 0.63% Nb, 0.16% Si, 0.48% Ta and 0.06% of C, the balance is impurities, and the stated percentages are mass percentages.

[0034] The preparation method, hot isostatic pressing and heat treatment process of the test bar in this example are the same as those disclosed in Example 1, and Table 2 shows the tensile properties of the test bar at different temperatures.

Embodiment 3

[0036] This embodiment is a cast high-temperature titanium alloy, including 86.1% Ti, 5.7% Al, 2.3% Sn, 3.4% Zr, 0.9% Mo, 0.5% Nb, 0.12% Si, 0.7% Ta, the balance is impurity, and described percentage is mass percent. Use the cold crucible suspension smelting furnace to pour the cracked cup sample, conduct the penetration test analysis on the poured cracked sample, and compare the number and size of the cracks produced. The results are shown in Table 2. figure 1 A schematic diagram of the crack after coloring the cracked cup is given.

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Abstract

The invention provides a cast titanium alloy applicable to 560 DEG C-650 DEG C. The cast titanium alloy comprises Ti, Al, Sn, Zr, Mo, Nb, Si, Ta and / or C, and the balance impurities. The cast titanium alloy is based on a Ti-Al-Sn-Zr-Mo-Si system basis, the content of Sn element reducing a casting property is controlled strictly, meanwhile, the content of all the elements is adjusted, and a small quantity of Nb, Ta and C elements are added properly. The cast titanium alloy is excellent in casting property, little in cracking tendency, capable of being used for a long time at 550 DEG C, and capable of serving for a short time at 600 DEG C-650 DEG C, and the creep resistance and the heat stability of the cast high-temperature titanium alloy can meet the use requirement at a high temperature.

Description

technical field [0001] The invention belongs to the technical field of titanium alloys, and in particular relates to a cast high-temperature titanium alloy for short-term service at 560-650°C. Background technique [0002] Due to its low density, high strength, corrosion resistance, and high temperature resistance, titanium alloys have been widely used in the aerospace field, especially as aeroengine materials. High-temperature titanium alloys are developed to increase the thrust-to-weight ratio of aero-engines, including traditional high-temperature titanium alloys with solid solution strengthening as the main strengthening method and Ti-Al intermetallic compounds with orderly strengthening. The former can be divided into two categories : α+β type and near α type. α+β high-temperature titanium alloys can be used at temperatures up to about 500°C. They are characterized by a high content of β-stable elements and a large content of β-phase at room temperature. Most of them c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22F1/18
CPCC22C14/00C22F1/183
Inventor 寇宏超黄婷婷孙智刚王军唐斌李金山
Owner 重庆两航金属材料有限公司
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