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A heat-resistant titanium alloy and its processing and manufacturing method and application

A titanium alloy, hot working technology, applied in the field of titanium-based alloys, can solve the problems of affecting application, strength and toughness matching room temperature plasticity difference and so on

Active Publication Date: 2016-10-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] In short, the design temperature of mature high-temperature titanium alloys at home and abroad is 600°C. Although the 650°C titanium alloys developed by rapid metallurgy abroad have high strength, the matching of strength and toughness, especially room temperature plasticity, affects its application.
With the rapid development of aviation and aerospace technology, there is an urgent need for a new type of heat-resistant titanium alloy with a service temperature above 600 °C, static strength, creep and long-lasting strength, room temperature plasticity and thermal stability. This problem has not yet been resolved.

Method used

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  • A heat-resistant titanium alloy and its processing and manufacturing method and application
  • A heat-resistant titanium alloy and its processing and manufacturing method and application
  • A heat-resistant titanium alloy and its processing and manufacturing method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0081] The ingredients of Examples 1-6 are listed in Table 2. Alloy smelting to make Φ220mm ingot, 1 # ~5 # The measured phase transition points of the component alloys are all 1045±5°C, so the same temperature is used for thermal processing and heat treatment. 6 # The transformation point of the alloy is 1037°C. After cutting off the cap of the ingot and peeling off the surface scale, the following thermal processing processes are used to obtain Φ27mm rods: the first fire, 1180°C, hydraulic press forging, Φ220mm→Φ170mm; the second fire, 1080°C, hydraulic press forging, Φ170mm→ Φ120mm; the third fire, 1025℃, precision forging machine forging, Φ120mm→Φ80mm; the fourth fire, 1015℃, precision forging machine forging, Φ80mm→Φ50mm; the fifth fire, 1000℃, precision forging machine forging, Φ50mm→Φ27mm. After the grinding wheel is blanked, heat treatment is carried out, and then the samples are processed and mechanical properties are tested. The results are shown in Table 3 and T...

Embodiment 7～11

[0091] The measured components of Examples 7-11 are listed in Table 5. The alloy was smelted to produce a Φ220mm ingot, and the test results of the phase transition point are shown in Table 6. After cutting off the cap of the ingot and peeling off the surface scale, the Φ27mm bar is obtained by the following thermal processing process: the first fire, 1180°C, hydraulic press forging, Φ220mm→Φ170mm; the second fire, 1090°C, hydraulic press forging, Φ170mm→ Φ120mm; the third fire, 20℃ below the phase transition point in Table 6, precision forging machine forging, Φ120mm→Φ80mm; the fourth fire, 30℃ below the phase transition point in Table 6, precision forging machine forging, Φ80mm→Φ50mm; fifth Fire, 40°C at the phase transition point in Table 6, forged on a precision forging machine, Φ50mm→Φ27mm. After the grinding wheel is blanked, heat treatment is carried out, and then the samples are processed and the mechanical properties are tested. The results are shown in Tables 7-13. ...

Embodiment 12～15

[0114] The ingredients of Examples 12-15 are listed in Table 14. The alloy was smelted to produce a Φ220mm ingot, and the results of the phase transition point test are shown in Table 15. After cutting off the cap of the ingot and peeling off the surface scale, the following thermal processing processes are used to obtain Φ27mm rods: the first fire, 1180°C, hydraulic press forging, Φ220mm→Φ170mm; the second fire, 1080°C, hydraulic press forging, Φ170mm→ Φ120mm; the third fire, 10℃ below the phase transition point in Table 15, precision forging machine forging, Φ120mm→Φ80mm; the fourth fire, 20℃ below the phase transition point in Table 15, precision forging machine forging, Φ80mm→Φ50mm; fifth Fire, 35°C at the phase transition point in Table 15, forged with precision forging machine, Φ50mm→Φ27mm. After the grinding wheel is blanked, heat treatment is carried out, and then the sample is processed for mechanical performance testing. The results are shown in Tables 16-18.

[01...

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Abstract

The invention belongs to the field of titanium-based alloys, and specifically relates to a novel heat-resistant titanium alloy and its processing and manufacturing method and application, including components such as alloy composition, smelting, thermal processing and heat treatment. The composition (weight percentage) of said alloy is Al: 5.4%~6.3%; Sn: 3.0%~5.0%; Zr: 2.5%~6.4%, Mo: 0.0~0.96%, Si: 0.25%~0.5%, Nb : 0.2%~0.5%, Ta: 0.3%~3.4%, W: 0.2%~1.6%, C: 0.0~0.07%, O≤0.17%, Fe≤0.03%, the balance is Ti and unavoidable impurity elements . The alloy of the present invention can obtain different matchings of tensile strength and plasticity, durability and creep strength and thermal stability through different thermal processing and heat treatment process combinations, and can be used to make blades, discs and other parts of high-temperature parts of advanced aero-engines, It can be used for a long time in the range of 600-650°C; it can also be used to make high-temperature resistant structural parts such as aerospace vehicle skins, and it can be used for a short time at about 700°C; it can also be used as a material for high-temperature and corrosion-resistant valves for automobiles and boilers.

Description

technical field [0001] The invention belongs to the field of titanium-based alloys, and specifically relates to a new type of heat-resistant titanium alloy and its Manufacturing methods and applications. Background technique [0002] Titanium alloy has the advantages of high specific strength, corrosion resistance and heat resistance, so it is widely used in aviation, aerospace, petroleum, chemical industry, energy, automobile, medical treatment, sports and leisure and other fields. With the development of aviation and aerospace technology, especially when the flight Mach number of the aerospace vehicle reaches above 3.0, the traditional Al-based alloy and TC4 (Ti6Al-4V) titanium alloy can no longer meet the temperature resistance requirements of the aircraft shell, and there is an urgent need It is a light-weight, high-efficiency heat-resistant titanium alloy with a service temperature of 600°C to 700°C. In order to meet the forming of complex structural parts of aircraft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C1/03C22F1/18
Inventor 刘建荣王清江杨锐王磊陈志勇朱绍祥
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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