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Thermal treatment method for TC18 titanium alloy

A TC18 and titanium alloy technology, applied in the field of heat treatment of metal materials, can solve the problems of low alloy strength and alloy plasticity and toughness, and achieve the effect of improving plasticity and toughness, increasing temperature and high strength

Active Publication Date: 2014-07-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a heat treatment process for TC18 titanium alloy. The TC18 titanium alloy processed by the present invention not only has higher strength, but also overcomes the low strength of the alloy in the traditional double annealing process and the difficulty in using the solid solution-aging process. Alloy Plasticity and Toughness Meet Application Requirements

Method used

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  • Thermal treatment method for TC18 titanium alloy
  • Thermal treatment method for TC18 titanium alloy
  • Thermal treatment method for TC18 titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The TC18 titanium alloy hot-forged bar with Φ120mm×150mm is used, and its microstructure is composed of β phase and equiaxed α phase; the volume fraction of equiaxed α phase is 31%, and the average size is 3-5 μm.

[0035] The β-transition temperature of the TC18 titanium alloy hot-forged bar was determined to be 865±5°C. In the first step, heat the alloy rod to 760°C for 6 hours, control the cooling rate to 2-3°C / s, and force air cooling to room temperature; in the second step, heat the alloy rod to 540°C for 8 hours, and then air cool to room temperature.

[0036] Table 1 shows the mechanical property parameters of the TC18 titanium alloy bar treated in this example at room temperature.

[0037]Mechanical properties of TC18 bar room temperature in table 1 example 1

[0038]

Embodiment 2

[0040] The TC18 titanium alloy hot-forged bar with Φ180mm×200mm is used, and its microstructure is composed of β phase and equiaxed α phase; the volume fraction of equiaxed α phase is 29%, and the average size is 4-5μm.

[0041] The β-transition temperature of the TC18 titanium alloy hot-forged bar was determined to be 865±5°C. The first step is to heat the alloy rod to 790°C for 2 hours, then control the cooling rate to 15-20°C / s, and water-cool to room temperature; the second step is to heat the alloy rod to 570°C for 6 hours, and then air-cool to room temperature.

[0042] Table 2 shows the mechanical property parameters of the TC18 titanium alloy bar treated in this example at room temperature.

[0043] Mechanical properties of the TC18 rod at room temperature in Table 2 Example 2

[0044]

Embodiment 3

[0046] The TC18 titanium alloy hot-forged bar with Φ180mm×200mm is used, and its microstructure is composed of β phase and equiaxed α phase; the volume fraction of equiaxed α phase is 33%, and the average size is 2-4μm.

[0047] The β-transition temperature of the TC18 titanium alloy hot-forged bar was determined to be 865±5°C. In the first step, heat the alloy rod to 770°C for 4 hours, control the cooling rate to 10-15°C / s, and cool it to room temperature with water; in the second step, heat the alloy rod to 600°C for 4 hours, and then air cool to room temperature.

[0048] Table 3 shows the mechanical property parameters of the TC18 titanium alloy rods treated in this example at room temperature.

[0049] TC18 bar room temperature mechanical properties in table 3 embodiment 3

[0050]

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Abstract

The invention relates to a thermal treatment process for a TC18 titanium alloy and belongs to the technical field of materials. A method comprises the following steps: preserving heat of the TC18 titanium alloy at the temperature between Tbeta-60 DEG C and Tbeta-100 DEG C (Tbeta is the beta-phase transition temperature of the alloy) for 2-8 hours, and cooling to the room temperature through air cooling or water cooling; aging the alloy at the temperature of 540-600 DEG C for 4-12 hours, and cooling to the room temperature through air cooling. By selecting the heat-preserving temperature, time and cooling way, the microscopic structure of the alloy can be regulated and controlled effectively, a microscopic structure in which an equiaxial phase alpha (the content is higher than 10 percent by volume, and the size is greater than 2 microns), a flaky phase alpha (the thickness is greater than 0.5 micron) as well as a large number of fine needle phase-alpha and phase-beta substrates are matched is realized, the TC18 titanium alloy is high in strength, plasticity and toughness, and the problems of poor alloy strength in a dual annealing process and difficulty in meeting the use requirements on the plasticity and toughness of the alloy in a solid solution-aging process are solved. The method is suitable for industrial application.

Description

technical field [0001] The invention discloses a TC18 titanium alloy heat treatment method, which belongs to the technical field of metal material heat treatment. Background technique [0002] The nominal composition of TC18 titanium alloy is Ti-5Al-5V-5Mo-1Cr-1Fe, which belongs to near β-type titanium alloy, which has good plastic deformation, deep hardenability and high strength (σ b ≥1100MPa), high fracture toughness (K 1C ≥50MPa·m 1 / 2 ) and other advantages, it is suitable for the manufacture of high-load-bearing aeronautical structural parts, and has received extensive attention in the aerospace field. In recent years, due to its superior performance, TC18 titanium alloy has gradually been used in ships, seawater desalination, automobile industry, sports and other fields. [0003] Heat treatment plays an important role in regulating the microstructure and mechanical properties of TC18 titanium alloy. The microstructure of TC18 titanium alloy is mainly composed of α ...

Claims

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Application Information

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IPC IPC(8): C22F1/18
Inventor 周科朝张骁泳邓喆李志友王广楠
Owner CENT SOUTH UNIV
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