Method for obtaining tri-modal microstructure in dual-phase titanium alloy through furnace cooling

A titanium alloy and microstructure technology, applied in the field of titanium alloy thermal processing, can solve the problems of small thickness of secondary sheet α, inconvenient forging temperature, narrow temperature range, etc.

Inactive Publication Date: 2013-05-29
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the problems in the prior art that the temperature range is narrow, it is not convenient to control the forging temperature, and the limitation of the initial structure is a two-state structure, and the thickness of the secondary lamellar α in the obtained three-state structure is too small problem, the present invention proposes a method for obtaining a triple-state structure in a dual-phase titanium alloy by furnace cooling

Method used

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  • Method for obtaining tri-modal microstructure in dual-phase titanium alloy through furnace cooling
  • Method for obtaining tri-modal microstructure in dual-phase titanium alloy through furnace cooling
  • Method for obtaining tri-modal microstructure in dual-phase titanium alloy through furnace cooling

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Embodiment 1

[0015] This embodiment is a method for obtaining a titanium alloy with a three-state structure through furnace cooling. The sample used is a TA15 titanium alloy, and the shape of the sample is cylindrical. The specification of the sample is Φ10*15mm; the TA15 titanium alloy is Ti-6Al-2Zr-1Mo-1V. The β transformation point of TA15 titanium alloy is 990°C, and the initial structure is equiaxed.

[0016] The specific implementation steps of this embodiment are:

[0017] Step 1, heat preservation and water cooling near the β temperature.

[0018] Heat the resistance furnace to the near β temperature of the TA15 titanium alloy, that is, the temperature range of 10-20°C lower than the β transformation point. In this embodiment, the temperature of the resistance furnace is 975° C., which is 15° C. lower than the beta temperature of the TA15 titanium alloy. When the temperature of the resistance furnace reaches 975°C, put the cylindrical sample into the resistance furnace. Heat th...

Embodiment 2

[0026] This embodiment is a method for obtaining a titanium alloy with a three-state structure through furnace cooling. The sample used is a TA15 titanium alloy. The shape of the sample is cylindrical, and the specification of the sample is Φ55*70mm; the TA15 titanium alloy is Ti-6Al-2Zr-1Mo-1V. The β transformation point of TA15 titanium alloy is 990°C, and the initial structure is a two-state structure.

[0027] The specific implementation steps of this embodiment are:

[0028] Step 1, heat preservation and water cooling near the β temperature. The resistance furnace is heated to the near β temperature of the TA15 titanium alloy, that is, the temperature range is 10-20°C lower than the β transformation point. In this embodiment, the temperature of the resistance furnace is 970°C, which is 20°C lower than the β temperature of the TA15 titanium alloy. When the temperature of the resistance furnace reaches 970°C, put the cylindrical sample into the resistance furnace. Heat t...

Embodiment 3

[0032] This embodiment is a method for obtaining a three-state structure in a titanium alloy. The sample used is a TC4 titanium alloy. The shape of the sample is cylindrical, and the specification of the sample is Φ30*45mm; the TC4 titanium alloy is Ti -6Al-4V. The β transformation point of TC4 titanium alloy is 985°C, and the initial structure is equiaxed.

[0033] The specific implementation steps of this embodiment are:

[0034] Step 1, heat preservation and water cooling near the β temperature. The resistance furnace is heated to the near β temperature of the TC4 titanium alloy, that is, the temperature range is 10-20°C lower than the β transformation point. In this embodiment, the temperature of the resistance furnace is 975°C, which is 10°C lower than the β temperature of the TC4 titanium alloy. When the temperature of the resistance furnace reaches 975°C, put the cylindrical sample into the resistance furnace. Heat the resistance furnace to 975°C and start heat prese...

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Abstract

The invention discloses a method for obtaining a tri-modal microstructure in dual-phase titanium alloy through furnace cooling. The method comprises the following steps of: carrying out heat insulation water cooling at near beta temperature; carrying out heat insulation furnace cooling in a common two-phase region and carrying out heat insulation air cooling in a two-phase region at lower temperature. 10-20% of primary equiaxial alpha phases are remained in a titanium alloy microstructure through carrying out heat insulation water cooling at near beta temperature, and the rests are martensites. A test sample microstructure is changed into alpha equal axle, alpha thick silvers and beta residues through carrying out heat insulation furnace cooling in the common two-phase region. The titanium alloy with the tri-modal microstructure is obtained through carrying out heat insulation air cooling in the two-phase region at lower temperature. The method is free of near beta thermal deformation, deformation and nonuniform thermal effect and easy for temperature control, and a dual-modal microstructure can be obtained without carrying out special pretreatment on a primary equiaxial microstructure of the titanium alloy. The method is simple, convenient, feasible and wide in application rang and can be widely used for thermal treatment of titanium alloy parts manufactured by using methods such as rolling, squeezing, machining, forming and the like so as to obtain the tri-modal microstructure.

Description

technical field [0001] The invention relates to the technical field of thermal processing of titanium alloys, in particular to a heat treatment method for obtaining a triple-state structure through furnace cooling in a dual-phase titanium alloy with an equiaxed structure or a double-state structure. Background technique [0002] As a high-performance material, duplex titanium alloy has the advantages of low density, high specific strength, high temperature resistance, and corrosion resistance. It plays an important role in aerospace, petrochemical, and biopharmaceutical fields. Especially as a key load-bearing structural part in aviation, it requires not only good room temperature strength plasticity, fracture toughness, fatigue performance, crack growth resistance and high temperature performance. The microstructure of titanium alloy determines its service performance. Duplex titanium alloy has equiaxed structure, two-state structure, Widmanstatten structure, basket struct...

Claims

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Application Information

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IPC IPC(8): C22F1/18
Inventor 杨合孙志超郭双双张珏
Owner NORTHWESTERN POLYTECHNICAL UNIV
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