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Method for obtaining tri-state tissue from titanium alloy

A titanium alloy and microstructure technology, applied in the field of heat treatment to obtain three-state microstructure, can solve the problems of complex forging control and high local temperature of forgings

Active Publication Date: 2013-12-25
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the inhomogeneous deformation heat effect existing in the prior art, which makes the local temperature of the forging too high, or makes the forging control more complicated, the present invention proposes a method for obtaining a triple-state structure in titanium alloys

Method used

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  • Method for obtaining tri-state tissue from titanium alloy
  • Method for obtaining tri-state tissue from titanium alloy
  • Method for obtaining tri-state tissue from titanium alloy

Examples

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Embodiment 1

[0019] This embodiment is a method for obtaining a three-state structure in a titanium alloy. The sample used is a TA15 titanium alloy. The shape of the sample is cylindrical, and 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.

[0020] The specific implementation steps of this embodiment are:

[0021] Step 1, heat treatment near 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 975°C, which is 15°C lower than the β 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 the resistance furnace to 975°C and start heat preservation. The...

Embodiment 2

[0028]This embodiment is a method for obtaining a three-state structure in a titanium alloy. 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 equiaxed.

[0029] The specific implementation steps of this embodiment are:

[0030] Step 1, heat treatment near 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 the resistance furnace to 970°C and start heat preservation. The ...

Embodiment 3

[0034] 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.

[0035] The specific implementation steps of this embodiment are:

[0036] Step 1, heat treatment near 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 preservation. The heat preserv...

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Abstract

The invention discloses a method for obtaining a tri-state tissue from a titanium alloy, and is characterized in that through thermal treatment at near beta temperature, a test sample tissue is changed to an alpha isometric+martensite; through temperature solution in a two-phase region, the test sample tissue is changed to an alpha isometric+alpha silver+martensite; and the titanium alloy with the tri-state tissue is obtained through annealing. According to the invention, near beta thermal deformation is not required, a deformation temperature rise effect cannot be generated, the temperature is easy to control, and an initial isometric tissue of the titanium alloy can become a duplex tissue without special pretreatment. The method, provided by the invention, is simple and easy, and wide in application range, and can be applied to thermal treatment of titanium alloy parts, which are produced by methods, such as rolling, extrusion, machining and the like, so that the tri-state tissue is obtained. In particular for complicated titanium components, locally complicated components or large components, after a near clean form of the components is obtained through machining, the tri-state tissue is obtained through the method provided by the invention.

Description

technical field [0001] The invention relates to the technical field of titanium alloy thermal processing, in particular to a heat treatment method for obtaining a triple-state structure in an equiaxed titanium alloy. Background technique [0002] Titanium alloy has excellent comprehensive properties and has been highly valued and widely used in aviation, aerospace, shipbuilding, biomedicine and other fields. Especially as a key load-bearing structural part in aerospace, it requires not only good plasticity and thermal stability, but also good strength, high temperature performance (durability, creep), fracture toughness, fatigue performance, and crack growth resistance. The microstructure of titanium alloy determines the mechanical properties and thus its service performance. Titanium alloys are usually obtained by forming and heat treatment to obtain equiaxed structure, two-state structure, Widmanstatten structure and basket structure. These four structures have their own...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18
Inventor 孙志超杨合郭双双马超
Owner NORTHWESTERN POLYTECHNICAL UNIV
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