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Method for sheathing and rolling as-cast TiAl alloy platebased on composite structural design

A technology of alloy sheet and composite structure, which is applied in the field of intermetallic compound material sheet manufacturing, can solve the problems of difficult preparation of thin sheets, achieve low-cost thin sheets, reduce sheet costs, and achieve high-quality effects

Active Publication Date: 2018-02-16
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for directly rolling cast TiAl alloy plates based on the structure design of the composite sheath, which solves the problem that thin plates of TiAl intermetallic compound materials are difficult to prepare

Method used

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  • Method for sheathing and rolling as-cast TiAl alloy platebased on composite structural design
  • Method for sheathing and rolling as-cast TiAl alloy platebased on composite structural design
  • Method for sheathing and rolling as-cast TiAl alloy platebased on composite structural design

Examples

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preparation example Construction

[0028] The preparation of the blank in step 1: the TiAl alloy ingot is obtained through vacuum consumable arc melting and three times of remelting, followed by homogenization annealing treatment. The plate-shaped blank is obtained by wire electric discharge cutting, and after mechanical grinding treatment, the surface finish reaches Ra6-Ra8, and then chamfering treatment is used as the base material for rolling.

[0029] Step 2 Composite sheathed slab preparation:

[0030] The surface of the TiAl slab is uniformly covered with heat-resistant glass coating / graphite paper as an anti-oxidation / lubricating coating.

[0031] Select a chemically stable and heat-insulating metal material (pure titanium or titanium alloy) as the inner layer jacket, with a thickness of 1-10mm; the inner layer jacket can prevent heat flow loss, interface reaction and surface oxidation, and the thickness is too thin It is easy to lead to poor protection performance and unstable sheath structure during r...

Embodiment 1

[0039] In this embodiment, the method for directly rolling the as-cast TiAl alloy plate based on the composite sheath structure design, the specific method is as follows:

[0040]Billet preparation: TiAl alloy ingots were obtained by vacuum consumable arc melting, and 10mm thick square billets were obtained by wire electric discharge cutting. After mechanical grinding, the surface finish was Ra7, and TiAl alloy rolling billets were obtained;

[0041] The production of the sheath: First, the surface of the TiAl alloy is evenly covered with a heat-resistant glass anti-oxidation coating with a thickness of 0.2mm; then the TC4 titanium alloy is used as the inner sheath material for sealing and welding by a vacuum electron beam welding machine to obtain the inner layer Sheath; place isolated metal plates (such as: Mo sheet, thickness 0.3mm) on both sides of the inner sheath and then make the outer sheath; the material of the outer sheath is 2520 stainless steel and seal welding, the...

Embodiment 2

[0047] The difference from Example 1 is that in this example, the selected inner and outer sheath materials are pure titanium and nickel-based superalloy respectively, the rolling and holding temperature is 1250°C, and the rolling speed is 0.1m / s , The pass deformation is 10% to 15%. Other processing steps and process parameters are the same as in Embodiment 1. The final total deformation is 90%, the thickness of the obtained TiAl alloy sheet is 1-1.1mm, the surface smoothness is good, and there is no crack defect.

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Abstract

The invention belongs to the manufacturing field of intermetallic compound material plates, in particular to a method for sheathing and rolling an as-cast TiAl alloy plate based on a composite structural design. The method comprises the following steps of: obtaining a TiAl alloy cast ingot through vacuum consumable electric arc smelting, and annealing, cutting and grinding the TiAl alloy cast ingot to obtain a rolling material; selecting an inner-layer sheathing material which is chemically stable and has a heat insulating effect, an outer-layer sheathing material with good high-temperature strength and an anti-oxidization coating / isolating metal of a contact interface, and performing soldering and sealing after designing a composite structure and a layer-thickness ratio, thereby obtainingcomposite sheathed slab; sheathing and rolling the as-cast TiAl alloy, and controlling process parameters such as a rolling temperature, pass deformation amount and rolling speed, thereby finally obtaining a high-quality TiAl alloy thin plate with a target dimension. The method improves deformation matching performance and stability of the sheathed rolled slab, reduces deformation stress, directly prepares the as-cast TiAl alloy high-quality thin plate, is simple and stable in process, effectively improves production efficiency and reduces the board cost.

Description

technical field [0001] The invention belongs to the field of intermetallic compound material plate manufacturing, and in particular relates to a TiAl alloy plate rolling method based on a composite cladding structure design. Background technique [0002] TiAl alloy has the characteristics of low density, good high temperature strength, and excellent high temperature oxidation resistance and creep resistance. It is a new type of lightweight high temperature resistant structural material with great potential. TiAl alloy sheets can be used to prepare nozzles for high-performance engines, thermal protection systems for ultra-high-speed aircraft, wings, shells, etc. Improve the working efficiency of the engine. However, TiAl alloys are inherently brittle, have low plasticity at room temperature, poor high-temperature deformation ability, and insufficient high-temperature oxidation resistance, which seriously restricts the hot forming of TiAl alloys and the preparation of large-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22F1/04
Inventor 刘国怀王昭东李天瑞付天亮李勇李家栋韩毅王国栋
Owner NORTHEASTERN UNIV
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