Electromagnetic forming device and method for manufacturing titanium aluminum-based alloy directional fully-lamellar microstructure

An electromagnetic forming and base alloy technology, applied in the field of material processing, can solve problems such as unfavorable directional growth of columnar crystals, unfavorable control and stable forming, and easy loosening of induction coils, so as to eliminate unstable factors, reduce instability and avoid loosening Effect

Inactive Publication Date: 2012-09-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, due to the violent shaking of the forming inductor by the electromagnetic force during the electromagnetic forming process, and the induction coil is easy to loosen during repeated loading and unloading, it is not conducive to the control and stable forming of the electromagnetic forming process, and at the same time increases the possibility of equiaxed crystal nucleation , is not conducive to the directional growth of columnar crystals

Method used

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  • Electromagnetic forming device and method for manufacturing titanium aluminum-based alloy directional fully-lamellar microstructure
  • Electromagnetic forming device and method for manufacturing titanium aluminum-based alloy directional fully-lamellar microstructure
  • Electromagnetic forming device and method for manufacturing titanium aluminum-based alloy directional fully-lamellar microstructure

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Experimental program
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Effect test

Embodiment 1

[0048] This embodiment is an electromagnetic forming device for preparing oriented full-lamellar structures of titanium-aluminum-based alloys, including a thermal insulation cover 3 , a forming inductor 5 , a positioning plate 6 , a shielding cover 7 , an insulating plate 8 and clips 4 .

[0049] The shielding cover 7 is placed on the insulating plate 8 located on the upper surface of the water-cooled crystallizer 12 . A positioning plate 6 is placed on the upper surface of the shielding case 7 , and the forming inductor 5 is located on the upper surface of the positioning plate 6 . The thermal insulation cover 3 is located in the inner ring of the shaped inductor 5 . Four clips 4 are placed on the outer circumferential surface of the forming inductor in a cross-symmetrical manner, and at the same time, the lower surface of the horizontal plate of the clip is closely attached to the upper surface of the forming inductor, and connected to the flange 10 of the water-cooled cryst...

Embodiment 2

[0069] This embodiment is a method for preparing the oriented full-lamellar structure of a Ti-47Al sample by using the electromagnetic forming device for preparing the oriented full-lamellar structure of a titanium-aluminum-based alloy.

[0070] The first step is to install the seed crystal. A seed crystal 11 with a composition of Ti-43Al-3Si and a diameter of 12 mm is fixed on a drawing rod in a vacuum chamber.

[0071] The second step is to install the base material. Fix the base material 1 with a composition of Ti-47Al and a diameter of 12mm on the synchronization rod in the vacuum chamber, and ensure that the seed crystal 11, the base material 1, the insulation cover 3, the forming inductor 5, the shielding cover 7 and the pull rod are coaxial , while ensuring that the gap between the lower end surface of the base metal 1 and the upper end surface of the seed crystal 11 is 1-3 mm, and the gap between the lower end surface of the base metal 1 and the upper end surface of t...

Embodiment 3

[0077] This embodiment is a method for preparing the oriented full-lamellar structure of a Ti-48Al-8Nb sample by using the electromagnetic forming device for preparing the oriented full-lamellar structure of the titanium-aluminum-based alloy.

[0078] The first step is to install the seed crystal. A seed crystal 11 with a composition of Ti-43Al-3Si and a diameter of 12 mm is fixed on a drawing rod in a vacuum chamber.

[0079] The second step is to install the base material. Fix the base material 1 with a composition of Ti-48Al-8Nb and a diameter of 12mm on the synchronization rod in the vacuum chamber, and ensure that the seed crystal 11, the base material 1, the insulation cover 3, the forming inductor 5, the shielding cover 7 and the pull rod coaxial, and at the same time ensure that the gap between the lower end surface of the base metal 1 and the upper end surface of the seed crystal 11 is 1-3 mm. In this embodiment, the gap between the lower end surface of the base meta...

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Abstract

The invention provides an electromagnetic forming device and method for manufacturing titanium aluminum-based alloy directional fully-lamellar microstructure. A shield cover is placed on an insulation plate located at the upper surface of a water cooled crystallizer, a positioning plate is placed at the upper surface of the shield cover, a forming sensor is located at the upper surface of the positioning plate, a thermal insulation sleeve is located in the inner ring of the forming sensor, a clip is fixed at the outer circumferential surface of the forming sensor, the central hole of the shield cover, the central hole of the forming sensor and the central hole of the thermal insulation sleeve are coaxial, a seed crystal is located in the central hole of the shield cover, the lower end of the seed crystal is connected with a draw bar in a vacuum chamber, a base material is located in the thermal insulation sleeve, the upper end of the base material is connected with a synchronization rod in the vacuum chamber, and the seed crystal and the base material alloy are coaxial with the central hole of the forming sensor. The electromagnetic forming device provided by the invention can completely eliminate the influence of crucible contamination on alloy constituents and structure, manufacture an ideal directional fully-lamellar microstructure and improve the positioning precision of the forming sensor.

Description

technical field [0001] The invention relates to material processing technology, in particular to an electromagnetic forming device for preparing titanium-aluminum-based alloy samples and a method for obtaining oriented full-lamellar structures of titanium-aluminum-based alloys by using the device. Background technique [0002] TiAl-based intermetallic compounds have low density, high specific strength and specific elastic modulus, and can still maintain high enough strength and stiffness at high temperatures. At the same time, it also has good creep resistance and oxidation resistance. A new type of structural material for heat-resistant structural parts of engines used in aerospace, aviation and automobiles. Compared with the γ single-phase structure and the two-state structure, the oriented full-lamellar structure of the titanium-aluminum-based alloy has better high-temperature strength and room-temperature toughness, and is expected to be used in industrial production in ...

Claims

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Application Information

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IPC IPC(8): B22D27/02G01N1/28C22C14/00
Inventor 杜玉俊沈军熊义龙
Owner NORTHWESTERN POLYTECHNICAL UNIV
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