Method for preparing TiAl-base alloy directional fully lamellar structure

A full-sheet, base alloy technology, applied in the field of material processing, can solve the problems of difficult seeding process, limited oriented full-sheet structure preparation and application, etc.

Inactive Publication Date: 2015-05-27
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large compositional differences between these seed crystals and the base metal, the seeding process

Method used

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  • Method for preparing TiAl-base alloy directional fully lamellar structure
  • Method for preparing TiAl-base alloy directional fully lamellar structure
  • Method for preparing TiAl-base alloy directional fully lamellar structure

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Embodiment 1

[0030] This embodiment is a method to keep the lamellar structure in the Ti-48Al-2Nb-2Cr alloy quasi-seed crystal stable by rapid heating, thereby controlling the lamellar direction in the directional solidification, and finally obtaining the directional full Method of lamellar organization.

[0031] The first step, sample preparation: Prepare a sample with a composition of Ti-48Al-2Nb-2Cr and a size of Φ30mm×70mm as a quasi-seed crystal alloy, and the lamellar direction in the quasi-seed crystal alloy is parallel to the axial direction of the sample . A sample whose composition is Ti-48Al-2Nb-2Cr and whose size is Φ30mm×200mm is prepared as the base metal alloy.

[0032] The second step is to install the sample: install the prepared quasi-seed crystal on the pull rod of the electromagnetic constrained forming directional solidification device. Install the base metal on the feeding rod of the electromagnetic constrained forming directional solidification device, and at the s...

Embodiment 2

[0037] This embodiment is a method to keep the lamellar structure in the Ti-48Al-6Nb-1Cr alloy quasi-seed crystal stable by rapid heating, so as to control the lamellar direction in the directional solidification, and finally obtain the directional completeness parallel to the pulling direction. Method of lamellar organization.

[0038] The first step, sample preparation: Prepare a sample with a composition of Ti-48Al-6Nb-1Cr and a size of Φ10mm×70mm as a quasi-seed crystal alloy, and the lamellar direction in the quasi-seed crystal is parallel to the sample axis. A sample with a composition of Ti-48Al-6Nb-1Cr and a size of Φ10mm×200mm was prepared as the base metal alloy.

[0039] The second step is to install the sample: install the prepared quasi-seed crystal on the pulling rod of the electromagnetic constrained forming directional solidification device, and ensure that the lamellar direction of the quasi-seed crystal is parallel to the pulling direction during directional ...

Embodiment 3

[0044] This embodiment is a method to keep the lamellar structure in the Ti-48Al-2Nb-2Cr alloy quasi-seed crystal stable by rapid heating, thereby controlling the lamellar direction in the directional solidification, and finally obtaining the directional full Method of lamellar organization.

[0045] The first step, sample preparation: Prepare a sample with a composition of Ti-48Al-2Nb-2Cr and a size of Φ25mm×70mm as a quasi-seed crystal alloy, and the lamellar direction in the quasi-seed crystal is parallel to the sample axis. A sample whose composition is Ti-48Al-2Nb-2Cr and whose size is Φ25mm×200mm is prepared as the base metal alloy.

[0046] The second step is to install the sample: install the prepared quasi-seed crystal on the pulling rod of the electromagnetic constrained forming directional solidification device, and ensure that the lamellar direction of the quasi-seed crystal is parallel to the pulling direction during directional solidification. Install the base m...

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Abstract

The invention relates to a method for preparing a TiAl-base alloy directional fully lamellar structure. During the heating and thermal insulation, a quick heating mode is adopted to keep the TiAl alloy lamellar structure stable in the heating process to achieve the goal of controlling the growth direction of the alpha phase in the directional solidification process, thereby preparing the directional fully lamellar structure in parallel to the growth direction. The method lowers the harsh requirements for the seed crystal material in the traditional seed crystal process, so that the lamellar structures, which are not suitable to be used as seed crystals due to low structure stability, can be used as a qualified quasi-seed crystal for controlling the lamellar structure in the directional solidification process, thereby simplifying the preparation technique of the TiAl-base alloy directional fully lamellar structure.

Description

technical field [0001] The invention relates to a directional solidification technology in the field of material processing, in particular to a quasi-seed crystal method for preparing a directional full-lamellar structure of a TiAl-based alloy. Background technique [0002] With the development of the aerospace industry, people have put forward more stringent requirements for the performance of high-temperature structural materials in aero-engines based on the design concept of higher operating temperature, lighter weight and faster operating speed. Due to the advantages of low density, high specific strength and specific elastic modulus, high temperature creep resistance and oxidation resistance, TiAl-based intermetallic compounds have gradually become very competitive materials for heat-resistant structural parts of aerospace, aviation and automotive engines. , which makes it show remarkable development prospects in aviation, aerospace, automobile, power generation, metall...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C14/00C30B28/06C30B29/52
Inventor 杜玉俊沈军韩军龙熊义龙
Owner NORTHWESTERN POLYTECHNICAL UNIV
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