Heat processing technique for thinning TiAl-base alloy sheet interlayer spacing

A technology of lamellar spacing and base alloy, which is applied in the field of heat treatment process for thinning the lamellar spacing of TiAl-based alloys, which can solve the problems of low strength, poor room temperature plasticity and fracture toughness of TiAl-based alloys, etc.

Inactive Publication Date: 2008-01-09
BEIHANG UNIV
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Problems solved by technology

[0005] In order to solve the problems of poor room temperature plasticity, fracture toughness, and low strength of TiAl-based alloys, the present invention proposes a heat treatment process for refining the interlayer spacing of TiAl-based alloys

Method used

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  • Heat processing technique for thinning TiAl-base alloy sheet interlayer spacing
  • Heat processing technique for thinning TiAl-base alloy sheet interlayer spacing
  • Heat processing technique for thinning TiAl-base alloy sheet interlayer spacing

Examples

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Embodiment 1

[0037] Example 1 The ingot of TiAl-based alloy (Ti-47Al-2Cr-2Nb) with full lamellar shape after casting is subjected to lamellar refinement treatment, and the specific process steps are as follows:

[0038] Step 1: Homogenize the Ti-47Al-2Cr-2Nb alloy at 900°C / 48h, and then perform hot isostatic pressing. The processing standard is 1280°C / 175MPa / 4h.

[0039] The second step: putting the Ti-47Al-2Cr-2Nb alloy treated in the first step into a vacuum heat treatment furnace for cyclic aging treatment in the α+γ dual-phase zone. The specific steps are:

[0040] (A) at a heating rate of 8.33×10 -2 ℃ / s to raise the temperature of the Ti-47Al-2Cr-2Nb alloy to 1180℃ in the first temperature zone of the α+γ dual-phase zone, and keep it warm for 5 minutes;

[0041] (B) At the heating rate v h =3.33×10 -2 °C / s raise the temperature of the Ti-47Al-2Cr-2Nb alloy treated in step (A) to 1280 °C in the second temperature zone of the α+γ dual-phase zone, and keep it for 15 minutes;

[004...

Embodiment 2

[0048] Example 2 The TiAl-based alloy (Ti-45Al-8.5Nb-0.1C) ingot formed by vacuum self-consumption solidification is subjected to lamellar refinement treatment. The specific process steps are:

[0049] Step 1: Homogenize the Ti-45Al-8.5Nb-0.1C alloy at 1050°C / 12h, and then perform hot isostatic pressing. The treatment standard is 1250°C / 200MPa / 3h.

[0050] The second step: putting the Ti-45Al-8.5Nb-0.1C alloy treated in the first step into a vacuum heat treatment furnace for cyclic aging treatment in the α+γ dual-phase zone. The specific steps are:

[0051] (A) at a heating rate of 8.33×10 -2 ℃ / s to raise the temperature of Ti-45Al-8.5Nb-0.1C alloy to 1200℃ in the first temperature zone of α+γ dual-phase zone, and keep it warm for 3min;

[0052] (B) At the heating rate v h =5.00×10 -2 °C / s raise the temperature of the Ti-45Al-8.5Nb-0.1C alloy treated in step (A) to 1300 °C in the second temperature zone, and keep it for 20 minutes;

[0053] (C) at cooling rate v c =2.0...

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Abstract

A heat treatment of TiAl based alloy is used to fine lamellar distance, which is available for TiAl with 45-51at% Al content or TiAl with 42-46at% Al and 5-10at% Nb. Cast ingots are treated by homogenizing, heat isopressing, and aging at alpha and gamma zones cyclically. Parameters, e.g. heating and cooling rates, temperatures are all controlled to refine layer distance while keeping lamellar status.

Description

technical field [0001] The invention relates to a heat treatment process for an alloy, in particular to a heat treatment process for thinning the lamellar spacing of a TiAl-based alloy, and the thinned alloy lamellar structure has good uniformity and stability. Background technique [0002] TiAl-based alloy is a new type of high-temperature structural material, which has the advantages of high melting point, low density, high elastic modulus, good high-temperature strength, flame retardancy, and oxidation resistance. High-quality high-temperature structural materials are considered to be one of the structural materials for next-generation aero-engines with great competitive potential. Its superiority is mainly reflected in the following three aspects: First, TiAl-based alloys have high specific strength. As a structural material, TiAl-based alloy has a relatively high elastic modulus, which is about 50% higher than that of currently used structural materials, and its densit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
Inventor 马岳赵勇裴延玲宫声凯徐惠彬
Owner BEIHANG UNIV
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