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Ti2AlNb alloy and preparation method of Ti2AlNb alloy bar

An alloy and bar technology, applied in the field of Ti-Al intermetallic compounds, can solve the problems of long-term creep performance at high temperature, unfavorable oxidation resistance, unfavorable creep performance, etc., and achieve good solid solution strengthening effect, weakening Forged texture, the effect of reducing surface oxidation

Active Publication Date: 2020-07-10
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ti 2 AlNb alloy is an important category of Ti-Al alloys, currently Ti 2 AlNb alloys gradually develop from Ti-Al-Nb ternary system to multi-component alloying, and the representative ternary Ti 2 AlNb alloys include Ti-23Al-24Nb, Ti-22Al-25Nb and Ti-22Al-27Nb, etc. Multi-alloyed Ti 2 AlNb alloys include Ti-22Al-20Nb-7Ta, Ti-22Al-24Nb-0.5Mo, Ti-22Al-23Nb-1Mo-1Zr, Ti-22Al-20Nb-2W, etc. Ti of V 2 AlNb alloys are also under development. The addition of V elements is beneficial to the process plasticity of the alloys, but the effect on the high-temperature durable creep properties remains to be investigated.
Existing Ti 2 The short board of AlNb alloy comes from two aspects: one is the oxidation resistance, Ti 2 The Nb content of AlNb alloys is generally above 20%, which falls in the area where the oxidation resistance is unfavorable; the second is that the creep performance is low, due to the high alloying characteristics, the flaky and dual-state Ti 2 The matrix B2 transformation structure of AlNb alloy is too small, which is not conducive to creep performance

Method used

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  • Ti2AlNb alloy and preparation method of Ti2AlNb alloy bar

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Embodiment Construction

[0026] Table 1 for Ti 2 AlNb alloy 7 kinds of metal components and their atomic percentage content,

[0027] Table 1 Ti 2 Composition of AlNb alloy ingot

[0028] serial number Composition, atomic percent 1 Ti-24Al-20Nb-0.5W-1Zr 2 Ti-23Al-20Nb-1W-1Zr 3 Ti-22Al-20Nb-2W-1Zr 4 Ti-23Al-20Nb-2W-1Zr-0.5Si 5 Ti-23Al-20Nb-1W-1Zr-1Hf 6 Ti-23Al-20Nb-1W-1Zr-1Ta 7 Ti-23Al-20Nb-1W-1Zr-1Mo

[0029] The steps of the method for preparing Ti2AlNb alloy rods in Table 1 are as follows:

[0030] ① A 100kg ingot of Ti2AlNb alloy was prepared by 3 times of vacuum consumable melting process. The atomic percentage of the chemical composition of the ingot is shown in Table 1. The ingot was turned and skinned, and the riser and bottom pad were cut off. The finished ingot specification was

[0031] ②The surface of the ingot is coated with anti-oxidation paint, and then heated and kept at 1120°C for 65 minutes. After reaching the holding time...

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Abstract

The invention relates to Ti2AlNb alloy and a preparation method of a Ti2AlNb alloy bar. The alloy comprises the following chemical components, in atomic percentage, of 22%-25% of Al, 20%-23% of Nb, 1%-8% of (Zr+Hf+W+Mo+Ta), greater than or equal to 0.5% of W, greater than or equal to 0.5% of Zr+Hf, and the balance Ti and inevitable impurities. A B2 single-phase region relatively-low-temperature upsetting and extrusion stretching composite process is adopted for ingot cogging, and a process of upsetting-stretching forging and stretching forming forging in two phase regions of (alpha2+B2) is further adopted to prepare the bar with the required specification. The provided Ti2AlNb alloy has good oxidation resistance, the tensile strength at 700 DEG C is 800 MPa or above, and the creep propertyat 700 DEG C is improved by 50%. The invention further provides a bar preparation method suitable for the Ti2AlNb alloy.

Description

technical field [0001] The present invention is a kind of Ti 2 The invention discloses a method for preparing AlNb alloy and rods thereof, belonging to the technical field of Ti-Al series intermetallic compounds. Background technique [0002] Compared with traditional high-temperature titanium alloys, Ti-Al alloys have the characteristics of low density, high specific strength, and good oxidation resistance. Ti 2 AlNb alloy is an important category of Ti-Al alloys, currently Ti 2 AlNb alloys gradually develop from Ti-Al-Nb ternary system to multi-component alloying, and the representative ternary Ti 2 AlNb alloys include Ti-23Al-24Nb, Ti-22Al-25Nb and Ti-22Al-27Nb, etc. Multi-alloyed Ti 2 AlNb alloys include Ti-22Al-20Nb-7Ta, Ti-22Al-24Nb-0.5Mo, Ti-22Al-23Nb-1Mo-1Zr, Ti-22Al-20Nb-2W, etc. Ti of V 2 AlNb alloys are also under development. The addition of V element is beneficial to the process plasticity of the alloy, but the effect on the high-temperature durable creep ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C14/00C22C1/03C22F1/18
CPCC22C1/03C22C14/00C22C30/00C22F1/18C22F1/183
Inventor 曹京霞张明达周毅谭启明隋楠黄旭
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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