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a ti 2 Alnb-based alloy and its preparation method and application

A technology of base alloy and matrix phase, applied in the field of Ti2AlNb base alloy and its preparation, can solve the problems of poor mold filling performance, coarse grain size and poor plasticity of alloy casting, and achieve excellent mold filling performance, small grain size, The effect of good strength and plasticity

Active Publication Date: 2022-03-22
BEIJING CISRI GAONA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ti used in prior art 2 AlNb alloy composition is based on forging or powder metallurgy process, such as Ti-22Al-25Nb, Ti-22Al-24Nb-0.5Mo, etc., but Ti used in other processes such as forging 2 Direct application of AlNb alloy composition will lead to poor filling performance of alloy casting
Although increasing the process conditions such as melt pouring temperature and shell preheating temperature can improve the filling performance to a certain extent, it will also bring problems such as coarse grains, serious segregation, and poor plasticity; excessive changes in the casting structure will offset the Advantages of investment casting near net shape

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  • a ti <sub>2</sub> Alnb-based alloy and its preparation method and application

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preparation example Construction

[0043] Some embodiments of the present invention also provide the above-mentioned Ti 2 A method for preparing an AlNb-based alloy, comprising the steps of:

[0044] (A) After proportioning the ingredients, Ti was prepared by one vacuum consumable melting, two vacuum consumable melting, and three vacuum shell melting 2 AlNb-based alloy ingot;

[0045] (B) put Ti 2 AlNb-based alloy ingots were poured into molds after suspension melting, and Ti was obtained after hot isostatic pressing and heat treatment. 2 AlNb-based alloys.

[0046] The present invention is by adopting specific composition and the Ti of proportioning 2 AlNb-based alloy ingredients, after smelting, hot isostatic pressing and heat treatment steps, the continuous B2 matrix in the alloy structure is distributed with normally distributed O phase laths and dispersed borides, which strengthen The role of the matrix, and the proper proportion of the B2 phase matrix plays a role in coordinating the deformation, so ...

Embodiment 1

[0053] This example provides Ti 2 Preparation of AlNb-based alloys, prepared Ti 2 The composition of the AlNb-based alloy is shown in Table 1.

[0054] Alloy No. Alloy composition-mass percentage (%) 1# Al 10.9%, Nb 41.2%, B 0.02%, balance Ti 2# Al 10.9%, Nb 41.2%, B 0.04%, balance Ti 3# Al 10.9%, Nb 41.2%, B 0.06%, balance Ti 4# Al 10.9%, Nb 41.2%, B 0.02%, V 0.5%, balance Ti

[0055] Specifically, the above Ti 2 The preparation method of AlNb-based alloy comprises the following steps:

[0056] Ingots are prepared by the smelting method of vacuum self-consumption + self-consumption + solidified shell. The specific process is: ingredient calculation, electrode pressing, electrode group welding, one vacuum consumable smelting, two vacuum consumable smelting, three vacuum shell melting. The raw materials required for ingot casting include: sponge titanium, high-purity aluminum beans, pure Nb shavings, AlB master alloy, AlSi master allo...

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Abstract

The present invention relates to Ti 2 AlNb-based alloy technical field, especially relates to a kind of Ti 2 AlNb-based alloys and their preparation methods and applications. Ti of the present invention 2 AlNb-based alloys are mainly composed of the following components by mass percentage: Al 10%~11%, Nb 41%~43%, B 0.02%~0.06%, Ti 46%~48%. The present invention through the Ti 2 The AlNb-based alloy composition and ratio relationship are rationally designed. On the basis of reducing the Nb content, a small amount of B element is added to make Ti 2 AlNb-based alloys have good fluidity, are suitable for casting processes, have excellent mold filling properties, and have both good strength and plasticity, which can reach Ti 2 Requirements for mechanical properties of AlNb-based alloys.

Description

technical field [0001] The present invention relates to Ti 2 AlNb-based alloy technical field, especially relates to a kind of Ti 2 AlNb-based alloys and their preparation methods and applications. Background technique [0002] Ti 2 Due to its high specific strength, creep resistance, oxidation resistance and other advantages, AlNb-based alloys have gradually become lightweight high-temperature engine structural materials replacing nickel-based superalloys for aerospace engines. Currently, Ti 2 The processes of AlNb alloy aero-engine parts mainly include forging forming, casting forming, powder metallurgy and 3D printing. Among them, the casting forming process can not only save costs, but also directly obtain thin-walled complex structural parts, and can prepare large-sized casings and other parts for aerospace engines. [0003] At present, under conventional investment casting process conditions, Ti 2 AlNb alloy castings are prone to defects such as cold shut and ins...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22F1/18
CPCC22C30/00C22C14/00C22F1/183
Inventor 张熹雯张建伟马雄梁晓波王红卫骆晨张健
Owner BEIJING CISRI GAONA TECH