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Ti2AlNb-based alloy for casting, preparation method of Ti2AlNb-based alloy and casting

A technology of base alloy and ingot, applied in the field of Ti2AlNb base alloy for casting and its preparation, can solve the problems of coarse grain, poor plasticity, difficulty in filling and completeness, etc., and achieve the effect of good strength, plasticity and excellent casting performance.

Active Publication Date: 2022-01-28
BEIJING CISRI GAONA TECH
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Problems solved by technology

[0004] But the existing Ti 2 AlNb-based alloy composition Ti produced by casting process 2 AlNb-based alloy products are difficult to fill completely, and there are problems such as coarse grains, serious segregation, and poor plasticity, which greatly limit the application of the alloy.

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  • Ti2AlNb-based alloy for casting, preparation method of Ti2AlNb-based alloy and casting
  • Ti2AlNb-based alloy for casting, preparation method of Ti2AlNb-based alloy and casting

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preparation example Construction

[0045] In some embodiments of the present invention, the above-mentioned Ti for casting is also provided 2 A method for preparing an AlNb-based alloy, comprising the steps of:

[0046] (A) After proportioning the ingredients, Ti was prepared by suspension smelting 2 AlNb-based alloy ingot;

[0047] (B) put Ti 2 AlNb-based alloy ingots were remelted and poured into molds, and Ti was obtained for casting after hot isostatic pressing and heat treatment. 2 AlNb-based alloys.

[0048] The present invention adopts specific composition and proportioning Ti for casting 2 AlNb-based alloy ingredients, after smelting, hot isostatic pressing and heat treatment steps, can produce Ti with higher strength and plasticity 2 AlNb-based alloys; Ti for this casting 2 The grain size of the AlNb-based alloy is less than 300 μm, and the microstructure is a continuous B2 matrix with normally distributed O-phase laths. The average size of the O-phase laths is about 4 μm, and the O-phase volume ...

Embodiment 1

[0057] This embodiment provides Ti for casting 2 Preparation of AlNb-based alloys, the obtained Ti for casting 2 The composition of the AlNb-based alloy is shown in Table 1.

[0058] Table 1

[0059] Alloy No. Alloy composition-mass percentage (%) 1# Al 10.9%, Nb 42.6%, Si 0.10%, balance Ti 2# Al 10.9%, Nb 42.6%, Si 0.05%, balance Ti 3# Al 10.9%, Nb 42.6%, Si 0.15%, balance Ti

[0060] Specifically, the above casting Ti 2 The preparation method of AlNb-based alloy comprises the following steps:

[0061] Put the prepared sponge titanium, pure niobium chips, aluminum beans, AlSi master alloy, etc. into the water-cooled copper crucible of the suspension furnace, in which the AlSi master alloy is wrapped with aluminum foil and placed in the middle of the height of the copper crucible, and then vacuumized to prepare for melting ;When the vacuum degree is ≤3Pa, fill it with argon to 5000Pa for inert atmosphere protection; start from 200kW, melt ...

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Abstract

The invention relates to the technical field of Ti2AlNb-based alloys, in particular to a Ti2AlNb-based alloy for casting, a preparation method of the Ti2AlNb-based alloy and a casting. The Ti2AlNb-based alloy for casting disclosed by the invention is prepared from the following components, by mass: 10.5 to 11.3 percent of Al, 42.0 to 43.0 percent of Nb, 0.05 to 0.15 percent of Si and the balance of Ti and inevitable impurities. According to the Ti2AlNb-based alloy and the preparation method thereof, the components and the matching relation of the Ti2AlNb-based alloy are reasonably designed, and a trace amount of Si is added, so that the Ti2AlNb-based alloy has good casting performance, is suitable for a casting process, has good strength and plasticity, and can meet the requirements of the Ti2AlNb-based alloy on mechanical properties in the using process.

Description

technical field [0001] The present invention relates to Ti 2 The technical field of AlNb-based alloys, especially Ti for casting 2 AlNb-based alloy and its preparation method and casting. Background technique [0002] In recent years, with the further development of material science, especially the development of aerospace and other fields, higher and higher requirements have been put forward for the performance of materials. Ti-Al alloys have become one of the important materials in the field of aerospace due to their excellent comprehensive properties. Ti 2 As an important category of Ti-Al alloys, AlNb-based alloys are lightweight high-temperature resistant structural materials with high specific strength, high fracture toughness, good oxidation resistance, excellent heat resistance and flame retardancy. and other advantages, so it has attracted widespread attention. [0003] Casting is a method in which liquid metal is poured into a casting cavity adapted to the sha...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22F1/18
CPCC22C30/00C22C14/00C22F1/183
Inventor 张熹雯王红卫马雄张建伟梁晓波骆晨张健
Owner BEIJING CISRI GAONA TECH
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