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Preparing method of large-scale Ti-Al-Nb series alloy fine grain casting ingot

A large-scale, alloy technology, applied in the field of lightweight high-temperature structural material preparation, can solve problems such as ingot structure coarsening, achieve uniform and fine grains, improve composition uniformity, and solve the effect of coarse microstructure

Inactive Publication Date: 2017-05-31
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Based on the problems existing in the prior art, the purpose of the present invention is to provide a method for preparing large-scale Ti-Al-Nb alloy fine-grained ingots, which can be smelted to prepare large-scale Ti-Al-Nb alloys with high quality stability. Intermetallic compound fine-grained ingot, which solves the problem of coarsening the structure of the ingot and reduces the segregation tendency of the ingot

Method used

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  • Preparing method of large-scale Ti-Al-Nb series alloy fine grain casting ingot
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  • Preparing method of large-scale Ti-Al-Nb series alloy fine grain casting ingot

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preparation example Construction

[0019] The embodiment of the present invention provides a method for preparing a large-scale Ti-Al-Nb alloy fine-grained ingot, which is a smelting preparation of a large-scale Ti-Al-Nb intermetallic compound fine-grained ingot with high quality stability The method can realize the smelting preparation of a large-scale Ti-Al-Nb series intermetallic ingot, solve the problem of coarsening the ingot structure, and reduce the segregation tendency of the ingot, including the following steps:

[0020] Step 1. According to the mass percentages of Ti, Al, and Nb in the nominal chemical composition of the Ti-Al-Nb alloy, the raw materials are weighed, and the raw materials are evenly mixed and pressed into several electrode blocks;

[0021] Step 2, welding several electrode blocks made in the step 1 into a consumable electrode in batches;

[0022] Step 3. Carrying out one or more vacuum consumable smelting on the consumable electrode produced in the above step 2 to obtain a semi-finish...

Embodiment 1

[0032] This embodiment is a Ti 2 The preparation method of AlNb series intermetallic compound alloy fine-grained ingot, what is prepared is a diameter of Ф540mm, a weight of 3000kg, and a nominal chemical composition of Ti-22at%Al-25at%Nb (wherein at% is atomic percentage content) Large size Ti 2 AlNb series intermetallic compound alloy fine-grained ingot, comprising the following steps:

[0033] Step 1. Proportioning raw materials according to the nominal chemical composition (Ti-22at%Al-25at%Nb), weighing 1396kg of titanium sponge, 327.97kg of aluminum beans, and 1277.22kg of niobium strips, dividing the above-mentioned raw materials into 30 parts, and then each Three kinds of raw materials were uniformly mixed, and then pressed into 30 electrode blocks.

[0034] Step 2: Using the plasma arc welding method, every 6 electrode blocks prepared in step 1 are welded into 1 consumable electrode, and 5 consumable electrodes are obtained.

[0035] Step 3: Melting the 5 consumable...

Embodiment 2

[0043] This embodiment is a Ti 2 The preparation method of AlNb series intermetallic compound alloy fine-grained ingot is prepared as a diameter of Ф460mm, a weight of 600kg, and a nominal chemical composition of Ti-22at%Al-25at%Nb (wherein at% is atomic percent content ) of Ti 2 AlNb series intermetallic compound alloy fine-grained ingot, comprising the following steps:

[0044] Step 1. Proportioning raw materials according to the nominal chemical composition (Ti-22at%Al-25at%Nb), weighing 279.22kg of titanium sponge, 65.59kg of aluminum beans, and 255.44kg of niobium strips, dividing the above-mentioned raw materials into 6 parts respectively, and then Each of the three raw materials is uniformly mixed and then pressed into six electrode blocks.

[0045] Step 2: Using the plasma arc welding method, the 6 electrode blocks prepared in Step 1 are assembled and welded into a consumable electrode.

[0046] Step 3: Melting the consumable electrode prepared in step 2 into a semi...

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Abstract

The invention discloses a preparing method of a large-scale Ti-Al-Nb seriesintermetallic compound fine grain casting ingot. The method includes the steps that raw materials according to the name chemical composition ratio are evenly mixed to be pressed into a plurality of electrode blocks, then the multiple electrode blocks are installed and welded to form a consumable electrode, and the large-scale Ti-Al-Nb series alloy fine grain casting ingot is prepared through one time or multiple times of vacuum self-consuming arc melting and last synchronous helium cooling vacuum self-consuming arc melting. The preparing method has the beneficial effects that the last synchronous helium cooling vacuum self-consuming arc melting technology is adopted, the cooling speed of a bath can be increased, the bath depth can be reduced, the pasty two-phase zone size is reduced, the diffusion distance of metal elements in the solidification process is reduced accordingly, the dynamic condition of solidification is improved, non-balance solidification is formed microcosmically, the segregation tendency of the casting ingot is reduced, casting ingot tissues are refined, and the large-scale casting ingot with high ingredient accuracy and even and wee crystalline grains can be obtained.

Description

technical field [0001] The invention belongs to the field of preparation of light-weight high-temperature structural materials, and in particular relates to a method for preparing a large-scale Ti-Al-Nb alloy fine-grained ingot. Background technique [0002] Ti-Al-Nb series metal compounds have the advantages of high specific strength, low density, excellent oxidation resistance, and good high-temperature mechanical properties. They are lightweight high-temperature structural materials that have been researched and developed in the field of high-tech materials at home and abroad in the past two decades. It can be applied to the production of components of various advanced engine systems in the fields of aviation, aerospace and automobiles, as well as heat-resistant components in the overall structure of aerospace vehicles, to meet the urgent requirements of reducing dead weight and improving performance, and effectively improving the performance of various vehicles Level, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/20C22C1/02C22C30/00C22C14/00
CPCC22B9/20C22C1/02C22C14/00C22C30/00
Inventor 张建伟马雄夏冰骆晨梁晓波王新英程云君
Owner CENT IRON & STEEL RES INST
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