Large-specification Ti2AlNb alloy ring piece and manufacturing method thereof

A manufacturing method and alloy ring technology, which are applied in the field of forging manufacturing process, can solve the problem that the AlNb alloy integral casing cannot be rolled and formed, and achieve the effects of improving the lasting performance, expanding the rolling temperature range and increasing the temperature

Active Publication Date: 2021-01-29
BEIJING CISRI GAONA TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The first object of the present invention is to provide large size Ti 2 Manufacturing method of AlNb alloy rings to solve the large-scale Ti existing in the prior art 2 AlNb alloy rings such as large size Ti 2 The technical problem that AlNb alloy integral casing cannot be rolled into shape

Method used

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  • Large-specification Ti2AlNb alloy ring piece and manufacturing method thereof
  • Large-specification Ti2AlNb alloy ring piece and manufacturing method thereof
  • Large-specification Ti2AlNb alloy ring piece and manufacturing method thereof

Examples

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preparation example Construction

[0079] In a specific embodiment of the present invention, the Ti 2 The preparation method of AlNb alloy ring billet comprises the following steps:

[0080] Billeted Ti 2 After the AlNb alloy rod is kept at 1000~1050℃ for 1.5~2h, it is upsetting and drawn, and then upsetting and punching.

[0081] In a specific embodiment of the present invention, the strain rate of the upset and elongation is 0.01s -1 .

[0082] In actual operation, after the heat preservation treatment of the bar, it is placed on a press to perform the above operations.

[0083] In a specific embodiment of the present invention, the Ti 2 The weight of the AlNb alloy ring blank is above 350kg.

[0084] In a specific embodiment of the present invention, the Ti 2 The composition of AlNb alloy is Ti-20~22Al-24.5~26.5Nb by atomic percentage, such as Ti-22Al-25Nb. Specifically, the above atomic percentage of Ti-20~22Al-24.5~26.5Nb means that the atomic percentage of Al is 20%~22%, and the atomic percentage o...

Embodiment 1

[0088] Large size Ti 2 Manufacture of AlNb alloy rings (Ti with nominal composition Ti-22Al-25Nb 2 AlNb alloy as an example):

[0089] Fabricate large-scale Ti under the fabrication conditions listed in Table 1 2 AlNb alloy rings.

[0090] Table 1 Large size Ti 2 Manufacturing Conditions of AlNb Alloy Rings

[0091]

[0092] Note: T in the table 1 , T 2 , T 3 , T 4 respectively refer to the temperature, t 1 , t 2 , t 3 , t 4 respectively refer to time, k 1 、k 2 、k 3 、k 4 refer to the heating or cooling rate, respectively.

[0093] Large size Ti 2 The manufacture method of AlNb alloy ring, specifically comprises the following steps:

[0094] (1) Preparation of ring blank

[0095] Ti after billeting 2 AlNb alloy rods were placed in a high-temperature heat treatment furnace and heated to 1000-1050 °C for 120 min, then placed on a press for 0.01 s -1 Ti 2 AlNb alloy casing ring billet; among them, Ti 2 The weight of AlNb alloy casing ring blank is 450kg. ...

experiment example 1

[0111] The metallographic structures of the rings prepared in Example 1 and Comparative Examples 1-3 were respectively observed with a metallographic microscope.

[0112] The Ti that 1#~7# of the embodiment of the present invention 1 makes 2 The metallographic structure diagrams of AlNb alloy rings are shown in Figure 1~Figure 7 . As can be seen from the figure, the Ti produced by the manufacturing method of the present invention 2 There is no obvious B2 flat grain boundary in the microstructure of the AlNb alloy ring, and there is no continuous precipitated second phase at the B2 grain boundary. The average grain size of B2 is 300~500μm, and the primary O phase lath (O phase coarse lath) The volume percentage is 15%~30%, and the volume percentage of the secondary O phase lath (O phase thin lath) is 30%~40%.

[0113] The details are as follows:

[0114] figure 1 For the 1# large-scale Ti that the embodiment of the present invention 1 makes 2 Metallographic structure dia...

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Abstract

The invention relates to the technical field of forge piece manufacturing processes, in particular to a large-specification Ti2AlNb alloy ring piece and a manufacturing method thereof. The manufacturing method of the large-specification Ti2AlNb alloy ring piece comprises the following steps that after a Ti2AlNb alloy ring blank is subjected to heat preservation treatment at the beta transformationtemperature of a Ti2AlNb alloy or above, one-time rolling forming with the deformation larger than 45% is carried out, and then temperature control cooling is carried out. According to the manufacturing method, after the Ti2AlNb alloy ring blank is subjected to heat preservation treatment at at the beta transformation temperature of the Ti2AlNb alloy or above, it is guaranteed that no B2 straightgrain boundary influencing the plasticity of the alloy exists in a microstructure of the rolled alloy in a large-deformation one-time rolling forming mode. Meanwhile, the one-time rolling forming mode with large deformation is adopted, the temperature control cooling mode is combined, precipitation of a second phase alpha phase on the B2 grain boundary is limited, and therefore the situation thatplasticity is reduced due to brittle fracture of the alloy along grains is avoided.

Description

technical field [0001] The invention relates to the technical field of forging manufacturing technology, in particular to a large-scale Ti 2 AlNb alloy ring and its manufacturing method. Background technique [0002] Ti 2 AlNb alloy is a light-weight high-temperature structural material of Ti-Al intermetallic compound developed by the United States in the early 1990s. It has significant advantages such as high specific strength at high temperature, high specific modulus, low thermal expansion coefficient, and good flame retardancy. . Compared with traditional high-temperature titanium alloys, its service temperature can be increased by 100~200°C. Compared with traditional nickel-based superalloys, its specific gravity is only 60% of that of high-temperature alloys. Weighing about 30%, it is a promising lightweight high-temperature structural material for advanced aero-engines. [0003] Patent application CN104139139A discloses a Ti 2 Roll forming and heat treatment meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21H1/06B21K1/76C22F1/18C21D9/40
CPCB21H1/06B21K1/761C21D9/40C22F1/183
Inventor 梁晓波马雄史晓强张建伟张熹雯王红卫程云君周俊吉骆晨王新英
Owner BEIJING CISRI GAONA TECH
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