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TiAl alloy crystal grain refinement method

A grain refining and alloying technology, applied in the field of TiAl alloy grain refining, can solve the problems of low material utilization rate, high preparation cost, deterioration of mechanical properties of titanium-aluminum structural parts, etc., and achieves high material utilization rate and simple operation. , a wide range of effects

Active Publication Date: 2014-01-08
重庆两航金属材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to overcome the disadvantages of easy introduction of inclusions in the prior art, deterioration of mechanical properties of titanium-aluminum structural parts, low material utilization rate, and high preparation cost, the present invention proposes a TiAl alloy grain refinement method

Method used

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Embodiment 1

[0033] This embodiment is a TiAl alloy grain refinement method.

[0034] TiAl alloys can be divided into three types according to the solidification path, including β solidification, peritectic solidification and α solidification. The solidification path of this embodiment is a peritectic solidification path, and the materials involved are Ti48Al2Cr2Nb, Ti47Al2Cr2Nb, Ti46Al2Cr2Nb and Ti(45-49)Al. In this embodiment, only Ti48Al2Cr2Nb alloy is taken as an example to describe in detail.

[0035] The primary phase of the Ti48Al2Cr2Nb alloy is β, and its solidification path is L→L+β→L+α→α→α+γ→α 2 +γ, the alloy undergoes a peritectic reaction during solidification, and it is easy to generate coarse columnar crystals, such as figure 1 As shown, the lamella clusters formed by the solid-state phase transition process are relatively coarse, about 3-5mm.

[0036] The concrete process of this embodiment is:

[0037] Step 1, raw material preparation. A Ti48Al2Cr2Nb alloy test bar of ...

Embodiment 2

[0043] This embodiment is a TiAl alloy grain refinement method.

[0044] TiAl alloys can be divided into three types according to the solidification path, including β solidification, peritectic solidification and α solidification. The solidification path in this embodiment is an α solidification path, and the materials involved are Ti49Al and Ti50Al. In this embodiment, only Ti50Al alloy is taken as an example to describe in detail.

[0045] The solidification path of the Ti50Al alloy is L→L+α→α→α+γ→α 2 +γ, the alloy first forms a solid phase α when it is cooled from the liquid phase, and the α-phase crystals will preferentially grow along their c-axis, easily forming coarse columnar crystals, such as Figure 4 As shown, the lamella clusters formed during the solid-state phase transition process are relatively coarse.

[0046] The concrete process of this embodiment is:

[0047] Step 1, raw material preparation. A Ti50Al alloy test rod of Φ18×20mm was cut by wire cutting....

Embodiment 3

[0052] This embodiment is a TiAl alloy grain refinement method.

[0053] TiAl alloys can be divided into three types according to the solidification path, including β solidification, peritectic solidification and α solidification. The solidification path of this embodiment is a β solidification path, and the materials involved are high niobium titanium aluminum and titanium aluminum alloy with an aluminum content lower than 44%. In this embodiment, only Ti45Al8Nb0.2W0.2B alloy is taken as an example to describe in detail.

[0054] The solidification path of the Ti45Al8Nb0.2W0.2B alloy is L→L+β→β→β+α→α→α 2 +γ, because the columnar grain characteristics of the β-phase solidification structure are weak, it is easy to form relatively fine equiaxed crystals, such as Image 6 shown.

[0055] The concrete process of this embodiment is:

[0056] Step 1, raw material preparation. A Φ18×20mm Ti45Al8Nb0.2W0.2B alloy test rod was cut by wire cutting. The Ti45Al8Nb0.2W0.2B alloy test...

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Abstract

The invention provides a TiAl alloy crystal grain refinement method. Through cyclic treatment in a solid-liquid two-phase region, a bulky columnar crystal undergoes remelting, a fused dendritic crystal can be used as a new nucleation particle which undergoes nucleation and growth, so a crystal grain is refined. According to the invention, treatment is carried out on a peritectic solidification path with a Ti48Al2Cr2Nb alloy as a representative, an alpha solidification path with a Ti50Al alloy as a representative and a beta solidification path with a Ti45Al8Nb0.2W0.2B alloy as a representative, and a substantial refinement effect is obtained; the method has the characteristics of a wide application scope and suitability for crystal grain refinement of a plurality of TiAl alloys.

Description

technical field [0001] The invention relates to the field of metal solidification manufacturing, in particular to a technology for realizing TiAl alloy crystal grain refinement through melt treatment. Background technique [0002] Due to its low density, high specific strength, excellent oxidation resistance and creep resistance, titanium-aluminum-based alloys have broad application prospects in aviation, aerospace, automobiles and other fields. However, the low room temperature plasticity, room temperature fracture toughness, damage tolerance, processability and high cost of TiAl alloy limit its application. [0003] It is well known that the mechanical properties of the alloy are significantly affected by the structure, and the fine grains (sheet clusters) help to improve the shaping and processing properties of titanium-aluminum alloys. At present, the methods for grain refinement of titanium-aluminum alloy mainly include: alloying, heat treatment, adding refiner, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C14/00C22C30/00
Inventor 寇宏超杨光王军李金山胡锐薛祥义
Owner 重庆两航金属材料有限公司
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