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One-step large-deformation rolling method of beta solidification TiAl alloy plate

A technology of alloy sheet and large deformation, which is applied in metal rolling, metal rolling, tool manufacturing, etc., can solve the problems of poor uniformity of sheet structure and performance, difficulty in sheet forming, and many times of reheating, and achieve simplified rolling process, Overcoming the poor thermal processing performance and avoiding the effect of alloy cracking

Active Publication Date: 2018-11-13
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of coarse structure of TiAl alloy rolling stock, difficulty in sheet forming, complex process (small deformation in a single pass, many rolling passes, and many times of returning to the furnace), poor uniformity of sheet structure and performance, etc. in the prior art. Problem, provide a one-step large deformation sheath rolling method for β-solidified TiAl alloy

Method used

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  • One-step large-deformation rolling method of beta solidification TiAl alloy plate
  • One-step large-deformation rolling method of beta solidification TiAl alloy plate
  • One-step large-deformation rolling method of beta solidification TiAl alloy plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1. Preparation of β-solidified TiAl alloy plate of Ti-43Al-2Cr-1Mn-0.5Mo-0.1B

[0043] (1) Raw material preparation: According to the nominal composition of the alloy, select sponge titanium, high-purity aluminum, high-purity chromium, aluminum-manganese alloy, aluminum-molybdenum alloy and boron powder as raw materials and weigh them. The atomic percentage content of each element is: 43 %Al, 2%Cr, 1%Mn, 0.5%Mo, 0.1%B, and the balance is Ti and unavoidable impurities. The principle of raw material ratio is to ensure that the alloy contains about 20% β phase.

[0044] (2) Ingot preparation: put the raw materials prepared in step (1) into a vacuum degree of 2.0×10 -3 Melting in a vacuum induction shell melting furnace of MPa, and then pouring into a cylindrical mold to obtain a TiAl alloy ingot.

[0045] (3) Heat treatment and preprocessing of ingots:

[0046] a. In order to reduce the internal stress caused by the chilling of the ingot, put the TiAl alloy ingo...

Embodiment 2

[0056] Example 2. Preparation of β-solidified TiAl alloy plate of Ti-44Al-2Cr-2Mn-0.5Mo-0.2B

[0057] (1) Raw material preparation: According to the nominal composition of the alloy, select sponge titanium, high-purity aluminum, high-purity chromium, aluminum-manganese alloy, aluminum-molybdenum alloy and boron powder as raw materials and weigh them. The atomic percentage content of each element is: 44 %Al, 2%Cr, 2%Mn, 0.5%Mo, 0.2%B, and the balance is Ti and unavoidable impurities. The principle of raw material ratio is to ensure that the alloy contains about 25% β phase.

[0058] (2) Ingot preparation: put the raw materials prepared in step (1) into a vacuum degree of 2.5×10 -3 Melting in a vacuum induction shell melting furnace of MPa, and then pouring into a cylindrical mold to obtain a TiAl alloy ingot.

[0059] (3) Heat treatment and preprocessing of ingots:

[0060] a. In order to reduce the internal stress caused by the chilling of the ingot, put the TiAl alloy ingo...

Embodiment 3

[0069] Example 3. Preparation of β-solidified TiAl alloy plate of Ti-42Al-1Cr-0.5Mn-1Mo-0.5B

[0070] (1) Raw material preparation: According to the nominal composition of the alloy, select sponge titanium, high-purity aluminum, high-purity chromium, aluminum-manganese alloy, aluminum-molybdenum alloy and boron powder as raw materials and weigh them. The atomic percentage content of each element is: 42 %Al, 1%Cr, 0.5%Mn, 1%Mo, 0.5%B, and the balance is Ti and unavoidable impurities. The principle of raw material ratio is to ensure that the alloy contains about 15% β phase.

[0071] (2) Ingot preparation: put the raw materials prepared in step (1) into a vacuum degree of 3×10 -3 Melting in a vacuum induction shell melting furnace of MPa, and then pouring into a cylindrical mold to obtain a TiAl alloy ingot.

[0072] (3) Heat treatment and preprocessing of ingots:

[0073] a. In order to reduce the internal stress caused by the chilling of the ingot, put the TiAl alloy ingot ...

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Abstract

The invention provides a one-step large-deformation rolling method of a beta solidification TiAl alloy plate. The method comprises the following steps that 1, raw materials are weighed; 2, a TiAl alloy casted ingot is manufactured by utilizing a vacuum induction melting technology, and heat treatment is carried out; 3, two-step hot extrusion deformation is carried out on the alloy; and 4, one-steplarge-deformation packing rolling is carried out on the alloy, and a pack is removed so as to obtain the TiAl alloy plate which is uniform and fine in structure. According to the one-step large-deformation rolling method of the beta solidification TiAl alloy plate, the beta solidification TiAl alloy with excellent high-temperature deformation capability is adopted, the beta phase content is controlled to be 15%-25%, and the excellent high-temperature deformation capability of the TiAl alloy is ensured; meanwhile, the alloy structure of a blank is refined violently through the two-step extrusion so as to remarkably improve the structure uniformity of the alloy, and therefore, one-step large-deformation rolling of the blank can be guaranteed, finally, the TiAl alloy plate with the uniform and fine structure and good room temperature plasticity is obtained, and the problems that in the prior art, a TiAl alloy rolled blank is coarse in structure, plate forming is difficult, and the platestructure uniformity is poor are solved.

Description

technical field [0001] The invention belongs to the technical field of TiAl alloys, and in particular relates to a one-step large-deformation rolling method for β-solidified TiAl alloy plates. Background technique [0002] TiAl alloy has many advantages such as low density, high strength, good oxidation resistance and creep resistance. It is a new type of lightweight high-temperature structural material with broad application prospects in the field of aviation and aerospace. The use of TiAl alloys to replace Ni-based superalloys in aviation and aerospace engines can effectively reduce the weight of the engine and increase the thrust-to-weight ratio of the engine. At present, great breakthroughs have been made in the preparation technology of TiAl alloy castings and forgings. For example, the American boeing company announced in 2007 that the cast TiAl alloy was used to prepare the low-pressure turbine blades of the boeing 787 aircraft; The wrought γ-TiAl alloy developed by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B3/00B21B15/00C21D9/46C22C21/00
CPCB21B3/00B21B15/0007B21B15/0035B21B15/005B21B2003/001B21B2015/0078C21D9/46C22C21/003
Inventor 崔宁武倩倩王进李一楠徐铁伟吕滨江车清论徐洋
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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