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TiAl alloy sheet "heat-electricity" coupled canning-free preparation method

An alloy sheet and sheathing technology is applied in the field of "thermo-electric" coupling non-cladding preparation of TiAl alloy sheets, which can solve the problems of poor plate uniformity and mechanical properties, low material utilization rate, and poor deformation coordination, etc. High-quality rolling, improvement of composition and grain size inhomogeneity, and effect of grain refinement

Active Publication Date: 2019-12-20
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention aims at the problems of complex process, high cost of sheathing, poor deformation coordination and low material utilization rate of ingot metallurgy clad rolling method, and difficult problems of powder metallurgy and foil metallurgy composition control, plate uniformity and poor mechanical properties , providing a "thermo-electric" coupling uncoated preparation method for a TiAl alloy sheet

Method used

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  • TiAl alloy sheet "heat-electricity" coupled canning-free preparation method

Examples

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Embodiment 1

[0039] The preparation method of Ti-44Al-8Nb-(B, Y) alloy plate "thermo-electric" coupling without jacket is as follows:

[0040] Step 1, weighing raw materials:

[0041]According to the atomic percentage of each component, the alloy composition is 44% Al, 8% Nb, 0.1% X (X is a 1:1 combination of B and Y elements), and the balance is Ti and unavoidable impurity elements. Weigh high-purity titanium sponge, high-purity aluminum, aluminum-niobium alloy (with a Nb content of 54.56%), aluminum-yttrium alloy (with a Y content of 87.3%), and a total of 10Kg of boron powder as raw materials.

[0042] Step 2. Ingot melting and casting:

[0043] The high-purity sponge titanium, high-purity aluminum, aluminum-niobium alloy, aluminum-yttrium alloy, and boron powder weighed in step 1 are added to a water-cooled copper crucible for melting in a vacuum induction shell melting furnace. The melting atmosphere is an argon atmosphere, and the argon pressure is 0.95~1MPa, the mass purity of arg...

Embodiment 1

[0058] The TiAl alloy sheet material surface quality that embodiment 1 step 5 obtains is good, without obvious crack, as figure 1 shown.

Embodiment 2

[0060] The preparation method of Ti-43Al-4Nb-2Mo-2V-0.5Ni alloy plate "thermo-electric" coupling without jacket is as follows:

[0061] Step 1, weighing raw materials:

[0062] According to the atomic percentage of each component, the alloy composition is 43% Al, 4% Nb, 2% V, 2% Mo, 0.5% Ni, and the balance is Ti and unavoidable impurity elements. Weigh high-purity titanium sponge, high-purity aluminum, aluminum-niobium alloy (Nb content is 54.56%), aluminum-molybdenum alloy (Mo content is 55.35%), aluminum-vanadium alloy (V content is 52.12%), and high-purity nickel powder in total 15Kg as raw material.

[0063] Step 2. Ingot melting and casting:

[0064] Add the high-purity sponge titanium, high-purity aluminum, aluminum-niobium alloy, aluminum-molybdenum alloy, aluminum-vanadium alloy, and high-purity nickel powder weighed in step 1 into a water-cooled copper crucible for melting in a vacuum induction shell melting furnace, and pour the melt to 500 In the metal casting m...

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Abstract

The invention relates to the field of preparation of alloy materials, in particular to a TiAl alloy sheet "heat-electricity" coupled canning-free preparation method. The method aims to solve the problems of complex process, high cost, poor plate shape and low material utilization rate of existing ingot metallurgy canning rolling method for a TiAl alloy sheet, and overcomes the problems of high impurity content, high cost, low density and low production efficiency of a powder metallurgy method. The method comprises the following specific steps of 1, weighing the raw material components; 2, carrying out vacuum induction skull melting+metal mold casting to prepare an ingot; 3, carrying out blank pretreatment I; 4, carrying out blank pretreatment II; and 5, carrying out "heat-electricity" coupled canning-free rolling on the sheet to obtain the TiAl alloy sheet. According to the method, the obtained sheet is good in surface quality, free of oxidation layer falling, free of cracking at the edge part and the end part, uniform and fine in sheet tissue, and good in mechanical property.

Description

technical field [0001] The invention relates to the field of preparation of alloy materials, in particular to a "thermo-electric" coupling non-sheathing preparation method of a TiAl alloy plate. Background technique [0002] As a new type of high-temperature structural material with light weight, high specific strength, good high-temperature oxidation resistance and creep resistance, TiAl alloy sheet has great application prospects in aerospace fields such as the thermal protection system of space-to-ground aircraft and the skin of supersonic aircraft. . However, due to the intrinsic brittleness of intermetallic compounds, the poor high-temperature deformability and narrow thermal processing window of TiAl alloys limit the development and engineering applications of TiAl alloys. [0003] Existing methods for preparing TiAl alloy plates mainly include ingot metallurgy, powder metallurgy, and foil metallurgy. The ingot metallurgy method realizes the rolling of TiAl alloy pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C30/00C22C1/03C22F1/18C22F1/02
CPCC22C1/03C22C14/00C22C30/00C22F1/02C22F1/183
Inventor 韩建超王涛任忠凯贾燚刘志栋锅渺张长江张树志
Owner TAIYUAN UNIV OF TECH
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