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Preparation method for TiAl-Ni alloy plate with high strength and toughness and high stability

A high-stability technology for alloy plates, which is applied in the direction of metal rolling, can solve problems such as rough and uneven structure of rolled billets, poor stability of plate structure and performance, and unstable rolling process, and achieve fine alloy microscopic Microstructure, improvement of high temperature deformation ability, effect of improvement of high temperature deformation ability and room temperature performance

Active Publication Date: 2020-01-03
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problems of difficult preparation, high cost and poor mechanical properties of the powder metallurgy method, as well as the rough and uneven structure of the rolled billet by the ingot metallurgy method, the unstable rolling process, and the poor stability of the plate structure and performance, etc., and provides a high-strength Preparation method of tough and high stability TiAl-Ni alloy plate

Method used

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  • Preparation method for TiAl-Ni alloy plate with high strength and toughness and high stability
  • Preparation method for TiAl-Ni alloy plate with high strength and toughness and high stability
  • Preparation method for TiAl-Ni alloy plate with high strength and toughness and high stability

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Experimental program
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Effect test

Embodiment 1

[0045] Test one:

[0046] The preparation method of Ti-43Al-4Mo-2V-0.2Ni-(B, Y) alloy plate is as follows:

[0047] Step 1, weighing raw materials:

[0048] According to the atomic percentage of each component, the alloy composition is 43% Al, 4% Mo, 2% V, 0.2% Ni and 0.1% X (X is a 1:1 combination of B and Y elements), and the balance Ti and inevitable impurity elements. Weigh high-purity titanium sponge, high-purity aluminum, aluminum-molybdenum alloy (57.43% Mo content), aluminum-vanadium alloy (53.25% V content), aluminum-yttrium alloy (87.3% Y content), high-purity nickel powder (99.9% ), a total of 20Kg of boron powder as raw materials.

[0049] Step 2. Ingot melting and casting:

[0050] The high-purity titanium sponge, high-purity aluminum, aluminum-molybdenum alloy, aluminum-vanadium alloy, aluminum-yttrium alloy, high-purity nickel powder, and boron powder weighed in step 1 are added to a 20kg water-cooled copper crucible for melting in a vacuum induction shell m...

Embodiment 2

[0077] The preparation method of Ti-47Al-2Nb-2Cr-2V-2Ni-(B, C) alloy plate is as follows:

[0078] Step 1, weighing raw materials:

[0079] According to the atomic percentage of each component, the alloy composition is 47% Al, 2% Nb, 2% Cr, 2% V, 2% Ni and 0.5% X (X is a 1:1 combination of B and C elements ), the balance is Ti and unavoidable impurity elements. Weigh high-purity titanium sponge, high-purity aluminum, aluminum-niobium alloy (Nb content is 54.56%), high-purity chromium (Cr content is 99.99%), aluminum-vanadium alloy (V content is 53.25%), high-purity nickel powder (99.9% ), boron powder and carbon powder total 20Kg as raw materials.

[0080] Step 2, ingot melting and casting: same as embodiment 1.

[0081] Step three, billet pretreatment one:

[0082] a. Remove the riser of the TiAl alloy ingot and perform hot isostatic pressing treatment. The treatment process is 1280 ° C, 150 MPa, protected by argon atmosphere, kept for 4 hours, and cooled with the furnace...

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Abstract

The invention relates to the field of preparation of alloy materials, in particular to a preparation method for a TiAl-Ni alloy plate with high strength and toughness and high stability. The preparation method aims to solve the problems of uneven structure and poor mechanical properties caused by excessive grain growth and process heredity of a TiAl alloy plate material prepared through existing ingot metallurgy and powder metallurgy methods, especially the problems of low strength and plasticity. The preparation method comprises the following steps of 1, weighing raw materials; 2, smelting acast ingot; 3, carrying out primary pretreatment on a blank; 4, carrying out secondary pretreatment on the blank; 5, carrying out jacketing and hot rolling; 6, carrying out stabilizing treatment; and7, removing a jacket so as to obtain the TiAl alloy plate. The plate obtained through the preparation method has the advantages of being good in surface quality, fine and uniform in structure, good inmechanical property and high in repeatability.

Description

technical field [0001] The invention relates to the field of preparation of alloy materials, in particular to a preparation method of a high-strength, toughness and high-stability TiAl-Ni alloy plate. Background technique [0002] TiAl alloy (γ-TiAl-based intermetallic compound), as a new type of high-temperature light-weight structural material, has the characteristics of both metal and ceramics, has high specific strength and specific stiffness, excellent oxidation resistance and creep resistance, and its plate It has broad application prospects in the fields of hypersonic vehicle skins, aerospace vehicle thermal protection systems, and weapon pylon wall panels. However, TiAl alloy has few slip systems, difficulty in dislocation activation, poor plastic deformation ability, and high resistance to hot deformation deformation, which become the bottleneck restricting the rolling of TiAl alloy sheet. [0003] At present, the preparation methods of TiAl alloy plates mainly inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C21/00C22F1/04C22F1/18B21B3/00B21C37/02
CPCB21B3/00B21B2003/001B21C37/02C22C14/00C22C21/003C22F1/04C22F1/183
Inventor 韩建超贾燚王涛任忠凯姚昊明张树志张长江
Owner TAIYUAN UNIV OF TECH
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