Method for smelting large-sized titanium-nickel-based shape memory alloy ingot

A memory alloy and large-scale technology, which is applied in the field of manufacturing large-scale ingots of titanium-nickel-based shape memory alloys, can solve problems such as difficulty in welding titanium-nickel alloys, large differences in titanium-nickel density, and influence on phase transition temperature Secondary electrode welding problem, high yield and good uniformity

Inactive Publication Date: 2014-03-26
西安思维智能材料有限公司
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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 overcome the shortcomings of the above problems, aiming at proposing a novel smelting method of titanium-nickel alloy, which solves the problems of welding difficulty of titanium-nickel alloy, large difference in titanium-nickel density, easy segregation and serious influence on phase transition temperature. Problems, achieve the characteristics of uniform composition, single weight, and high yield, thereby reducing the loss of titanium-nickel-based alloys in the smelting process and finished risers

Method used

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  • Method for smelting large-sized titanium-nickel-based shape memory alloy ingot
  • Method for smelting large-sized titanium-nickel-based shape memory alloy ingot
  • Method for smelting large-sized titanium-nickel-based shape memory alloy ingot

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Embodiment 1

[0019] The selected composition is Ni: 56wt.%, Ti: 44wt.% binary nickel-titanium memory alloy, the raw materials are 0 grade sponge titanium and 1# electrolytic nickel, weigh 56kg electrolytic nickel and 44kg sponge titanium (three groups), each One group is all loaded into the crucible of the vacuum intermediate frequency induction melting furnace. After evacuation (the pressure is less than 0.1pa), turn on the electric heating, heat the raw materials to between 1300°C and 1800°C to melt them all, and keep them for 15 to 60 minutes for refining. It is then poured into a circular mold, and the primary ingot is taken out after cooling, and the three primary ingots are pressed into figure 2 Cut the size of medium and round ingots, and then press image 3 The cloth is welded to form the secondary electrode. Then, use a vacuum consumable electrode arc melting furnace to melt the secondary electrode, and finally the riser part adopts the feeding process of conventional titanium ...

Embodiment 2

[0023] The selected composition is Ni: 55wt.%, Ti: 46wt.% binary nickel-titanium memory alloy, the raw materials are 0 grade sponge titanium and 1# electrolytic nickel, weigh 55kg electrolytic nickel and 46kg sponge titanium (three groups), each One group is all loaded into the crucible of the vacuum intermediate frequency induction melting furnace. After evacuation (the pressure is less than 0.1pa), turn on the electric heating, heat the raw materials to between 1300°C and 1800°C to melt them all, and keep them for 15 to 60 minutes for refining. Then it is poured into a square mold, and the primary ingot is taken out after cooling, and the three primary ingots are pressed into figure 2 Cut the size of the square ingot, and then press image 3 The cloth is welded to form the secondary electrode. Then, use a vacuum consumable electrode arc melting furnace to melt the secondary electrode, and finally the riser part adopts the feeding process of conventional titanium alloy mel...

Embodiment 3

[0027] The selected composition is Ni: 55.5wt.%, Ti: 44.2wt.%, Cr: 0.3wt.% ternary nickel-titanium memory alloy, the raw materials are 0-grade sponge titanium, 1# electrolytic nickel and electrolytic chromium, weighing 55.5kg Electrolytic nickel, 44.2 kg of titanium sponge and 0.3 kg of electrolytic chromium (three groups), each group is fully loaded into the crucible of the vacuum intermediate frequency induction melting furnace. After evacuation (the pressure is less than 0.1pa), turn on the electric heating, heat the raw materials to between 1300°C and 1800°C to melt them all, and keep them for 15 to 60 minutes for refining. It is then poured into a circular mold, and the primary ingot is taken out after cooling, and the three primary ingots are pressed into figure 2 Cut the size of medium and round ingots, and then press image 3 The way cloth is welded to form the secondary electrode. Then, use a vacuum consumable electrode arc melting furnace to melt the secondary ele...

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Abstract

The invention relates to a method for smelting a large-sized titanium-nickel-based shape memory alloy ingot. The method is characterized in that vacuum medium-frequency induction smelting and vacuum consumable electrode electric arc smelting are adopted. According to the method disclosed by the invention, a primary ingot is molded by casting to be square or cylindrical shape via primary smelting through vacuum medium-frequency induction, and the two ends of the ingot are cut, so that the problem of direct welding of a titanium-nickel alloy is solved, and the phenomenon of dropping caused by fall of welding points in a secondary smelting process can be avoided; in secondary smelting distribution, the head and tail of the primary ingot are buckled, secondary smelting is performed by adopting vacuum consumable electrode electric arc smelting after spot welding is performed on joints, and a reasonable feeding process is adopted at the end of smelting, thereby the riser depth of the ingot is reduced. Segregation of nickel element in a solidifying process is reduced via the primary smelting, the phenomenon of off caused by separation of a smelting electrode can be avoided via the secondary smelting, a larger-size ingot can be made, and the components of the final ingot are uniform.

Description

technical field [0001] The invention relates to a method for melting a large-scale ingot of a titanium-nickel-based shape memory alloy, in particular to a method for obtaining a large-scale ingot of a titanium-nickel-based shape memory alloy with uniform composition by means of vacuum intermediate frequency induction melting and vacuum consumable electrode arc melting manufacturing method. Background technique [0002] Titanium-nickel-based shape memory alloy has a unique shape memory effect and superelasticity, excellent wear resistance, corrosion resistance and damping properties, and good mechanical properties. It has a wide range of applications, involving machinery, electronics, chemical industry, energy, construction, and medical treatment. and aerospace fields. In the manufacture of titanium-nickel-based shape memory alloy materials, the acquisition of ingots is the first step in material manufacturing. The uniformity of ingot composition, size and yield are all impo...

Claims

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Application Information

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IPC IPC(8): C22C19/03C22C1/02C22B9/20
CPCY02P10/25
Inventor 贾兵然牛中杰雷亚军薛飒于孟胡琦罗斌莉田成民
Owner 西安思维智能材料有限公司
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