Six-element intermediate alloy for preparation of high-strength titanium alloy and preparation method thereof

A technology for master alloys and titanium alloys, applied in the field of alloy additives, which can solve the problems of difficulty in quality defects, difficulty in controlling smelting current, and inability to meet the requirements of composition ratio.

Inactive Publication Date: 2015-06-03
宝钢特钢有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because its main alloying elements generally contain high melting point elements such as Mo, V, Cr, Nb, etc., if these elements are added in the form of simple metal, the melting rate of each raw material in the electrode block will be different due to the difference in melting point during smelting, which will easily lead to If the electrode falls off, it is difficult to control the melting current, which affects the stability of the melting process
In addition, at present, titanium alloys mainly use vacuum self-consumption to smelt ingots. Due to the limitation of the size of the molten pool, elements with high melting points and high densities such as Mo, V, Cr,

Method used

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  • Six-element intermediate alloy for preparation of high-strength titanium alloy and preparation method thereof
  • Six-element intermediate alloy for preparation of high-strength titanium alloy and preparation method thereof
  • Six-element intermediate alloy for preparation of high-strength titanium alloy and preparation method thereof

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preparation example Construction

[0025] The preparation method of the six-element master alloy is as follows:

[0026] The ratio of raw materials for the production of products ranges from Al: 100 to 230 parts, MoO 3 : 125~145 copies, V 2 o 5 : 125~175 parts, Cr: 0~65 parts, Fe: 0~35 parts, CaF 2 : 15-45 parts, TiO 2 : 15-165 parts.

[0027] During production, firstly mix the raw materials uniformly according to the above ratio, put them into the reaction container, then start the ignition device to ignite in the reaction container, and carry out the aluminothermic chemical reaction smelting. The thermite smelting is carried out under the protection of helium, and the ingots obtained from the smelting are finished, broken, and selected to make finished products with a particle size of 0.05-6mm, and then sampled for inspection and packaged for storage.

[0028] When users or standards have high requirements on the uniformity of product composition and require vacuum induction melting, after the above-ment...

Embodiment 1

[0037] Al, MoO 3 , V 2 o 5 , Cr, Fe, CaF 2 、TiO 2 As raw material, according to the ratio of 150: 139: 165: 62: 6.3: 30: 153 parts, mix evenly, obtain alloy ingots through aluminothermic reaction, and make 0.05 ~ 6mm particle size through finishing, crushing, selection and other processes finished product. The measured composition content of the finished product is: Ti: 21.05%, Al: 23.16%, Mo: 21.89%, V: 21.89%, Cr: 10.53%, Fe: 1.47%, and the rest are impurities. The master alloy and sponge titanium, TiO 2 After the raw materials are mixed according to the mixing point required by the product standard, the titanium alloy electrode for vacuum self-consumption smelting is made through the steps of raw material stirring, mold extrusion and electrode block welding, and the composition is Ti- 5.2Al-5.2Mo-5.2V-2.5Cr-0.35Fe-0.16O multi-element high-strength high-toughness titanium alloy with high content, its microstructure after forging and heat treatment is as follows: imag...

Embodiment 2

[0039] Al, MoO 3 , V 2 o 5 , Cr, Fe, CaF 2 、TiO 2 As raw material, according to the ratio of 120:131:159:41:6.2:35:102 parts, mix evenly, obtain alloy ingots through aluminothermic reaction, and make 0.05 ~ 6mm particle size through finishing, crushing, selection and other processes finished product. The measured composition content of the finished product is: Ti: 14.19%, Al: 26.49%, Mo: 23.18%, V: 23.65%, Cr: 10.88%, Fe: 1.61%, and the rest are impurities. The master alloy and sponge titanium, sponge zirconium, TiO 2 After the raw materials are mixed according to the mixing point required by the product standard, the titanium alloy electrode for vacuum self-consumption smelting is made through the steps of raw material stirring, mold extrusion and electrode block welding, and the composition is Ti- 5.3Al-4.9Mo-5.0V-2.3Cr-1.0Zr-0.34Fe-0.11O high-strength and high-toughness titanium alloy with high multi-element content, its microstructure after forging and heat treatment...

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Abstract

The invention discloses a six-element intermediate alloy for preparation of a high-strength titanium alloy. The six-element intermediate alloy comprises, by weight, 19-27% of Al, 20-25% of Mo, 20-25% of V, 8-16% of Cr, 0.8-3% of Fe and the balance Ti. The invention also discloses a preparation method of the six-element intermediate alloy for preparation of a high-strength titanium alloy. The high-strength high-toughness titanium alloy prepared from the six-element intermediate alloy has high strength and good plasticity, can substantially reduce hidden trouble caused by incomplete melting of high-melting point elements such as Mo, V and Cr in melting and ingot casting, improves ingot casting purity and component uniformity and prevents quality defects caused by high density inclusion and beta spots.

Description

technical field [0001] The invention relates to alloy additives, more specifically to a six-element master alloy for preparing high-strength titanium alloys and a preparation method thereof. Background technique [0002] With the rapid development of the aviation industry, the demand for titanium alloys is increasing. In order to meet the requirements of the aviation industry for weight loss, corrosion resistance, durability and low cost of structural materials, titanium alloys for aviation structures tend to be high-strength, high-toughness, and high-hardenability. As well as the design of damage tolerance, the composition elements of titanium alloys also tend to be diversified and high-content. Because its main alloying elements generally contain high melting point elements such as Mo, V, Cr, Nb, etc., if these elements are added in the form of simple metal, the melting rate of each raw material in the electrode block will be different due to the difference in melting poin...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/03C22B5/04
Inventor 徐锋闵新华杨昭
Owner 宝钢特钢有限公司
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