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Recrystallizing high-strength titanium alloy and preparation method thereof

A recrystallization and titanium alloy technology, applied in the field of titanium alloy, can solve the problems of restricting wide application, cumbersome process and high cost

Active Publication Date: 2018-12-11
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the patent adopts both smelting and powder metallurgy technologies, the process is complex and the cost is high
For another example, Chinese patent CN97119996.5 belongs to the technical field of metal heat treatment. First, the titanium-aluminum alloy casting is subjected to high-temperature treatment in the α phase region by hot isostatic pressing, followed by cyclic heat treatment and eutectoid temperature isothermal treatment, and finally critical temperature However, this solution requires the simultaneous use of smelting, hot isostatic pressing and cyclic heat treatment technologies, with complex procedures and high costs
Not only the existing titanium alloy preparation method is cumbersome, but also the strength performance of the titanium alloy obtained by this method is still difficult to meet the increasingly stringent industrial service standards, which limits the wide application

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  • Recrystallizing high-strength titanium alloy and preparation method thereof
  • Recrystallizing high-strength titanium alloy and preparation method thereof
  • Recrystallizing high-strength titanium alloy and preparation method thereof

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[0037] The present invention also provides a method for preparing the recrystallized high-strength titanium alloy described in the above technical solution, comprising the following steps:

[0038] (1) Obtain the as-cast alloy billet after melting the alloy raw material;

[0039] (2) deforming the as-cast alloy billet obtained in the step (1) after heat preservation treatment to obtain a densified alloy billet;

[0040] (3) The densified alloy billet obtained in the step (2) is subjected to solution treatment to obtain a recrystallized high-strength titanium alloy.

[0041]In the invention, the alloy raw material is smelted to obtain the cast alloy billet. In the present invention, there is no special limitation on the type of the alloy raw material, and the alloy raw material well-known to those skilled in the art is used to obtain the titanium alloy with the target composition. In the present invention, the alloy raw materials preferably include zirconium sponge, titanium ...

Embodiment 1

[0056] According to the alloy composition Ti-10Zr-5.5Al-4Sn-1Mo-1Nd-0.25Si (mass percentage) ingredients, weigh industrial grade sponge zirconium, titanium wire (99.9%), molybdenum wire (99.7%), aluminum wire (99.7%) ), pure tin (99.8%), silicon powder (99.6%), neodymium-containing rare earth immersed in absolute ethanol, after ultrasonic cleaning, air-dried, placed in a water-cooled copper crucible of a non-consumable vacuum arc melting furnace, the copper crucible The inner wall should be cleaned and wiped clean in advance to avoid bringing in other impurities, and the vacuum in the furnace cavity should be pumped to 8×10 -3 Below Pa, after filling high-purity argon as a protective gas (vacuum degree 0.04-0.05MPa) before arc smelting, the arc temperature is about 2000°C during each smelting, and the smelting time is about 4 minutes each time. After the smelting is completed, the ingot is cooled to obtain the ingot, and then the ingot is turned over for smelting, so that the ...

Embodiment 2

[0061] According to the alloy composition Ti-30Zr-5.5Al-4Sn-1Mo-1Nd-0.25Si (mass percentage) ingredients, weigh industrial grade sponge zirconium, titanium wire (99.9%), molybdenum wire (99.7%), aluminum wire (99.7%) ), pure tin (99.8%), silicon powder (99.6%), neodymium-containing rare earth immersed in absolute ethanol, after ultrasonic cleaning, air-dried, placed in a water-cooled copper crucible of a non-consumable vacuum arc melting furnace, the copper crucible The inner wall should be cleaned and wiped clean in advance to avoid bringing in other impurities, and the vacuum in the furnace cavity should be pumped to 8×10 -3 Below Pa, after filling high-purity argon as a protective gas (vacuum degree 0.04-0.05MPa) before arc smelting, the arc temperature is about 2000°C during each smelting, and the smelting time is about 4 minutes each time. After the smelting is completed, the ingot is cooled to obtain the ingot, and then the ingot is turned over for smelting, so that the ...

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Abstract

The invention provides a recrystallizing titanium alloy and a preparation method thereof. The high-strength titanium alloy is prepared from the following components of 4.5 to 6.0% of Al (aluminum), 3.7 to 4.7% of Sn (stannum), 0.75 to 2.0% of Mo (molybdenum), 0.2 to 0.35% of Si (silicon), 0.6 to 1.2% of Nd (neodymium), 5 to 50% of Zr (zirconium) and the balance of Ti (titanium). The recrystallizing high-strength titanium alloy has the advantages that after alloying, the crystal lattice is distorted due to the adding of the Zr element, the number of nucleation points is increased in the nucleation process due to the defects, the density of nucleation is increased, the refining function of crystal grains is realized, and the refining of crystals is reinforced; proofed by experiment results,compared with the contrast alloy with yield strength of 880MPa and the tensile strength of 1020MPa, the recrystallizing high-strength titanium alloy has the yield strength of 963 to 1130MPa and the tensile strength of 1100 to 1280MPa, and maintains the equivalent elongation rate.

Description

technical field [0001] The invention relates to the technical field of titanium alloys, in particular to a recrystallized high-strength titanium alloy and a preparation method thereof. Background technique [0002] Titanium and titanium alloys are widely used in marine engineering, aerospace, biomedical engineering, metallurgy, chemical industry, light industry and many other fields. With the widespread application of titanium and titanium alloys, the development of industry and the service environment have put forward more stringent requirements on the performance of titanium alloys. It is difficult for traditional titanium alloys to meet the current engineering application standards in terms of strength and corrosion resistance. The high-strength titanium corrosion-resistant alloy is one of the key directions of research, development and application at present. [0003] For example, Chinese patent CN01140046.3 discloses a titanium-aluminum alloy prepared by smelting and p...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C16/00C22C1/02C22C30/04C22F1/00C22F1/18
Inventor 刘日平马巍张星王飞马明臻张新宇
Owner YANSHAN UNIV
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