High-strength titanium alloy and preparation method thereof

A titanium alloy, high-strength technology, applied in the field of high-strength titanium alloy and its preparation, can solve the problems of limited wide application, cumbersome process and high cost

Active Publication Date: 2018-12-11
YANSHAN UNIV
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  • Abstract
  • Description
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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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  • High-strength titanium alloy and preparation method thereof

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[0034] The present invention also provides a method for preparing the high-strength titanium alloy described in the above technical solution, comprising the following steps:

[0035] (1) Obtain the as-cast alloy billet after melting the alloy raw material;

[0036] (2) deforming the as-cast alloy billet obtained in the step (1) after heat preservation treatment to obtain a densified alloy billet;

[0037] (3) performing solution treatment on the densified alloy billet obtained in the step (2) to obtain a high-strength titanium alloy.

[0038] 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 wire (99.9wt.%), molybdenum wir...

Embodiment 1

[0053] According to the alloy composition Ti-10Zr-0.3Mo-0.8Ni (mass percentage) ingredients, weigh industrial grade sponge zirconium, titanium wire (99.9wt.%), molybdenum wire (99.7wt.%), pure nickel (99.8wt.%) ) in anhydrous ethanol, after ultrasonic cleaning, air-dried, then placed in a water-cooled copper crucible in a non-consumable vacuum arc melting furnace, the inner wall of the copper crucible should be cleaned and wiped clean in advance to avoid bringing in other impurities The vacuum inside 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 smelting-casting ingot is repeatedly smelted and turned over 5 times to ensure that the finally obtai...

Embodiment 2

[0058] According to the alloy composition Ti-30Zr-0.3Mo-0.8Ni (mass percentage) ingredients, weigh industrial grade sponge zirconium, titanium wire (99.9wt.%), molybdenum wire (99.7wt.%), pure nickel (99.8wt.%) ) in anhydrous ethanol, after ultrasonic cleaning, air-dried, then placed in a water-cooled copper crucible in a non-consumable vacuum arc melting furnace, the inner wall of the copper crucible should be cleaned and wiped clean in advance to avoid bringing in other impurities The vacuum inside 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 smelting-casting ingot is repeatedly smelted and turned over 5 times to ensure that the finally obtai...

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Abstract

The invention provides a high-strength titanium alloy and a preparation method thereof. The high-strength titanium alloy comprises 0.2 to 0.4% of Mo, 0.6 to 0.9% of Ni, (0,50%] of Zr and the balance of Ti. According to the high-strength titanium alloy, by alloying, the element Mo, the element Ni and the element Zr are added into matrix titanium. In the alloy, adding of the Zr element can cause lattice distortion, the defects can cause increase of nucleation points in the nucleation process, and density increase of nucleation takes a grain refining effect so as to realize fine-grain strengthening. An experiment result shows that the high-strength titanium alloy provided by the invention has yield strength of 621 to 816MPa and tensile strength of 712 to 920MPa, and keeps a considerable levelof elongation percentage.

Description

technical field [0001] The invention relates to the technical field of titanium alloys, in particular to a 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 powder metallurg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C16/00C22C30/00C22C1/02C22F1/18
Inventor 刘日平陈博涵马巍张星马明臻景勤张新宇
Owner YANSHAN UNIV
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