High-intensity, high-toughness and corrosion-resistant titanium alloy and preparation method thereof

A high-strength, high-toughness, titanium alloy technology, applied in the field of alloys, can solve the problems of marine equipment service safety, hidden dangers in reliability, low plasticity and fracture toughness, etc. The effect of processability

Active Publication Date: 2019-01-08
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the main representative high-strength titanium alloys at home and abroad include Ti62222S, BT22, Ti1023, TB2 and TB10, etc. These alloys have high tensile strength, but low plasticity and fracture toughness, which cannot meet the special operating conditions of the marine environment, such as some An important reason for marine accidents on ships is due to the brittleness of materials.
This poses a major hidden danger to the service safety and reliability of marine equipment. Therefore, it is necessary to develop a new type of high-strength, high-toughness and corrosion-resistant titanium alloy with good comprehensive properties such as fracture toughness, tensile strength, seawater corrosion resistance and yield strength.

Method used

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  • High-intensity, high-toughness and corrosion-resistant titanium alloy and preparation method thereof

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Effect test

preparation example Construction

[0021] The preparation of the high-strength and high-toughness corrosion-resistant titanium alloy of the present invention comprises the following steps:

[0022] Step 1: Alloy composition ingredients: niobium, molybdenum, vanadium, and tantalum elements are added in the form of master alloys, zirconium and aluminum elements are added in the form of pure metals, according to the preset formula, that is, α-stable element Al: 3.0~7.0%, β-stable elements (Mo+Nb+V): 2.0~6.0%, Ta: 0.01~6.0%; neutral element Zr: 0.5~3.5%, weigh the ingredients, mix them thoroughly, and press them into electrodes.

[0023] Step 2: Ingot smelting: The ingot is prepared by vacuum consumable arc melting technology, and the pre-melting vacuum degree should reach 1Pa. In order to ensure uniform alloy composition, the number of smelting times is ≥ 3 times, and the arcing stage of ingot smelting is controlled at 2 -6min or so, the current in the normal smelting stage is above 2000A, and the time is 15-20min...

Embodiment 1

[0027] Example 1: Ti-3Al-1Zr-3Mo-1V-0.01Ta alloy

[0028] According to the mass percentage of each element composition, the element composition is weighed and proportioned; each element composition and its mass percentage are as follows: 3wt.% aluminum element, 3wt.% Mo element, 1wt.% zirconium element, 1wt.% Vanadium element, 0.01wt.% tantalum element, and the balance is industrial grade 1 sponge titanium; after weighing, it is melted into an alloy ingot three times by mixing materials, pressing electrode rods, and vacuum consumable electric arc furnace. T β +150°C blanking, α+β phase zone forging into forgings, rolling into wide sheets with different thicknesses by hot and cold rolling mills. After being treated by the heat treatment system, the properties of the alloy material are shown in Table 1.

Embodiment 2

[0029] Example 2: Ti-4Al-5 Nb -0.5Zr -1Mo alloy

[0030] According to the mass percentage of each element composition, the element composition is weighed and proportioned; each element composition and its mass percentage are as follows: 4wt.% aluminum element, 1wt.% Mo element, 0.5wt.% zirconium element, 5wt.% Niobium element, the balance is industrial grade 1 sponge titanium, after weighing, it is melted into alloy ingot three times by mixing materials, pressing electrode rods, and vacuum consumable electric arc furnace. via T β +150°C blanking, α+β phase zone forging into forgings, rolling into wide sheets with different thicknesses by hot and cold rolling mills. After being treated by the heat treatment system, the properties of the alloy material are shown in Table 1.

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Abstract

The invention relates to a high-intensity, high-toughness and corrosion-resistant titanium alloy and a preparation method thereof, and belongs to the field of alloys. The titanium alloy is prepared from the following element components (in percentage by mass): 3.0 to 7.0 percent of Al; 2.0 to 6.0 percent of a beta-stable element (Mo+Nb+V), 0.01 to 6.0 percent of Ta, 0.5 to 3.5 percent of Zr and the balance of Ti and unavoidable impurities. The performance of the alloy is as follows: Rp0.2 is greater than or equal to 840 MPa, Rm is greater than or equal to 940 MPa, A is greater than or equal to8 percent, KIC is greater than or equal to 110 MPa.m<1/2>, KISCC is greater than or equal to 100 MPa.m<1/2>, and KV2 is greater than or equal to 60J. The alloy has good technology application and market prospects in the field of ship, marine engineering and the like.

Description

technical field [0001] The invention belongs to the field of alloys, and in particular relates to a high-strength, high-toughness, corrosion-resistant titanium alloy and a preparation method thereof. Background technique [0002] Titanium and its alloys have a series of advantages such as low density, high specific strength, non-magnetism, and excellent corrosion resistance. They have been widely used in marine development and have become important structural materials. They are called "marine metals". ". [0003] As an alloy for ships and marine equipment, there are special requirements for the material itself, not only must it have sufficient strength, but also must take into account appropriate toughness. Because of the special service environment of titanium alloys used in marine engineering, especially in saline environments, there are particularly high requirements for the stress corrosion resistance of titanium alloys. In recent years, the development of my country'...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/03C22F1/18
CPCC22C1/03C22C14/00C22F1/183
Inventor 吴宇坤张斌斌王洋
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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