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A kind of titanium alloy with high strength and high dynamic tearing energy and its preparation method and application

A titanium alloy, high dynamic technology, applied in the field of titanium alloys, can solve the problems of fracture toughness and stress corrosion cracking resistance, welding performance can not meet the requirements well, high strength and high toughness are difficult to have at the same time, poor processing performance, etc. Achieve excellent comprehensive performance, excellent processing performance, and the effect of improving plasticity

Active Publication Date: 2021-03-02
WESTERN METAL MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the strength of commonly used marine titanium alloys is mostly lower than 1000MPa, and it is difficult to have both high strength and high toughness
For example, the Ti5111 titanium alloy in the United States has a tensile strength of 800MPa and a V-shaped impact toughness of 50-80J / cm 2 , the dynamic tear energy is 350~600J, it has good toughness, but the strength is low
Domestic representative marine titanium alloys include TC4ELI titanium alloy and Ti80 titanium alloy. Among them, TC4ELI titanium alloy is widely used because of its high strength advantages, but its fracture toughness is not good in harsh application environments, such as strong vibration. And stress corrosion cracking resistance and welding performance can not meet the requirements well; Ti80 titanium alloy has excellent comprehensive performance, but its processing performance is poor, and it is easy to crack during thermal processing

Method used

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  • A kind of titanium alloy with high strength and high dynamic tearing energy and its preparation method and application
  • A kind of titanium alloy with high strength and high dynamic tearing energy and its preparation method and application
  • A kind of titanium alloy with high strength and high dynamic tearing energy and its preparation method and application

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preparation example Construction

[0029] The present invention also provides a preparation method of the high-strength and high-dynamic tear energy titanium alloy described in the above technical solution, comprising the following steps:

[0030] The raw materials of titanium alloy with high strength and high dynamic tearing energy are mixed according to the designed ratio, then pressed into electrodes, and then vacuum consumable arc melting is carried out to obtain titanium alloy ingots;

[0031] The titanium alloy ingot is sequentially forged, rolled and annealed to obtain a titanium alloy with high strength and high dynamic tearing energy.

[0032] The invention mixes high-strength and high-dynamic tearing energy titanium alloy raw materials according to the designed ratio, then presses them into electrodes, and carries out vacuum consumable arc melting to obtain titanium alloy ingots.

[0033] The present invention does not specifically limit the specific types of raw materials for the titanium alloy with ...

Embodiment 1

[0046] (1) The nominal composition of the titanium alloy prepared in this embodiment is Ti-4.0Al-2.0Nb-2.0Zr-1.5V-0.7Mo-0.6Cr-0.4Fe, that is, Al4.0%, Nb2 .0%, Zr2.0%, V1.5%, Mo0.7%, Cr0.6%, Fe0.4%, the balance of Ti and unavoidable impurities;

[0047] The raw materials used are: grade 1 sponge zirconium: particle size 0.8-12.7mm; grade 1 sponge titanium: particle size 0.83-25.4mm; aluminum beans: particle size 8-13mm; aluminum-molybdenum alloy: particle size 0.1-0.8 mm of AlMo60; aluminum-vanadium alloy: AlV55 with a particle size of 1-6mm; aluminum-niobium alloy: AlNb60 with a particle size of 0.3-6mm; low-carbon ferrochrome: 60 mesh FeCr55C0.06; FeMo60;

[0048] (2) Mix aluminum-molybdenum alloy, aluminum-vanadium alloy, aluminum-niobium alloy, low-carbon ferrochromium, molybdenum-iron alloy, aluminum bean, grade 1 sponge zirconium and grade 1 sponge titanium according to the above-mentioned proportions, press them into electrodes, and then The Φ560mm titanium alloy ingot...

Embodiment 2

[0056] (1) The nominal composition of the titanium alloy prepared in this embodiment is Ti-4.5Al-1.5Nb-2.5Zr-1.5V-0.9Mo-0.8Cr-0.4Fe, which is Al4.5%, Nb1 .5%, Zr2.2%, V1.5%, Mo0.9%, Cr0.8%, Fe0.4%, the balance of Ti and unavoidable impurities;

[0057] (2) Using the raw materials in Example 1, aluminum-molybdenum alloy, aluminum-vanadium alloy, aluminum-niobium alloy, low-carbon ferrochrome, molybdenum-iron alloy, aluminum beans, grade 1 sponge zirconium and grade 1 sponge titanium are mixed according to the above-mentioned proportions, Pressed into an electrode, and then smelted three times in a vacuum consumable electric arc furnace to obtain a Φ640mm titanium alloy ingot, where the absolute pressure vacuum degree of smelting is 10 -2 Pa, the voltage of the first smelting is 30V and the current is 12kA; the voltage of the second smelting is 32V and the current is 16kA; the voltage of the third smelting is 35V and the current is 25kA;

[0058] (3) The titanium alloy ingot is...

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Abstract

The invention provides a titanium alloy with high strength and high dynamic tearing energy, a preparation method and application thereof, and belongs to the technical field of titanium alloys. The titanium alloy with high strength and high dynamic tearing energy provided by the present invention includes the following components in weight percent: 4% to 6% of Al, 1.5% to 2.5% of Nb, 1.5% to 2.5% of Zr, 1.0% to 1.5% of V, Mo 0.6% to 0.9%, Cr 0.5% to 0.8%, Fe 0.3% to 0.4%, and the balance is Ti and unavoidable impurities. The tensile strength of the titanium alloy provided by the present invention is more than 900MPa, and the V-shaped impact toughness is 50J / cm 2 At the same time, its dynamic tear energy is above 350J, which has excellent comprehensive performance and is suitable for use as a marine titanium alloy. The titanium alloy has excellent processing performance and is not easy to crack. The above excellent properties can be obtained by ordinary heat treatment and double heat treatment.

Description

technical field [0001] The invention relates to the technical field of titanium alloys, in particular to a titanium alloy with high strength and high dynamic tearing energy, a preparation method and application thereof. Background technique [0002] Marine titanium alloys not only require strength and corrosion resistance, but also require titanium alloys to have excellent toughness. At present, the strength of commonly used marine titanium alloys is mostly lower than 1000MPa, and it is difficult to have both high strength and high toughness. For example, the Ti5111 titanium alloy in the United States has a tensile strength of 800MPa and a V-shaped impact toughness of 50-80J / cm 2 , The dynamic tear energy is 350~600J, it has good toughness, but the strength is low. Domestic representative marine titanium alloys include TC4ELI titanium alloy and Ti80 titanium alloy. Among them, TC4ELI titanium alloy is widely used because of its high strength advantages, but its fracture to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22F1/18
CPCC22C14/00C22F1/183
Inventor 葛鹏席锦会王瑞琴侯鹏廖强刘宇
Owner WESTERN METAL MATERIAL