Ultrahigh-strength Ti-Al-Zr-Mo-Cr-series beta titanium alloy and thermal treatment process thereof

A β-titanium alloy and ultra-high-strength technology, applied in the field of alloy materials, can solve problems such as plasticity decline and application limitations, and achieve the effects of reducing temperature sensitivity, high strength, and improving thermal stability

Active Publication Date: 2018-03-02
XI AN JIAOTONG UNIV
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  • Description
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  • Application Information

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Problems solved by technology

However, taking the Ti-5553 alloy as an example, the alloy has excellent strong-plasticity matching and fatigue performance at the 1200MPa level, and the plasticity decreases significantly with the further increase of the alloy strength
The TB10 alloy developed by the Beijing Institute of Nonferrous Metals in China has undergone an appropriate heat treatment process R m It can reach the level of 1300MPa, and has been successfully applied in the Shenzhou-2 orbital warehouse and the star-rocket connection system, but its application is also limited in higher-intensity service environments

Method used

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  • Ultrahigh-strength Ti-Al-Zr-Mo-Cr-series beta titanium alloy and thermal treatment process thereof
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  • Ultrahigh-strength Ti-Al-Zr-Mo-Cr-series beta titanium alloy and thermal treatment process thereof

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preparation example Construction

[0029] The preparation method of the ultra-high-strength β-titanium alloy of the present invention includes the following steps: different from the vacuum consumable arc furnace (VAR) used in conventional titanium alloy smelting, the present invention adopts an advanced cold crucible suspension melting method (CCLM). Select the type of raw material according to the actual needs, calculate the ratio of raw materials according to the alloy composition and mix them evenly, load the raw materials into the furnace in bulk and carry out 3 times of suspension melting to obtain ingots. After the ingot is peeled and riser is cut, the billet is opened, high-temperature forging and post-forging heat treatment are obtained to obtain ultra-high-strength alloy plates.

[0030] Specifically, the raw materials involved in the alloy smelting include: Al-Mo, Ti-Mo master alloy, pure Cr, pure aluminum beans, 0-grade sponge titanium and sponge zirconium. First of all, according to the design comp...

Embodiment 1

[0032] Ti-Al-Zr-Mo-Cr series β-titanium alloy is composed of the following components by weight percentage: 5-5.1% Al, 4.06-4.15% Zr, 9.8%-10% Mo, 3.03-3.15% Cr, The balance is Ti and unavoidable impurity elements.

[0033]According to the above design composition, Ti-32Mo, Al-62Mo master alloy, pure Cr, pure Al sponge titanium and sponge zirconium are mixed evenly according to the ratio and loaded into the furnace in bulk, followed by CCLM melting, and 400MPa high-purity argon gas is introduced during the melting process , the induction current is 350-400A, the current frequency is 20-25KHz, and it is kept for 3 minutes after the alloy is completely melted. In order to ensure uniform composition, the alloy was smelted three times, and the ingot was turned upside down and loaded into the furnace during the second and third smelting. The alloy composition and impurity content were measured by ICP-AES and elemental analyzer, as shown in Table 1. Using metallographic method and...

Embodiment 2

[0041] Ti-Al-Zr-Mo-Cr series β-titanium alloy is composed of the following components by weight percentage: 5-5.1% Al, 4.06-4.15% Zr, 9.8%-10% Mo, 3.03-3.15% Cr, The balance is Ti and unavoidable impurity elements.

[0042] According to the above design composition, Ti-32Mo, Al-62Mo master alloy, pure Cr, pure Al sponge titanium and sponge zirconium are mixed evenly according to the ratio and loaded into the furnace in bulk, followed by CCLM melting, and 400MPa high-purity argon gas is introduced during the melting process , the induction current is 350-400A, the current frequency is 20-25KHz, and it is kept for 3 minutes after the alloy is completely melted. In order to ensure uniform composition, the alloy was smelted three times, and the ingot was turned upside down and loaded into the furnace during the second and third smelting. The alloy composition and impurity content were measured by ICP-AES and elemental analyzer, as shown in Table 1. Using metallographic method an...

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Abstract

Ultrahigh-strength Ti-Al-Zr-Mo-Cr-series beta titanium alloy and a thermal treatment process thereof. The thermal treatment includes steps of performing solution treatment to Ti-Al-Zr-Mo-Cr-series beta titanium alloy and then performing aging treatment. The Ti-Al-Zr-Mo-Cr-series beta titanium alloy includes, by weight, 4.5-5.5% of Al, 3.5-4.5% of Zr, 9.5-10.5% of Mo, and 2.5-3.5% of Cr, the balanced being Ti. The alloy, after smelting, forging and toughening thermal treatment, has ultrahigh strength and plasticity. The alloy includes aluminum and also a certain amount of a neutral element, zirconium, so that alpha-phase is further reinforced; by adding the molybdenum at high mass percentage, a beta-matrix is reinforced; in addition, due to the low diffusion rate of molybdenum, temperaturesensitivity of the alloy in a two-phase zone during forging is reduced, thus enlarging processing window of the alloy.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to an ultrahigh-strength Ti-Al-Zr-Mo-Cr series beta titanium alloy and a heat treatment process thereof. technical background [0002] Since the first commercial β-titanium alloy Ti-13-11-3 was born in 1952 and successfully applied to the SR-71 Blackbird fighter, β-titanium alloy has high strength, excellent plasticity and toughness matching, and good cold forming performance Has been widely concerned at home and abroad. In particular, near-β and metastable β alloys, which have both the performance advantages of two-phase alloys and β-alloys, have achieved rapid development in industrial applications in the past decade. [0003] Most of the early high-strength alloys had a high Mo equivalent, and the dispersed α phase was obtained through solid solution and aging treatment to strengthen the alloy. Typical representatives include Western β-C alloys, Ti-15-3 allo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22F1/18C22C1/03
CPCC22C1/03C22C14/00C22F1/183
Inventor 孙巧艳朱文光肖林王遂孙军
Owner XI AN JIAOTONG UNIV
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