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Near beta-type high-strength titanium alloy

A titanium alloy and alloy technology, applied in the field of near-beta type high-strength titanium alloys, can solve the problems of composition segregation, high price, increase the cost of alloy raw materials, etc., and achieve the effects of good mechanical properties, lower production costs, and difficulty in composition segregation.

Active Publication Date: 2011-10-12
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The V element is very expensive, and excessive addition will significantly increase the raw material cost of the alloy; while the Mo element has a high melting point, and excessive addition will easily cause composition segregation, resulting in difficulty in controlling the alloy composition and microstructure uniformity

Method used

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  • Near beta-type high-strength titanium alloy

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Experimental program
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Effect test

Embodiment 1

[0015] Titanium alloy materials are prepared according to the nominal composition Ti-3Al-3V-3Mo-2.5Cr-4.5Zr-3Sn-1Fe (weight percent, %), and the raw materials are Al-75% V master alloy, Al-58% Mo master alloy, Ti -80% Sn master alloy, V-50% Fe master alloy, 0 grade sponge titanium, firearm sponge zirconium, pure Cr and pure Al. After mixing the materials, press them into electrodes, and smelt them three times in a vacuum consumable electric arc furnace to obtain alloy ingots. Alloy [Mo] 当 =11.8, [Al] 当 =4.75, which meets the requirements of the present invention for alloy molybdenum equivalent and aluminum equivalent. After peeling the ingot, cutting off the riser and tail end, the billet is forged at 1150°C, at T β -30 ℃ ~ 50 ℃ for multiple times pier drawing and forging into Φ60mm bar. The measured mechanical properties of the bar after heat treatment at 800°C / 2h / WQ+520°C / 4h / AC are: yield strength 1080MPa, breaking strength 1145Mpa, and elongation 10%.

Embodiment 2

[0017] Prepare the alloy material according to the nominal composition Ti-3Al-3V-3Mo-2.5Cr-4.5Zr-3Sn-1.4Fe (weight percentage, %), and the raw materials use Al-75% V master alloy, Ti-32% Mo master alloy, Ti -80% Sn master alloy, V-50% Fe master alloy, 0 grade sponge titanium, firearm sponge zirconium, pure Cr and pure Al. After mixing the materials, press them into electrodes, and smelt them three times in a vacuum consumable electric arc furnace to obtain alloy ingots. Alloy [Mo] 当 =13, [Al] 当 =4.75, which meets the requirements of the present invention for alloy molybdenum equivalent and aluminum equivalent. After peeling the ingot, cutting off the riser and tail end, the billet is forged at 1150°C, and then at T β -30 ℃ ~ 50 ℃ for multiple fire deformation and then made into slab, the last fire at T β +30℃ hot forging into 25mm thick plate. After the thick plate is heat-treated at 760°C / 2h / WQ+480°C / 8h / AC, the measured mechanical properties along the rolling direction a...

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Abstract

The invention belongs to the technical field of materials sciences, and relates to a near beta-type high-strength titanium alloy. The alloy is characterized by comprising the following elements in percentage by weight: 2.5 to 3.5 percent of Al, 2.8 to 3.5 percent of V, 2.9 to 4.5 percent of Mo, 1.5 to 2.9 percent of Cr, 4.1 to 6 percent of Zr, 2 to 4 percent of Sn, 1 to 2 percent of Fe and the balance of Ti; and the alloy also comprises the following impurity elements: less than or equal to 0.04 percent of C, less than or equal to 0.15 percent of O, less than or equal to 0.04 percent of N, and less than or equal to 0.015 percent of H. Good mechanical property of the near beta-type titanium alloy is maintained, segregation of the components is not easily caused, and meanwhile, the production cost of the alloy is reduced to a certain degree; and the alloy can be widely applied in the industrial fields of aviation, aerospace, automobiles and the like.

Description

technical field [0001] The invention belongs to the technical field of materials and relates to a near-beta high-strength titanium alloy. Background technique [0002] Molybdenum equivalent [Mo] 当 Titanium alloys between 10 and 30 will form a metastable β-phase matrix during quenching treatment. This type of titanium alloy is called a near-β-type titanium alloy. During the aging treatment, the dispersed secondary α phase is gradually precipitated on the β matrix, so that the alloy obtains high strength. By adjusting the temperature and time of aging heat treatment, the quantity and size of the secondary α phase can be controlled, so that the strength and plasticity of the near-β-type titanium alloy can be changed in a wide range, and the matching of strength and toughness can be obtained to meet different needs. Since the β phase is a body-centered cubic crystal structure with good plasticity, the near-β-type titanium alloy usually has good cold and hot processing processa...

Claims

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Application Information

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IPC IPC(8): C22C14/00
Inventor 雷力明黄旭李臻熙李四清
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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