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Low-cost alpha and beta-type titanium alloy

A titanium alloy, low-cost technology, applied in the alloy field, can solve the problems of high price, high processing cost, high production cost, etc., and achieve the effect of reducing production cost, broad engineering application prospects, and high cost performance

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

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Problems solved by technology

Owing to containing the expensive vanadium element of 4% (percentage by weight, the same below) in the Ti-6Al-4V alloy, cause the production cost of Ti-6Al-4V alloy to be higher, thereby limit it in industrial field, especially in civil Field of application
Ti-6Al-4V alloy not only has high processing cost, but also is difficult to process parts with complex shapes, thus limiting its application in a wider range

Method used

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  • Low-cost alpha and beta-type titanium alloy
  • Low-cost alpha and beta-type titanium alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0009] The alloy material is prepared according to the nominal composition Ti-3.5Al-2.5Mo-2Zr-2.3Cr (weight percent, %), and the raw materials are Al-55% Mo master alloy, 0-grade sponge titanium, firearm sponge zirconium, pure Al and pure Cr. After mixing the materials, press them into electrodes, and smelt them three times in a vacuum consumable electric arc furnace to obtain alloy ingots. After peeling the ingot, cutting off the riser and tail end, the billet is forged at 1150°C, and the β Under -30℃~80℃, multi-fire pier drawing is carried out to refine the structure, and finally forged into a Ф55mm bar. The typical values ​​of the mechanical properties of the bar after heat treatment at 650°C / 1h / AC are: yield strength ≥ 870MPa, breaking strength ≥ 950Mpa, elongation ≥ 10%.

Embodiment 2

[0011] The alloy material is prepared according to the nominal composition Ti-3Al-2.5Mo-2Zr-2.8Cr (weight percent, %), and the raw materials are Ti-32% Mo master alloy, 0-grade sponge titanium, firearm sponge zirconium, pure Al and Ti-Fe intermediate alloy. After mixing the materials, press them into electrodes, and smelt them three times in a vacuum consumable electric arc furnace to obtain alloy ingots. After peeling the ingot, cutting off the riser and tail end, the billet is forged at 1150°C, and the β -30 ℃ ~ 80 ℃ for multiple times of piercing to refine the structure, and finally rolled into a Ф22mm bar. The typical values ​​of the mechanical properties of the bar after heat treatment at 860°C / 1h / WQ+650°C / 2h / AC are: yield strength ≥ 910MPa, breaking strength ≥ 980Mpa, elongation ≥ 13%.

[0012] See Table 1 for the nominal composition of the alloys of Examples 3 to 16.

[0013] Table 1 Alloy Nominal Composition of Embodiment 3~Example 16

[0014] Al: 3%~3.7%; Mo: 2.5%...

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Abstract

The invention belongs to the technical field of alloys, and relates to a low-cost alpha and beta-type titanium alloy. The alloy is characterized by comprising the following components in percentage by weight: 3 to 3.7 percent of Al, 2.5 to 4 percent of Mo, 2 to 4 percent of Zr, 0 to 0.35 percent of Si, 2.3 to 3.3 percent of Cr or 0.4 to 1.2 percent of Fe, and the balance of Ti; the total amount of the impurity elements in the alloy is less than or equal to 0.4 percent, and the interstitial impurity element C is less than or equal to 0.04 percent; and the alloy comprises the following impurityelements: 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. Expensive vanadium element is substituted by using other metals with low prices in the alpha and beta-type titanium alloy, so the production cost of the alloy is reduced. Because the comprehensive mechanical property of the alpha and beta-type titanium alloy is equivalent to that of Ti-6Al-4V, the alpha and beta-type titanium alloy has higher cost performance and broad engineering application prospect.

Description

technical field [0001] The invention belongs to the technical field of alloys and relates to a low-cost alpha+beta type titanium alloy. Background technique [0002] Titanium and titanium alloys are widely used in aviation, aerospace, weapons, automobiles and other industrial fields due to their high specific strength and good corrosion resistance. So far, dozens of titanium alloys have been successfully developed at home and abroad, among which Ti-6Al-4V alloy is the most widely used. In all titanium alloy application fields such as aviation, automobile, energy, ship, chemical industry, medical equipment and sporting goods, the proportion of Ti-6Al-4V alloy accounts for more than 50%. Owing to containing the expensive vanadium element of 4% (percentage by weight, the same below) in the Ti-6Al-4V alloy, cause the production cost of Ti-6Al-4V alloy to be higher, thereby limit it in industrial field, especially in civil field of application. Ti-6Al-4V alloy not only has hig...

Claims

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Application Information

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