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Damage tolerant medium-strength titanium alloy

A damage tolerance and titanium alloy technology, applied in the field of titanium alloy materials, can solve harmful problems, achieve stable material performance, improve acid corrosion resistance, and improve high temperature oxidation resistance

Inactive Publication Date: 2016-04-20
WESTERN METAL MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two main titanium alloys contain vanadium, an element harmful to the human body.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The damage tolerance medium-strong titanium alloy of this embodiment is composed of the following components by mass percentage: aluminum 6.7%, zirconium 2.82%, molybdenum 3.01%, niobium 3.05%, and the balance is titanium and unavoidable impurities.

[0021] The preparation method of the titanium alloy of this embodiment is: smelting according to the composition of the titanium alloy to prepare aluminum-molybdenum master alloy and aluminum-niobium master alloy, and then mixing sponge zirconium, sponge titanium, aluminum-molybdenum master alloy and aluminum-niobium master alloy to uniformly press the electrode, A titanium alloy ingot is obtained by smelting in a vacuum consumable electric arc furnace three times in a conventional method. After testing: the mass percentage of inevitable impurities in the titanium alloy of this embodiment meets the following conditions: iron≤0.05%, carbon≤0.02%, nitrogen≤0.008%, oxygen≤0.16%, hydrogen≤0.009%, silicon≤ 0.04%, the content of ot...

Embodiment 2

[0024] The damage tolerance medium-strength titanium alloy of this embodiment is composed of the following components by mass percentage: aluminum 6.0%, zirconium 2.60%, molybdenum 2.93%, niobium 2.70%, and the balance is titanium and inevitable impurities.

[0025] The preparation method of the titanium alloy of this embodiment is: smelting according to the composition of the titanium alloy to prepare aluminum-molybdenum master alloy and aluminum-niobium master alloy, and then mixing sponge zirconium, sponge titanium, aluminum-molybdenum master alloy and aluminum-niobium master alloy to uniformly press the electrode, The titanium alloy ingot is obtained by smelting three times in a vacuum consumable electric arc furnace according to a conventional method. After testing: the mass percentage of inevitable impurities in the titanium alloy of this embodiment meets the following conditions: iron≤0.05%, carbon≤0.02%, nitrogen≤0.008%, oxygen≤0.16%, hydrogen≤0.009%, silicon≤ 0.04%, the ...

Embodiment 3

[0028] The damage tolerance medium-strength titanium alloy of this embodiment is composed of the following components by mass percentage: aluminum 6.6%, zirconium 2.05%, molybdenum 2.70%, niobium 2.77%, and the balance is titanium and inevitable impurities.

[0029] The preparation method of the titanium alloy of this embodiment is: smelting according to the composition of the titanium alloy to prepare aluminum-molybdenum master alloy and aluminum-niobium master alloy, and then mixing sponge zirconium, sponge titanium, aluminum-molybdenum master alloy and aluminum-niobium master alloy to uniformly press the electrode, The titanium alloy ingot is obtained by smelting three times in a vacuum consumable electric arc furnace according to a conventional method. After testing: the mass percentage of inevitable impurities in the titanium alloy of this embodiment meets the following conditions: iron≤0.05%, carbon≤0.02%, nitrogen≤0.008%, oxygen≤0.16%, hydrogen≤0.009%, silicon≤ 0.04%, the ...

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Abstract

The invention discloses a damage tolerant medium-strength titanium alloy which is composed of, by mass, 5.5-7% of aluminum, 2.0-3.5% of zirconium, 2.0-3.5% of molybdenum, 2.0-3.5% of niobium and the balance of titanium and unavoidable impurities. Room-temperature tensile strength in an annealing state is 900-1000 MPa, room-temperature fracture toughness KIC is greater than or equal to 70 MPa.m1 / 2, and room-temperature fatigue crack propagation rate is da / dN is less than 3.5x10-5mm / cycle when R=0.1 and delta K=11 MPa.m1 / 2. The damage tolerant medium-strength titanium alloy does not contain element vanadium harmful to human body, element niobium difficult to being oxidized is added, raw material cost is not obviously increased generally while material performance is more stable, and safety and reliability of material application are improved.

Description

Technical field [0001] The invention belongs to the technical field of titanium alloy materials, and specifically relates to a damage tolerance medium-strength titanium alloy. Background technique [0002] At present, the most used titanium alloy in the world is the Ti-6Al-4V titanium alloy first developed by the United States before the 1950s, accounting for more than 50% of the total titanium alloy consumption. The former Soviet Union developed its own Ti-6Al-2Zr-1Mo-1V titanium alloy for this alloy in the late 1960s and early 1970s, and it has been widely used in the Russian titanium industry. But the above two main titanium alloys contain vanadium which is harmful to the human body. The development of my country's damage tolerance titanium alloy system and the development of new medium-strength titanium alloys that do not contain easily oxidized elements and harmful elements to the human body and require preparation and mechanical properties equivalent to the American Ti-6Al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22F1/18
CPCC22C14/00C22F1/183
Inventor 曲恒磊李明强邓超康彦李明利赵永庆
Owner WESTERN METAL MATERIAL
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