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A medium-strength and high-ductility titanium alloy

A titanium alloy, high plasticity technology, applied in the field of titanium alloy materials, can solve the problems of poor cold and hot workability, insufficient room temperature plasticity, affecting the formability of components, etc., and achieve the effects of improved room temperature plasticity, excellent cold workability, and cost reduction.

Active Publication Date: 2017-10-20
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its characteristic is that the plasticity does not decrease basically at low temperature, but its disadvantages are that the plasticity at room temperature is insufficient, and the cold and hot workability is poor, which seriously affects the formability of components

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The strong and high plasticity titanium alloy in this embodiment is composed of the following components by mass percentage: Nb 26%, Mo 3%, W 1%, O 0.14%-0.19%, and the balance is Ti and unavoidable impurities.

[0020] The preparation method of the strong and high-plasticity titanium alloy in this embodiment is: according to the nominal composition Ti-26Nb-3Mo-1W-(0.14~0.19)O of the alloy, raw materials are selected: niobium rod, molybdenum powder, Ti-30W alloy, zirconium sponge, Titanium oxide powder and 0-grade sponge titanium, and then mix the intermediate alloys and sponge titanium according to the design composition to press the electrode, and then use a vacuum consumable electric arc furnace to melt into an alloy ingot three times; the measured oxygen content of the alloy ingot is 0.18wt%; then The alloy ingot is forged into a round billet with a diameter of 100mm at a temperature of 1150°C, hot-rolled at a temperature of 900°C into a wire with a diameter of 8mm, ...

Embodiment 2

[0023] The strong and high plasticity titanium alloy in this embodiment is composed of the following components by mass percentage: Nb 23%, Mo 4%, W2%, O 0.10%-0.15%, and the balance is Ti and unavoidable impurities.

[0024] The preparation method of the strong and high plasticity titanium alloy in the present embodiment is: select raw material according to the nominal composition Ti-23Nb-4Mo-2W-(0.1~0.15)O of the alloy: niobium sintered bar, molybdenum powder, tungsten powder, titanium oxide powder and 0-grade sponge titanium, and then mix the master alloys and sponge titanium according to the design composition to press the electrode, and then smelt the alloy ingot three times in a vacuum consumable electric arc furnace; the measured oxygen content of the alloy ingot is 0.17wt%; then the alloy ingot is Under the temperature of 1180°C, the billet is forged into a round billet with a diameter of 150mm, hot-extruded at a temperature of 980°C into a tube billet with a wall thick...

Embodiment 3

[0027] The strong and high plasticity titanium alloy in this embodiment is composed of the following components by mass percentage: Nb 20%, Mo 5%, O 0.10%-0.15%, and the balance is Ti and unavoidable impurities.

[0028] The preparation method of the strong and high-plastic titanium alloy in this embodiment is: select raw materials according to the nominal composition Ti-20Nb-5Mo-(0.1~0.15)O of the alloy: niobium powder, molybdenum powder and 0-grade sponge titanium, and then each intermediate alloy Mix and press the electrode with sponge titanium according to the design composition, and then use a vacuum consumable electric arc furnace to melt into an alloy ingot three times; the measured oxygen content of the alloy ingot is 0.08wt%; then the alloy ingot is forged at a temperature of 1100°C A round billet of 150mm is hot-forged into a titanium alloy round bar with a diameter of 50mm at a temperature of 950°C.

[0029] The tensile properties at room temperature of the titanium...

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Abstract

The invention provides medium-strength high-plasticity titanium alloy. The medium-strength high-plasticity titanium alloy is prepared from, by mass, 11%-26% of Nb, 4%-11% of Mo+W, 0.08%-0.19% of O and the balance Ti and inevitable impurities, wherein Mo>=3%, and 0%<=W<=4%. After the titanium alloy is subjected to heat treatment, the room temperature tensile strength of the alloy is 600-800 MPa, the room temperature ductility is not smaller than 20%, the cold and heat machinability is excellent, and the titanium alloy has high plasticity under the normal temperature condition and the liquid hydrogen temperature condition and can meet the requirement for rivets and ultralow-temperature structural parts in the application fields such as the aviation field and the aerospace field.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy materials, and in particular relates to a medium-strength and high-plasticity titanium alloy. Background technique [0002] Ti45Nb alloy is currently the most important titanium alloy material for aircraft manufacturing rivets. It is characterized by moderate strength and good cold plasticity to meet the requirements of cold heading. However, the higher Nb content of Ti45Nb leads to alloys with a series of disadvantages. For example: the cost of raw materials is high; the alloy is easy to oxidize at high temperature, the loss is high during thermal processing; the density is high, etc. Therefore, the aerospace field has a clear demand for new titanium alloys for rivets with lower development costs, lower densities and applications. [0003] At present, low-temperature titanium alloys that can be used at liquid hydrogen temperatures are generally low-gap near-alpha titanium alloys, such as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00
CPCC22C14/00
Inventor 葛鹏赵永庆李倩周伟
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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