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A titanium alloy with medium strength and high impact toughness for marine engineering

A technology of impact toughness and marine engineering, which is applied in the field of titanium alloys, can solve problems such as failure to meet the performance requirements of high-pressure equipment, adverse effects on alloy performance, and low strength of industrial pure titanium, and achieve improved cold and hot processing performance, improved thermal processing performance, Effect of improving plasticity and weldability

Active Publication Date: 2018-02-06
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength of commercially pure titanium is not high, and its yield strength is generally between 150 and 450 MPa, which cannot meet the performance requirements for manufacturing high-voltage equipment
Titanium alloys such as TA10 and TA22 have higher strength and better crevice corrosion resistance than pure titanium, and are mainly used to prepare pipeline systems and valves for ship power plants, but the present invention finds that these alloys contain certain A large amount of Ni, the element Ni belongs to the fast eutectoid β stable element, is prone to segregation during the alloy melting process, and has an adverse effect on the properties of the alloy under long-term high-temperature service conditions

Method used

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  • A titanium alloy with medium strength and high impact toughness for marine engineering

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Effect test

Embodiment 1

[0024] The composition of the titanium alloy with medium strength and high impact toughness in this example is Ti-3.5Al-0.5Zr-1.2Mo-1.5Nb, that is: the alloy composition is Al 3.5%, Zr 0.5%, Mo 1.2%, Nb 1.5% by weight percentage %, the balance is Ti and unavoidable impurities.

[0025] The preparation process of the medium-strength and high-impact-toughness titanium alloy in this example is as follows: use Al-Mo master alloy, Al-Nb master alloy, aluminum beans, sponge zirconium and sponge titanium according to the design composition, and press the electrode, and then in the vacuum self-consumption The arc furnace is smelted for 2 to 3 times, and the smelted ingot is forged three times at 1150°C, 1050°C and 950°C respectively, and then the finished product is processed at 800°C to 900°C to obtain a diameter of 20mm. of bars. After simple annealing at 800°C / 1h, the bar's mechanical properties at room temperature are: tensile strength 645MPa, yield strength 546MPa, elongation af...

Embodiment 2

[0028] The composition of the titanium alloy with medium strength and high impact toughness in this example is Ti-1.8Al-3Zr-0.5Mo-2.5Nb, that is: the alloy composition is Al 1.8%, Zr 3.0%, Mo 0.5%, Nb 2.5% by weight percentage , the balance being Ti and unavoidable impurities.

[0029] The preparation process of the medium-strength and high-impact-toughness titanium alloy in this example is as follows: use Al-Mo master alloy, Al-Nb master alloy, aluminum beans, sponge zirconium and sponge titanium according to the design composition, and press the electrode, and then in the vacuum self-consumption The arc furnace is smelted for 2 to 3 times, and the smelted ingot is forged three times at 1150°C, 1050°C and 950°C respectively, and then the finished product is processed at 800°C to 900°C to obtain a diameter of 20mm. of bars. After the bar is annealed at 800°C / 1h, AC simple annealing, its mechanical properties at room temperature are: tensile strength is 572MPa, yield strength ...

Embodiment 3

[0031] The composition of the titanium alloy with medium strength and high impact toughness in this embodiment is Ti-2Al-1Zr-0.8Mo-1Nb, that is: the alloy composition is calculated as Al 2.0%, Zr 1.0%, Mo 0.8%, Nb 1.0%, and the rest The amount is Ti and unavoidable impurities.

[0032] The preparation process of the medium-strength and high-impact-toughness titanium alloy in this example is as follows: use Al-Mo master alloy, Al-Nb master alloy, aluminum beans, sponge zirconium and sponge titanium according to the design composition, and press the electrode, and then in the vacuum self-consumption The arc furnace is smelted for 2 to 3 times, and the smelted ingot is forged three times at 1150°C, 1050°C and 950°C respectively, and then the finished product is processed at 800°C to 900°C to obtain a diameter of 20mm. of bars. After the bar is annealed at 800°C / 1h, AC simple annealing, its room temperature mechanical properties are: tensile strength is 588MPa, yield strength is ...

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Abstract

The invention provides a moderate-intensity and high-impact-toughness titanium alloy in ocean engineering. The moderate-intensity and high-impact-toughness titanium alloy is prepared from the following components in percentage by mass: 1.5 percent to 3.5 percent of Al, 0.5 percent to 3 percent of Zr, 0.5 percent to 2 percent of Mo, 0.5 percent to 3 percent of Nb and the balance of Ti and unavoidable impurities. After the titanium alloy provided by the invention is simply annealed or subjected to dual annealing treatment, the yield strength is 450MPa to 550MPa and the impact toughness is not lower than 780kJ / m<2>. According to the titanium alloy provided by the invention, the yield strength can reach the grade of 450MPa to 550MPa under the condition that an element Ni is not added, and the titanium alloy has plasticity and toughness, which are equivalent to those of pure titanium; meanwhile, the titanium alloy has good seawater corrosion resistance and cold and hot machinability, and is applicable to manufacturing of related equipment of ocean engineering and shipping industry.

Description

technical field [0001] The invention belongs to the technical field of titanium alloys, in particular to a titanium alloy with medium strength and high impact toughness for marine engineering. Background technique [0002] Titanium and titanium alloys have a series of performance advantages such as high specific strength, non-magnetic, low thermal expansion coefficient, and corrosion resistance. As an important metal structure material, it is not only used in aerospace industry and petrochemical industry, but also in marine engineering. It is widely used in marine and ship equipment manufacturing, and is known as "marine metal". Among them, TA1, TA2 and other industrial pure titanium are widely used in the manufacture of heat exchangers, condensers and piping systems of seawater desalination devices due to their excellent seawater corrosion resistance and processing formability. However, the strength of commercially pure titanium is not high, and its yield strength is gener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22F1/18
CPCC22C14/00C22F1/183
Inventor 尹雁飞赵永庆侯智敏赵彬曾光
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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