Short-process preparation method for medium-strength and high-toughness titanium alloy medium-thickness plate

A tough titanium alloy and short-process technology, which is applied in the field of short-process preparation of medium-strength and high-toughness titanium alloy medium-thick plates, can solve the problems of low production efficiency, many times of forging, low fracture toughness, etc., to avoid excessive internal stress Larger, improved titanium alloy strength, and reduced processing costs

Active Publication Date: 2021-10-29
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Description
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  • Application Information

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Problems solved by technology

[0003] Generally, the equiaxed structure has high fatigue strength, but its fracture toughness is low. The fracture toughness of the alloy can be improved by adjusting the content of alloy elements and the structure of the structure, but combined with the requirements of the application index (K IC ≥88MPa.m 1 / 2 ), it is difficult to achieve a good match of comprehensive properties through conventional processing
At present, in order to achieve uniform equiaxed microstructure and strong-plastic matching requirements, it is usually necessary to adopt large deformation upsetting forging with at least 3 fires above the phase transition point and large deformation upsetting forging with no less than 5 fires below the phase transition point in the processing process. Deformation upsetting and drawing forging technology, in the production process, the upsetting and drawing forging with a total of more than 8 times of phase transition point is adopted to obtain a uniform and fine equiaxed structure. This process has many times of forging, long working hours and low production efficiency , which is also the status quo of the current military market, that is, in order to obtain products that meet performance requirements at any cost

Method used

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  • Short-process preparation method for medium-strength and high-toughness titanium alloy medium-thickness plate
  • Short-process preparation method for medium-strength and high-toughness titanium alloy medium-thickness plate
  • Short-process preparation method for medium-strength and high-toughness titanium alloy medium-thickness plate

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Experimental program
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Embodiment 1

[0040] This embodiment includes the following steps:

[0041] Step 1. Put 0 grade sponge titanium, Al-V master alloy, aluminum beans and TiO 2 The powder is mixed and pressed into a consumable electrode, and then the consumable electrode is subjected to three vacuum consumable smelting to obtain a Ti-6.3Al-4.2V-0.08O titanium alloy ingot with a diameter of 460 mm; the three vacuum consumable smelting During the process: the current of the first vacuum self-consumption smelting is 9kA, the vacuum degree is not greater than 4Pa, the current of the second vacuum self-consumption smelting is 14kA, the vacuum degree is not greater than 0.6Pa, the current of the third vacuum self-consumption smelting The melting voltage is 18kA, the vacuum degree is not greater than 0.6Pa, and the melting voltage is 30V to 35V in the three times of vacuum consumable melting; the mass fraction of Fe in the titanium alloy ingot is not greater than 0.02%, and the mass fraction of C is not greater than ...

Embodiment 2

[0057] This embodiment includes the following steps:

[0058] Step 1. Put 0 grade sponge titanium, Al-V master alloy, aluminum beans and TiO 2 The powder is mixed and pressed into a consumable electrode, and then the consumable electrode is subjected to three vacuum consumable smelting to obtain a Ti-6.2Al-4.05V-0.08O titanium alloy ingot with a diameter of 560 mm; the three vacuum consumable smelting During the process: the current of the first vacuum consumable smelting is 3kA, the vacuum degree is not greater than 4Pa, the current of the second vacuum consumable smelting is 18kA, the vacuum degree is not greater than 0.6Pa, the current of the third vacuum consumable smelting The melting voltage is 20kA, the vacuum degree is not greater than 0.6Pa, and the melting voltage is 30V to 35V in the three times of the vacuum consumable melting process; the mass fraction of Fe in the titanium alloy ingot is not greater than 0.02%, and the mass fraction of C is not greater than 0.01...

Embodiment 3

[0073] This embodiment includes the following steps:

[0074] Step 1. Put 0 grade sponge titanium, Al-V master alloy, aluminum beans and TiO 2 The powder is mixed and pressed into a consumable electrode, and then the consumable electrode is subjected to three vacuum consumable smelting to obtain a Ti-6.5Al-4.0V-0.12O titanium alloy ingot with a diameter of 520 mm; the three vacuum consumable smelting During the process: the current of the first vacuum consumable smelting is 6kA, the vacuum degree is not greater than 4Pa, the current of the second vacuum consumable smelting is 8kA, the vacuum degree is not greater than 0.6Pa, the current of the third vacuum consumable smelting The melting voltage is 15kA, the vacuum degree is not greater than 0.6Pa, and the melting voltage is 30V to 35V in the process of the vacuum consumable melting three times; the mass fraction of Fe in the titanium alloy ingot is not greater than 0.04%, and the mass fraction of C is not greater than 0.011%...

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Abstract

The invention discloses a short-process preparation method for a medium-strength and high-toughness titanium alloy medium-thickness plate. The short-process preparation method comprises the following steps that 1, raw materials are made into electrodes to be smelted; 2, a titanium alloy cast ingot is subjected to air cooling after heat preservation and forging; 3, a first forging stock titanium alloy is subjected to air cooling after heat preservation and forging; 4, a second forging stock titanium alloy is subjected to air cooling after heat preservation and forging; 5, a third forging stock titanium alloy is subjected to heat preservation and then water cooling; 6, the water-cooled titanium alloy forging stock is subjected to heat preservation and shaping after forging; and 7, a plate blank is subjected to solution aging treatment and machining, and the medium-strength and high-toughness titanium alloy medium-thickness plate is obtained. According to the short-process preparation method for the medium-strength and high-toughness titanium alloy medium-thickness plate, the titanium alloy cast ingot is subjected to cogging forging above the phase transformation point, a large-deformation uniform forging technology and deformation below the phase transformation point, then homogenization treatment at the lower temperature above the phase transformation point and large-deformation forging below the temperature of the phase transformation point are combined, the medium-strength and high-toughness titanium alloy medium-thickness plate can be obtained only through the four-heating-number forging technology, and the machining processing period can be greatly shortened and the machining cost can be reduced on the premise of ensuring the material performance.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy material processing, and in particular relates to a short-process preparation method for medium-thick titanium alloy plate with medium strength and high toughness. Background technique [0002] The development of the aerospace industry must rely on the promotion of advanced materials. In recent years, with the development of fracture mechanics and damage tolerance theory, the design criteria of aircraft components have changed. At present, high damage tolerance titanium alloys have become an important research field of titanium alloys. The medium-strength and high-toughness damage-tolerant structural titanium alloy represented by TC4-DT has become a At present, it is the most mature and widely used titanium alloy in the field of aviation manufacturing. The alloy has high fracture toughness under the basket structure or Widmanstatten structure, but its strong plasticity is low. In order to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C14/00C22F1/18B21J5/00
CPCC22C1/03C22C14/00B21J5/002C22F1/183
Inventor 郭萍侯红苗洪权张永强潘浩毛小南
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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