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Processing method of ultra-low-gap medium-strength high-toughness titanium alloy thick plate

A technology of tough titanium alloy and processing method, applied in the field of titanium alloy, can solve the problems of low fatigue crack growth rate, influence of comprehensive properties of materials, limitation of application scope, etc., and achieve the effect of reducing dead zone of deformation, avoiding metallurgical defects and low cost

Active Publication Date: 2022-04-01
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, in order to achieve higher fracture toughness and lower fatigue crack growth rate, most of the TC4-DT titanium alloy structural parts adopt near β forging or β heat treatment in the processing process, and the obtained product microstructure is basket structure or sheet Microstructure, coarse grains, generally low plasticity, poor fatigue performance, affected comprehensive properties of materials, and limited scope of application

Method used

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  • Processing method of ultra-low-gap medium-strength high-toughness titanium alloy thick plate
  • Processing method of ultra-low-gap medium-strength high-toughness titanium alloy thick plate
  • Processing method of ultra-low-gap medium-strength high-toughness titanium alloy thick plate

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Embodiment 1

[0032] This embodiment includes the following steps:

[0033] Step 1. Combine 0-grade sponge titanium with Al-V, aluminum beans, and TiO 2 The powder is prepared in the way of cloth, using the method of 3 clips 2, laying 3 layers of 0-grade sponge titanium in each electrode, and adding Al-V, aluminum beans, TiO 2 After the powder is mixed evenly, it is laid in the interlayer of adjacent 0-grade sponge titanium, and a total of 2 layers are laid, and then pressed under a pressure of 55MPa for 20s to obtain an electrode. Interstitial TC4-DT ingot; the mass content of impurities in the TC4-DT ingot is: Fe 0.020%, C 0.009%, N 0.004%, H 0.0010%, O 0.062%; the TC4-DT titanium alloy The β transition temperature is 975°C;

[0034] Step 2. The TC4-DT ingot obtained in step 1 is machined to remove the surface oxide layer to a diameter of 590 mm. Heating in sections is carried out at 800°C for 120 minutes, and then heated at a heating rate of 2.5°C / min. to 1150°C and keep warm for 315m...

Embodiment 2

[0047] This embodiment includes the following steps:

[0048] Step 1. Combine 0-grade sponge titanium with Al-V, aluminum beans, and TiO 2 The powder is prepared in the way of cloth, using the method of 3 clips 2, laying 3 layers of 0-grade sponge titanium in each electrode, and adding Al-V, aluminum beans, TiO 2 After the powder is mixed evenly, it is laid in the interlayer of adjacent 0-grade sponge titanium, and a total of 2 layers are laid, and then pressed under a pressure of 45MPa for 25s to obtain an electrode. Interstitial TC4-DT ingot; the mass content of impurities in the TC4-DT ingot is: Fe 0.018%, C 0.008%, N 0.003%, H 0.0009%, O 0.079%; the TC4-DT titanium alloy The β transition temperature is 970°C;

[0049] Step 2. The TC4-DT ingot obtained in step 1 is machined to remove the surface oxide layer to a diameter of 580 mm. Heating in sections is carried out at 850°C for 120 minutes, and then heated at a heating rate of 2.5°C / min. to 1100°C and keep warm for 320m...

Embodiment 3

[0062] This embodiment includes the following steps:

[0063] Step 1. Combine 0-grade sponge titanium with Al-V, aluminum beans, and TiO 2The powder is prepared in the way of cloth, using the method of 3 clips 2, laying 3 layers of 0-grade sponge titanium in each electrode, and adding Al-V, aluminum beans, TiO 2 After the powder is mixed evenly, it is laid in the interlayer of adjacent 0-grade sponge titanium, and a total of 2 layers are laid, and then pressed under a pressure of 35MPa for 30s to obtain an electrode. Interstitial TC4-DT ingot; the mass content of impurities in the TC4-DT ingot is: Fe 0.020%, C 0.006%, N 0.003%, H 0.0008%, O 0.083%; the TC4-DT titanium alloy The β transition temperature is 967°C;

[0064] Step 2. The TC4-DT ingot obtained in step 1 is machined to remove the surface oxide layer to a diameter of 540 mm. Using segmental heating, first heat to 850 ° C for 150 min, and then heat at a heating rate of 2 ° C / min to 1100°C and keep warm for 290min,...

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Abstract

The invention discloses a processing method of an ultralow-gap medium-strength high-toughness titanium alloy thick plate. The method comprises the following steps: 1, pressing and welding raw materials, and smelting to obtain an ultralow-gap TC4-DT cast ingot; secondly, cogging, upsetting, forging and air cooling are conducted after segmented heating; thirdly, upsetting and drawing forging and air cooling are conducted after heating and heat preservation; fourthly, upsetting and drawing forging and air cooling are conducted after heating and heat preservation; and 5, after heating and heat preservation, drawing-out shaping is carried out, and solid solution and aging are carried out. According to the method, a three-time vacuum self-consuming smelting method is adopted, large-deformation multiple upsetting and drawing forging is carried out above a beta-phase region, original coarse grains and tissues in the TC4-DT titanium alloy are fully crushed, a grain boundary alpha is lengthened and crushed, then large-deformation upsetting and drawing forging is carried out below the beta-phase region, recrystallization is promoted, the grains are fully refined, the tissues are uniform, and the high-strength and high-toughness TC4-DT titanium alloy is obtained. And the ultra-low-gap medium-strength high-toughness TC4-DT titanium alloy thick plate which is fine in grain, uniform in structure, high in fracture toughness, stable in performance and excellent in performance, and the strength, plasticity and toughness are matched is obtained.

Description

technical field [0001] The invention belongs to the technical field of titanium alloys, and in particular relates to a processing method for an ultra-low gap medium-strength and high-toughness titanium alloy thick plate. Background technique [0002] Titanium alloys represented by Ti-6Al-4V alloys have become the most mature and used materials in the field of aviation manufacturing due to their low density, high specific strength, good corrosion resistance, creep resistance and thermal stability. titanium alloy. The application of damage tolerant titanium alloys with high fracture toughness and low crack growth rate in large-scale load-bearing components of aircraft is becoming more and more common, such as Ti-6Al-4V ELI in the United States, TC4-DT and TC21 in my country, etc. Ti-6Al-4V ELI alloy is used in 73% of the titanium alloy structural parts of F-22 aircraft, and damage-tolerant titanium alloy forgings are used in various types of aircraft such as Airbus A380 and Bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C22C1/03C22C14/00C22B9/20C22F1/18B21C37/02
Inventor 侯红苗郭萍潘浩秦成张永强张菁丽
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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