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Method for laser shock assisted thermo-hydrogenation treatment of Ti6Al4V alloy

A technology of laser shock and hydrogen treatment, which is applied in the field of laser shock-assisted thermal hydrogen treatment of Ti6Al4V alloys, can solve the problems of uneven distribution of hydrogen elements, high hydrogen pressure, cracks, etc. The effect of grain refinement

Active Publication Date: 2020-06-26
JIANGSU UNIV
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Problems solved by technology

[0003] However, in the process of hydrogenation treatment, the hydrogen element diffuses inside the alloy from the surface to the inside, accumulates on the surface of the alloy and then goes deep into the interior, which may cause uneven distribution of hydrogen elements, or the hydrogen gas may be in the interior of the material due to the load. Higher hydrogen pressure builds up in the defect, resulting in hydrogen-induced cracking or hydrogen-induced bubbling

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  • Method for laser shock assisted thermo-hydrogenation treatment of Ti6Al4V alloy

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Effect test

example 1

[0023] Thermal Hydrogen Treatment Improves Properties of Titanium Alloys

[0024] Grind the Ti6Al4V sample, after ultrasonic cleaning, put it into the electronic balance for weighing, then put it into the tubular hydrogen treatment furnace, vacuumize the furnace and start the heating treatment furnace, raise the temperature to 750 ° C, and then pass into the furnace The volume fraction of 99.9% high-purity hydrogen gas increases the hydrogen pressure in the treatment furnace to 20kPa, and the holding time is 1h. After putting the hydrogen in, take out the titanium alloy sample, put it into the electronic balance again and weigh it, and calculate and confirm that the content of hydrogen element is 0.2wt%. Put the titanium alloy sample after hydrogenation into the heat treatment furnace, first raise the temperature of the furnace to 450°C, keep it for 10 minutes, then raise the temperature of the furnace to 850°C, keep it for 7 hours, stop the heat preservation and let it cool d...

example 2

[0026] Improvement of Properties of Titanium Alloy by Laser Shock-Hydrogen Combination

[0027] Grind the Ti6Al4V sample, after ultrasonic cleaning, put it into the electronic balance for weighing, then put it into the tubular hydrogen treatment furnace, vacuumize the furnace and start the heating treatment furnace, raise the temperature to 750 ° C, and then pass into the furnace The volume fraction of 99.9% high-purity hydrogen gas increases the hydrogen pressure in the treatment furnace to 20kPa, and the holding time is 1h. After putting the hydrogen in, take out the titanium alloy sample, put it into the electronic balance again and weigh it, and confirm that the content of hydrogen element is 0.2wt%. Then place the hydrogen-treated titanium alloy in a heat treatment furnace and perform the first laser shock. The parameters of the laser shock are pulse energy 2J, spot diameter 3mm, laser wavelength 1024nm, frequency 10Hz, and pulse width 20ns. , the spot overlapping rate i...

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Abstract

The invention belongs to the technical field of laser assisted thermal treatment, and particularly relates to a method for laser shock assisted thermo-hydrogenation treatment of a Ti6Al4V alloy. According to the method, hydrogenation treatment and laser shocks are combined, defects caused by diffusion of the hydrogen element in the hydrogenation treatment process are reduced by first laser shocks,further refining of grains of the alloy obtained after hydrogenation treatment is promoted through the combination of solid solution aging treatment and second laser shocks, and therefore the tensileproperty of the alloy is improved, the fatigue life of a material is prolonged, and the alloy has an excellent superplastic deformation characteristic.

Description

technical field [0001] The invention belongs to the technical field of laser-assisted heat treatment, and specifically relates to a method for laser shock-assisted thermal hydrogen treatment of Ti6Al4V alloys. The method can reduce defects caused by the diffusion of hydrogen elements in the process of hydrogenation treatment, and promote α+β in Ti6Al4V alloys. →Beta phase transformation process, refine the grain, improve the mechanical properties of Ti6Al4V alloy. Background technique [0002] Due to poor plasticity at room temperature, poor thermal conductivity, small elastic modulus, and severe work hardening of titanium alloys, its processing and application are greatly limited. Existing studies have shown that adding a certain amount of hydrogen to titanium alloys can promote the transformation of the phase transition process of titanium alloys (α+β→β), improve the shaping of titanium alloys and reduce their thermal deformation flow stress. [0003] However, in the proc...

Claims

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Application Information

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IPC IPC(8): C22F1/18C22F1/02C21D1/74C21D1/773C21D10/00
CPCC22F1/183C22F1/02C21D1/74C21D1/773C21D10/005
Inventor 程维戴峰泽徐刚鲁金忠
Owner JIANGSU UNIV
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