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Friction stir treatment method capable of improving ductility of selective laser melting Ti6Al4V block

A technology of friction stir and laser melting, which is applied in the direction of non-electric welding equipment, welding equipment, metal processing equipment, etc., can solve problems such as reduction, and achieve the effects of improving ductility, reducing porosity, and reducing strength

Inactive Publication Date: 2019-05-14
SICHUAN UNIV
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Problems solved by technology

[0005] In view of the problems of porosity and a large number of needle-like α' structures in the current SLM block, the purpose of the present invention is to select a post-processing method of friction stir processing to modify the selective laser melting Ti6Al4V alloy block to reduce the porosity of the material rate, homogenize the local tissue structure, so as to obtain the performance of both high ductility and strength

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  • Friction stir treatment method capable of improving ductility of selective laser melting Ti6Al4V block
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  • Friction stir treatment method capable of improving ductility of selective laser melting Ti6Al4V block

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[0026] The present invention will be further described below in conjunction with the above-mentioned optimized process parameters, but the present invention is not limited thereby.

[0027] Titanium powder with an average particle size of 33.8 μm was selected, and a laser power of 280W and a scanning speed of 1200mm / s were used to additively manufacture a 60×40×3mm 3 Ti6Al4V substrate. The surface of the substrate is milled to remove impurities such as surface oxides; then the substrate to be modified is placed in an acetone solution, and the oil on the surface of the substrate is cleaned by ultrasonic waves. Using friction stir processing, the welding forward speed is 75mm / min, the rotation speed is 400rpm, and the SLM Ti6Al4V substrate is post-processed under an argon protective atmosphere.

[0028] Utilize the present invention to carry out the porosity of the Ti6Al4V alloy bulk material of SLM material post-treatment to significantly reduce, and structure such as Figure ...

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Abstract

The invention relates to an aftertreatment process of the selective laser melting Ti6Al4V block, in particular to a friction stir treatment method capable of improving ductility of a selective laser melting Ti6Al4V block. Atomized titanium powder with the average grain size being 33.8 micrometers is selected, an EOS M290 device is adopted for additive manufacturing of a Ti6Al4V base plate, and thesize is 60*40*3 mm<3>. During the test, optimized SLM parameters are selected; the printed SLM Ti6Al4V base plate surface is subjected to oxide, impurity and oil stain clearing; friction stir processing modified post-treatment is carried out, a friction stir welding device is adopted for carrying out local friction stir processing modification treatment on the Ti6Al4V base plate. The porosity ofthe original SLM block can be obviously reduced, the microscopic structure in the material is changed, the ductility of the SLM Ti6Al4V alloy is greatly improved, and the material strength cannot be greatly reduced.

Description

technical field [0001] The invention relates to a post-treatment process of selective laser melting Ti6Al4V bulk material, in particular to a friction stirring treatment method for improving the ductility of selective laser melting Ti6Al4V bulk material. Background technique [0002] Ti6Al4V titanium alloy has a series of advantages such as excellent corrosion resistance, low density, high specific strength, good toughness and weldability, and is widely used in aerospace, petrochemical, marine automobile, biomedicine and other fields. Selective laser melting is an advanced metal additive manufacturing technology that can be used for the manufacture of parts such as titanium alloys with complex geometric structures, and has shown great advantages in the aerospace, biomedical and automotive industries. However, the low ductility of selective laser melting (SLM) bulk materials compared with wrought or cast titanium alloys seriously hinders their wider application in industrial ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/22B23K20/26
Inventor 黄春杰赵吕闫星辰张磊刘剑王卫兵刘敏
Owner SICHUAN UNIV
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