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A process parameter optimization method for laser selective melting of high-entropy alloys

A technology of laser selective melting and process parameter optimization, applied in the field of alloy materials, it can solve the problems of inability to process optimization, inability to describe the instantaneous molten pool state, without considering the instantaneous molten pool energy density, etc., and achieve the effect of accurate optimization results.

Active Publication Date: 2022-07-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the energy density of the instantaneous molten pool is not considered, and the volume energy density can only represent the average energy density input per unit volume after printing.
Does not describe the state of the instantaneous molten pool and therefore cannot be successfully optimized for the process

Method used

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  • A process parameter optimization method for laser selective melting of high-entropy alloys
  • A process parameter optimization method for laser selective melting of high-entropy alloys
  • A process parameter optimization method for laser selective melting of high-entropy alloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The printing powder is FeCoCrNi and other atomic concentration powder with a particle size of 15-48 microns. A 316L plate was used as the SLM substrate with a size of 250mm×250mm×15mm, and the oil and dirt on the surface were cleaned with acetone and alcohol respectively. Sandblast the surface with a sandblaster.

[0041] The AM-400 laser 3D printing equipment produced by Renishaw Company was used for printing, and a block with a size of 5mm×5mm×5mm was constructed in the software Renishaw-QuantAM that comes with the Renishaw equipment. The layer thickness is 40 microns, and the interlayer rotation angle is 67° to release residual stress. Before printing, the printing chamber is evacuated, the oxygen content is less than 500 ppm, and argon gas is used for protection. After printing, the specimen is cooled with the chamber for 2 hours.

[0042] In this experimental example, three main process parameters of power, exposure time, and line-to-point distance are used for pr...

Embodiment 1

[0053] The optical microscope photo of the sample printed by laser selective melting with the optimized process parameters of Example 1 is shown in figure 1 a, Scanning electron microscope morphology of tensile fracture figure 1 b.

[0054] The energy density can be calculated by the following formula: VED=PT / H 2 L

[0055] VED is energy density J / mm 3 , L is the layer thickness of 40 μm, and the following comparative examples select the parameter combination with the same energy density as the optimized process combination.

Embodiment 2

[0081] The printing powder is FeCoCrNiMn and other atomic concentration powder with a particle size of 15-48 microns. A 316L plate was used as the SLM substrate with a size of 250mm×250mm×15mm, and the oil and dirt on the surface were cleaned with acetone and alcohol respectively. Sandblast the surface with a sandblaster.

[0082] The AM-400 laser 3D printing equipment produced by Renishaw Company was used for printing, and a block with a size of 5mm×5mm×5mm was constructed in the software Renishaw-QuantAM that comes with the Renishaw equipment. The layer thickness is 40 microns, and the interlayer rotation angle is 67° to release residual stress. Before printing, the printing chamber is evacuated, the oxygen content is less than 500 ppm, and argon gas is used for protection. After printing, the specimen is cooled with the chamber for 2 hours.

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Abstract

The invention discloses a method for optimizing process parameters of high-entropy alloy laser selective melting, comprising: step 1, using a laser selective melting method to print a high-entropy alloy sample. , the intersection experiment of three process parameters of line point distance; step 2, detect the relative density of the high-entropy alloy sample obtained in step 1; step 3, compare the relative density obtained in step 2 with the corresponding power and exposure in step 1 Perform polynomial fitting on the three process parameters of time and line point distance. The polynomial should be composed of the 3rd order, 2nd order, 1st order and interaction terms of these three parameters respectively; Step 4, to the fitted polynomial The extreme value of the relative density is solved, and the power, exposure time, and line-to-point distance corresponding to the extreme value of the relative density are the optimal process parameters. By using the present invention, more accurate optimization results can be obtained than the traditional optimization process.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, in particular to a method for optimizing process parameters of high-entropy alloy laser selective melting. Background technique [0002] The concept of high-entropy alloys (HEAs) is a new alloy design concept that has been proposed in recent years. Different from traditional alloys with single or two principal elements, they are usually composed of 5 or more elements, and the content of each element is between 5% and 35%, and the most common is equimolar ratio mixing. of high-entropy alloys. Such alloys are designed in such a way that the entropy in the alloy system is sufficiently increased, hence the name HEAs. HEAs have a series of excellent properties, such as higher hardness, higher tensile strength, wear resistance and corrosion resistance. [0003] Laser additive manufacturing technology has received more and more attention in recent years due to its advantages in the manufactur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B22F10/28B22F10/366B33Y50/02B33Y70/00
CPCB33Y50/02B33Y70/00Y02P10/25
Inventor 徐连勇林丹阳荆洪阳韩永典赵雷吕小青
Owner TIANJIN UNIV
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