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High-entropy alloy selective laser melting process parameter optimization method

A technology of laser selective melting and process parameter optimization, which is applied in the field of alloy materials, can solve the problems of inability to optimize the process, not consider the energy density of the instantaneous molten pool, and cannot describe the state of the instantaneous molten pool, etc., and achieve the effect of accurate optimization results

Active Publication Date: 2021-07-13
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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  • High-entropy alloy selective laser melting process parameter optimization method
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The printing powder material is an atomic concentration powder such as Fecocrni with a particle size of 15 to 48 microns. The 316L sheet is used as the SLM substrate, with a size of 250 mm × 250 mm × 15 mm, and the surface of the surface is cleaned with acetone and alcohol. Surrideration machine is used to perform surface sandblasting.

[0041] Printing using the AM-400 laser 3D printing equipment produced by Renisha's company, the size of 5mm × 5 mm × 5 mm is constructed in the renishaw-quantam of the Renishaw device. The layer thickness is 40 microns, and the horizontal rotation angle is 67 ° to release the residual stress, and the print pad is removed before printing. The oxygen content is less than 500 ppm, and argon is protected. After printing, the test piece is counted for 2 hours.

[0042] This experimental embodiment uses power, exposure time, and line points from three main process parameters. Firstly, 200 groups of experiments on the three process parameters are ...

Embodiment 1

[0054] Example 1 Optimized Process Parameters Performing a Sample Optical Microscope Photo of Melting Printing Out of Laser Selection figure 1 A, pull-out, scanning electron microscope figure 1 b.

[0055] The energy density can be calculated by the following formula: ved = pt / h 2 L

[0056] VED is the energy density J / mm 3 , L is a layer thickness of 40 μm, and the following comparative selection is a parameter combination with the same energy density as the optimized process.

Embodiment 2

[0082] The printing powder material is an atomic concentration powder such as Fecocrnimn and a particle size of 15 to 48 microns. The 316L sheet is used as the SLM substrate, with a size of 250 mm × 250 mm × 15 mm, and the surface of the surface is cleaned with acetone and alcohol. Surrideration machine is used to perform surface sandblasting.

[0083] Printing using the AM-400 laser 3D printing equipment produced by Renisha's company, the size of 5mm × 5 mm × 5 mm is constructed in the renishaw-quantam of the Renishaw device. The layer thickness is 40 microns, and the horizontal rotation angle is 67 ° to release the residual stress, and the print pad is removed before printing. The oxygen content is less than 500 ppm, and argon is protected. After printing, the test piece is counted for 2 hours.

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Abstract

The invention discloses a high-entropy alloy selective laser melting process parameter optimization method. The method comprises the following steps: 1, printing a high-entropy alloy sample by adopting a selective laser melting method which is a cross-over experiment of randomly selecting or specifying three process parameters of power, exposure time and line-dot pitch; 2, detecting the relative density of the high-entropy alloy sample obtained in the step 1; 3, performing polynomial fitting on the relative density obtained in the step 2 and the corresponding three process parameters of the power, the exposure time and the line-dot pitch in the step 1, wherein a polynomial is composed of a cubic term, a quadratic term, a first term and an interactive term about the three parameters respectively; and 4, performing extreme value solving of the relative density on the fitted polynomial, wherein the power, the exposure time and the line-dot pitch corresponding to the extreme value of the relative density are the optimal process parameters. By using the method, an optimization result which is more accurate than that of a traditional optimization process can be obtained.

Description

Technical field [0001] The present invention belongs to the field of alloy material, and more particularly to a high entropy alloy laser selection method of melting process parameter optimization method. Background technique [0002] The concept of high entropy alloy (HEAS) is a new alloy design concept proposed in recent years. Unlike traditional alloys in the past main or two main elements, it is usually composed of five or more elements, and the content of each element is between 5% and 35%, the most common is equal molar ratio mixing High entropy alloy. This alloy design can sufficiently increase the entropy value in the alloy system, so it is called Heas. Heas has a range of excellent properties, such as higher hardness, large tensile strength, wear resistance, and corrosion resistance. [0003] Because of its adoption of complex structural parts manufacturing, near net molding, laser additives has become a research focus in high entropy alloy preparation in recent years in ...

Claims

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Application Information

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Patent Type & Authority Applications(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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