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Microstructure regulation and control method for high-energy beam metal additive manufacturing

A microstructure and metal additive technology, which is applied in the direction of additive manufacturing, additive processing, and energy efficiency improvement, and can solve problems that do not involve dual heat source processes

Active Publication Date: 2016-06-22
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above two patents only achieve the preheating effect by adding induction heating on the basis of laser single heat source forming, and do not involve the method of matching the dual heat source process to control the forming temperature field, and the controllability of the temperature field is precisely the microstructure basis of control

Method used

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  • Microstructure regulation and control method for high-energy beam metal additive manufacturing
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  • Microstructure regulation and control method for high-energy beam metal additive manufacturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Step 1. Set the target solidification structure of TC4 as small columnar crystals and equiaxed crystal inclusions, and the aspect ratio of the phase structure to 1-50, and select the laser induction composite forming process parameters.

[0043] Step 2. This time the formed part is a thin-walled part, so a rectangular coil made of a copper tube with a diameter of 10 mm is selected and the distance between the coil and the formed part is set at 10 mm. Install the selected coil on the induction heater.

[0044] Step 3: Put the TC4 powder into the powder feeder, and put the TC4 substrate plate into the argon-filled inert atmosphere processing chamber, where the oxygen content during the additive manufacturing process is kept below 100 ppm;

[0045] Step 4. Set the scanning path on the CNC system and confirm that the scanning speed is 2000mm / min. Turn on the powder feeder and set the powder feed rate to 40g / min. Set the laser power to 8000W, the spot diameter to 7mm, the inducti...

Embodiment 2

[0049] Step 1. Set the coarse columnar crystals of the TC4 target solidified structure epitaxial growth, and the phase structure aspect ratio is 100-1000, and thus select the laser induction composite forming process parameters.

[0050] Step 2. This time the formed part is a thin-walled part, so a rectangular coil made of a copper tube with a diameter of 3mm is selected and the distance between the coil and the formed part is set at 5mm. Install the selected coil on the induction heater.

[0051] Step 3: Put the TC4 powder into the powder feeder, and put the TC4 substrate plate into the argon-filled inert atmosphere processing chamber, where the oxygen content during the additive manufacturing process is kept below 100 ppm.

[0052] Step 4. Set the scan path on the CNC system and determine the scan speed to be 300mm / min. Turn on the powder feeder and set the powder feed rate to 2g / min. Set the laser power to 300W, the spot diameter to 2.9mm, the induction heating power to 30KW, an...

Embodiment 3

[0056] Step 1. Set the GH4169 target solidified structure epitaxially grown coarse columnar crystals, and obtain the γ+δ phase, with an aspect ratio of 0.25 to 0.30, and select the laser induction composite forming process parameters.

[0057] Step 2. This time the formed part is a three-dimensional part, so a circular coil with a diameter of 2 cm is made from a copper tube with a diameter of 4 mm and the distance between the coil and the processing plane is set at 5 mm. Install the selected coil on the induction heater.

[0058] Step 3: Put the GH4169 powder into the powder feeder, and put the GH4169 base plate into the argon-filled inert atmosphere processing chamber, where the oxygen content during the additive manufacturing process is kept below 100 ppm;

[0059] Step 4. Set the scan path on the CNC system and determine the scan speed to be 700mm / min. Turn on the powder feeder and set the powder feed rate to 20g / min. Set the laser power to 2200W, the spot diameter to 3mm, the i...

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Abstract

The invention discloses a microstructure regulation and control method for high-energy beam metal additive manufacturing. The method particularly comprises the following steps: step 1, setting a high-energy beam matched with a to-be-formed target material as well as temperature field regulation and control parameters involved in induction heating and double-heat-source synchronous heating according to the shape as well as the solidification phase and the microstructure of the to-be-formed target material; and step 2, putting the to-be-formed target material in a feeding device, putting a substrate of the to-be-formed target material in an argon-filled inert atmosphere processing chamber, and carrying out additive manufacturing to form the target material according to the processing parameters set in step 1, wherein the oxygen content in the process of carrying out additive manufacturing to form the target material is kept to be 100 ppm or below. The method provided by the invention has the advantages that such heat behaviors as the temperature gradient of a molten pool and surrounding areas as well as the solidification velocity of the molten pool can be regulated and controlled under the coupling action of the high-energy beam and synchronous induction heating, so as to control the forming of a solidification structure and a micro-phase structure of the formed target material, such as the microscopic morphology, the size and the like.

Description

Technical field [0001] The invention belongs to the technical field of metal material microstructure control, and relates to a microstructure control method for high-energy beam metal additive manufacturing. Background technique [0002] As we all know, the performance of a material is determined by its microstructure. With the vigorous development of my country's aerospace industry, higher requirements have been placed on the performance of the material. Aero-engine turbine blades developed from the initial forged blades to vacuum investment casting blades. In the 1960s, directional solidification casting was used to replace the original ordinary casting. The blade structure also developed from the original equiaxed crystal to the columnar crystal. At present, the turbine blades of the combustion chamber of aero-engines all adopt single crystal structure. This is because even if the same material has a different internal organizational structure, the performance of the material...

Claims

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Application Information

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IPC IPC(8): B22F3/105B33Y10/00
CPCB33Y10/00B22F2003/1053B22F10/00B22F10/38B22F12/10B22F10/25B22F10/36B22F10/32Y02P10/25
Inventor 谭华范伟林鑫陈静杨海欧黄卫东
Owner NORTHWESTERN POLYTECHNICAL UNIV
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