Method for regulating and controlling microstructure of directional energy additive manufacturing titanium alloy part

A technology of additive manufacturing and microstructure, applied in additive manufacturing, additive processing, etc., can solve the problems of increased difficulty in temperature gradient control, difficulty in obtaining titanium alloy products, and increased difficulty in tissue control, achieving good application prospects and avoiding holes Defect issues, effects of avoiding multiple trials

Active Publication Date: 2022-04-15
SHANGI INST FOR ADVANCED MATERIALSNANJING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using the preheating method to regulate the temperature gradient in the additive manufacturing process, the effect on tissue regulation is not obvious when the preheating temperature is low, and the internal temperature of the equipment will increase when the preheating temperature is high, causing damage to water and electrical components. , and there are requirements for the size of the product to be prepared, it is more suitable for thin-walled parts. When the product is not a thin-walled product, the heat in the central part will mainly be transmitted to the lower temperature substrate through heat conduction, and the difficulty of temperature gradient control will increase. , the difficulty of tissue control increases, and it is difficult to obtain titanium alloy products with the desired structure

Method used

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  • Method for regulating and controlling microstructure of directional energy additive manufacturing titanium alloy part
  • Method for regulating and controlling microstructure of directional energy additive manufacturing titanium alloy part
  • Method for regulating and controlling microstructure of directional energy additive manufacturing titanium alloy part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] Step 1: Prepare a TC4 substrate with a thickness of 15mm and a TC4 spherical powder with a specification of 75-180μm.

[0123] Step 2: Position the TC4 substrate and the laser head, seal the device, and fill it with argon gas with a purity of 99.999% to reduce the oxygen content inside the device to below 200ppm.

[0124] Step 3: Set the scanning speed to 600mm / min, the initial powder feeding speed to 4.5g / min, and the laser power to 1200W, and conduct a single-channel test. The measured width of the melting channel is about 2.8mm, and the height of the melting channel is about 0.7mm. Among them, the cladding layer The height is about 0.4mm.

[0125] Step 4: Repeat steps 1 and 2 to prepare equipment and TC4 powder.

[0126] Step 5: Set the laser power to 1200W, the laser scanning spacing to 600mm / min, the laser scanning spacing to 1.6mm (the lateral overlap rate is 43%), the scanning strategy is reciprocating, and 90° rotation between layers, through The actual claddi...

Embodiment 2

[0129] Step 1: Prepare a TC4 substrate with a thickness of 15mm and a TC4 spherical powder with a specification of 75-180μm.

[0130] Step 2: Position the TC4 substrate and the laser head, seal the device, and fill it with argon gas with a purity of 99.999% to reduce the oxygen content inside the device to below 200ppm.

[0131] Step 3: Set the scanning speed to 600mm / min, the initial powder feeding speed to 4.5g / min, and the laser power to 1200W, and conduct a single-channel test. The measured width of the melting channel is about 2.8mm, and the height of the melting channel is about 0.7mm. Among them, the cladding layer The height is about 0.4mm.

[0132] Step 4: Repeat steps 1 and 2 to prepare equipment and raw materials.

[0133]Step 5: Set the laser power to 1200W, the laser scanning spacing to 600mm / min, the laser scanning spacing to 1.68mm (the lateral overlap rate is 40%), the scanning strategy is reciprocating, and the interlayer 90 ° rotation, through The actual cl...

Embodiment 3

[0136] Step 1: Prepare a TC4 substrate with a thickness of 15mm and a TC4 spherical powder with a specification of 75-180μm.

[0137] Step 2: Position the TC4 substrate and the laser head, seal the device, and fill it with argon gas with a purity of 99.999% to reduce the oxygen content inside the device to below 200ppm.

[0138] Step 3: Set the scanning speed to 600mm / min, the initial powder feeding speed to 4.5g / min, and the laser power to 1200W, and conduct a single-channel test. The measured width of the melting channel is about 2.8mm, and the height of the melting channel is about 0.7mm. Among them, the cladding layer The height is about 0.4mm.

[0139] Step 4: Repeat steps 1 and 2 to prepare equipment and raw materials.

[0140] Step 5: Set the laser power to 1200W, the laser scanning spacing to 600mm / min, the laser scanning spacing to 1.68mm (the lateral overlap rate is 40%), the scanning strategy is reciprocating, and the interlayer 90 ° rotation, through The actual c...

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Abstract

According to the method for regulating and controlling the microstructure of the directional energy additive manufacturing titanium alloy part, the laser scanning distance and the cladding layer thickness can be precisely regulated and controlled to reduce the energy density in the titanium alloy forming process, part of metal powder is not melted, and therefore the unmelted metal powder serves as nucleation particles in the solidification process. According to the method, the thermal condition of the titanium alloy in the directional energy deposition process is improved through process regulation and control, the energy density of laser directional energy deposition is reduced, then the grain morphology of the titanium alloy is improved, thick columnar crystals are avoided, and the purpose of improving the microstructure of the directional energy deposition titanium alloy is achieved.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing of metal parts, in particular to a method for regulating the microstructure of titanium alloy parts manufactured by directed energy additive manufacturing. Background technique [0002] Directed energy deposition mainly uses laser, arc, plasma, electron beam and other energy sources to heat metal powder or wire, and manufacture parts layer by layer. However, no matter how the light source and product form change, the metallurgical characteristics of the solidification process are basically the same: metal Under the action of a concentrated heat source, the micro-area is rapidly heated, quenched and solidified quickly, and then undergoes multi-cycle, variable cycle, intense heating and cooling during the layer-by-layer deposition process. Adjacent layers or several layers undergo cyclic remelting and cooling, and other cladding layers The grains are then subjected to cyclic micro-hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/28B22F10/85B22F10/366B33Y10/00B33Y50/02
CPCY02P10/25
Inventor 梁祖磊刘志琪王健李永华陈小龙
Owner SHANGI INST FOR ADVANCED MATERIALSNANJING CO LTD
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