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High-temperature alloy additive manufacturing method

A superalloy and additive manufacturing technology, applied in the directions of additive manufacturing, additive processing, and energy efficiency improvement. Improve the comprehensive mechanical properties, the effect of high complexity

Active Publication Date: 2018-03-13
ADVANCED FOR MATERIALS & EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under normal circumstances, the welding process will generate thermal stress at the welding position, and IN939 superalloy components are more prone to warping and deformation due to internal stress release, and even cause cracking of the IN939 alloy, which affects the comprehensive mechanics of superalloy components. performance

Method used

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  • High-temperature alloy additive manufacturing method

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Experimental program
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Effect test

Embodiment 1

[0041] (1) The material is IN939 superalloy powder, the powder particle size range is 15-53μm, where d 10 Controlled at 18μm, d 50 Controlled at 30μm, d 90 Controlled at 45μm;

[0042] (2) Slice the three-dimensional model of the part to be formed, with a slice thickness of 15 μm; plan the scanning path of the component, use the nine-square grid method to scan, the area size is 4*4mm, and the deflection angle when scanning layer by layer, the deflection angle is 36°;

[0043] (3) Laser selective melting equipment adopts a combination of vacuuming and replacement. Firstly, the vacuum is pumped to 80KPa, and then high-purity Ar gas is filled into the molding chamber, and the replacement is repeated several times until the oxygen content of the molding chamber is lower than 100ppm and the pressure is maintained. Start printing at 30mbar; avoid powder oxidation;

[0044] Selective laser melting process: the laser power for scanning the entity is 300W, the laser power for scanni...

Embodiment 2

[0050] (1) The material is IN939 superalloy powder, the powder particle size range is 15-53μm, where d 10 Controlled at 21μm, d 50 Controlled at 33μm, d 90 Controlled at 48μm;

[0051] (2) Slice the 3D model of the part to be molded, with a slice thickness of 25 μm; plan the scanning path of the component, use the nine-square grid method to scan, the area size is 4*4mm, and the deflection angle is 37° when scanning layer by layer;

[0052] (3) Laser selective melting equipment adopts a combination of vacuuming and replacement. Firstly, the vacuum is pumped to 80KPa, and then high-purity Ar gas is filled into the molding chamber, and the replacement is repeated several times until the oxygen content of the molding chamber is lower than 100ppm and the pressure is maintained. Start printing at 30mbar;

[0053] Selective laser melting process: the laser power for scanning the entity is 350W, the laser power for scanning the contour is 180W, the laser power for the support is 350W...

Embodiment 3

[0059] (1) The material is IN939 superalloy powder, the powder particle size range is 15-53μm, where d 10 Controlled at 24μm, d 50 Controlled at 36μm, d 90 Controlled at 51μm;

[0060] (2) Slicing the 3D model of the part to be formed, with a slice thickness of 30 μm; planning the scanning path of the component, using the nine-square grid method to scan, the area size is 4*4mm, and the deflection angle when scanning layer by layer, the deflection angle is 40°;

[0061] (3) Laser selective melting equipment adopts a combination of vacuuming and replacement. Firstly, the vacuum is pumped to 80KPa, and then high-purity Ar gas is filled into the molding chamber, and the replacement is repeated several times until the oxygen content of the molding chamber is lower than 100ppm and the pressure is maintained. Start printing at 30mbar;

[0062] Selective laser melting process: the laser power for scanning the entity is 400W, the laser power for scanning the contour is 200W, the las...

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Abstract

The invention provides a high-temperature alloy additive manufacturing method. The high-temperature alloy additive manufacturing method comprises the following steps: a raw material high-temperature alloy powder is prepared, the fluidity is controlled to be less than or equal to 25s / 50g; a three-dimensional model of a high-temperature alloy component to be formed is treated in a slicing mode, andthe preset slicing thickness is set; the scanning path of the high-temperature alloy component is planned, and a preset deflection angle is set during layer-by-layer scanning; a laser selective melting process parameter is set, and meanwhile a substrate is preheated; a layer of raw material high-temperature alloy powder with the thickness of the preset powder thickness is evenly laid on the substrate through a powder spreading mechanism, a laser beam is used for rapidly melting the powder according to the slice shape and the scanning path, the powder is stacked layer by layer until the high-temperature alloy component is completely formed, and the high-temperature alloy component is placed for 2-3h in a forming cavity after printing is completed; and heat treatment on the taken-out high-temperature alloy component is done. The near-net forming of the high-performance high-temperature alloy component can be realized, the comprehensive mechanical property of a printing component reachesthe level of a forge piece, and thus the comprehensive mechanical property of the high-temperature alloy component is improved.

Description

technical field [0001] The invention relates to the technical field of metal additive manufacturing, and more specifically, to a method for additive manufacturing of superalloys. Background technique [0002] Nickel-based superalloys have excellent high temperature resistance, oxidation resistance, and corrosion resistance, and can be widely used in high temperature and corrosion resistant key components such as gas turbine guide vanes. IN939 alloy is a γ' strengthened nickel-based superalloy, which can be endowed with excellent high-temperature mechanical properties, such as good tensile strength and creep resistance, by several heat treatments, but also reduces the weldability of the alloy. [0003] New components, such as turbine blades and ring segments, are prepared using traditional processes, which must use welding processes during manufacture and during repair. However, under normal circumstances, the welding process will generate thermal stress at the welding posit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105C22F1/10B33Y10/00
CPCC22F1/10B33Y10/00B22F10/00B22F10/36B22F10/28B22F10/64B22F10/366B22F12/17B22F10/32Y02P10/25
Inventor 戴煜谭兴龙李礼杨文
Owner ADVANCED FOR MATERIALS & EQUIP
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