Selective laser melting forming method of hot-crack-free precipitation strengthened high-temperature alloy

A technology of selective laser melting and precipitation strengthening, applied in the direction of additive processing, etc., can solve the problems of small 3D printing process window, inability to guarantee process stability, weakening of material strength, etc., achieve high versatility, flexible and convenient production, and improve mechanics performance effect

Active Publication Date: 2020-11-20
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for superalloys used at high temperatures, the grain boundary is the weakening link of the material strength, and the traditional method of refining grains to suppress cracks is not feasible
[0004] Although some research work has been carried out at home and abroad to improve the thermal cracking of cast superalloys through selective laser melting forming and some achievements have been made (Rapid Prototyping Journal, 2017.), but for the same alloy powder from different suppliers or the same supplier Different batches of alloy powder raw materials and 3D printing equipment need to re-explore the appropriate process parameters
In addition, for precipitation-strengthened superalloys with high aluminum + titanium content, the process window of 3D printing is extremely small, and the process stability cannot be guaranteed.

Method used

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  • Selective laser melting forming method of hot-crack-free precipitation strengthened high-temperature alloy
  • Selective laser melting forming method of hot-crack-free precipitation strengthened high-temperature alloy
  • Selective laser melting forming method of hot-crack-free precipitation strengthened high-temperature alloy

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Effect test

Embodiment 1

[0043] This embodiment provides a selective laser melting forming method for athermal crack precipitation strengthening superalloy, the method includes the following steps:

[0044] Among them, the present embodiment prepares a kind of such as figure 1 The tensile test piece shown is made of IN738LC precipitation-strengthened superalloy.

[0045] (1) Mix IN738LC precipitation-strengthened high-temperature alloy powder with a particle size D90 of 40 μm and demelting element particles (hafnium elemental powder) with a particle size of 1 to 5 μm at a mass ratio of 99:1 to obtain a mixed powder;

[0046] (2) Vacuumize the cavity of the selective laser melting equipment to 10 -3 Pa, filled with high-purity argon, repeated 3 times, the mixed powder described in step (1) was added into the molding cavity to form a powder layer with a thickness of 30 μm, the powder layer was preheated to 200 ° C, and the The mixed powder is melted and formed. The power of the laser is 230w, the beam...

Embodiment 2

[0049] This embodiment provides a selective laser melting forming method for athermal crack precipitation strengthening superalloy, the method includes the following steps:

[0050] Among them, the present embodiment prepares a kind of such as figure 1 The tensile test piece shown is made of IN738LC precipitation-strengthened superalloy.

[0051] (1) Mix IN738LC precipitation-strengthened high-temperature alloy powder with a particle size D90 of 40 μm and demelting element particles (hafnium elemental powder) with a particle size of 1 to 5 μm at a mass ratio of 99:1 to obtain a mixed powder;

[0052] (2) Vacuumize the cavity of the selective laser melting equipment to 10 -3 Pa, filled with high-purity argon, repeated 3 times, the mixed powder described in step (1) was added into the molding cavity to form a powder layer with a thickness of 30 μm, the powder layer was preheated to 200 ° C, and the The mixed powder is melted and formed. The power of the laser is 230w, the beam...

Embodiment 3

[0055] This embodiment provides a selective laser melting forming method for athermal crack precipitation strengthening superalloy, the method includes the following steps:

[0056] Among them, the present embodiment prepares a kind of such as Figure 4 The cubic shape shown (10×10×10mm 3 ) specimen, the material is IN738LC precipitation strengthened superalloy.

[0057] (1) Mix IN738LC precipitation-strengthened high-temperature alloy powder with a particle size D90 of 40 μm and demelting element particles (hafnium elemental powder) with a particle size of 1-5 μm at a mass ratio of 98:2 to obtain a mixed powder;

[0058] (2) Vacuumize the cavity of the selective laser melting equipment to 10 -3 Pa, filled with high-purity argon, repeated 3 times, the mixed powder described in step (1) was added into the molding cavity to form a powder layer with a thickness of 30 μm, the powder layer was preheated to 200 ° C, and the The mixed powder is melted and formed. The power of the ...

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Abstract

The invention provides a selective laser melting forming method of a hot-crack-free precipitation strengthened high-temperature alloy. The method comprises the step of mixing precipitation strengthened high-temperature alloy powder with melt-reducing element particles before laser melting. The method can remarkably solve the problem of thermal cracking of the selective laser melting forming precipitation strengthened high-temperature alloy, and the mechanical property of the alloy is improved.

Description

technical field [0001] The invention belongs to the field of metal additive manufacturing, and relates to a laser melting forming method, in particular to an area-selective laser melting forming method for athermal crack precipitation strengthening superalloy. Background technique [0002] Selective laser melting technology is an important branch of the metal 3D printing family. It can use laser to directly melt metal powder locally to realize rapid and precise forming of complex parts, and has realized some metal structural materials (such as stainless steel, high-strength steel, forged superalloy, etc.) of forming. However, there are great difficulties in the manufacture of complex precision components of precipitation-strengthened cast superalloys, which are widely used in high-end fields such as aerospace and energy industries and can work at higher temperatures. In order to improve the high-temperature mechanical properties, precipitated superalloys mainly use g’ phase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y70/00B33Y10/00B33Y40/10
CPCB33Y70/00B33Y10/00B33Y40/10Y02P10/25
Inventor 郁峥嵘朱强李欣蔚胡小刚刘朝阳曹丽洁徐振
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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