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Improved method for eliminating solidification cracks in slm-formed solid-solution-strengthened nickel-based alloys

A nickel-based alloy, solid solution strengthening technology, applied in the field of additive manufacturing engineering, can solve problems such as easy cracks, low degree of dendrite bonding, interdendritic liquid phase cannot flow freely and supplement shrinkage pores, etc.

Active Publication Date: 2022-03-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The study found that the cracks in the solid-solution-strengthened nickel-based alloy formed by laser selective melting are mainly formed in the mushy region during solidification. The degree of dendrite bonding in this region is low, and the interdendritic liquid phase cannot flow freely and supplement the shrinkage pores. Cracks are easily produced under the action of stress

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  • Improved method for eliminating solidification cracks in slm-formed solid-solution-strengthened nickel-based alloys
  • Improved method for eliminating solidification cracks in slm-formed solid-solution-strengthened nickel-based alloys
  • Improved method for eliminating solidification cracks in slm-formed solid-solution-strengthened nickel-based alloys

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Embodiment 1

[0036] This embodiment provides an improved method for eliminating the solidification cracks of SLM forming solid-solution strengthened nickel-based alloys, the method comprising the following steps:

[0037] In step S1, ZrN particles are used as the Zr source, ZrN and GH3230 powder are stirred and mixed in alcohol at a mass ratio of 1.5:98.5, and the mass fraction of Zr element introduced is calculated to be 1.3wt.%.

[0038] Step S2, drying the solid-liquid mixture obtained in step S1 at 80° C. for 4 hours.

[0039] In step S3, the mixed powder prepared in step S2 is formed by laser selective melting equipment to obtain an alloy sample. The forming parameters used are: laser power 180W, laser scanning speed 600mm / s, powder coating thickness 25um, and melting channel spacing 80um.

[0040] In step S4, light microscopy, scanning electron microscopy, transmission electron microscopy, and tensile performance verification are performed on the laser selective melting forming sampl...

Embodiment 2

[0044] This embodiment provides an improved method for eliminating the solidification cracks of SLM forming solid-solution strengthened nickel-based alloys, the method comprising the following steps:

[0045] In step S1, ZrB2 particles are used as the Zr source, ZrN and GH3230 powder are stirred and mixed in alcohol at a mass ratio of 1:99, and the mass fraction of Zr element introduced is calculated to be 0.8wt.%.

[0046] Step S2, drying the solid-liquid mixture obtained in step S1 at 80° C. for 4 hours.

[0047] In step S3, the mixed powder prepared in step S2 is formed by laser selective melting equipment to obtain an alloy sample. The forming parameters used are: laser power 180W, laser scanning speed 600mm / s, powder coating thickness 25um, and melting channel spacing 80um.

[0048] In step S4, light microscopy, scanning electron microscopy, and tensile performance verification are performed on the laser selective melting forming sample obtained in step S3.

[0049] Such...

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Abstract

The present invention provides an improved method for eliminating solid-solution strengthening nickel-based alloy solidification cracks formed by SLM, step S1, introducing Zr element into solid-solution strengthening nickel-based alloy powder to obtain mixed powder, and the content of the introduced Zr element is The mass fraction is 0.1~3wt.%; the Zr source for introducing Zr element is Zr simple substance or ZrH 2 or ZrB 2 or ZrN; step S2, preparing solid solution strengthened nickel-based alloy samples by using the mixed powder obtained in step S1 by selective laser melting. The present invention increases the content of interdendritic segregation liquid phase by introducing Zr element, alleviates the stress concentration of the solid-solution-strengthened nickel-based alloy formed by laser selective melting and solidification, and finally realizes the elimination of forming cracks. There is no solidification crack in the finally obtained structure, and the laser selective melting forming component with excellent mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing engineering, and particularly relates to an improved method for eliminating solidification cracks of a solid-solution-strengthened nickel-based alloy formed by SLM. Background technique [0002] As the most widely used additive manufacturing technology with high-precision forming, selective laser melting (SLM) has incomparable advantages in traditional subtractive manufacturing in the integrated manufacturing of complex structural parts and weight reduction of parts. Aerospace, medical equipment, energy and chemical industry have great application prospects. However, due to the unique layer-by-layer manufacturing characteristics of laser selective melting, the high-energy laser beam melts the powder material in a very short time. After the laser beam is removed, the microscopic molten pool solidifies under a very high temperature gradient. Due to the difference in shrinkage and exp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C19/03B22F10/28B33Y10/00
CPCC22C1/058C22C19/03B22F10/28B33Y10/00Y02P10/25
Inventor 马宗青赵亚楠程晓鹏刘永长
Owner TIANJIN UNIV