A method for eliminating holes in alloy structural steel by laser deposition

A laser deposition and structural steel technology, applied in metal material coating process, coating, additive manufacturing, etc., can solve problems such as deposition holes, and achieve the effect of dense and uniform structure, improved utilization rate, and improved mechanical properties

Active Publication Date: 2020-11-13
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] In order to solve the defect problem of deposition holes in the laser additive manufacturing of large-scale high-performance structural steel parts, the purpose of the present invention is to provide a method for eliminating the laser deposition holes of alloy structural steel, which uses mixed active powder to suppress the generation of holes, and realizes laser deposition of alloy steel. Deposits non-porous structure and good mechanical properties

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  • A method for eliminating holes in alloy structural steel by laser deposition
  • A method for eliminating holes in alloy structural steel by laser deposition
  • A method for eliminating holes in alloy structural steel by laser deposition

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Experimental program
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Effect test

Embodiment 1

[0031] In this embodiment, the specific steps of the laser deposition hole elimination method for alloy structural steel are as follows:

[0032] 1. Alloy structural steel powder particle size is 100-250 mesh, sphericity ≥ 93%, oxygen content ≥ 500PPM; Ni, Cr, Nb powder particle size is 100-250 mesh, sphericity ≥ 94%, chemical composition purity 99.99 More than wt%, oxygen content ≤ 500PPM. Among them, the alloy grade of the alloy structural steel powder is 12CrNi2.

[0033] 2. Take a powder of pure Cr and mix it into the alloy steel powder at a ratio of 4wt%. Calculated by weight percentage, the ratio of Cr powder to the entire mixed alloy steel powder is 4%.

[0034] 3. Drying treatment of mixed powder: temperature 100℃×1.5h.

[0035] 4. Deposition substrate: 12CrNi2 alloy structural steel.

[0036] 5. Laser deposition vacuum glove box environment: H 2 O, O 2 ≤50PPM.

[0037] 6. Process parameters of laser deposition: continuous laser irradiation, laser power 900W, pow...

Embodiment 2

[0043] In this embodiment, the specific steps of the laser deposition hole elimination method for alloy structural steel are as follows:

[0044] 1. Alloy structural steel powder particle size is 100-250 mesh, sphericity ≥ 93%, oxygen content ≥ 500PPM; Ni, Cr, Nb powder particle size is 100-250 mesh, sphericity ≥ 94%, chemical composition purity 99.99 More than wt%, oxygen content ≤ 500PPM. Among them, the alloy grade of the alloy structural steel powder is 12CrNi2.

[0045] 2. Two kinds of powders of pure Ni and Cr are mixed into the alloy steel powder at a ratio of 1wt%, respectively. Calculated by weight percentage, the ratio of Ni and Cr powder to the whole mixed alloy steel powder is 2%.

[0046] 3. Drying treatment of mixed powder: temperature 80℃×3.0h.

[0047] 4. Deposition substrate: 12CrNi2 alloy structural steel.

[0048] 5. Laser deposition vacuum glove box environment: H 2 O, O 2 ≤50PPM.

[0049] 6. Process parameters of laser deposition: continuous laser ir...

Embodiment 3

[0053] In this embodiment, the specific steps of the laser deposition hole elimination method for alloy structural steel are as follows:

[0054] 1. Alloy structural steel powder particle size is 100-250 mesh, sphericity ≥ 93%, oxygen content ≥ 500PPM; Ni, Cr, Nb powder particle size is 100-250 mesh, sphericity ≥ 94%, chemical composition purity 99.99 More than wt%, oxygen content ≤ 500PPM. Among them, the alloy grade of the alloy structural steel powder is 12CrNi2.

[0055] 2. Three kinds of pure Ni, Cr and Nb powders are mixed into the alloy steel powder at a ratio of 1wt%, and the ratio of Cr powder to the whole mixed alloy steel powder is 3% in terms of weight percentage.

[0056] 3. Drying treatment of mixed powder: temperature 120℃×2.0h.

[0057] 4. Deposition substrate: 12CrNi2 alloy structural steel.

[0058] 5. Laser deposition vacuum glove box environment: H 2 O, O 2 ≤50PPM.

[0059] 6. Process parameters of laser deposition: continuous laser irradiation, laser...

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Abstract

The invention belongs to the field of metal laser additive manufacturing, and relates to a method for eliminating laser deposition holes in low-carbon alloy structural steel, which is suitable for eliminating defects of laser deposition holes in alloy steel components with various complex structures. Use one or more powders of Ni, Cr, Nb with the same particle size as the alloy steel powder, uniformly mix a certain proportion in the alloy steel powder through a ball mill, and perform laser deposition in a vacuum glove box by synchronous powder feeding method. During the deposition process Protecting the laser deposition area with a certain flow rate of argon gas can realize laser additive manufacturing without holes in the internal structure of structural steel. The invention provides a new process method for the elimination of holes in laser deposition of structural steel powder, so that the structural steel powder has a dense and uniform deposition structure with a small change in chemical composition, and the hole defects are completely eliminated, and the mechanical properties of the deposited layer are significantly improved. Additive manufacturing of steel structural parts provides a solution to optimize the deposition structure and mechanical properties.

Description

technical field [0001] The invention belongs to the field of metal laser additive manufacturing, and relates to a method for eliminating laser deposition holes in low-carbon alloy structural steel, which is suitable for eliminating defects of laser deposition holes in alloy steel components with various complex structures. Background technique [0002] As a metal material widely used in modern industry, low-carbon alloy structural steel has good hardenability. After appropriate heat treatment, it is easy to achieve good mechanical properties. It is widely used in the manufacture of machines with large interface size and complex structure. Component. For example: large-scale high-performance structural parts in key engineering fields such as nuclear power emergency diesel engine camshafts and high-speed train brake discs. The application potential of alloy structural steel parts in various fields mainly depends on the dense and uniform internal structure of large-scale compo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10B22F3/105
CPCC23C24/103B33Y10/00B22F10/00B22F10/36B22F10/38B22F10/322B22F10/25B22F10/366B22F12/41B22F10/34Y02P10/25
Inventor 迟长泰谢玉江彭晓董志宏亢红伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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