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A process method for laser additive manufacturing of crniv series low alloy steel

A low-alloy steel, laser additive technology, applied in the field of laser 3D printing, can solve the problems of complex production process, high processing cost and long cycle of nuclear power emergency diesel engine camshaft, and achieve high material utilization rate, improve mechanical properties, process flow and so on. short effect

Active Publication Date: 2019-11-29
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of using the forging method to manufacture the camshafts of nuclear power emergency diesel engines, the production process is complex, the cycle is long, and the processing cost is high. The present invention provides a process for manufacturing CrNiV series low alloy steels by laser additive manufacturing

Method used

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  • A process method for laser additive manufacturing of crniv series low alloy steel
  • A process method for laser additive manufacturing of crniv series low alloy steel
  • A process method for laser additive manufacturing of crniv series low alloy steel

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Experimental program
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Effect test

Embodiment 1

[0039] The basic composition weight percent (wt%) of low alloy steel powder is C: 0.05, Cr: 1.40, Ni: 1.80, B: 0.50, Si: 1.00, Mo: 0.50, Mn: 0.10, V: 0.50, and the rest is Fe . The particle size of the powder is 53-140 microns.

[0040] The manufacturing method steps of laser additive manufacturing CrNiV alloy steel are as follows:

[0041]1) the low-alloy steel raw material listed in embodiment 1 is processed through vacuum smelting, gas atomization and sieving procedures to obtain spherical powder; its happy ball rate≤2%, oxygen content≤250ppm; the spherical powder obtained can Reuse more than 3 times, fluidity ≤ 16s / 50g; bulk density ≥ 4.35g / cm 3 .

[0042] 2) Dry the powder obtained in step 1 in an oven at 80°C for more than 3 hours.

[0043] 3) The surface of the low-alloy steel substrate is polished with 60#-500# sandpaper, cleaned and dried for later use, and the powder obtained after drying in step 2 is irradiated with laser beams by means of coaxial powder feeding...

Embodiment 2

[0047] The basic composition weight percentage (wt%) of low alloy steel powder is C: 0.10, Cr: 1.50, Ni: 1.90, B: 0.60, Si: 1.10, Mo: 0.55, Mn: 0.20, V: 0.50, and the rest is Fe . The particle size of the powder is 53-140 microns.

[0048] The manufacturing method steps of laser additive manufacturing low alloy steel are as follows:

[0049] 1) The low-alloy steel raw material listed in embodiment 2 is through vacuum smelting, gas atomization and sieving process, makes spherical powder; Its happy spherical rate≤2%, oxygen content≤250ppm; The spherical powder that makes can repeat Used more than 3 times, fluidity ≤ 16s / 50g; bulk density ≥ 4.35g / cm 3 .

[0050] 2) Dry the powder obtained in step 1 in an oven at 100°C for more than 3 hours.

[0051] 3) The surface of the low-alloy steel substrate is polished with 60#-500# sandpaper, cleaned and dried for later use, and the powder obtained after drying in step 2 is melted and deposited on the surface of the low-alloy steel sub...

Embodiment 3

[0055] The basic composition weight percentage (wt%) of low alloy steel powder is C: 0.18, Cr: 1.60, Ni: 2.00, B: 0.80, Si: 1.20, Mo: 0.55, Mn: 0.40, V: 0.60, and the rest is Fe . The particle size of the powder is 53-140 microns.

[0056] The manufacturing method steps of laser additive manufacturing low alloy steel are as follows:

[0057] 1) the low-alloy steel raw material listed in embodiment 3 is processed through vacuum smelting, gas atomization and sieving procedures, and the spherical powder is obtained; its happy ball rate≤2%, oxygen content≤250ppm; the spherical powder obtained can Reuse more than 3 times, fluidity ≤ 16s / 50g; bulk density ≥ 4.35g / cm 3 .

[0058] 2) Dry the powder obtained in step 1 in an oven at 110°C for more than 3 hours.

[0059] 3) The surface of the low-alloy steel substrate is polished with 60#-500# sandpaper, cleaned and dried for later use, and the powder obtained after drying in step 2 is melted and deposited on the surface of the low-a...

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Abstract

The invention belongs to the technical field of laser 3D printing, and relates to a manufacturing process of CrNiV series low-alloy steel by laser additive manufacturing. The low-alloy steel powder raw material is vacuum smelted, gas atomized and screened to obtain spherical powder. ; The obtained powder is dried in an oven at 80-120°C for more than 3 hours; after being irradiated by a laser, it is melted and deposited on the surface of a low-alloy steel substrate; the energy density of the laser beam is regulated to control the shape and property, and the optical fiber is used under gas protection The laser performs laser irradiation treatment. After scanning one layer continuously, under the condition that the scanning direction is 135° from the scanning direction of the previous layer, the next layer of laser irradiation treatment is carried out. After multi-layer laser irradiation treatment, a defective Laser additive manufacturing of low-alloy steel components with less and excellent mechanical properties; the prepared low-alloy steel components were cooled to room temperature in a controlled atmosphere protection box. The method can prepare an alloy steel component without defects such as cracks and pores and having excellent comprehensive performance.

Description

technical field [0001] The invention belongs to the technical field of laser 3D printing, and in particular relates to a process method for laser additive manufacturing of low alloy steel. Background technique [0002] The emergency diesel generator of nuclear power plant is directly related to nuclear safety as the emergency safety power supply of the whole plant. It plays a very important role in protecting fuel elements from damage and ensuring nuclear safety. The camshaft of a nuclear power emergency diesel generator is its core component, and the quality and performance of the camshaft play a vital role in the safety of the nuclear power plant. At present, camshafts of emergency diesel generators for nuclear power plants are usually produced by forging. The method is to forge 12CrNi2 alloy steel into bars, and then perform mechanical processing to process the bars into a stepped shaft shape, and finally use a special mold for upsetting forging to form, and continue to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B22F9/08B33Y10/00B33Y70/00C22C38/02C22C38/54C22C38/44C22C38/04C22C38/46
CPCC22C38/02C22C38/04C22C38/44C22C38/46C22C38/54B22F9/082B33Y10/00B33Y70/00B22F10/00B22F10/322B22F10/25B22F12/41B22F10/36B22F10/366B22F10/38Y02P10/25
Inventor 张松李卓玄张春华刘舜尧唐旭王强吴臣亮
Owner SHENYANG POLYTECHNIC UNIV
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