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Article

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Title

Influence of laser beam power on the temperature distribution and dimensions of the molten pool formed during laser boriding of Nimonic 80A-alloy

Authors

[ 1 ] Instytut Inżynierii Materiałowej, Wydział Inżynierii Materiałowej i Fizyki Technicznej, Politechnika Poznańska | [ P ] employee

Scientific discipline (Law 2.0)

[2.8] Materials engineering

Year of publication

2023

Published in

Crystals

Journal year: 2023 | Journal volume: vol. 13 | Journal number: iss. 3

Article type

scientific article

Publication language

english

Keywords
EN
  • laser boriding
  • laser alloying
  • temperature distribution
  • borides
  • hardness
Abstract

EN Laser boriding is a surface treatment that involves the simultaneous re-melting and mixing of the alloying material, containing amorphous boron blended with diluted polyvinyl alcohol, with the substrate material (Nimonic 80A-alloy). As a result of high cooling rates, the boride layer is formed from a solidifying molten pool. The thickness of the produced layer depends on the laser treatment parameters, e.g., power of the laser beam, scanning rate, and laser beam radius. These parameters influence the temperature distribution on the cross-section of laser tracks and, thus, directly determine the size of the molten pool, from which the boride layer is formed after crystallization. In the present study, laser borided layers were produced on Nimonic 80A alloy using a CO2 molecular laser. Differences in the laser beam power used resulted in the formation of layers of different thicknesses, which resulted directly from the differences in the temperature distribution in the treated material. The amount of boron in the molten pool directly influenced the obtained hardness of the laser borided layer. It was found that the lower laser beam power had an advantageous effect on the hardness due to the higher percentage of nickel borides and chromium borides in the layer. The reasons for this situation are discussed in detail.

Date of online publication

15.03.2023

Pages (from - to)

507-1 - 507-18

DOI

10.3390/cryst13030507

URL

https://www.mdpi.com/2073-4352/13/3/507

Comments

Article number: 507

License type

CC BY (attribution alone)

Open Access Mode

open journal

Open Access Text Version

final published version

Date of Open Access to the publication

at the time of publication

Ministry points / journal

70

Impact Factor

2,7 [List 2022]

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