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Improving the toughness of thermally sprayed Cr 3C 2-NiCr hardmetal coatings by laser post-treatment

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Improving the toughness of thermally sprayed Cr 3C 2-NiCr hardmetal coatings by laser post-treatment. / Janka, Leo; Norpoth, Jonas; Eicher, Stefan; Rodríguez Ripoll, Manel; Vuoristo, Petri.

julkaisussa: Materials and Design, Vuosikerta 98, 15.05.2016, s. 135-142.

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Harvard

Janka, L, Norpoth, J, Eicher, S, Rodríguez Ripoll, M & Vuoristo, P 2016, 'Improving the toughness of thermally sprayed Cr 3C 2-NiCr hardmetal coatings by laser post-treatment', Materials and Design, Vuosikerta. 98, Sivut 135-142. https://doi.org/10.1016/j.matdes.2016.03.007

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Author

Janka, Leo ; Norpoth, Jonas ; Eicher, Stefan ; Rodríguez Ripoll, Manel ; Vuoristo, Petri. / Improving the toughness of thermally sprayed Cr 3C 2-NiCr hardmetal coatings by laser post-treatment. Julkaisussa: Materials and Design. 2016 ; Vuosikerta 98. Sivut 135-142.

Bibtex - Lataa

@article{fcf81fe9898e4037b8737f5edf007531,
title = "Improving the toughness of thermally sprayed Cr 3C 2-NiCr hardmetal coatings by laser post-treatment",
abstract = "Thermally sprayed hardmetal coatings typically exhibit a pronounced embrittlement of the metallic binder matrix due to carbide dissolution during the deposition process. This characteristic renders the coatings prone to wear by brittle fracture, which lays at the core of many relevant wear phenomena. The present work introduces laser post-treatments as a suitable means of {"}curing{"} the microstructure of high-velocity oxygen-fuel sprayed Cr 3C 2-NiCr coatings from this spray-process induced deterioration. While operating well below the remelting threshold, the essential impact of the laser-generated heat flux is precipitation of secondary chromium-carbides from the supersaturated binder matrix. The concomitant transition from a solid-solution to a precipitation-hardened phase significantly increases the fracture toughness of the binder matrix and renders the coatings more resistant against mechanical wear. In the present work, the microstructural modifications of the coatings upon laser post-treatments were investigated by means of scanning electron microscopy and microhardness probing, and the corresponding impact on the abrasive wear resistance was tested under both high- and low-stress conditions. Major improvements of the high-stress abrasive wear resistance by up to a factor of three were determined and discussed in the context of the microstructure of the wear scars.",
keywords = "Abrasive wear, Cr C -NiCr, HVOF, Laser post-treatment",
author = "Leo Janka and Jonas Norpoth and Stefan Eicher and {Rodr{\'i}guez Ripoll}, Manel and Petri Vuoristo",
year = "2016",
month = "5",
day = "15",
doi = "10.1016/j.matdes.2016.03.007",
language = "English",
volume = "98",
pages = "135--142",
journal = "Materials and Design",
issn = "0264-1275",
publisher = "Elsevier",

}

RIS (suitable for import to EndNote) - Lataa

TY - JOUR

T1 - Improving the toughness of thermally sprayed Cr 3C 2-NiCr hardmetal coatings by laser post-treatment

AU - Janka, Leo

AU - Norpoth, Jonas

AU - Eicher, Stefan

AU - Rodríguez Ripoll, Manel

AU - Vuoristo, Petri

PY - 2016/5/15

Y1 - 2016/5/15

N2 - Thermally sprayed hardmetal coatings typically exhibit a pronounced embrittlement of the metallic binder matrix due to carbide dissolution during the deposition process. This characteristic renders the coatings prone to wear by brittle fracture, which lays at the core of many relevant wear phenomena. The present work introduces laser post-treatments as a suitable means of "curing" the microstructure of high-velocity oxygen-fuel sprayed Cr 3C 2-NiCr coatings from this spray-process induced deterioration. While operating well below the remelting threshold, the essential impact of the laser-generated heat flux is precipitation of secondary chromium-carbides from the supersaturated binder matrix. The concomitant transition from a solid-solution to a precipitation-hardened phase significantly increases the fracture toughness of the binder matrix and renders the coatings more resistant against mechanical wear. In the present work, the microstructural modifications of the coatings upon laser post-treatments were investigated by means of scanning electron microscopy and microhardness probing, and the corresponding impact on the abrasive wear resistance was tested under both high- and low-stress conditions. Major improvements of the high-stress abrasive wear resistance by up to a factor of three were determined and discussed in the context of the microstructure of the wear scars.

AB - Thermally sprayed hardmetal coatings typically exhibit a pronounced embrittlement of the metallic binder matrix due to carbide dissolution during the deposition process. This characteristic renders the coatings prone to wear by brittle fracture, which lays at the core of many relevant wear phenomena. The present work introduces laser post-treatments as a suitable means of "curing" the microstructure of high-velocity oxygen-fuel sprayed Cr 3C 2-NiCr coatings from this spray-process induced deterioration. While operating well below the remelting threshold, the essential impact of the laser-generated heat flux is precipitation of secondary chromium-carbides from the supersaturated binder matrix. The concomitant transition from a solid-solution to a precipitation-hardened phase significantly increases the fracture toughness of the binder matrix and renders the coatings more resistant against mechanical wear. In the present work, the microstructural modifications of the coatings upon laser post-treatments were investigated by means of scanning electron microscopy and microhardness probing, and the corresponding impact on the abrasive wear resistance was tested under both high- and low-stress conditions. Major improvements of the high-stress abrasive wear resistance by up to a factor of three were determined and discussed in the context of the microstructure of the wear scars.

KW - Abrasive wear

KW - Cr C -NiCr

KW - HVOF

KW - Laser post-treatment

U2 - 10.1016/j.matdes.2016.03.007

DO - 10.1016/j.matdes.2016.03.007

M3 - Article

VL - 98

SP - 135

EP - 142

JO - Materials and Design

JF - Materials and Design

SN - 0264-1275

ER -