Tribological properties of solid solution strengthened laser cladded NiCrBSi/WC-12Co metal matrix composite coatings

Bergant, Zoran (author), Šetina Batič, Barbara (author), Felde, Imre (author), Šturm, Roman (author), Sedlaček, Marko (author)

NiCrBSi, WC-12Co and NiCrBSi with 30, 40 and 50 wt.% WC-12Co coatings were produced on low carbon steel by laser cladding with an Nd:YAG laser with a multi-jet coaxial cladding-nozzle. The microstructure properties after WC-12Co alloying were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and Vickers hardness tests. The resulting microstructures consisted of a γ-Ni and Ni$_3$B matrix, strengthened with Co and W, Ni$_3$Si, CrB, Cr$_7$C$_3$, Cr$_{23}$C$_6$ , WC/W$_2$C phases. In coatings with 30, 40 and 50 wt.% WC-12Co, a solid solution, strengthened multi-matrix NiCrWCo phase formed, which yielded a higher matrix hardness. Wear tests that monitored the friction coefficients were performed with a tribometer that contained a ball-on-disc configuration, Al$_2$O$_3$ counter-body and reciprocal sliding mode at room temperature. The major wear mode on the NiCrBSi coatings without the WC-12Co was adhesive with a high wear rate and visible material loss by flaking, delamination and micro-ploughing. The addition of WC-12Co to the NiCrBSi coating significantly increased the wear resistance and changed the major wear mechanism from adhesion to three-body abrasion and fatigue wear.

• Language: English
• Keywords: wear, solid-solution strengthening, laser cladding, NiCrBSi, WC-Co, coating
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2022
• Number of pages: 20 str.
• Numbering: Vol. 15, iss. 1, art. 342
• PID: 20.500.12556/RUL-134322
• UDC: 620.1:539.92
• ISSN on article: 1996-1944
• DOI: 10.3390/ma15010342
• COBISS.SI-ID: 92175107
• Publication date in RUL: 06.01.2022

Record is a part of a journal

• Title: Materials
• Shortened title: Materials
• Publisher: MDPI
• ISSN: 1996-1944
• COBISS.SI-ID: 33588485

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 04.01.2022

Secondary language

• Language: Slovenian
• Keywords: obraba, utrjevanje, lasersko oblaganje, prevleke