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<p>The paper presents an innovative assessment of the microstructure and tribological behavior of NiCrBSiCW. The hard compounds in the sample, including carbides (M<sub>6</sub>C, M<sub>7</sub>C<sub>3</sub>, and M<sub>23</sub>C<sub>6</sub>), silicides (Ni<sub>3</sub>Si and Ni<sub>5</sub>Si<sub>2</sub>), and borides (Ni<sub>3</sub>B and M<sub>5</sub>B<sub>3</sub>), were formed either in primary form or two-phase eutectic form. The solidification microstructure, the nature of the phases formed, and the tribological parameters linked to their behavior were evaluated. A novel wear testing approach was introduced; a test device where a flat sample was used as a pin against a rotating disk (attached to a lathe). The results of the chemical analysis, structural micro-study, and wear behavior of these alloys, coupled with the innovative approach to testing, pave the way for a deeper understanding of these properties. The current study advances the idea that these properties are not only related to the gradual and systematic increase in the elements of addition for purpose hardening (Cr, Si, and B) with Ni, which support the formation of hard compounds, CrB, Cr<sub>5</sub>B<sub>3</sub> Ni<sub>3</sub>B, Ni<sub>5</sub>Si<sub>2</sub>, and Ni<sub>3</sub>Si in a Ni-γ matrix and which vary according to the nominal chemical composition. An important part of wear resistance lies in the nature, the face, and the distribution and localization of the hard compounds in a more ductile matrix. These results, shared with the better data of the metallurgical structure, constitute elements of reasoning for the best possible optimization in the case of NiCrBSiCW intended to resist wear.</p>

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A Qualitative Correlation Between Microstructure and Tribological Responses of Ni-Based Alloys Under Complex Working Conditions

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Mohammed Seyf Eddine Bougoffa,
  • Mamoun Fellah,
  • Mohamed Nabil Bachirbey,
  • Sayhia Benchaa,
  • Chahrazed Benouali,
  • Hind Saidani Scott,
  • Ahlem Guesmi,
  • Lotfi Khezami

摘要

The paper presents an innovative assessment of the microstructure and tribological behavior of NiCrBSiCW. The hard compounds in the sample, including carbides (M6C, M7C3, and M23C6), silicides (Ni3Si and Ni5Si2), and borides (Ni3B and M5B3), were formed either in primary form or two-phase eutectic form. The solidification microstructure, the nature of the phases formed, and the tribological parameters linked to their behavior were evaluated. A novel wear testing approach was introduced; a test device where a flat sample was used as a pin against a rotating disk (attached to a lathe). The results of the chemical analysis, structural micro-study, and wear behavior of these alloys, coupled with the innovative approach to testing, pave the way for a deeper understanding of these properties. The current study advances the idea that these properties are not only related to the gradual and systematic increase in the elements of addition for purpose hardening (Cr, Si, and B) with Ni, which support the formation of hard compounds, CrB, Cr5B3 Ni3B, Ni5Si2, and Ni3Si in a Ni-γ matrix and which vary according to the nominal chemical composition. An important part of wear resistance lies in the nature, the face, and the distribution and localization of the hard compounds in a more ductile matrix. These results, shared with the better data of the metallurgical structure, constitute elements of reasoning for the best possible optimization in the case of NiCrBSiCW intended to resist wear.