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<p>NiCrBSi alloys are widely used as wear-resistant deposits. However, despite several studies, there are still some remaining questions concerning their microstructure and the transformation sequence during solidification. This study investigates a gas-atomized powder's non-equilibrium microstructure and a cast sample's near-equilibrium microstructure by synchrotron XRD coupled with SEM observations. NiCrBSi alloys consist of a nickel-rich matrix with CrB, Cr<sub>7</sub>C<sub>3</sub>, Ni<sub>3</sub>B, Ni<sub>31</sub>Si<sub>12</sub> crystals and <i>γ</i>′ Ni<sub>3</sub>Si β1 precipitates. The transformation sequence is studied by <i>in situ</i> XRD analyses using a synchrotron source. Melting and solidification of Ni<sub>31</sub>Si<sub>12</sub> and Ni<sub>3</sub>B and solid-state transformations of Ni<sub>31</sub>Si<sub>12</sub> and Ni<sub>3</sub>Si <i>β</i>1 are depicted. Finally, the nickel-rich <i>γ</i> (Ni) matrix, CrB and Cr<sub>7</sub>C<sub>3,</sub> are likely to remain solid at high temperatures up to 1200&#xa0;°C.</p>

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Near-Equilibrium Transformation Sequence of NiCrBSi Self-Fluxing Nickel Alloy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月10日

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  • Anthony Ty,
  • Yannick Balcaen,
  • Morgane Mokhtari,
  • Andrew Fitch,
  • Olivier Dalverny,
  • Joël Alexis

摘要

NiCrBSi alloys are widely used as wear-resistant deposits. However, despite several studies, there are still some remaining questions concerning their microstructure and the transformation sequence during solidification. This study investigates a gas-atomized powder's non-equilibrium microstructure and a cast sample's near-equilibrium microstructure by synchrotron XRD coupled with SEM observations. NiCrBSi alloys consist of a nickel-rich matrix with CrB, Cr7C3, Ni3B, Ni31Si12 crystals and γ′ Ni3Si β1 precipitates. The transformation sequence is studied by in situ XRD analyses using a synchrotron source. Melting and solidification of Ni31Si12 and Ni3B and solid-state transformations of Ni31Si12 and Ni3Si β1 are depicted. Finally, the nickel-rich γ (Ni) matrix, CrB and Cr7C3, are likely to remain solid at high temperatures up to 1200 °C.