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<p>The dry-sliding wear behavior of the two-phase, f.c.c. + B2 (ordered b.c.c.), lamellar structured high entropy alloy Fe<sub>28.2</sub>Ni<sub>18.8</sub>Mn<sub>32.9</sub>Al<sub>14.1</sub>Cr<sub>6</sub> that has undergone a nitriding treatment was determined. The nitrided layer was formed by annealing samples in pure nitrogen at 1000&#xa0;°C for 100&#xa0;h. Tests were run at both high (1.0&#xa0;m/s) and low (0.1&#xa0;m/s) speeds at room temperature. Scanning electron microscopy, energy dispersive x-ray microanalysis, and optical profilometry were used to characterize the worn pin surface as well as its wear tracks. Wear rates under the high sliding speed were up to 15 times lower than those at the low sliding speed. The nitrided pins had better wear resistance than their as-cast counterparts under low sliding speed, but slightly worse wear at high sliding speed. This was a result of the thickness, continuity, and chemistry of the mechanically mixed layer formed on each wear pin surface as well as the changes in hardness as a result of grain refinement from dynamic recrystallization. The wear rates of pins decreased significantly when wear debris particles were removed during brush tests, except for the as-cast low-speed condition, pointing to its role as an abrasive third body. Redeposited wear debris from the as-cast low-speed condition may have not only provided some level of protection but also contributed to mass gain and subsequently a lower measured wear rate. Oxidative and abrasive wear played a key role under all conditions while delamination served as an important mechanism at high sliding speeds. Adhesive wear was more dominant under low sliding speed conditions.</p>

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Comparison of The Dry-Sliding Wear Behavior of A Nitrided and As-Cast Two-Phase Fe28.2Ni18.8Mn32.9Al14.1Cr6

  • 期刊论文

  • 发表日期：

    2025年8月22日

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  • Aubrey Tang,
  • Nicolaus Dahl,
  • Francis E. Kennedy,
  • Ian Baker

摘要

The dry-sliding wear behavior of the two-phase, f.c.c. + B2 (ordered b.c.c.), lamellar structured high entropy alloy Fe28.2Ni18.8Mn32.9Al14.1Cr6 that has undergone a nitriding treatment was determined. The nitrided layer was formed by annealing samples in pure nitrogen at 1000 °C for 100 h. Tests were run at both high (1.0 m/s) and low (0.1 m/s) speeds at room temperature. Scanning electron microscopy, energy dispersive x-ray microanalysis, and optical profilometry were used to characterize the worn pin surface as well as its wear tracks. Wear rates under the high sliding speed were up to 15 times lower than those at the low sliding speed. The nitrided pins had better wear resistance than their as-cast counterparts under low sliding speed, but slightly worse wear at high sliding speed. This was a result of the thickness, continuity, and chemistry of the mechanically mixed layer formed on each wear pin surface as well as the changes in hardness as a result of grain refinement from dynamic recrystallization. The wear rates of pins decreased significantly when wear debris particles were removed during brush tests, except for the as-cast low-speed condition, pointing to its role as an abrasive third body. Redeposited wear debris from the as-cast low-speed condition may have not only provided some level of protection but also contributed to mass gain and subsequently a lower measured wear rate. Oxidative and abrasive wear played a key role under all conditions while delamination served as an important mechanism at high sliding speeds. Adhesive wear was more dominant under low sliding speed conditions.