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<p>This study investigates the influence of Ni additions and the precipitation of the B2-(Fe,Ni)Al intermetallic phase on the sliding wear behavior of Fe17Mn7.5Al0.8CxNi steels (x = 1.5, 3, and 6 wt.%). Alloys were produced by vacuum induction melting, hot rolled, and subjected to annealing at 900 and 1100&#xa0;°C to promote distinct precipitation states. Sliding wear tests were performed using a block-on-ring configuration under a load of 52.6&#xa0;N at sliding speeds of 0.4 and 0.8 m/s. Microstructural characterization was carried out by optical microscopy, scanning electron microscopy (SEM), microhardness profiling, and electron backscatter diffraction (EBSD) to elucidate wear mechanisms and subsurface deformation phenomena. Results indicate that while Ni additions at 900&#xa0;°C promote precipitation hardening through the formation of B2-(Fe,Ni)Al, this phase does not improve sliding wear resistance under the tested conditions. Steels containing B2-(Fe,Ni) Al precipitates exhibited reduced surface strain-hardening capability compared to fully austenitic counterparts annealed at 1100&#xa0;°C. EBSD analysis revealed that wear-induced severe plastic deformation produced ultrafine grains via dynamic recrystallization (DRX) within the subsurface layer, contributing to strain hardening through the dynamic Hall–Petch effect. The predominant wear mechanism was adhesive delamination, with oxidative wear observed only at longer test durations and lower sliding speeds. This work provides new insight into the role of Ni additions in the tribological performance of Fe-Mn-Al-C-Ni steels, demonstrating that wear resistance is governed by a synergistic interplay between bulk mechanical properties, strain-hardening mechanisms (such as TRIP, TWIP, or MBIP), and DRX phenomena, rather than by the initial hardness of the material.</p>

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The Effect of Ni Additions on the Sliding Wear of Fe-Mn-Al-C Steels

  • 期刊论文

  • 发表日期：

    2026年6月27日

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  • J. S. Rodríguez,
  • H. Valdes-Vera,
  • O. A. Zambrano,
  • A. Bedolla-Jacuinde

摘要

This study investigates the influence of Ni additions and the precipitation of the B2-(Fe,Ni)Al intermetallic phase on the sliding wear behavior of Fe17Mn7.5Al0.8CxNi steels (x = 1.5, 3, and 6 wt.%). Alloys were produced by vacuum induction melting, hot rolled, and subjected to annealing at 900 and 1100 °C to promote distinct precipitation states. Sliding wear tests were performed using a block-on-ring configuration under a load of 52.6 N at sliding speeds of 0.4 and 0.8 m/s. Microstructural characterization was carried out by optical microscopy, scanning electron microscopy (SEM), microhardness profiling, and electron backscatter diffraction (EBSD) to elucidate wear mechanisms and subsurface deformation phenomena. Results indicate that while Ni additions at 900 °C promote precipitation hardening through the formation of B2-(Fe,Ni)Al, this phase does not improve sliding wear resistance under the tested conditions. Steels containing B2-(Fe,Ni) Al precipitates exhibited reduced surface strain-hardening capability compared to fully austenitic counterparts annealed at 1100 °C. EBSD analysis revealed that wear-induced severe plastic deformation produced ultrafine grains via dynamic recrystallization (DRX) within the subsurface layer, contributing to strain hardening through the dynamic Hall–Petch effect. The predominant wear mechanism was adhesive delamination, with oxidative wear observed only at longer test durations and lower sliding speeds. This work provides new insight into the role of Ni additions in the tribological performance of Fe-Mn-Al-C-Ni steels, demonstrating that wear resistance is governed by a synergistic interplay between bulk mechanical properties, strain-hardening mechanisms (such as TRIP, TWIP, or MBIP), and DRX phenomena, rather than by the initial hardness of the material.