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<p>The microstructure and properties in the near-surface region of two high-carbon metastable austenitic steels after two-body abrasive wear were studied. The samples were subjected to wear loads in a range of 8–32&#xa0;N (corresponding to approximately 0.1–0.4&#xa0;MPa). Vickers hardness measurements on the worn surface as well as nanoindentation measurements on the cross section present a significant hardness increase from the bulk toward the surface of up to 400%. Electron channeling contrast imaging was utilized to assign the indents from the nanoindentation measurements to the martensitic or austenitic phase. Within a subsurface layer with a thickness of a few microns, it was impossible to distinguish a phase via these images. Magnetic force microscopy revealed a few microns thick martensitic layer, which is the main cause of the significant hardness increase in the near-surface region. No considerable influence of the wear load (within the tested load range) on the resulting microstructure and mechanical properties was found. Transmission electron microscopy images reveal a grain size of several nanometers within the martensitic subsurface layer, which accounts for the observed ductility on the worn surfaces, despite the inherent brittleness typically associated with high-carbon martensite.</p>

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Near-Surface Microstructure and Properties of High-Carbon Metastable Austenitic Steels Subjected to Abrasive Wear

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月28日

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  • Jerome Ingber,
  • Johannes Maier,
  • Stephanie Lippmann,
  • Katharina Freiberg,
  • Tomáš Studecky,
  • Maik Kunert

摘要

The microstructure and properties in the near-surface region of two high-carbon metastable austenitic steels after two-body abrasive wear were studied. The samples were subjected to wear loads in a range of 8–32 N (corresponding to approximately 0.1–0.4 MPa). Vickers hardness measurements on the worn surface as well as nanoindentation measurements on the cross section present a significant hardness increase from the bulk toward the surface of up to 400%. Electron channeling contrast imaging was utilized to assign the indents from the nanoindentation measurements to the martensitic or austenitic phase. Within a subsurface layer with a thickness of a few microns, it was impossible to distinguish a phase via these images. Magnetic force microscopy revealed a few microns thick martensitic layer, which is the main cause of the significant hardness increase in the near-surface region. No considerable influence of the wear load (within the tested load range) on the resulting microstructure and mechanical properties was found. Transmission electron microscopy images reveal a grain size of several nanometers within the martensitic subsurface layer, which accounts for the observed ductility on the worn surfaces, despite the inherent brittleness typically associated with high-carbon martensite.