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<p>To improve the heat-treatment tolerance of NM500 wear-resistant steel, two experimental steels containing 0.05 wt.% V (V1) and 0.10 wt.% V (V2) were quenched at 780, 790, 800, and 820&#xa0;°C and tempered at 220&#xa0;°C. The martensitic microstructure, hardness, and dry sliding wear behavior were compared. The martensite lath width of V1 varied markedly from 0.239 to 0.374&#xa0;μm, whereas that of V2 remained within 0.331-0.350&#xa0;μm, indicating lower sensitivity to quenching-temperature fluctuation. EBSD characterization at selected temperatures showed temperature-dependent differences in grain-boundary and KAM features. At 790&#xa0;°C, V2 exhibited a higher high-angle grain boundary fraction and a more homogeneous KAM distribution than V1; at 780&#xa0;°C, both steels had similar high-angle grain boundary fractions, while V2 showed a higher average KAM value and more subdivided orientation domains. V2 showed lower volumetric wear loss at all quenching temperatures and shallower, smoother wear scars. These results suggest that increasing V content from 0.05 to 0.10 wt.% is associated with improved martensitic substructure stability and a more stable wear response under the investigated heat-treatment conditions.</p>

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Effect of Vanadium Microalloying on the Microstructural Stability, Hardness, and Wear Behavior of NM500 Wear-Resistant Steel under Different Quenching Temperatures

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • Zijie Zeng,
  • Sheng Huang,
  • Zhiying Li,
  • Hui Yang,
  • Changrong Li

摘要

To improve the heat-treatment tolerance of NM500 wear-resistant steel, two experimental steels containing 0.05 wt.% V (V1) and 0.10 wt.% V (V2) were quenched at 780, 790, 800, and 820 °C and tempered at 220 °C. The martensitic microstructure, hardness, and dry sliding wear behavior were compared. The martensite lath width of V1 varied markedly from 0.239 to 0.374 μm, whereas that of V2 remained within 0.331-0.350 μm, indicating lower sensitivity to quenching-temperature fluctuation. EBSD characterization at selected temperatures showed temperature-dependent differences in grain-boundary and KAM features. At 790 °C, V2 exhibited a higher high-angle grain boundary fraction and a more homogeneous KAM distribution than V1; at 780 °C, both steels had similar high-angle grain boundary fractions, while V2 showed a higher average KAM value and more subdivided orientation domains. V2 showed lower volumetric wear loss at all quenching temperatures and shallower, smoother wear scars. These results suggest that increasing V content from 0.05 to 0.10 wt.% is associated with improved martensitic substructure stability and a more stable wear response under the investigated heat-treatment conditions.