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<p>The wear mechanism and microstructural characteristics of new hot-work die steel (NHWDS) were investigated at elevated temperatures under dry air conditions. The findings indicated that between 400 and 700&#xa0;°C, mild tribo-oxidation wear is the primary wear mechanism for NHWDS under the experimental conditions. The high wear resistance of NHWDS at elevated temperatures is attributed to its high oxidation resistance and excellent thermal stability. The superior oxidation performance facilitates the formation and evolution of a protective tribo-oxide layer, whereas the good thermal stability helps in minimizing the wear of this oxide layer at high temperatures. These two factors contribute to expanding the temperature range of mild oxidation wear. Additionally, the carbides in NHWDS enhance wear resistance by forming carbide layers at elevated temperatures, which support the tribo-oxide layer and prevent its excessive growth into the matrix, thereby extending the temperature range of mild tribo-oxidation wear.</p>

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Transition of Wear Mechanisms on the Elevated-Temperature Wear of a New Hot-Work Die Steel

  • 期刊论文

  • 发表日期：

    2025年9月23日

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  • Zhen Wang,
  • Shuang Li,
  • WeiYong Li,
  • Junzhe Wang,
  • Jingqi Hu,
  • Ziqi Lu

摘要

The wear mechanism and microstructural characteristics of new hot-work die steel (NHWDS) were investigated at elevated temperatures under dry air conditions. The findings indicated that between 400 and 700 °C, mild tribo-oxidation wear is the primary wear mechanism for NHWDS under the experimental conditions. The high wear resistance of NHWDS at elevated temperatures is attributed to its high oxidation resistance and excellent thermal stability. The superior oxidation performance facilitates the formation and evolution of a protective tribo-oxide layer, whereas the good thermal stability helps in minimizing the wear of this oxide layer at high temperatures. These two factors contribute to expanding the temperature range of mild oxidation wear. Additionally, the carbides in NHWDS enhance wear resistance by forming carbide layers at elevated temperatures, which support the tribo-oxide layer and prevent its excessive growth into the matrix, thereby extending the temperature range of mild tribo-oxidation wear.