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<p>High-Mn austenitic cast steel exhibits excellent work hardening and high toughness, making it well-suited for impact wear-resistant applications. However, significant wear can occur in the early stages of service before sufficient work hardening develops near the surface. To mitigate this initial wear, this study investigates the microstructural characteristics of the hardened layer induced by shot peening and its effect on wear behavior. The results reveal that the near-surface microstructure exhibits a high dislocation density, abundant twins, and a nanocrystalline region formed through twin-dislocation interactions, leading to substantial work hardening. Abrasive wear testing indicates that greater maximum hardness in the hardened layer corresponds to lower wear loss. These findings demonstrate that shot peening effectively enhances the wear resistance of high-Mn cast steel by promoting the formation of a hardened surface layer.</p>

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Microstructure and Wear Behavior of High-Mn Austenitic Cast Steel Hardened by Air Blast Shot-Peening

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Huynh Kinh Luan Ngo,
  • Tetsuya Okuyama,
  • Kaoru Yamamoto,
  • Masaru Nakayama,
  • Masaki Kudo,
  • Kuniaki Mizuno,
  • Yutaka Yagi

摘要

High-Mn austenitic cast steel exhibits excellent work hardening and high toughness, making it well-suited for impact wear-resistant applications. However, significant wear can occur in the early stages of service before sufficient work hardening develops near the surface. To mitigate this initial wear, this study investigates the microstructural characteristics of the hardened layer induced by shot peening and its effect on wear behavior. The results reveal that the near-surface microstructure exhibits a high dislocation density, abundant twins, and a nanocrystalline region formed through twin-dislocation interactions, leading to substantial work hardening. Abrasive wear testing indicates that greater maximum hardness in the hardened layer corresponds to lower wear loss. These findings demonstrate that shot peening effectively enhances the wear resistance of high-Mn cast steel by promoting the formation of a hardened surface layer.