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<p>To prolong the service life of the tunnel boring machine cutter ring under extremely hard rock geological conditions, a new type of high hardness and high toughness cutter ring material DQ3 steel was developed by improving chemical composition and optimizing the heat treatment process. To evaluate the comprehensive performance of DQ3 steel, a comparative analysis was conducted with conventional cutter ring material DC53 steel based on indicators such as microstructure, hardness, impact toughness, wear resistance, and rock-breaking performance. The results indicate that quenching DQ3 steel at 1050°C and tempering at 540°C bring about a 2.1 HRC increase in hardness and a 225.7% increase in impact toughness. Under the condition of low-stress wear, the abundant primary carbides in the microstructure of DC53 steel result in lower wear mass loss compared to the DQ3 steel. At high-stress wear, the wear resistance of DQ3 steel is superior to that of DC53 steel, which is mainly due to the good hard-tough matching of DQ3 steel. In the excavation of extremely hard rock strata, the rock-breaking performance of the DQ3 cutter ring is 19.37% higher than that of the DC53 cutter ring, and the service life is significantly improved.</p>

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Microstructure, Mechanical Properties, and Wear Behavior of an Improved Rock-Breaking Cutter Ring Steel Used on Tunnel Boring Machine

  • 期刊论文

  • 发表日期：

    2025年5月2日

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  • Mengze Han,
  • Jingbo Guo,
  • Jingkai Li,
  • Jie Li,
  • Yuhang Sun,
  • Jinbo Liu,
  • Zhifeng Ren

摘要

To prolong the service life of the tunnel boring machine cutter ring under extremely hard rock geological conditions, a new type of high hardness and high toughness cutter ring material DQ3 steel was developed by improving chemical composition and optimizing the heat treatment process. To evaluate the comprehensive performance of DQ3 steel, a comparative analysis was conducted with conventional cutter ring material DC53 steel based on indicators such as microstructure, hardness, impact toughness, wear resistance, and rock-breaking performance. The results indicate that quenching DQ3 steel at 1050°C and tempering at 540°C bring about a 2.1 HRC increase in hardness and a 225.7% increase in impact toughness. Under the condition of low-stress wear, the abundant primary carbides in the microstructure of DC53 steel result in lower wear mass loss compared to the DQ3 steel. At high-stress wear, the wear resistance of DQ3 steel is superior to that of DC53 steel, which is mainly due to the good hard-tough matching of DQ3 steel. In the excavation of extremely hard rock strata, the rock-breaking performance of the DQ3 cutter ring is 19.37% higher than that of the DC53 cutter ring, and the service life is significantly improved.