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<p>High-speed steel (HSS)/ductile iron (DI) composite rolls with a high-hardness working layer and a high-toughness core are widely used in steel industry. However, significant differences in carbon content and alloying element content between HSS and DI lead to poor bonding and deteriorated performance between outer layer and inner core. Therefore, in this paper, an ultra-high carbon steel (UHCS) middle layer was introduced, a three-step pouring centrifugal casting process was adopted, and optimal process parameters were obtained by finite element simulation to fabricate three-layer HSS composite roll. The addition of UHCS middle layer achieved a continuous variation in microstructure and hardness and a substantial reduction in number of interfacial defects and realized a metallurgical bond between outer layer and inner core, with tonnage per millimeter of wear increased by 20%. Carbide segregation was present in HSS outer layer, where the outer working layer had a high carbon content and the inner bonding layer had a low carbon content. This characteristic not only ensured performance of working layer but also facilitated a sound bond with middle layer.</p>

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Numerical Simulation and Microstructure Characteristics of Centrifugal Cast High-Speed Steel Composite Rolls

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Juncheng Hou,
  • Zhixia Xiao,
  • Baoxi Liu,
  • Jian Ding,
  • Chaoqun Xia,
  • Huarui Zhang,
  • Jiebing Liu

摘要

High-speed steel (HSS)/ductile iron (DI) composite rolls with a high-hardness working layer and a high-toughness core are widely used in steel industry. However, significant differences in carbon content and alloying element content between HSS and DI lead to poor bonding and deteriorated performance between outer layer and inner core. Therefore, in this paper, an ultra-high carbon steel (UHCS) middle layer was introduced, a three-step pouring centrifugal casting process was adopted, and optimal process parameters were obtained by finite element simulation to fabricate three-layer HSS composite roll. The addition of UHCS middle layer achieved a continuous variation in microstructure and hardness and a substantial reduction in number of interfacial defects and realized a metallurgical bond between outer layer and inner core, with tonnage per millimeter of wear increased by 20%. Carbide segregation was present in HSS outer layer, where the outer working layer had a high carbon content and the inner bonding layer had a low carbon content. This characteristic not only ensured performance of working layer but also facilitated a sound bond with middle layer.