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<p>This study explores the fabrication of sandwich-laminated composite structures comprising high-chromium cast iron (HCCI) powder encased in low-carbon steel (LCS) using a hot-rolling process conducted at 1100&#xa0;°C. The composites were produced under three distinct cumulative reduction ratios: 30%, 40%, and 50%. We conducted a comprehensive examination of the specimen’s microstructure, elemental diffusion, and hardness using various indentation tests. The findings reveal that a metallurgical bond was successfully established between the HCCI powder and the LCS. Notably, chromium diffusion was also observed. Our results indicate that an increase in cumulative undercut during hot rolling leads to a refinement of the HCCI’s microstructure, incorporation of more carbide particles within the material matrix, and a more uniform distribution of these particles. Additionally, as cumulative deformation intensifies, the M<sub>7</sub>C<sub>3</sub> carbide within the HCCI re-dissolves into the matrix, contributing to a reduction in material hardness.</p>

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Study on the Properties of High-Chromium Cast Iron Powder/Mild Steel Bimetallic Composite Plates Fabricated Through Hot Rolling

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Yulin Xing,
  • Songning Li,
  • Xiaogang Wang,
  • Wenbo Gao,
  • Yunlong Zhu

摘要

This study explores the fabrication of sandwich-laminated composite structures comprising high-chromium cast iron (HCCI) powder encased in low-carbon steel (LCS) using a hot-rolling process conducted at 1100 °C. The composites were produced under three distinct cumulative reduction ratios: 30%, 40%, and 50%. We conducted a comprehensive examination of the specimen’s microstructure, elemental diffusion, and hardness using various indentation tests. The findings reveal that a metallurgical bond was successfully established between the HCCI powder and the LCS. Notably, chromium diffusion was also observed. Our results indicate that an increase in cumulative undercut during hot rolling leads to a refinement of the HCCI’s microstructure, incorporation of more carbide particles within the material matrix, and a more uniform distribution of these particles. Additionally, as cumulative deformation intensifies, the M7C3 carbide within the HCCI re-dissolves into the matrix, contributing to a reduction in material hardness.