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<p>The electroslag remelting solid–liquid compound casting (ESR-SLCC) technique is recognized as an advanced method for manufacturing bimetallic tube billets with location-dependent property customization. This study successfully manufactured a composite tube billet comprising P110 steel and Incoloy 825 alloy via the ESR-SLCC route. A comprehensive investigation of the interfacial region was conducted, utilizing microstructural characterization and evaluations of mechanical properties. The billet exhibits three distinct microstructural regions, including an Interfacial Transition Zone (ITZ). The ITZ shows grain refinement and carbide precipitation that increase hardness. However, decarburization and self-tempering during cooling partially offset this strengthening, resulting in mechanical properties intermediate between those of the two constituents. The elemental diffusion behavior across the interface was subsequently analyzed to clarify the accompanying microstructural evolution. During the remelting process, the high heat input of the ESR-SLCC process melted the inner surface of P110 steel, and together with the remelted 825 alloy formed a micrometer-scale Fe-Ni-Cr-C liquid film; liquid-phase diffusion rapidly diluted Fe, while Ni, Cr, and Mo became enriched in the final solidification zone. This study provides a theoretical basis for the selection of constituent metals and the optimization of processing parameters in future bimetallic tube billet fabrication.</p>

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Interfacial Characteristics and Microstructural Evolution of P110 Steel/Incoloy 825 Alloy Bimetallic Tube Billet Fabricated by Electroslag Remelting Solid–Liquid Compound Casting

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Yihang Pei,
  • Jianhua Hu,
  • Sheng Yang,
  • Jianguo Liang,
  • Jiawang Ma,
  • Fujie Wang

摘要

The electroslag remelting solid–liquid compound casting (ESR-SLCC) technique is recognized as an advanced method for manufacturing bimetallic tube billets with location-dependent property customization. This study successfully manufactured a composite tube billet comprising P110 steel and Incoloy 825 alloy via the ESR-SLCC route. A comprehensive investigation of the interfacial region was conducted, utilizing microstructural characterization and evaluations of mechanical properties. The billet exhibits three distinct microstructural regions, including an Interfacial Transition Zone (ITZ). The ITZ shows grain refinement and carbide precipitation that increase hardness. However, decarburization and self-tempering during cooling partially offset this strengthening, resulting in mechanical properties intermediate between those of the two constituents. The elemental diffusion behavior across the interface was subsequently analyzed to clarify the accompanying microstructural evolution. During the remelting process, the high heat input of the ESR-SLCC process melted the inner surface of P110 steel, and together with the remelted 825 alloy formed a micrometer-scale Fe-Ni-Cr-C liquid film; liquid-phase diffusion rapidly diluted Fe, while Ni, Cr, and Mo became enriched in the final solidification zone. This study provides a theoretical basis for the selection of constituent metals and the optimization of processing parameters in future bimetallic tube billet fabrication.