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<p>Annealing treatments at different temperatures were performed on an Incoloy825/X80 composite plate. The microstructures and mechanical properties of the composite plate under both hot-rolling and annealing conditions were investigated. Research indicates that with the increase in annealing temperature, the prior austenite grains coarsen, the thickness of the carburized layer decreases, while the decarburized layer thickens. The optimal mechanical properties were attained after annealing at 1050 °C (tensile strength: 656&#xa0;MPa), with the X80 steel substrate primarily displaying ductile fracture, while the Incoloy825 layer exhibited mixed ductile-brittle fracture characteristics. The friction coefficient evolved through three distinct stages (“rapid increase-decline-stabilization”) as the temperature rose, and surface roughness degraded as the wear-surface temperature of the cladding layer increased. The annealing processes critically affected interfacial properties and corrosion resistance: low-temperature annealing (950 °C) improved corrosion resistance due to the high surface defect density on Incoloy825, a large capacitive arc radius in electrochemical impedance spectra, and a low passive current density; whereas annealing at 1050 °C for 1&#xa0;h facilitated sufficient interfacial elemental diffusion, significantly enhancing bonding quality while maintaining high strength/hardness in the X80 substrate and excellent corrosion resistance in the Incoloy825 cladding, thereby achieving optimal performance matching.</p>

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Microstructure and Property Analysis of Incoloy825/X80 Composite Plates under Hot Rolling and Heat Treatment

  • 期刊论文

  • 发表日期：

    2026年2月22日

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  • Min Li,
  • Qingyao Tang,
  • Guanghui Zhao,
  • Yaohui Song,
  • Juan Li,
  • Huaying Li

摘要

Annealing treatments at different temperatures were performed on an Incoloy825/X80 composite plate. The microstructures and mechanical properties of the composite plate under both hot-rolling and annealing conditions were investigated. Research indicates that with the increase in annealing temperature, the prior austenite grains coarsen, the thickness of the carburized layer decreases, while the decarburized layer thickens. The optimal mechanical properties were attained after annealing at 1050 °C (tensile strength: 656 MPa), with the X80 steel substrate primarily displaying ductile fracture, while the Incoloy825 layer exhibited mixed ductile-brittle fracture characteristics. The friction coefficient evolved through three distinct stages (“rapid increase-decline-stabilization”) as the temperature rose, and surface roughness degraded as the wear-surface temperature of the cladding layer increased. The annealing processes critically affected interfacial properties and corrosion resistance: low-temperature annealing (950 °C) improved corrosion resistance due to the high surface defect density on Incoloy825, a large capacitive arc radius in electrochemical impedance spectra, and a low passive current density; whereas annealing at 1050 °C for 1 h facilitated sufficient interfacial elemental diffusion, significantly enhancing bonding quality while maintaining high strength/hardness in the X80 substrate and excellent corrosion resistance in the Incoloy825 cladding, thereby achieving optimal performance matching.