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<p>Nickel-based composite plates (Inconel625/X65) show great potential in the manufacture of high-end equipment due to their excellent all-round comprehensive properties. However, severe elemental segregation at the interface under welding thermal cycling can lead to excessive precipitation of brittle phases (e.g., MC, M<sub>23</sub>C<sub>6</sub>, Laves), which can deteriorate the mechanical properties of weld joints. This study investigated the effect of Ni/Invar interlayers on interfacial elemental diffusion for the heat-affected zone (HAZ) with different heat inputs. The results show that Ni and Invar interlayers significantly inhibit the elemental diffusion and reduce the generation of reticulated segregated phases (MC, M<sub>23</sub>C<sub>6</sub>, Laves ) at the interface. For the case of higher heat input, the carburized layer width decreased, while Carburized layer grain size increased. With the heat input of 8&#xa0;kJ/cm, the width of the carburized layer with Ni interlayer was only 25.1&#xa0;μm, and the average grain size (31.8&#xa0;μm). The microhardness of the Inconel 625 interface reduced by 15% with Invar interlayer, whereas it maintained microhardness comparable to that of the weld (264 HV) with a Ni interlayer. The impact toughness of the heat-affected zone increased with heat input, which was attributed to the high heat input homogenizing the microstructure while eliminating fusion zone defects. The highest impact toughness (319.3&#xa0;J/cm<sup>2</sup>) with 8&#xa0;kJ/cm was 15 times higher than that with 4&#xa0;kJ/cm, which is attributed to the large amount of energy dissipated by the interfacial tearing process.</p>

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Interfacial Microstructural Characteristic and Mechanical Properties of Inconel625/X65 Composite Plate with Different Interlayers and Different Heat Inputs

  • 期刊论文

  • 发表日期：

    2025年10月25日

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  • Cuixin Chen,
  • Bin Feng,
  • Jun He,
  • Weibing Guo,
  • Haitao Xue,
  • Baoxi Liu,
  • Yang Guo

摘要

Nickel-based composite plates (Inconel625/X65) show great potential in the manufacture of high-end equipment due to their excellent all-round comprehensive properties. However, severe elemental segregation at the interface under welding thermal cycling can lead to excessive precipitation of brittle phases (e.g., MC, M23C6, Laves), which can deteriorate the mechanical properties of weld joints. This study investigated the effect of Ni/Invar interlayers on interfacial elemental diffusion for the heat-affected zone (HAZ) with different heat inputs. The results show that Ni and Invar interlayers significantly inhibit the elemental diffusion and reduce the generation of reticulated segregated phases (MC, M23C6, Laves ) at the interface. For the case of higher heat input, the carburized layer width decreased, while Carburized layer grain size increased. With the heat input of 8 kJ/cm, the width of the carburized layer with Ni interlayer was only 25.1 μm, and the average grain size (31.8 μm). The microhardness of the Inconel 625 interface reduced by 15% with Invar interlayer, whereas it maintained microhardness comparable to that of the weld (264 HV) with a Ni interlayer. The impact toughness of the heat-affected zone increased with heat input, which was attributed to the high heat input homogenizing the microstructure while eliminating fusion zone defects. The highest impact toughness (319.3 J/cm2) with 8 kJ/cm was 15 times higher than that with 4 kJ/cm, which is attributed to the large amount of energy dissipated by the interfacial tearing process.