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<p>Carbon nanomaterials (CNMs) represent a promising reinforcement strategy for advanced welding applications. In this study, CNMs synthesized by chemical vapor deposition (CVD) were incorporated as interlayers during Resistance Spot Welding (RSW) of dual-phase 270 (DP-270) steel plates. The welded nuggets were characterized by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), Raman spectroscopy, and Fourier Transformed Infrared Spectroscopy (FTIR). SEM observations confirmed the incorporation of CNMs into the steel matrix, while EDS revealed a marked increase in carbon content for reinforced nuggets (~ 50 at.%) compared to unreinforced ones (~ 10 at.%). Raman spectra displayed characteristic D (~ 1350&#xa0;cm⁻<sup>1</sup>) and G (~ 1570&#xa0;cm⁻<sup>1</sup>) bands, with peak shifts and variations in the ID/IG ratio, evidencing structural interaction with the substrate. FTIR analyses identified hydroxyl, carbonyl, and C–H groups, indicating possible chemical bonding. The combined results demonstrate effective CNM integration, suggesting improvements in nugget cohesion and mechanical reliability, for many further applications.</p> Graphic Abstract <p></p>

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Spectral and morphological characterization of carbon nanomaterial-reinforced dual phase 270 steel in resistance spot welding

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • J. J. Contreras-Navarrete,
  • V. H. Baltazar-Hernández,
  • R. Vences-Hernández,
  • F. Reyes-Calderón,
  • L. Domratcheva-Lvova,
  • D. R. Poiré-de la Cruz

摘要

Carbon nanomaterials (CNMs) represent a promising reinforcement strategy for advanced welding applications. In this study, CNMs synthesized by chemical vapor deposition (CVD) were incorporated as interlayers during Resistance Spot Welding (RSW) of dual-phase 270 (DP-270) steel plates. The welded nuggets were characterized by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), Raman spectroscopy, and Fourier Transformed Infrared Spectroscopy (FTIR). SEM observations confirmed the incorporation of CNMs into the steel matrix, while EDS revealed a marked increase in carbon content for reinforced nuggets (~ 50 at.%) compared to unreinforced ones (~ 10 at.%). Raman spectra displayed characteristic D (~ 1350 cm⁻1) and G (~ 1570 cm⁻1) bands, with peak shifts and variations in the ID/IG ratio, evidencing structural interaction with the substrate. FTIR analyses identified hydroxyl, carbonyl, and C–H groups, indicating possible chemical bonding. The combined results demonstrate effective CNM integration, suggesting improvements in nugget cohesion and mechanical reliability, for many further applications.

Graphic Abstract