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<p>This study investigates the fabrication of IN625 thin walls using CMT- and GTAW-based WAAM, focusing on the microstructural and mechanical properties. Microstructural analysis revealed the widespread presence of Laves phase and carbide precipitates in the GTAW manufactured wall, leading to a significant reduction in its mechanical performance. In contrast, the CMT-processed wall exhibited localized Laves phase formation, primarily confined to specific regions, resulting in superior tensile properties. The lower heat input inherent to the CMT process, driven by wire retraction and short-circuiting, effectively minimized Laves phase formation and promoted a finer microstructure. These findings underscore the advantages of CMT-WAAM over GTAW-WAAM, demonstrating its potential for producing components with improved structural integrity, making it a more favorable technique compared to GTAW for critical applications in aerospace and energy sectors.</p> Graphical abstract <p></p>

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Comparative Analysis of Microstructure and Mechanical Properties in CMT- and GTAW-Based Wire Arc Directed Energy Deposited Inconel 625

  • 期刊论文

  • 发表日期：

    2025年5月17日

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  • Gaurav Parmar,
  • Bunty Tomar,
  • Mukul Anand,
  • Raushan Kumar,
  • S. Shiva,
  • Alok Kumar Das

摘要

This study investigates the fabrication of IN625 thin walls using CMT- and GTAW-based WAAM, focusing on the microstructural and mechanical properties. Microstructural analysis revealed the widespread presence of Laves phase and carbide precipitates in the GTAW manufactured wall, leading to a significant reduction in its mechanical performance. In contrast, the CMT-processed wall exhibited localized Laves phase formation, primarily confined to specific regions, resulting in superior tensile properties. The lower heat input inherent to the CMT process, driven by wire retraction and short-circuiting, effectively minimized Laves phase formation and promoted a finer microstructure. These findings underscore the advantages of CMT-WAAM over GTAW-WAAM, demonstrating its potential for producing components with improved structural integrity, making it a more favorable technique compared to GTAW for critical applications in aerospace and energy sectors.

Graphical abstract