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<p>In this study, the metallurgical, mechanical, and corrosion behaviour of wire-arc additively manufactured INCONEL 625 alloy was investigated. The specimens were subjected to single-aging and double-aging heat treatments and categorized as BM (as-built), AG1 (single-aging), and AG2 (double-aging). Texture analysis of the specimens revealed the microstructure, grain size distribution with mapping, and grain misorientation angles. Microhardness testing showed a maximum hardness of 307 HV for the AG2 specimens. Potentiodynamic polarization tests were conducted in 3.5% NaCl solution, while chronoamperometry tests were performed in 25% NaCl solution at a constant voltage of 1.3&#xa0;V for 8&#xa0;h. The results demonstrated that double-aged specimens (AG2) exhibited superior hardness and corrosion resistance compared to BM and AG1. Corroded surface characterization further substantiated the electrochemical findings, establishing the effectiveness of double-aging treatment in enhancing the performance of additively manufactured IN625 in chloride environments.</p>

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Additive Manufacturing of INCONEL 625: Influence of Post-heat Treatments on Microstructure and Corrosion Resistance in Chloride Environment

  • 期刊论文

  • 发表日期：

    2025年11月26日

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  • K. Rajesh Kannan,
  • R. Vaira Vignesh,
  • V. Ujai Karthik,
  • Dhinakaran Veeman

摘要

In this study, the metallurgical, mechanical, and corrosion behaviour of wire-arc additively manufactured INCONEL 625 alloy was investigated. The specimens were subjected to single-aging and double-aging heat treatments and categorized as BM (as-built), AG1 (single-aging), and AG2 (double-aging). Texture analysis of the specimens revealed the microstructure, grain size distribution with mapping, and grain misorientation angles. Microhardness testing showed a maximum hardness of 307 HV for the AG2 specimens. Potentiodynamic polarization tests were conducted in 3.5% NaCl solution, while chronoamperometry tests were performed in 25% NaCl solution at a constant voltage of 1.3 V for 8 h. The results demonstrated that double-aged specimens (AG2) exhibited superior hardness and corrosion resistance compared to BM and AG1. Corroded surface characterization further substantiated the electrochemical findings, establishing the effectiveness of double-aging treatment in enhancing the performance of additively manufactured IN625 in chloride environments.