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<p>The intergranular corrosion (IGC)&#xa0;resistance of IN600 aged at 700&#xa0;°C during 300-h gas metal arc&#xa0;welded to an AL6XN was studied to assess an alternative for repairing an IN600 component after long-time exposure at high-temperature. An ERNiCrMo3 electrode, gas mixture of 97%Ar + 3%N<sub>2</sub>, and a heat input ~ 1.5&#xa0;kJ/mm were&#xa0;used. Microstructural characterization of the welded joint was correlated with the IGC resistance&#xa0;of the weld zone, evaluated in a 2MH<sub>2</sub>SO<sub>4</sub> + 1MHCl + 0.5MNaCl solution with a three-electrode electrochemical cell. The results, in terms of reactivation and activation current ratio (I<sub>R</sub>/I<sub>A</sub>), showed that the&#xa0;heat-affected zone (HAZ) of the AL6XN and weld metal had ratio values of ~ 0.0003 ± 1 × 10<sup>–4</sup> and ~ 0.002 ± 1 × 10<sup>–4</sup>, respectively. The I<sub>R</sub>/I<sub>A</sub> ratio for the HAZ of IN600 was ~ 0.01 ± 5.8 × 10<sup>–3</sup>, meaning that it is twice susceptible to IGC than the HAZ of AL6XN. This behavior correlates with the Cr-rich precipitates found near the grain boundaries in the HAZ and weld metal at the IN600 side of the welded joint.</p> Graphical abstract <p></p>

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Intergranular corrosion of the dissimilar welded joint AL6XN/IN600 as a repair or replace option of an IN600 after long-time high-temperature exposition

  • 期刊论文

  • 发表日期：

    2025年4月24日

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  • Ventura Lilia Cruz-Hernández,
  • Marco Arturo García-Rentería,
  • Jhonatan Alexander de la Cruz de la Cerda,
  • Héctor Javier Miranda Yniestra,
  • Víctor Hugo López-Morelos

摘要

The intergranular corrosion (IGC) resistance of IN600 aged at 700 °C during 300-h gas metal arc welded to an AL6XN was studied to assess an alternative for repairing an IN600 component after long-time exposure at high-temperature. An ERNiCrMo3 electrode, gas mixture of 97%Ar + 3%N2, and a heat input ~ 1.5 kJ/mm were used. Microstructural characterization of the welded joint was correlated with the IGC resistance of the weld zone, evaluated in a 2MH2SO4 + 1MHCl + 0.5MNaCl solution with a three-electrode electrochemical cell. The results, in terms of reactivation and activation current ratio (IR/IA), showed that the heat-affected zone (HAZ) of the AL6XN and weld metal had ratio values of ~ 0.0003 ± 1 × 10–4 and ~ 0.002 ± 1 × 10–4, respectively. The IR/IA ratio for the HAZ of IN600 was ~ 0.01 ± 5.8 × 10–3, meaning that it is twice susceptible to IGC than the HAZ of AL6XN. This behavior correlates with the Cr-rich precipitates found near the grain boundaries in the HAZ and weld metal at the IN600 side of the welded joint.

Graphical abstract