UKAEA-CCFE-PR(26)452
Understanding preferential intergranular oxidation in Alloy X-750 in 480 °C CO-CO2 environments at the nanoscale
Alloy X-750 was exposed to a 480 °C CO-CO2 reducing gas mixture at an oxygen partial pressure below the NiO dissociation pressure. Post-exposure analytical transmission electron microscopy (ATEM) analysis confirmed the occurrence of preferential intergranular oxidation (PIO) and internal oxidation which resulted in the formation of Ni nodules. Thus, reducing CO-CO2 mixtures can promote intergranular oxidation in Alloy X-750, similar to observations in Alloy 600 exposed to identical environments. In Alloy X-750, intergranular oxidation of Ti and Al are observed to occur prior to Cr oxidation, while the presence of intergranular Cr carbides hinders PIO penetration depth.