Impact of Iron in M5TM6

TL;DRAbstract

To assess the effect of iron (Fe) content on the properties of M5™, several industrial-sized ingots with Fe content up to 1000 ppm and some smaller ingots with Fe up to 1300 ppm have been manufactured, tested, and investigated. The evolution of the microstructure with iron content has been both experimentally determined and theoretically assessed with thermodynamic computations, showing that iron in the investigated range has only a slight impact on the balance between the two classical second-phase precipitates observed in M5™: β-Nb and Laves phase. Moreover, it was found that the impact of iron on texture and mechanical properties, including thermal creep, is null. Out-of-pile autoclave corrosion tests show, on the one hand, that the iron content has no effect in 360°C primary water environment and little effect in 400°C–415°C steam. On the other hand, iron content in the range of 300 to 1000 ppm improves the resistance to corrosion induced by galvanic phenomena. This phenomenon has

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