Abstract
The present work investigates the role of Nb (C, N) precipitates and Cr-carbides on the high-temperature fracture behavior of Super304H steel. To accomplish this, both as-received and sensitised steels were subjected to in-situ tensile testing at 650 °C. Both samples exhibit the formation of primary cracks along the coarse (>3 µm) Nb (C, N) precipitates and their decohesion. Additionally, in sensitised samples, Cr-carbides embrittle the grain boundaries resulting in reduced ductility (36 %) and toughness (39 %). Moreover, fine cracks initiation/propagation along the grain boundary Cr-carbides (typically a weaker region in sensitised steels) is observed.
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