T91 steel in oxidizing LBE shows grain-boundary corrosion that slows via localized Cr depletion and martensite decomposition, controlled by a coherent oxide scale, and develops an iron-enriched BCC surface phase contradicting prior oxide-only reports.
In the reducing environment, the dissolution of elements (Cr, Ni, Fe…) plays the main role in the corrosion, which induces a corrosion pattern that does not follow the GBs
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Corrosion Evolution of T91 Steel in Static Lead-Bismuth Eutectic Under an Oxidising Environment
T91 steel in oxidizing LBE shows grain-boundary corrosion that slows via localized Cr depletion and martensite decomposition, controlled by a coherent oxide scale, and develops an iron-enriched BCC surface phase contradicting prior oxide-only reports.