High-resolution Characterization of Cold Working Effects on the Oxidation Behavior of Alumina-Forming Austenitic (AFA) Steel in Lead-Bismuth Eutectic (LBE) with 10-6 Wt.% Oxygen at 600°C
Journal of Nuclear Materials(2025)SCI 2区SCI 1区
China Nuclear Power Technology Research Institute
Abstract
The solution-annealed and cold-worked AFA steels with surface grinding exposed to LBE at 600°C with 10-6 wt.% oxygen were investigated using high-resolution characterization techniques. After 500 h exposure, both steels developed protective oxide scales. After 1700 h, solution-annealed steel exhibited dissolution corrosion pits, because Cr and Al in fine grains formed by recrystallization of the surface-grinding subsurface were depleted, forming internal (Cr, Al)2O3 nodules that caused the initially developed oxide scales to exfoliate due to increased local stress. Following cold working, increased dislocations and grain boundaries facilitated replenishment of Cr&Al in the subsurface, maintaining the durability of external (Cr, Al)2O3 scales, preventing dissolution attack.
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Key words
Alumina-forming austenitic steel,Lead-bismuth eutectic,Cold working,Oxidation
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