TY - JOUR
T1 - Oxygen-driven de-alloying of Fe-14Cr-12Ni-10Mn-3Cu-2.5Al-1Nb austenitic steel at 500 °C in static Pb-Bi eutectic with concentration of dissolved oxygen alternating from ∼10-6 to 10-9 mass% for 10000 h
AU - Tsisar, Valentyn
AU - Stergar, Erich
AU - Gavrilov, Serguei
AU - Maia, Eloa Lopes
AU - Van Renterghem, Wouter
AU - Louette, Pierre
AU - Lucas, Stéphane
N1 - Publisher Copyright:
© 2024
PY - 2025/3
Y1 - 2025/3
N2 - A high-Mn austenitic steel Fe-14Cr-12Ni-10Mn-3Cu-2.5Al-1Nb was tested at 500 °C in static Pb-Bi eutectic for 10000 h. In the course of the test, oxygen concentration in liquid metal was cycled from ∼10-6 to ∼10-9 mass%, which provides oxidation and dissolution regimes, respectively. After 10000 h exposure steel showed formation of ferrite corrosion zone depleted in Mn, Ni, Cu, Cr, Fe and penetrated by Pb and Bi. Average depth of corrosion is 15±5 µm, while maximum corrosion depth locally reaches ∼35 µm. Dissolved Mn and Cr re-precipitated in the vicinity of steel surface in a form of stratified Mn-O/Cr-Mn-O oxide scale. Obtained results were compared to those of similar Al-alloyed austenitic steels with lower Mn content, which exhibited protective oxidation under same test conditions. The phenomenological mechanism of oxygen-driven de-alloying of steel in Pb-Bi[O] is discussed.
AB - A high-Mn austenitic steel Fe-14Cr-12Ni-10Mn-3Cu-2.5Al-1Nb was tested at 500 °C in static Pb-Bi eutectic for 10000 h. In the course of the test, oxygen concentration in liquid metal was cycled from ∼10-6 to ∼10-9 mass%, which provides oxidation and dissolution regimes, respectively. After 10000 h exposure steel showed formation of ferrite corrosion zone depleted in Mn, Ni, Cu, Cr, Fe and penetrated by Pb and Bi. Average depth of corrosion is 15±5 µm, while maximum corrosion depth locally reaches ∼35 µm. Dissolved Mn and Cr re-precipitated in the vicinity of steel surface in a form of stratified Mn-O/Cr-Mn-O oxide scale. Obtained results were compared to those of similar Al-alloyed austenitic steels with lower Mn content, which exhibited protective oxidation under same test conditions. The phenomenological mechanism of oxygen-driven de-alloying of steel in Pb-Bi[O] is discussed.
KW - Austenitic stainless steel
KW - Corrosion
KW - De-alloying
KW - Liquid lead-bismuth eutectic
KW - Oxidation
UR - http://www.scopus.com/inward/record.url?scp=85208572309&partnerID=8YFLogxK
U2 - 10.1016/j.corcom.2024.01.002
DO - 10.1016/j.corcom.2024.01.002
M3 - Article
AN - SCOPUS:85208572309
SN - 2667-2669
VL - 17
SP - 1
EP - 11
JO - Corrosion Communication
JF - Corrosion Communication
ER -