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Oxidation studies of Fe10CrAl-RE alloys exposed to Pb at 550 degrees C for 10,000 h

J. Ejenstam ; Mats Halvarsson (Institutionen för teknisk fysik, Materialens mikrostruktur ) ; Jonathan Weidow (Institutionen för teknisk fysik, Materialens mikrostruktur ) ; B. Jonsson ; P. Szakalos
Journal of Nuclear Materials (0022-3115). Vol. 443 (2013), 1-3, p. 161-170.
[Artikel, refereegranskad vetenskaplig]

Five experimental FeCrAl-RE alloys have been exposed up to 10,000 h in stagnant liquid Pb at 550 C. The test matrix consisted of three 10 wt.% Cr alloys, with an Al content ranging from 4 to 8 wt.% (10Cr-4Al, 10Cr-6Al and 10Cr-8Al), one alloy without additions of reactive elements (RE) (10Cr-6Al), and one reference alloy with 21 wt.% Cr and 5 wt.% Al (21Cr-5Al). The evaluation showed a clear difference in oxidation properties, and it was possible to divide the alloys into two distinct groups. A critical Al concentration in the interval of 4-6 wt.% at the given RE content was required to form a thin protective oxide. However, the absence of RE addition in one of the two 10Cr-6Al alloys resulted in a significant reduction in oxidation resistance, comparable with 10Cr-4Al. None of the alloys were severely corroded, however Pb penetrated to a relatively large extent into the porous oxide of the low performing alloys. A 100 nm thick oxide scale, partly consisting of alumina (Al2O3), was observed for the high performing 10Cr-6Al alloy. The Fe10CrAl-RE alloys showed overall very good corrosion resistance and are hence a promising new alloy category for liquid Pb applications. (C) 2013 Elsevier B.V. All rights reserved.

Nyckelord: surface-treated steels, liquid lead-bismuth, spinodal decomposition, high-temperature, atomic-level, corrosion behavior, computer-models, kanthal af, al alloys, phase-separation



Denna post skapades 2014-01-09.
CPL Pubid: 192016

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Materialens mikrostruktur (2012-2015)

Ämnesområden

Materialteknik

Chalmers infrastruktur