Oxidation studies of Fe10CrAl-RE alloys exposed to Pb at 550 degrees C for 10,000 h
Artikel i vetenskaplig tidskrift, 2013

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.

atomic-level

corrosion behavior

liquid lead-bismuth

phase-separation

kanthal af

high-temperature

computer-models

surface-treated steels

al alloys

spinodal decomposition

Författare

J. Ejenstam

Kungliga Tekniska Högskolan (KTH)

Mats Halvarsson

Chalmers, Teknisk fysik, Materialens mikrostruktur

Jonathan Weidow

Chalmers, Teknisk fysik, Materialens mikrostruktur

B. Jonsson

Sandvik Heating Technology AB

P. Szakalos

Kungliga Tekniska Högskolan (KTH)

Journal of Nuclear Materials

0022-3115 (ISSN)

Vol. 443 161-170

Ämneskategorier

Materialteknik

DOI

10.1016/j.jnucmat.2013.07.023