TY  - JOUR
AU  - Jalowicka, A.
AU  - Nowak, W. J.
AU  - Naumenko, D.
AU  - Quadakkers, W. J.
TI  - Effect of SO2 Addition on Air Oxidation Behavior of CM247 and CMSX-4 at 1050°C
JO  - JOM
VL  - 68
IS  - 11
SN  - 1543-1851
CY  - New York, NY
PB  - Springer Science + Business Media
M1  - FZJ-2017-08416
SP  - 2776 - 2785
PY  - 2016
AB  - In the present work, the oxidation behavior of two commercial Ni-base superalloys, CMSX-4 and CM247, in synthetic air with and without 2 vol.% SO2 at 1050°C has been studied. The corrosion reactions in the presence of SO2 could not be explained simply in terms of the contents of the main scale‐forming alloying elements, Cr and Al. The far better resistance of CMSX-4 is related to the formation of a rather pure and dense alumina scale after a very short period of transient oxidation. Rapid development of an alumina scale prevents access of molecular SO2 to the metal surface thus effectively suppressing internal sulfidation. In contrast, CM247 with a similar Al-content formed an Al-rich oxide scale with local intrusions and/or inhomogeneities caused by the underlying alloy microstructure, which deteriorated its resistance to internal sulfidation and resulted in rapid failure in synthetic air + 2% SO2.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000388816100012
DO  - DOI:10.1007/s11837-016-2072-1
UR  - https://juser.fz-juelich.de/record/841331
ER  -