Influence of Alloying Elements on the Behavior of Different Ferritic Steels and Candidate Materials for SOFC Interconnect

Garcia-Fresnillo, L.; Niewolak, L.; Meier, G. H.; Quadakkers, Willem J.

doi:10.1007/s11085-017-9777-6

Journal Article

FZJ-2017-06202

Influence of Alloying Elements on the Behavior of Different Ferritic Steels and Candidate Materials for SOFC Interconnect

Garcia-Fresnillo, L. ; Niewolak, L. ; Quadakkers, W. J. (Corresponding author)FZJ* ; Meier, G. H. (Corresponding author)

2018
Springer Science + Business Media B.V Dordrecht [u.a.]

Oxidation of metals 89(1-2), 61-80 (2018) [10.1007/s11085-017-9777-6]

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Please use a persistent id in citations: doi:10.1007/s11085-017-9777-6

Abstract: The efficiency of a solid oxide fuel cell (SOFC) can be improved by using a Ni-mesh between the ferritic steel interconnect and the Ni/YSZ anode. However, interdiffusion processes can lead to internal oxidation within the Ni-mesh and some microstructural changes, i.e., formation of an austenite zone and accelerated formation of σ-phase at the ferrite/austenite interface. These changes may adversely affect the performance of the cell during long-term operation. The present work focused on the influence of certain alloying elements on the overall behavior of the ferritic steel under simulated SOFC operating conditions to define conditions to minimize σ-phase formation without degrading the oxidation resistance and mechanical properties of the steel. The experimental results indicate that decreasing the amount of Cr and adjusting the amount of Nb, Si and W of the steel is a possible way to achieve that goal.

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