Microstructural and micromechanical characterization of intergranular oxidation in Fe-15Cr alloy

Corrosion Science, vol. 225, pp. 111613

Abstract

Fe-Cr alloy has great potential as an interconnect material for SOFCs at temperatures up to 800 °C, with Cr providing excellent oxidation resistance through the formation of a protective chromium oxide layer . However, internal brittle oxides formed at grain boundaries (GBs) can lead to severe cracking and cause material failure. Here, we report the formation of internal GBs oxide in an Fe-15 wt%Cr alloy. We carried out microstructural and chemical characterization of the intergranular oxide and performed micromechanical testing and FEM simulation to study the fracture behavior at the GBs. Our findings provide insights for improving the oxidation resistance in the material design.

Authors 12

1. Kuan Ding corresponding

   Technische Universität Darmstadt

   Affiliation as printed

   Department of Materials and Earth Sciences, Technical University of Darmstadt, Peter-Grünberg-Straße 2, 64287 Darmstadt, Germany

2. María Jazmin Duarte

   Max-Planck-Institut für Nachhaltige Materialien

   Affiliation as printed

   Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237 Düsseldorf, Germany

3. Xiao Huan Shen Aachen Steel Institute

   RWTH Aachen University

   Affiliation as printed

   Steel Institute (IEHK), RWTH Aachen University, Intzestraße 1, 52072 Aachen, Germany

4. Siyuan Zhang

   Max-Planck-Institut für Nachhaltige Materialien

   Affiliation as printed

   Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237 Düsseldorf, Germany

5. Jiejie Li

   Central South University

   Affiliation as printed

   School of Mechanical and Electrical Engineering, Central South University, 410083 Changsha, Hunan, China

6. Aleksander Kostka

   Ruhr University Bochum

   Affiliation as printed

   Center for Interface-Dominated High Performance Materials (ZGH), Ruhr University Bochum, Universitätsstraße 150, 44780 Bochum, Germany

7. Enrico Bruder

   Technische Universität Darmstadt

   Affiliation as printed

   Department of Materials and Earth Sciences, Technical University of Darmstadt, Peter-Grünberg-Straße 2, 64287 Darmstadt, Germany

8. Jianjun Li

   Central South University

   Affiliation as printed

   School of Mechanical and Electrical Engineering, Central South University, 410083 Changsha, Hunan, China

9. Wenwen Song Aachen Steel Institute

   University of Kassel · RWTH Aachen University

   Affiliation as printed

   Institute of Materials Engineering (IfW), University of Kassel, Mönchebergstraße 3, 34125 Kassel, Germany

   Steel Institute (IEHK), RWTH Aachen University, Intzestraße 1, 52072 Aachen, Germany

10. Karsten Durst

    Technische Universität Darmstadt

    Affiliation as printed

    Department of Materials and Earth Sciences, Technical University of Darmstadt, Peter-Grünberg-Straße 2, 64287 Darmstadt, Germany

11. James P. Best

    Max-Planck-Institut für Nachhaltige Materialien

    Affiliation as printed

    Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237 Düsseldorf, Germany

12. Xufei Fang corresponding

    Technische Universität Darmstadt

    Affiliation as printed

    Department of Materials and Earth Sciences, Technical University of Darmstadt, Peter-Grünberg-Straße 2, 64287 Darmstadt, Germany