Advanced Microstructural Investigations of AISI 441 Early Stage Oxidation in Wet Atmosphere

Wichitra Wongpromrat; Valérie Parry; Walairat Chandra-Ambhorn; Somrerk Chandra-Ambhorn; Alain Galerie; Yves Wouters

doi:10.4028/www.scientific.net/KEM.728.3

Paper Titles

Preface

Advanced Microstructural Investigations of AISI 441 Early Stage Oxidation in Wet Atmosphere
p.3

Effect of Cu and Ni Addition on Microstructure and Wettability of Sn-Zn Solders
p.9

Influence of Ti on the Electrochemical Behavior of Al-Zn-In-Si Sacrificial Anodes
p.15

Quantification of Vanadium Precipitates after Reheating Slab Steel by Synchrotron X-Ray Absorption Spectroscopy (XAS)
p.20

Application of the Tensile Test with a CCD Camera to Assess the Adhesion of Scale to Si-Containing Hot-Rolled Steels
p.26

Investigation of Microstructure and Hardness Properties of Hardfacing Surface on SCM 440 Alloy Steel by Using Metal Active Gas and Flux Cored Arc Welding Processes
p.31

Effect of Preform Height on Die Wear in Hot Forging Process of Idle Gear by Finite Element Modeling
p.36

Influence of Process Parameters on Electric Upsetting Process by Using Finite Element Modeling
p.42

HomeKey Engineering MaterialsKey Engineering Materials Vol. 728Advanced Microstructural Investigations of AISI...

Advanced Microstructural Investigations of AISI 441 Early Stage Oxidation in Wet Atmosphere

Abstract:

AISI 441 ferritic stainless steel is a good candidate for metallic interconnects in solid oxide fuel cells (SOFCs). The minor elements Ti and Nb are used to stabilize the ferritic matrix and also to reduce creep by a combination of solid solution strengthening and precipitation of intermetallic Laves phase particles along the grain boundaries. However their influence on the oxidation behavior is not well understood. This study focuses on the early stages oxidation (from 4 to 24 h) at 800 °C of AISI 441 under 5% H₂O in O₂. A relatively smooth micro-crystallized oxide scale and Ti, Nb containing nodules are observed. The internal microstructure of these objects is studied by FIB tomography which allows computing cross sectional views in any direction of interest. FIB study reveals a complex microstructure and a development strongly linked to the presence of niobium and/or titanium in the substrate.

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Key Engineering Materials (Volume 728)

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3-8

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.728.3

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Online since:

January 2017

Authors:

Wichitra Wongpromrat, Valérie Parry*, Walairat Chandra-Ambhorn, Somrerk Chandra-Ambhorn, Alain Galerie, Yves Wouters

Keywords:

3D Reconstruction, Ferritic Steel, Interconnect, MEB-FEG-FIB, Oxidation, Solid Oxide Fuel Cells (SOFC), Wet Atmosphere

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