Modeling of Ni Diffusion Induced Austenite Formation in Ferritic Stainless Steel Interconnects

Ming Chen; Sebastian Molin; L. Zhang; Na Ta; Peter Vang Hendriksen; Wolff-Ragnar Kiebach; Y. Du

doi:10.1149/06801.1691ecst

Modeling of Ni Diffusion Induced Austenite Formation in Ferritic Stainless Steel Interconnects

Ming Chen, Sebastian Molin, L. Zhang, Na Ta, Peter Vang Hendriksen, Wolff-Ragnar Kiebach, Y. Du

Department of Energy Conversion and Storage

Central South University

Research output: Contribution to journal › Conference article › Research › peer-review

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Abstract

Ferritic stainless steel interconnect plates are widely used in planar solid oxide fuel cell (SOFC) or electrolysis cell (SOEC) stacks. During stack production and operation, nickel from the Ni/YSZ fuel electrode or from the Ni contact component diffuses into the IC plate, causing transformation of the ferritic phase into an austenitic phase in the interface region. This is accompanied with changes in volume and in mechanical and corrosion properties of the IC plates. In this work, kinetic modeling of the inter-diffusion between Ni and FeCr based ferritic stainless steel was conducted, using the CALPHAD approach with the DICTRA software. The kinetics of inter-diffusion and austenite formation was explored in full detail, as functions of layer thickness, temperature, time, and steel composition. The simulation was further validated by comparing with experimental results. Growth of the austenite phase in commercial interconnect materials is predicted to take place under practical stack operation conditions.

© 2015 ECS - The Electrochemical Society

Original language	English
Journal	E C S Transactions
Volume	68
Issue number	1
Pages (from-to)	1691-1700
Number of pages	10
ISSN	1938-5862
DOIs	https://doi.org/10.1149/06801.1691ecst
Publication status	Published - 2015
Event	ECS Conference on Electrochemical Energy Conversion & Storage with SOFC–XIV - Glasgow, United Kingdom Duration: 26 Jul 2015 → 31 Jul 2015

Conference

Conference	ECS Conference on Electrochemical Energy Conversion & Storage with SOFC–XIV
Country/Territory	United Kingdom
City	Glasgow
Period	26/07/2015 → 31/07/2015

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title = "Modeling of Ni Diffusion Induced Austenite Formation in Ferritic Stainless Steel Interconnects",

abstract = "Ferritic stainless steel interconnect plates are widely used in planar solid oxide fuel cell (SOFC) or electrolysis cell (SOEC) stacks. During stack production and operation, nickel from the Ni/YSZ fuel electrode or from the Ni contact component diffuses into the IC plate, causing transformation of the ferritic phase into an austenitic phase in the interface region. This is accompanied with changes in volume and in mechanical and corrosion properties of the IC plates. In this work, kinetic modeling of the inter-diffusion between Ni and FeCr based ferritic stainless steel was conducted, using the CALPHAD approach with the DICTRA software. The kinetics of inter-diffusion and austenite formation was explored in full detail, as functions of layer thickness, temperature, time, and steel composition. The simulation was further validated by comparing with experimental results. Growth of the austenite phase in commercial interconnect materials is predicted to take place under practical stack operation conditions.{\textcopyright} 2015 ECS - The Electrochemical Society",

author = "Ming Chen and Sebastian Molin and L. Zhang and Na Ta and Hendriksen, {Peter Vang} and Wolff-Ragnar Kiebach and Y. Du",

year = "2015",

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T1 - Modeling of Ni Diffusion Induced Austenite Formation in Ferritic Stainless Steel Interconnects

AU - Chen, Ming

AU - Molin, Sebastian

AU - Zhang, L.

AU - Ta, Na

AU - Hendriksen, Peter Vang

AU - Kiebach, Wolff-Ragnar

AU - Du, Y.

PY - 2015

Y1 - 2015

N2 - Ferritic stainless steel interconnect plates are widely used in planar solid oxide fuel cell (SOFC) or electrolysis cell (SOEC) stacks. During stack production and operation, nickel from the Ni/YSZ fuel electrode or from the Ni contact component diffuses into the IC plate, causing transformation of the ferritic phase into an austenitic phase in the interface region. This is accompanied with changes in volume and in mechanical and corrosion properties of the IC plates. In this work, kinetic modeling of the inter-diffusion between Ni and FeCr based ferritic stainless steel was conducted, using the CALPHAD approach with the DICTRA software. The kinetics of inter-diffusion and austenite formation was explored in full detail, as functions of layer thickness, temperature, time, and steel composition. The simulation was further validated by comparing with experimental results. Growth of the austenite phase in commercial interconnect materials is predicted to take place under practical stack operation conditions.© 2015 ECS - The Electrochemical Society

AB - Ferritic stainless steel interconnect plates are widely used in planar solid oxide fuel cell (SOFC) or electrolysis cell (SOEC) stacks. During stack production and operation, nickel from the Ni/YSZ fuel electrode or from the Ni contact component diffuses into the IC plate, causing transformation of the ferritic phase into an austenitic phase in the interface region. This is accompanied with changes in volume and in mechanical and corrosion properties of the IC plates. In this work, kinetic modeling of the inter-diffusion between Ni and FeCr based ferritic stainless steel was conducted, using the CALPHAD approach with the DICTRA software. The kinetics of inter-diffusion and austenite formation was explored in full detail, as functions of layer thickness, temperature, time, and steel composition. The simulation was further validated by comparing with experimental results. Growth of the austenite phase in commercial interconnect materials is predicted to take place under practical stack operation conditions.© 2015 ECS - The Electrochemical Society

U2 - 10.1149/06801.1691ecst

DO - 10.1149/06801.1691ecst

M3 - Conference article

SN - 1938-5862

VL - 68

SP - 1691

EP - 1700

JO - E C S Transactions

JF - E C S Transactions

IS - 1

T2 - ECS Conference on Electrochemical Energy Conversion & Storage with SOFC–XIV

Y2 - 26 July 2015 through 31 July 2015

ER -

Modeling of Ni Diffusion Induced Austenite Formation in Ferritic Stainless Steel Interconnects

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