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Phase Field Modeling Of Oxide Growth In An Aged Fe-Cr

Picture for Phase Field Modeling Of Oxide Growth In An Aged Fe-Cr

Duplex stainless steels (DSS) are widely used as structural alloys in marine and energy industries because of their excellent combination of mechanical properties and corrosion resistance. In light water reactor (LWR) power plants, these alloys find their applications in piping and internal structural components. With a currently designed lifetime of 40 years, these DSS components show little degradation in their mechanical properties. However, most current and future nuclear power plants are expected to operate beyond 60 years. This prolonged service period challenges the integrity of materials and components in the reactor. DSS component lifetime in the reactor is subjected to elevated temperatures, internal pressures, and corrosive environments.

Product Number: ED22-17141-SG
Author: Yongfeng Zhang, Líney Árnadóttir, Julie Tucker, Burkan Isgor, Kofi Oware Sarfo, Larry Aagesen
Publication Date: 2022
$20.00
$20.00
$20.00

A phase-field model for diffusion-controlled oxide growth has been developed and implemented in the MOOSE framework for oxide growth over a Fe-Cr metallic alloy at different aging stages. The aging and the corresponding precipitation of the phase are modeled by a separate phase-field model to obtain the input microstructure for subsequent oxide growth. An order parameter is used to differentiate the oxide and the metal phase, to track the propagation of the oxide phase driven by the chemical potential gradient. The mobility of oxygen is set as dependent on the local composition, e.g., Cr concentration, to study the effect of aging. It is found that the oxide growth rate is dependent on the volumetric fraction of  phase and thereby the aging time. The results on both phase separation and oxide growth are calibrated using the experimental results on duplex stainless steel.

A phase-field model for diffusion-controlled oxide growth has been developed and implemented in the MOOSE framework for oxide growth over a Fe-Cr metallic alloy at different aging stages. The aging and the corresponding precipitation of the phase are modeled by a separate phase-field model to obtain the input microstructure for subsequent oxide growth. An order parameter is used to differentiate the oxide and the metal phase, to track the propagation of the oxide phase driven by the chemical potential gradient. The mobility of oxygen is set as dependent on the local composition, e.g., Cr concentration, to study the effect of aging. It is found that the oxide growth rate is dependent on the volumetric fraction of  phase and thereby the aging time. The results on both phase separation and oxide growth are calibrated using the experimental results on duplex stainless steel.

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