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Thermodynamic models of low-temperature Mn–Ni–Si precipitation in reactor pressure vessel steels

Published online by Cambridge University Press:  15 August 2014

Wei Xiong
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706
Huibin Ke
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706
Ramanathan Krishnamurthy
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706
Peter Wells
Affiliation:
Materials Department, University of California, Santa Barbara, California 93106
Leland Barnard
Affiliation:
Materials Science Program, University of Wisconsin, Madison, Wisconsin 53706
G. Robert Odette
Affiliation:
Materials Department, University of California, Santa Barbara, California 93106; Mechanical Engineering, University of California, Santa Barbara, California 93106
Dane Morgan
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin, Madison, Wisconsin 53706; Materials Science Program, University of Wisconsin, Madison, Wisconsin 53706
Corresponding
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Abstract

Large volume fractions of Mn–Ni–Si (MNS) precipitates formed in irradiated light water reactor pressure vessel (RPV) steels cause severe hardening and embrittlement at high neutron fluence. A new equilibrium thermodynamic model was developed based on the CALculation of PHAse Diagrams (CALPHAD) method using both commercial (TCAL2) and specially assembled databases to predict precipitation of these phases. Good agreement between the model predictions and experimental data suggest that equilibrium thermodynamic models provide a basis to predict terminal MNS precipitation over wider range of alloy compositions and temperatures, and can also serve as a foundation for kinetic modeling of precipitate evolution.

Type
Research Letters
Copyright
Copyright © Materials Research Society 2014 

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