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About this Abstract
Meeting	2016 TMS Annual Meeting & Exhibition
Symposium	Computational Materials Engineering for Nuclear Reactor Applications
Presentation Title	Z-4: Cluster Dynamics Modeling of Coupling of Cu-rich and Mn-Ni-Si Precipitates in RPV Steels
Author(s)	Huibin Ke, Leland Barnard, Peter Wells, G. Robert Odette, Dane Morgan
On-Site Speaker (Planned)	Huibin Ke
Abstract Scope	Formation of large mole fractions of nano-scale Cu-rich (CRPs) and Mn-Ni-Si precipitates is the primary cause of severe in-service embrittlement of reactor pressure vessel (RPV) steels. Although the formation of CRPs has been well studied, the mechanism of Mn-Ni-Si precipitates is still under investigation. Atom probe tomography (APT) studies show that Mn-Ni-Si first forms a shell structure at CRPs, and then continues to slowly grow as an appendage, after Cu depletion, reaching large mole fractions only at very high fluence. Further, even small amounts of Cu act as a catalyst for the formation of Mn-Ni-Si precipitates. Here we report a cluster dynamics study of the evolution of both CRPs and Mn-Ni-Si precipitates in RPV steels, including the possible role of Cu as an accelerating catalyst for Mn-Ni-Si precipitation. The predicted number density, mean radius, composition and volume fraction of the precipitates are compared to available experimental results.
Proceedings Inclusion?	Planned: A print-only volume

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