期刊
JOURNAL OF NUCLEAR MATERIALS
卷 498, 期 -, 页码 83-88出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2017.10.008
关键词
Ferritic-martensitic steel; Heterogeneous nucleation; Dislocation; Precipitation; Cluster dynamics model
资金
- U.S. Department of Energy (DOE), Office of Nuclear Energy (NE), Integrated Research Project (IRP) [NE0000639]
- DOE Office of Fusion Energy Sciences [DE-FG03-94ER54275]
Mn-Ni-Si precipitates (MNSPs) are known to be responsible for irradiation-induced hardening and embrittlement in structural alloys used in nuclear reactors. Studies have shown that precipitation of the MNSPs in 9-Cr ferritic-martensitic (F-M) alloys, such as T91, is strongly associated with heterogeneous nucleation on dislocations, coupled with radiation-induced solute segregation to these sinks. Therefore it is important to develop advanced predictive models for Mn-Ni-Si precipitation in F-M alloys under irradiation based on an understanding of the underlying mechanisms. Here we use a cluster dynamics model, which includes multiple effects of dislocations, to study the evolution of MNSPs in a commercial F-M alloy T91. The model predictions are calibrated by data from proton irradiation experiments at 400 degrees C. Radiation induced solute segregation at dislocations is evaluated by a continuum model that is integrated into the cluster dynamics simulations, including the effects of dislocations as heterogeneous nucleation sites. The result shows that MNSPs in T91 are primarily irradiation-induced and, in particular, both heterogeneous nucleation and radiation-induced segregation at dislocations are necessary to rationalize the experimental observations. (C) 2017 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据