Microstructural changes in a Russian-type reactor weld material after neutron irradiation, post-irradiation annealing and re-irradiation studied by atom probe tomography and positron annihilation spectroscopy

被引：27

作者：

Kuramoto, A. ^{[1
]}

Toyama, T. ^{[1
]}

Nagai, Y. ^{[1
]}

Inoue, K. ^{[1
]}

Nozawa, Y. ^{[1
]}

Hasegawa, M. ^{[2
]}

Valo, M. ^{[3
]}

机构：

[1] Tohoku Univ, Inst Mat Res, Oarai Ctr, Oarai, Ibaraki 3111313, Japan

[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[3] VTT Tech Res Ctr Finland, Espoo 02044, Finland

来源：

ACTA MATERIALIA | 2013年 / 61卷 / 14期

关键词：

Irradiation embrittlement; Ferritic steel; Atom probe tomography; Positron annihilation; PRESSURE-VESSEL STEELS; MODEL ALLOYS; EMBRITTLEMENT; EVOLUTION; BEHAVIOR; IRON; MICROSCOPY; VVER-440; COPPER; SANS;

D O I：

10.1016/j.actamat.2013.05.016

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a microstructural study of a surveillance test specimen from a reactor pressure vessel steel of a Russian-type nuclear reactor after neutron irradiation, post-irradiation annealing and re-irradiation, using atom probe tomography (APT) and positron annihilation spectroscopy (PAS). The APT results showed the formation of Cu-rich solute nano-clusters (CRCs) during the initial irradiation and their subsequent coarsening during annealing. After re-irradiation, new CRCs have been observed. The irradiation-hardening almost recovered during annealing. However, by re-irradiation, hardening comparable to that by the initial irradiation was observed. The hardening due to the CRCs formed during the initial irradiation, estimated using the Russell-Brown model, was almost the same as that observed. However, the estimated hardening after the re-irradiation was about half of the measured one. The other hardening is attributed to the newly formed MDs by the re-irradiation, which was evidenced by PAS. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：5236 / 5246

页数：11

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