Contribution of irradiation-induced defects to hardening of a lowcopper reactor pressure vessel steel

Research output: Contribution to journalArticlepeer-review

Standard

Contribution of irradiation-induced defects to hardening of a lowcopper reactor pressure vessel steel. / Shimodaira, Masaki; Toyama, Takeshi; Yoshida, Kenta; Inoue, Koji; Ebisawa, Naoki; Tomura, Keiko; Yoshiie, Toshimasa; Konstantinovic, Milan; Gérard, Robert; Nagai, Yasuyoshi.

In: Acta Materialia, Vol. 155, 14.06.2018, p. 402-409.

Research output: Contribution to journalArticlepeer-review

Harvard

Shimodaira, M, Toyama, T, Yoshida, K, Inoue, K, Ebisawa, N, Tomura, K, Yoshiie, T, Konstantinovic, M, Gérard, R & Nagai, Y 2018, 'Contribution of irradiation-induced defects to hardening of a lowcopper reactor pressure vessel steel', Acta Materialia, vol. 155, pp. 402-409. https://doi.org/10.1016/j.actamat.2018.06.015

APA

Shimodaira, M., Toyama, T., Yoshida, K., Inoue, K., Ebisawa, N., Tomura, K., Yoshiie, T., Konstantinovic, M., Gérard, R., & Nagai, Y. (2018). Contribution of irradiation-induced defects to hardening of a lowcopper reactor pressure vessel steel. Acta Materialia, 155, 402-409. https://doi.org/10.1016/j.actamat.2018.06.015

Vancouver

Shimodaira M, Toyama T, Yoshida K, Inoue K, Ebisawa N, Tomura K et al. Contribution of irradiation-induced defects to hardening of a lowcopper reactor pressure vessel steel. Acta Materialia. 2018 Jun 14;155:402-409. https://doi.org/10.1016/j.actamat.2018.06.015

Author

Shimodaira, Masaki ; Toyama, Takeshi ; Yoshida, Kenta ; Inoue, Koji ; Ebisawa, Naoki ; Tomura, Keiko ; Yoshiie, Toshimasa ; Konstantinovic, Milan ; Gérard, Robert ; Nagai, Yasuyoshi. / Contribution of irradiation-induced defects to hardening of a lowcopper reactor pressure vessel steel. In: Acta Materialia. 2018 ; Vol. 155. pp. 402-409.

Bibtex - Download

@article{3111ea4ed16e46de91778b305f1b09ec,
title = "Contribution of irradiation-induced defects to hardening of a lowcopper reactor pressure vessel steel",
abstract = "We investigated the fluence dependence of irradiation-induced solute cluster, dislocation loop, and very small defect to reveal the hardening mechanism in surveillance test specimens from a reactor pressure vessel steel with low-Cu content (0.04 wt%) using atom probe tomography (APT), weak-beam scanning transmission electron microscopy (WB-STEM), and positron annihilation spectroscopy. A high number density (>1023m3) of solute clusters mainly composed of Ni, Mn, and Si atoms were found in highly neutron irradiated specimens (~1024 neutrons m2 (E > 1 MeV)) by APT. These solute clusters were one of the main sources of hardening as reported previously. On the other hand, it was also revealed that dislocation loops were formed with a number density of ~1022m3 in the high-fluence specimens by WB-STEM. The estimated hardening due to dislocation loops was more than half of the actual hardening, showing that dislocation loops are also main source of irradiation hardening at high neutron fluence with the solid experimental evidences. Regarding specimens subjected to a low neutron fluence (~1023 neutrons m2), very small defects, not detected by either WB-STEM or APT, were formed by positron annihilation spectroscopy. This result suggested that, at a low neutron fluence, the defects were the initial hardening source and they may grow the dislocation loops observed by WB-STEM at high fluence range",
keywords = "STEM, Atom probe tomography (APT), Positron annihilation spectroscopy, Reactor pressure vessel steels, Dislocation loop",
author = "Masaki Shimodaira and Takeshi Toyama and Kenta Yoshida and Koji Inoue and Naoki Ebisawa and Keiko Tomura and Toshimasa Yoshiie and Milan Konstantinovic and Robert G{\'e}rard and Yasuyoshi Nagai",
note = "Score=10",
year = "2018",
month = jun,
day = "14",
doi = "10.1016/j.actamat.2018.06.015",
language = "English",
volume = "155",
pages = "402--409",
journal = "Acta Materialia",
issn = "1359-6454",
publisher = "Elsevier",

}

RIS - Download

TY - JOUR

T1 - Contribution of irradiation-induced defects to hardening of a lowcopper reactor pressure vessel steel

AU - Shimodaira, Masaki

AU - Toyama, Takeshi

AU - Yoshida, Kenta

AU - Inoue, Koji

AU - Ebisawa, Naoki

AU - Tomura, Keiko

AU - Yoshiie, Toshimasa

AU - Konstantinovic, Milan

AU - Gérard, Robert

AU - Nagai, Yasuyoshi

N1 - Score=10

PY - 2018/6/14

Y1 - 2018/6/14

N2 - We investigated the fluence dependence of irradiation-induced solute cluster, dislocation loop, and very small defect to reveal the hardening mechanism in surveillance test specimens from a reactor pressure vessel steel with low-Cu content (0.04 wt%) using atom probe tomography (APT), weak-beam scanning transmission electron microscopy (WB-STEM), and positron annihilation spectroscopy. A high number density (>1023m3) of solute clusters mainly composed of Ni, Mn, and Si atoms were found in highly neutron irradiated specimens (~1024 neutrons m2 (E > 1 MeV)) by APT. These solute clusters were one of the main sources of hardening as reported previously. On the other hand, it was also revealed that dislocation loops were formed with a number density of ~1022m3 in the high-fluence specimens by WB-STEM. The estimated hardening due to dislocation loops was more than half of the actual hardening, showing that dislocation loops are also main source of irradiation hardening at high neutron fluence with the solid experimental evidences. Regarding specimens subjected to a low neutron fluence (~1023 neutrons m2), very small defects, not detected by either WB-STEM or APT, were formed by positron annihilation spectroscopy. This result suggested that, at a low neutron fluence, the defects were the initial hardening source and they may grow the dislocation loops observed by WB-STEM at high fluence range

AB - We investigated the fluence dependence of irradiation-induced solute cluster, dislocation loop, and very small defect to reveal the hardening mechanism in surveillance test specimens from a reactor pressure vessel steel with low-Cu content (0.04 wt%) using atom probe tomography (APT), weak-beam scanning transmission electron microscopy (WB-STEM), and positron annihilation spectroscopy. A high number density (>1023m3) of solute clusters mainly composed of Ni, Mn, and Si atoms were found in highly neutron irradiated specimens (~1024 neutrons m2 (E > 1 MeV)) by APT. These solute clusters were one of the main sources of hardening as reported previously. On the other hand, it was also revealed that dislocation loops were formed with a number density of ~1022m3 in the high-fluence specimens by WB-STEM. The estimated hardening due to dislocation loops was more than half of the actual hardening, showing that dislocation loops are also main source of irradiation hardening at high neutron fluence with the solid experimental evidences. Regarding specimens subjected to a low neutron fluence (~1023 neutrons m2), very small defects, not detected by either WB-STEM or APT, were formed by positron annihilation spectroscopy. This result suggested that, at a low neutron fluence, the defects were the initial hardening source and they may grow the dislocation loops observed by WB-STEM at high fluence range

KW - STEM

KW - Atom probe tomography (APT)

KW - Positron annihilation spectroscopy

KW - Reactor pressure vessel steels

KW - Dislocation loop

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/35063085

U2 - 10.1016/j.actamat.2018.06.015

DO - 10.1016/j.actamat.2018.06.015

M3 - Article

VL - 155

SP - 402

EP - 409

JO - Acta Materialia

JF - Acta Materialia

SN - 1359-6454

ER -

ID: 5494846