TY - JOUR
T1 - Hardening and microstructural evolution of A533b steels irradiated with Fe ions and electrons
AU - Watanabe, H.
AU - Arase, S.
AU - Yamamoto, T.
AU - Wells, P.
AU - Onishi, T.
AU - Odette, G. R.
N1 - Funding Information:
This study was supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Numbers 23360418 , 26630487 , and 26289362 . This study was also supported partly by the Kansai Electric Power Company and the Collaborative Research Program of the Research Institute for Applied Mechanics, Kyushu University .
Publisher Copyright:
© 2016 Elsevier B.V. All rights reserved.
PY - 2016/4/1
Y1 - 2016/4/1
N2 - Radiation hardening and embrittlement of A533B steels is heavily dependent on the Cu content. In this study, to investigate the effect of copper on the microstructural evolution of these materials, A533B steels with different Cu levels were irradiated with 2.4 MeV Fe ions and 1.0 MeV electrons. Ion irradiation was performed from room temperature (RT) to 350°C with doses up to 1 dpa. At RT and 290°C, low dose (<0.1 dpa) hardening trend corresponded with ΔH ∝ (dpa)n, with n initially approximately 0.5 and consistent with a barrier hardening mechanism, but saturating at ≈0.1 dpa. At higher dose levels, the radiation-induced hardening exhibited a strong Cu content dependence at 290°C, but not at 350°C. Electron irradiation using high-voltage electron microscopy revealed the growth of interstitial-type dislocation loops and enrichment of Ni, Mn, and Si in the vicinities of pre-existing dislocations at doses for which the radiation-induced hardness due to ion irradiation was prominent.
AB - Radiation hardening and embrittlement of A533B steels is heavily dependent on the Cu content. In this study, to investigate the effect of copper on the microstructural evolution of these materials, A533B steels with different Cu levels were irradiated with 2.4 MeV Fe ions and 1.0 MeV electrons. Ion irradiation was performed from room temperature (RT) to 350°C with doses up to 1 dpa. At RT and 290°C, low dose (<0.1 dpa) hardening trend corresponded with ΔH ∝ (dpa)n, with n initially approximately 0.5 and consistent with a barrier hardening mechanism, but saturating at ≈0.1 dpa. At higher dose levels, the radiation-induced hardening exhibited a strong Cu content dependence at 290°C, but not at 350°C. Electron irradiation using high-voltage electron microscopy revealed the growth of interstitial-type dislocation loops and enrichment of Ni, Mn, and Si in the vicinities of pre-existing dislocations at doses for which the radiation-induced hardness due to ion irradiation was prominent.
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U2 - 10.1016/j.jnucmat.2015.12.045
DO - 10.1016/j.jnucmat.2015.12.045
M3 - Article
AN - SCOPUS:84954357252
SN - 0022-3115
VL - 471
SP - 243
EP - 250
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
ER -