Effects of chemical composition and dose on microstructure evolution and hardening of neutron-irradiated reactor pressure vessel steels

Takeuchi, Tomoaki ; Kuramoto, Akira*; Kameda, Jun*; Toyama, Takeshi*; Nagai, Yasuyoshi*; Hasegawa, Masayuki*; Okubo, Tadakatsu*; Yoshiie, Toshimasa*; Nishiyama, Yutaka ; Onizawa, Kunio

This study reports the effects of the composition and dose on microstructure evolution and hardening in high- and low-impurity A533B-1 steels neutron-irradiated in a wide range from 0.32 to 9.9 10 $^{19}$ n cm $^{-2}$ (E 1 MeV) under a constant high flux at JMTR. The early hardening was found to be caused by mainly matrix defects. The gradual hardening after middle stage of irradiation was found to be caused by the formation of Cu rich clusters (CRCs) and Mn-Ni-Si rich clusters (MNSCs), respectively, in the high- and low-impurity steels. By applying a RB model, it was found that the dislocation-pinning strength of the CRCs and MNSCs is almost the same. Moreover, the high-impurity steel subjected to the highest dose revealed the formation of MNSCs.

Language	:	English
Journal	:	Journal of Nuclear Materials
Volume	:	402
Number	:	2-3
Pages	:	p.93 - 101
Publication Year/Month	:	2010/07
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Paper URL	:	https://doi.org/10.1016/j.jnucmat.2010.04.008
DOI for research data	:
Keywords	:	no keyword
Research Facility	:	JMTR(材料試験炉)
Press Release	:
Article of JAEA R&D Review	:	Toward Safe Long-Term Service of Reactor Pressure Vessels; Prediction of the Service Life Based on Nano-Scale Structural Analysis[/]
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InCites™	:	Percentile:96.23 Category:Materials Science, Multidisciplinary
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Registration No. : AA20090831
JAEA Abstracts No. : 43001301
Paper Submission No. : 16389

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