Suppression effect of nano-sized oxide particles on helium irradiation hardening in F82H-ODS steel

被引：16

作者：

Chen, S. ^{[1
]}

Wang, Y. ^{[1
]}

Tadaki, K. ^{[1
]}

Hashimoto, N. ^{[1
]}

Ohnuki, S. ^{[1
]}

机构：

[1] Hokkaido Univ, Grad Sch Engn, Sapporo, Hokkaido 0608278, Japan

来源：

JOURNAL OF NUCLEAR MATERIALS | 2014年 / 455卷 / 1-3期

关键词：

STRENGTHENED FERRITIC STEELS; STAINLESS-STEEL; DISLOCATION; HARDNESS; BUBBLE; METALS; ALLOY;

D O I：

10.1016/j.jnucmat.2014.06.041

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Helium implantation was performed to investigate irradiation hardening in ferritic/martensitic steels. Depth dependence of nano-hardness was obtained using a Berkovich nano-indenter, and then nano-hardness was extracted from Nix-Gao model. The correlation between irradiation hardening and the concentration 500-2000 appm of helium was plotted. Nano-hardness increases as a function of helium concentration. F82H-ODS with a higher nano-hardness provides a lower irradiation hardening than F82H-IEA. Cross-sectional transmission electron microscopy (XTEM) revealed that cavities with a uniform distribution were formed after helium implantation at 2000 appm helium concentration, showing a mean size of 1.1 nm with an average number density of 4.9 x 10(23) m(-3) in F82H-IEA and 1.3 nm with 7.4 x 10(23) m(-3) in F82H-ODS. Orowan model was applied to evaluate the hardening from dispersed cavities. The significant difference of hardening between calculation and nano-indentation result of F82H-ODS indicates that oxide particles may shield the hardening effect from cavities because of the complex multi-interaction. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：301 / 305

页数：5

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