TEM Characterization of Helium Bubbles in T91 and MNHS Steels Implanted with 200 keV He Ions at Different Temperatures

Modified novel high silicon steel （MNHS, a newly developed reduced-activation martensitic alloy） and commercial alloy Tgl are implanted with 200 keV He2＋ ions to a dose of 5 × 1020 ions/m2 at 300, 450 and 560~C. Transmission electron microscopy （TEM） is used to characterize the size and morphology o...

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Published inChinese physics letters Vol. 32; no. 7; pp. 102 - 105
Main Author 王霁 高星 王志光 魏孔芳 姚存峰 崔明焕 孙建荣 李炳生 庞立龙 朱亚滨 骆鹏 常海龙 张宏鹏 朱卉平 王栋 杜洋洋 谢二庆
Format Journal Article
LanguageEnglish
Published 01.07.2015
Subjects
Alloy development
Alloy steels
Boundaries
Bubbles
Ferritic stainless steels
Precipitates
Silicon steels
Steels
T91钢
TEM表征
Transmission electron microscopy
原子俘获
氦泡
温度
电镜观测
离子
透射电子显微镜
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ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/32/7/076101

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Summary:Modified novel high silicon steel （MNHS, a newly developed reduced-activation martensitic alloy） and commercial alloy Tgl are implanted with 200 keV He2＋ ions to a dose of 5 × 1020 ions/m2 at 300, 450 and 560~C. Transmission electron microscopy （TEM） is used to characterize the size and morphology of He bubbles. With the increase of the implantation temperature, TEM observations indicate that bubbles increase in size and the proportion of ＇brick shaped＇ cuboid bubbles increases while the proportion of polyhedral bubbles decreases in both the steel samples. For the samples implanted at the same temperature, the average size of He bubbles in MNHS is smaller than that in T91. This might be due to the abundance of boundaries and precipitates in MNHS, which provide additional sites for the trapping of He atoms, thus reduce the susceptibility of MNHS to He embrittlement.
Bibliography:11-1959/O4
Modified novel high silicon steel （MNHS, a newly developed reduced-activation martensitic alloy） and commercial alloy Tgl are implanted with 200 keV He2＋ ions to a dose of 5 × 1020 ions/m2 at 300, 450 and 560~C. Transmission electron microscopy （TEM） is used to characterize the size and morphology of He bubbles. With the increase of the implantation temperature, TEM observations indicate that bubbles increase in size and the proportion of ＇brick shaped＇ cuboid bubbles increases while the proportion of polyhedral bubbles decreases in both the steel samples. For the samples implanted at the same temperature, the average size of He bubbles in MNHS is smaller than that in T91. This might be due to the abundance of boundaries and precipitates in MNHS, which provide additional sites for the trapping of He atoms, thus reduce the susceptibility of MNHS to He embrittlement.
WANG Ji, GAO Xing, WANG Zhi-Guang, WEI Kong-Fang, YAO Cun-Feng, CUI Ming-Huan, SUN Jian-Rong, LI Bing-Sheng, PANG Li-Long, ZHU Ya-Bin, LUO Peng, CHANG Hai-Long, ZHANG Hong-Peng, ZHU Hui-Ping, WANG Dong, DU Yang-Yang, XIE Er-Qing（ 1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 2 University of Chinese Academy of Sciences, Beijing 100049 3School of Physical Science and Technology, Lanzhou University, Lanzhou 730000）
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ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/32/7/076101