Helium-implantation Induced Hardening of Two Low-activation Ferritic/Martensitic Steels of China
-
摘要: 低活化的铁素体/马氏体钢（RAFM）以其高导热率、低热膨胀率、高抗辐照肿胀能力成为未来核聚变堆重要的候选结构材料，在聚变堆高能中子辐照环境由于（n，α）核反应产生的高浓度He在材料中的积累对于材料微观结构和宏观性能的影响是关系这类材料服役寿命的重要问题。本工作研究了面向聚变反应堆应用的两种国产低活化钢（CLF、CNS）的辐照硬化效应，利用中国科学院近代物理研究所320 kV高压实验平台提供的4He离子束进行辐照实验，辐照剂量6×10-3，6×10-2，6×10-1 dpa （辐照损伤/原子平均离位），对应注He浓度分别为100，1 000，10 000 appm （氦离子浓度/百万分之一）。采用多能注入方法，在样品表面至1微米深度形成He浓度和离位损伤的坪区分布。利用纳米压痕仪对参比样品和注入He的样品进行了连续刚度测试。基于NIX—GAO模型对纳米硬度数据进行分析，获得了注入He的区域样品纳米硬度的数据。研究表明，注入He区域的纳米硬度与辐照损伤水平之间存在着1/2次幂函数的关系。未辐照CLF钢比CNS钢的纳米硬度略低，随着辐照剂量的增加，CLF钢呈现的辐照硬化现象更明显。
Reduced activation ferritic/martensitic steels (RAFM) are important candidate materials for future fusion nuclear reactors because of their high thermal conductivity, low thermal expansion rate and high resistance to irradiation swelling performance. The influence of high concentration helium produced by nuclear reaction (n,α) on the micro-structure and macro-properties is an important issue limiting the service lifetime of the materials. In the present work, helium implantation to three different doses (100, 1 000, 10 000 appm helium, corresponding to 6×10-3, 6×10-2, 6×10-1 dpa) was carried out to investigate irradiation hardening of two RAFM Steels. Multi-energy He ion-beams at 320 kV high-voltage platform were used to get a damage plateau from surface to 1 μm depth in specimens. The continuous-stiffness test by a Nano-indentor G2000 was carried out Data of nano-hardness were analyzed based on Nix-Gao model. It is shown that there is a 1/2-power law relationship between the hardening and the irradiation damage level. Before helium implantation, the hardness of the CLF steel is slightly lower than that of the CNS steel. However, with the increase of helium-implantation dose, the hardening is more obvious in CLF steel. Further investigation of microstructures is needed to get a deeper understanding of the hardening mechanism.Abstract: Reduced activation ferritic/martensitic steels (RAFM) are important candidate materials for future fusion nuclear reactors because of their high thermal conductivity, low thermal expansion rate and high resistance to irradiation swelling performance. The influence of high concentration helium produced by nuclear reaction (n,α) on the micro-structure and macro-properties is an important issue limiting the service lifetime of the materials. In the present work, helium implantation to three different doses (100, 1 000, 10 000 appm helium, corresponding to 6×10-3, 6×10-2, 6×10-1 dpa) was carried out to investigate irradiation hardening of two RAFM Steels. Multi-energy He ion-beams at 320 kV high-voltage platform were used to get a damage plateau from surface to 1 μm depth in specimens. The continuous-stiffness test by a Nano-indentor G2000 was carried out Data of nano-hardness were analyzed based on Nix-Gao model. It is shown that there is a 1/2-power law relationship between the hardening and the irradiation damage level. Before helium implantation, the hardness of the CLF steel is slightly lower than that of the CNS steel. However, with the increase of helium-implantation dose, the hardening is more obvious in CLF steel. Further investigation of microstructures is needed to get a deeper understanding of the hardening mechanism.-
Key words:
- CLF /
- CNS /
- He-implantation /
- hardening /
- Nano-indentation
-
[1] KIMURA A, KASADA R, SUGANO R, et al. Journal of Nuclear Materials, 2000, 283: 827 [2] KURTZ R J, ALAMO A, LUCON E, et al. Journal of Nuclear Materials, 2009, 386: 411. [3] ODETTE G R, YAMAMOTO T, RATHBUN H J, et al.Journal of Nuclear Materials, 2003, 323(2): 313 [4] MURAKAMI S, MIYAZAKI A, MIZUNO M. Journal of Engineering Materials and Technology, 2000, 122(1): 60. [5] VAN DER Schaaf B, DIEGELE E, LAESSER R, et al. Fusion Engineering and Design, 2006, 81(8): 893. [6] KOHYAMA A, HISHINUMA A, KOHNO Y, et al. Fusion Engineering and Design, 1998, 41(1): 1. [7] WANG Pinghuai, YUJI N, TOMOAKI H, et al. Plasma Science and Technology, 2009, 11(2): 225. [8] YANG Ying, YAN Qingzhi, MA Rong, et al. Research Progress of CNS Series and Mod-Al-6XN nuclear steel[C]//Progress Report on China Nuclear Science＆Technology(Vol.2)-Section 4 of 2011 Annual Conference Proceedings of Chinese Nuclear Society (Nuclear Materials Sub-volume, Isotope Separation Sub-volume, Nuclear and Radiochemistry Sub-volumes), 2011. (in Chinese)(杨英, 燕青芝, 马荣, 等. CNS系列及Mod-AL-6XN核材料用钢研究进展[C]// 中国核科学技术进展报告(第二卷)||中国核学会, 2011年学术年会论文集第4册(核材料分卷, 同位素分离分卷,核化学与放射化学分卷), 2011.) [9] LI Xinggang, YAN Qingzhi, MA Rong, et al. Journal of Iron and Steel Research, International, 2010, 17(5): 57. [10] YANG Yitao, ZHANG Chonghong, MENG Yancheng, et al.Journal of Nuclear Materials, 2015, 459: 1. [11] Sun Yuli, ZuoDunwen, Zhu Yongwei, et al. Journal of the Chinese Ceramic Society, 2007, 35(11): 1484.(in Chinese)(孙玉利, 左敦稳, 朱永伟, 等. 硅酸盐学报, 2007, 35(11): 1484.) [12] HEINTZE C, BERGNER F, HERNÁNDEZ-MAYORAL M.Journal of Nuclear Materials, 2011, 417(1): 980. [13] NIX W D, GAO H. Journal of the Mechanics and Physics of Solids, 1998, 46(3): 411. [14] WEI O J, GAGANIDZE E, AKTAA J. Journal of Nuclear Materials, 2012, 426(1): 52. [15] HUNN J D, LEE E H, BYUN T S, et al. Journal of Nuclear Materials, 2000, 282(2): 131. [16] BYUN T S, FARRELL K, LEE E H, et al. Journal of Nuclear Materials, 2001, 298(3): 269. [17] KLIMENKOV M, MATERNA-MORRIS E, MOSLANG A.Journal of Nuclear Materials, 2011, 417(1): 124. -
点击查看大图
计量
- 文章访问数: 1556
- HTML全文浏览量: 142
- PDF下载量: 160
- 被引次数: 0
下载:
甘公网安备 62010202000723号