Instability of MX and M23C6 type precipitates in F82H steels under 2.8 MeV Fe2+ irradiation at 673 K
Instability of MX and M23C6 type precipitates in F82H steels under 2.8 MeV Fe2+ irradiation at 673 K
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DOI：
10.1016/j.nme.2018.08.001
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发表时间：
2018-12
影响因子：
2.6
通讯作者：
S. Kano;Huilong Yang;Jingjie Shen;Zishou Zhao;J. McGrady;D. Hamaguchi;Mamami Ando;H. Tanigawa;H. Abe
中科院分区：
文献类型：
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作者：
S. Kano;Huilong Yang;Jingjie Shen;Zishou Zhao;J. McGrady;D. Hamaguchi;Mamami Ando;H. Tanigawa;H. Abe
本文研究了聚变DEMO堆包层主要候选结构材料F82 H钢中析出物对辐照的响应。分别选取含有F82 H-IEA钢的M23 C6型析出相和含有F82 H-BA 12钢的MX型和M23 C6型析出相作为实验样品。在673 K下使用离子加速器对两种钢进行了高达50 dpa的铁辐照。辐照后，沉淀物的不稳定行为，其特征在于使用透射电子显微镜。发现在F82 H-IEA样品中，在20 dpa下的辐射缺陷数密度为3.26 × 1021 m −3，并且在50 dpa下未检测到M23 C6的非晶化。虽然在M23 C6沉淀中发生了奥斯特瓦尔德熟化，但在本研究中，M23 C6的平均尺寸随着辐照剂量的增加而轻微减小。对于F_（82）H-BA_（12）试样，MX型和M_（23）C_6型析出相的收缩率分别为0.06和0.03 nm/dpa。因此，在本辐照条件下，F82 H钢中的MX和M23 C6型沉淀物表现出优异的耐辐照性。此外，两种样品中的M23 C6析出相均未出现非晶化和对比度减弱等不同于电子辐照的行为，这可能是由于损伤率不同等因素造成的。
The purpose of this study is to investigate the response of the precipitates against irradiation in F82H steels which are considered as main candidate structure material for the fusion DEMO reactor blanket. M23C6-type precipitates contained F82H-IEA steel, and MX- and M23C6-type precipitates contained F82H-BA12 steel were selected as experimental specimens. Iron irradiation at 673 K using ion accelerator was performed on both steels up to 50 dpa. After irradiation, the instability behavior of precipitates was characterized using transmission electron microscopy. It is found that in F82H-IEA specimens, the number density of radiation defects at 20 dpa was 3.26 × 1021m−3, and the amorphization of M23C6was undetected up to 50 dpa. Although Ostwald ripening occurred in M23C6precipitates, the average size of M23C6mildly decreased with irradiation dose within this study. For F82H-BA12 specimens, the shrinkage rate of MX- and M23C6-type precipitates was estimated respectively as 0.06 and 0.03 nm/dpa. Hence, the MX and M23C6-type precipitates in F82H steel exhibit an excellent irradiation resistance under the present irradiation condition. Moreover, the behaviors like amorphization and weakening in contrast were not observed in M23C6precipitates in both specimens, which is different from electron irradiation, presumably due to the factors such as different damage rate.