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Solidification and re-melting mechanisms of SUS-B4C eutectic mixture
Journal of Nuclear Materials ( IF 2.8 ) Pub Date : 2020-09-13 , DOI: 10.1016/j.jnucmat.2020.152527
Takehiro Sumita , Toru Kitagaki , Masahide Takano , Atsushi Ikeda-Ohno

Fundamental understanding of the high-temperature interaction between stainless steel (SUS) and B4C is indispensable for estimating and characterizing the fuel debris generated during severe accidents of boiling water reactors (BWR), such as Fukushima Dai-ichi Nuclear Power Station (FDNPS, also referred to as “1F”) in Japan. This study aims at systematically characterizing the solidified products of molten SUS-B4C mixtures by powder X-ray diffraction (PXRD), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), and thermogravimetry-differential thermal analysis (TG-DTA) with a range of the B4C content relevant to the fuel debris composition expected at 1F, in order to elucidate the solidification and re-melting mechanisms. The results indicated that γ-Fe and (Cr,Fe)2B are the major solidified phases when the B4C content is below 3 mass%, while (Cr,Fe)23(C,B)6 is formed as an additional third phase when the B4C content exceeds 3 mass%. The solidification of molten SUS-B4C mixture and re-melting of solidified SUS-B4C melt are eutectic, which is mainly controlled by the pseudo-binary Fe–B system that is influenced by the C and Cr content and additional minor components such as Mo.



中文翻译:

SUS-B 4 C共晶混合物的凝固和重熔机理

对不锈钢(SUS)和B 4 C之间的高温相互作用的基本了解对于估算和表征在福岛第一核电站(FDNPS)等沸水堆(BWR)严重事故期间产生的燃料碎片至关重要。 ,在日本也称为“ 1F”)。这项研究旨在通过粉末X射线衍射(PXRD),扫描电子显微镜-能量色散X射线光谱(SEM-EDS)和热重分析-差示热分析系统地表征熔融SUS-B 4 C混合物的固化产物( TG-DTA),其范围为B 4为了阐明凝固和重熔机理,与预期在1F的燃料碎片成分有关的C含量。结果表明,γ-Fe和(铬,铁)2 B是主要固化的相当乙4 C的含量低于3质量%,而(铬,铁)23(C,B)6作为一个额外的形成当B 4 C的含量超过3质量%时为第三相。熔融的SUS-B 4 C混合物的凝固和凝固的SUS-B 4 C熔体的重熔是共晶的,这主要受拟二元Fe-B系统的控制,该系统受C和Cr含量以及其他微量元素的影响钼等成分

更新日期:2020-09-23
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