Study on the effect of Si content on the compatibility of F/M steels with lead-bismuth eutectic using small punch testing  

作　　者：Yajie He Lingzhi Chen Zhangshun Ruan Xiaogang Fu Bin Long 

机构地区：[1]Division of Reactor Engineering Technology Research,China Institute of Atomic Energy,Beijing,102413,China [2]China Nuclear Power Engineering Co.,Ltd,Beijing,102413,China

出　　处：《Materials Reports(Energy)》2024年第4期57-66,I0002,共11页材料导报（能源）（英文）

基　　金：supported by the National Natural Science Foundation of China(No.52301121).

摘　　要：This study investigates the impact of silicon(Si)on the corrosion resistance and post-corrosion toughness of ferrite/martensitic(F/M)steels in a liquid lead-bismuth eutectic(LBE)environment.Corrosion tests were performed on HT-9 and EP-823(1.17 wt%Si)steels at 550℃for 1000 h under oxygen-controlled conditions.The resulting oxide layer consisted of an outer magnetite layer,a spinel layer and an inner oxide zone(IOZ).A Si-rich oxide layer was identified within the spinel and IOZ layers of EP-823,which slowed the growth rate of the oxide layer,enhanced antioxidant performance,and inhibited dissolution corrosion by the LBE.Post-corrosion mechanical properties were evaluated using a small punch test.Results showed a significant reduction in HT-9's toughness within 240 h of corrosion,while EP-823 exhibited increased brittleness after 500 h due to Si-promoted carbide and Laves phase precipitation,significantly reducing its toughness.

关 键 词：Ferritic/martensitic steel SILICON Liquid lead-bismuth corrosion Small punch test Mechanical properties 

分 类 号：TG142[一般工业技术—材料科学与工程]