600℃塑性形变对SIMP钢在液态铅铋中腐蚀行为的影响及机理  

Effect of 600℃ Plastic Deformation on Corrosion Behavior of SIMP Steel in Liquid Lead-bismuth and Its Mechanism

作　　者：段志国 姚存峰[2] 刘德学[1] 张宏鹏[2] 赵力 秦畅 DUAN Zhiguo;YAO Cunfeng;LIU Dexue;ZHANG Hongpeng;ZHAO Li;QIN Chang(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730000,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;School of Nuclear Science and Engineering,North China Electric Power University,Beijing 100000,China)

机构地区：[1]兰州理工大学材料科学与工程学院,兰州730000 [2]中国科学院近代物理研究所,兰州730000 [3]华北电力大学核科学与工程学院,北京102206

出　　处：《原子核物理评论》2024年第4期1058-1065,共8页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(U2032142)。

摘　　要：结构材料应用在铅冷快堆中不可避免会发生塑性形变,因此认识和理解塑性变形对结构材料腐蚀行为的影响具有重要的意义。本工作研究不同轧制变形量的SIMP钢在550℃、液态LBE中的腐蚀行为,探究轧制塑性变形对SIMP钢抗LBE腐蚀性的影响。研究发现,在腐蚀前期轧制样品比原始样品表现出更高的氧化速率,这是由于轧制产生的晶界和位错会促进原子的扩散,进而加速了氧化层的生长;在腐蚀后期,随着富Cr、Si氧化物的形成,Fe和O元素的扩散被抑制。因而,相对未变形的样品,轧制样品表现出低氧化速率。Structural materials applied in lead-cooled fast reactors will inevitably undergo plastic deformation,so it is important to recognize and understand the influence of plastic deformation on the corrosion behavior of structural materials.In this work,the corrosion behavior of SIMP steels with different rolling deformations in liquid LBE at 550℃ was investigated.It was found that the rolled samples exhibited higher oxidation rates than the original samples during the pre-corrosion period,due to the fact that the grain boundaries and dislocations created by rolling promote the diffusion of atoms,which in turn accelerates the growth of the oxide layer.In the late stage of corrosion,the diffusion of Fe and O elements is inhibited due to the formation of Cr and Si-rich oxides.As a result,the rolled samples exhibit low oxidation rates relative to the original samples.

关 键 词：铅铋共晶 SIMP钢 塑性变形 腐蚀 氧化层 

分 类 号：TL341[核科学技术—核技术及应用]