坡口形状对CLAM钢焊缝抗辐照损伤性能的影响  

Effect of Groove Shape on Irradiation Damage Resistance of CLAM Steel Welds

作　　者：乔永丰 雷玉成[1] 姚奕强 朱强[1] QIAO Yongfeng;LEI Yucheng;YAO Yiqiang;ZHU Qiang(School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China;China Nuclear Power Technology Research Institute Co.,Ltd.,Shenzhen 518000,Guangdong,China)

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]中广核研究院有限公司,广东深圳518000

出　　处：《材料导报》2024年第10期128-135,共8页Materials Reports

基　　金：国家自然科学基金(51875264)。

摘　　要：为探究坡口形状对中国低活化马氏体(CLAM)钢焊缝辐照损伤性能及辐照硬化性能的影响,采用扫描电子显微镜(SEM)、原子力显微镜(AFM)、透射电子显微镜(TEM)、掠入射X射线衍射(GIXRD)和纳米压痕技术等方法,研究了在室温下经能量为70 keV、剂量为1×10^(17)ions/cm^(2)的He^(+)辐照后,V型、U型和双U型坡口CLAM钢焊缝的辐照损伤情况及力学性能。结果表明,离子辐照后,不同坡口形状焊缝金属中均产生了氦泡、析出物等缺陷,力学性能呈现出不同程度的降低。与V型和U型坡口焊缝相比,双U型坡口焊缝辐照后焊缝内部缺陷分布更均匀、尺寸更小。这是由于在三类焊缝中,双U型坡口焊缝热输入更小,焊缝晶粒组织相对较小,晶界密度更高。更高密度的晶界阻碍了缺陷间的相互聚集,减小了缺陷的尺寸。辐照后双U型坡口焊缝表面粗糙度最低,氦泡、析出物尺寸最小,衍射峰偏移量、宽化率最低,表面硬度最低,抗辐照硬化性能最好。这表明通过控制焊接坡口的形状,细化焊缝晶粒组织,可显著提升焊缝抗辐照损伤性能及抗辐照硬化性能。To investigate the effect of groove shape on theirradiation damage and hardening performance of Chinese low activation martensitic(CLAM)steel welds,scanning electron microscopy(SEM),atomic force microscopy(AFM),transmission electron microscopy(TEM),grazing incidence X-ray diffraction(GIXRD),and Nano-indentation technology were used to study the irradiation damage and mechanical properties of V-shaped,U-shaped,and double U-shaped CLAM steel welds after irradiation with He+at an energy of 70 keV to a dose of 1×10^(17) ions/cm ^(2) at room temperature.The results showed that after ion irradiation,defects such as helium bubbles and precipitates were generated in weld metals with different groove shapes,and the degree of reduction in mechanical performance varies.Compared with V-shaped and U-shaped groove welds,double U-shaped groove welds have a more uniform distribution and smaller sizes of internal defects after irradiation.This is because among the three types of welds,the double U-groove weld has a smaller heat input,a relatively smaller grain structure,and a higher grain boun-dary density.The higher density of grain boundaries hinders the mutual aggregation of defects,and reduces the size of defects.After irradiation,the surface roughness of the double U-shaped groove weld is the lowest,the size of helium bubbles and precipitates is the smallest,the diffraction peak offset and broadening rate are the lowest,the surface hardness is the lowest,and the irradiation hardening resistance is the best.This indicates that by controlling the shape of the welding groove and refining the grain structure of the weld,the irradiation damage resistance and irradiation hardening resistance of the weld can be significantly improved.

关 键 词：CLAM钢 焊接坡口 辐照损伤 辐照硬化 纳米压痕 

分 类 号：TG442[金属学及工艺—焊接]