摘要
应用三维原子探针和纳米压痕技术研究了高温高注量质子初始辐照、辐照后退火及再辐照条件下核反应堆压力容器(RPV)钢中的微结构演变,及其与力学性能之间的关系。三维原子探针结果表明:初始辐照(1.6 dpa)条件下,RPV钢中产生了大量的富Mn-Ni-Si团簇;辐照后经500℃1 h退火处理,富Mn-Ni-Si团簇基本回复,但仍然存在少量包含Mn和Ni的稳态团簇;再辐照(0.1 dpa和1.6 dpa)时,RPV钢中又产生了新的富Mn-Ni-Si团簇,其数密度和平均尺寸随再辐照注量的增加而增加;初始辐照和再辐照的RPV钢中均未有富Cu原子团簇析出。纳米压痕结果表明初始辐照、辐照后退火和再辐照的RPV钢中均产生了明显的硬化现象。稳态团簇是退火后的RPV钢的硬度高于未辐照样品的硬度的主要原因。富Mn-Ni-Si团簇是高温高注量质子辐照国产低Cu含量RPV钢的一个硬化源。
Three-dimensional atomic probe tomography(3 D-APT)and nanoindentation techniques were used to study the evolution of microstructures and hardening property of high-dose initial proton-irradiated,post-irradiation annealed and re-irradiated reactor pressure vessel(RPV)steel under high temperature.The 3 D-APT results indicated Mn-Ni-Si-enriched clusters were produced in initial-irradiated(1.6 dpa)RPV steel.After post-irradiation annealed at 500℃for 1 h,some Mn-Ni-Si-enriched clusters recovered,but a small amount of stable clusters containing Mn and Ni still remained.The Mn-Ni-Si-enriched clusters were formed and their number density and average size increased with the increasing of re-irradiation dose up to 1.6 dpa.No Cu-enriched clusters were precipitated in initial and re-irradiated RPV steels.The nanoindentation results identified that the obvious hardening phenomena were found in the initial irradiated,post-irradiation annealed and re-irradiated RPV steels.The stable clusters were responsible for that the hardness of the post-irradiation annealed RPV steel was higher than that of the unirradiated sample.The Mn-Ni-Si-enriched cluster was an irradiation hardening source of highly irradiated Chinese-type low-Cu RPV steel.
作者
石见见
邹群
金旸
李良才
王兴刚
吴奕初
刘向兵
SHI Jianjian;ZOU Qun;JIN Yang;LI Liangcai;WANG Xinggang;WU Yichu;LIU Xiangbing(China Ship Development and Design Center,Wuhan of Hubei Prov.430064,China;School of Physics and Technology,Wuhan University,Wuhan of Hubei Prov.430072,China;Suzhou Nuclear Power Research Institute,Suzhou of Jiangsu Prov.215004,China)
出处
《核科学与工程》
CAS
CSCD
北大核心
2021年第5期1060-1066,共7页
Nuclear Science and Engineering
基金
国家自然科学基金项目(11675132)。
