材料工程2025，Vol.53Issue(10)：63-70,8.DOI:10.11868/j.issn.1001-4381.2023.000798
中子辐照后奥氏体不锈钢的焊接性研究进展
Research progress in weldability of austenitic stainless steel after neutron irradiation
尹少华 1陈英杰 2孙志强 3杨佳 3郭召生 2罗震3
作者信息
- 1. 天津大学 材料科学与工程学院,天津 300350||苏州热工研究院有限公司,江苏 苏州 215004
- 2. 中广核核电运营有限公司,广东 深圳 518124
- 3. 天津大学 材料科学与工程学院,天津 300350
- 折叠
摘要
Abstract
With the increasing service time of pressurized water reactor nuclear power plants,the weldability of austenitic stainless steel,used as a core structural material in reactors,gradually deteriorates due to neutron irradiation damage.Neutron irradiation leads to the formation of microstructural defects such as voids,helium bubbles,and dislocation loops within the material,where helium is generated through nuclear transmutation reactions involving boron(B)and nickel(Ni).During welding,helium diffuses and accumulates at grain boundaries,forming helium bubbles,and the tensile stress generated during post-weld cooling promotes the formation of helium induced cracks(HeIC).This paper reviews the irradiation damage mechanisms of austenitic stainless steel after neutron irradiation,focusing on the formation mechanism and influencing factors of HeIC.The threshold helium concentration of HeIC under different welding methods is analyzed,highlighting a significant relationship between welding heat input and the threshold helium concentration.Reducing heat input can effectively increase the threshold concentration.Furthermore,this paper summarizes two main methods to suppress helium-induced cracking:reducing welding heat input and minimizing welding tensile stress,and introduces advanced welding techniques such as auxiliary beam stress improvement laser welding.Finally,this paper emphasizes the need to focus on developing high-energy-density welding equipment and intelligent welding control technologies to address the challenges of welding repair for reactor internal components in nuclear power plants.关键词
中子辐照/氦致裂纹/奥氏体不锈钢/焊接性Key words
neutron irradiation/helium-induced crack/austenitic stainless steel/weldability分类
矿业与冶金引用本文复制引用
尹少华,陈英杰,孙志强,杨佳,郭召生,罗震..中子辐照后奥氏体不锈钢的焊接性研究进展[J].材料工程,2025,53(10):63-70,8.
