重庆大学学报2024，Vol.47Issue(11)：104-111,8.DOI:10.11835/j.issn.1000-582X.2023.050
大厚度海上风电用钢的组织结构与低温冲击韧性
Microstructure and low-temperature impact toughness of large-thickness steel for offshore wind power
石莉 1龙杰 1庞辉勇 1林明新 1张海军 1吴涛1
作者信息
- 1. 舞阳钢铁有限责任公司,河南 平顶山 462500
- 折叠
摘要
Abstract
To address the issues of low impact energy and high variability in the core of 85 mm thick S355G10+N steel plates used in offshore wind power,the microstructure of steel plates with different thickness was investigated through metallographic examination,scanning electron microscope,and energy spectrum analysis,combined with theoretical calculations of inclusion formation.The results show that the microstructure of the steel is predominantly granular bainite,with minor amounts of ferrite and pearlite.While the surface and the 1/4 thickness region of the plate exhibit homogeneity,significant segregation and lath bainite are observed in the core.Impact fracture morphology shows that MnS and(Nb,Ti)C inclusions generated by center segregation act as fracture initiation points,with intergranular fracture occurring around these inclusions.The presence of lath bainite in the center segregation zone increases crack propagation,and the combined effect of inclusions and lath bainite significantly reduces the impact toughness of the steel plate core.关键词
S355G10+N/冲击韧性/沿晶断裂/夹杂物Key words
S355G10+N/impact toughness/intergranular fracture/inclusion分类
交通工程引用本文复制引用
石莉,龙杰,庞辉勇,林明新,张海军,吴涛..大厚度海上风电用钢的组织结构与低温冲击韧性[J].重庆大学学报,2024,47(11):104-111,8.
