摘要
利用二次离子质谱、激光拉曼、电子背散射衍射及透射电镜等仪器,观察并研究了海洋平台用含砷热轧H型钢低温韧性的影响因素,并提出相应的控制技术。结果表明,显微组织、夹杂物和亚微米结构等都不是影响低温韧性的主要因素;发现了砷在晶界偏聚,晶界上As含量约为基体的10倍。采用本文生产线及生产工艺,分析不同的As含量对热轧H型钢冲击功的影响,结果表明钢中As含量控制在0.015%以下不会影响其低温韧性。
Low temperature toughness of a offshore platform steel Q345 E containing arsenic was investigated by secondary ion mass spectroscopy（ SIMS）,laser Raman,EBSD technique and TEM. The results show that microstructure,inclusion and sub-microstructure have no effect on the low temperature toughness of the tested steel. It is founded that the content of arsenic segregated at grain boundaries is 10 times of that of the matrix by TEM observation for the steel containing 0. 036% As,which deteriorates its low temperature toughness.Based on the experiments,the effect of arsenic content on the impact energy of the hot-rolled Q345 E steel H-beam was analyzed. It shows that it has no influence on the low temperature toughness when the content of arsenic is controlled below 0. 015%.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第10期156-162,共7页
Transactions of Materials and Heat Treatment
关键词
偏聚
激光拉曼
低温韧性
电子背散射衍射
透射电镜
segregation
laser raman
low temperature toughness
electron backscattered diffraction
transmission electron microscope
