砷对海洋平台用Q345E钢低温韧性的影响  

Effect of arsenic on low temperature toughness of offshore platform steel Q345E

作　　者：王中学[1,2] 宋成浩 于浩[1] 周海龙[1] 王统[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]莱芜钢铁集团有限公司,山东莱芜271104

出　　处：《材料热处理学报》2015年第10期156-162,共7页Transactions of Materials and Heat Treatment

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%.

关 键 词：偏聚 激光拉曼 低温韧性 电子背散射衍射 透射电镜 

分 类 号：TG142.1[一般工业技术—材料科学与工程]