偏析对X65管线钢抗氢致裂纹性能的影响  

Effect of segregation on hydrogen induced crack properties of X65 pipeline steel

作　　者：陈健[1,2] 汪兵[2] 胡亮 刘清友[2] 刘翔[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院工程用钢研究所,北京100081 [3]珠江钢管有限公司,广东番禺511450

出　　处：《材料热处理学报》2015年第4期126-132,共7页Transactions of Materials and Heat Treatment

基　　金：国家科技支撑计划(2011BAE25B00;2011BAE25B03)

摘　　要：通过LIBS-OPA-100原位分析仪、扫描电镜(SEM)、透射电子显微镜(TEM)等方法,从显微组织、硬度、偏析元素3方面研究了X65管线钢中心偏析带马奥岛(M/A)组元对氢致裂纹性能的影响,偏析与硬度以及偏析与氢致裂纹(HIC)之间的关系。结果表明:X65管线钢中C、Mn、S、Si元素在中心偏析后形成硬度较高的带状组织是导致抗HIC性能不合格的主要原因;显著的中心偏析马奥岛、铁素体带状组织和大尺寸的相颗粒析出不利于抗HIC性能;带状的马奥岛组织是氢原子的聚集场所,是导致氢致裂纹萌生与扩展的源头。The effect of microstructure M / A in center segregation band on hydrogen induced cracking( HIC) and the relationships between segregation and hardness of X65 pipeline steel were investigated by original position analyzer( LIBS-OPA-100),scanning electron microscopy( SEM) and transmission electron microscopy( TEM). The results show that banded structure of X65 pipeline steel with high hardness because of segregation of C,Mn,S,Si elements in center is the main reason for HIC. The microstructure of ferrite + M / A in segregation band and large precipitation phase both go against HIC resistance performance. M / A in segregation band is the source of initiation and propagation of HIC because hydrogen atoms are gathered here.

关 键 词：X65管线钢 偏析 硬度 氢致裂纹(HIC) 硫化氢(H2S) 

分 类 号：TG142.1[一般工业技术—材料科学与工程]