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.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
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)
