显微组织对X65-X70管线钢抗H2S性能的影响  

INFLUENCE OF MICROSTRUCTURE ON HIC-RESISTANCEIN H_2S CONTAINING SOLUTIONS OF HIGH STRENGTH PIPELINE STEEL X65～X70

作　　者：张雁[1] 蔡庆伍[1] 谢广宇[1] 

机构地区：[1]北京科技大学国家高效轧制工程中心,北京100083

出　　处：《腐蚀科学与防护技术》2007年第6期406-409,共4页Corrosion Science and Protection Technology

摘　　要：通过扫描电镜（SEM）、透射电镜（TEM）等方法，研究了X65-X70级别管线钢在饱和H2S溶液中的氢致开裂行为，及不同显微组织、位错与析出对氢致开裂（HIC）的作用。结果表明：组织均匀的珠光体／铁素体型X65管线钢和铁素体／针状铁素体型X70管线钢均具有良好的抗H2S腐蚀性能；带状组织是裂纹萌生和扩展的主要途径；合金元素的弥散析出作用可以提高管线钢的抗硫化氢腐蚀性能。This article focused on the effect of microstructure,especially the band structure to HIC-resist-ance of pipeline in H2S containing solutions with special attentions on the initiation and expansion of cracks. OM,SEM and TEM have been used to examine the dislocation and precipitation,which have sig-nificant effect on the hydrogen induced corrosion behavior of the steels. The results indicated that the X65 with a microstmcture of homogeneous pearlite/ferrite and the XTO with homogeneous ferrite/acicular-fer-rite showed optimal resistance to HIC and the band structure should be avoided.

关 键 词：管线钢 显微组织 带状组织 氢致开裂(HIC) 硫化氢(H2S) 

分 类 号：TG172.9[金属学及工艺—金属表面处理]