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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。
By means of LIBS-OPA-100 in-situ analyzer, scanning electron microscope (SEM) and transmission electron microscopy (TEM), the microstructure, hardness and segregation elements were studied. / A) Influence of Component on Hydrogen Induced Cracking Properties, Segregation and Hardness, and Segregation and Hydrogen Induced Cracking (HIC). The results show that the main reason for the unacceptable HIC resistance is that the C, Mn, S and Si elements in X65 pipeline steel segregate in the center to form the higher hardness. Particle size fractionation and large size phase precipitation are not conducive to anti-HIC performance. Band-like island organization is the site of hydrogen atoms, which is the source of hydrogen induced crack initiation and propagation.