通过扫描电镜（SEM）和电子背散射衍射（EBSD）等方法，从组织结构和晶界2个方面，研究了微观组织对高强度管线钢氢致裂纹（HIC）的影响。结果表明：高强度管线钢组织结构中存在数量较多的、大块状的M/A岛时，会显著增加HIC的敏感性，而增加AF组织数量及其均匀性有利于降低HIC的敏感性；高强度管线钢的HIC裂纹沿着大角度晶界的边界扩展，而小角度晶界具有一定的止裂作用。
The influence of microstructure on hydrogen induced cracking (HIC) of high strength pipeline steel was studied through scanning electron microscopy (SEM),electron backscatter diffraction (EBSD) and other testing meth-ods from two aspects:organizational structure and grain boundary structure. The results indicate that high content and big block of M/A island will lead to obvious hydrogen induced cracking (HIC). Instead,the sensitivity of hydrogen induced cracking (HIC) will reduce through increasing the uniformity of organization. Furthermore,HIC of pipeline steel will grow along the large angle grain boundaries. On the contrary,HIC can be partly prevented on small-angle grain boundaries.
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