偏析对X65管线钢抗氢致裂纹性能的影响

发布时间：2018-04-30 01:23

本文选题：X管线钢 + 偏析　；参考：《材料热处理学报》2015年04期

【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。
[Abstract]:By means of LIBS-OPA-100 in-situ analyzer, scanning electron microscope (SEM), transmission electron microscope (TEM) and so on, the effect of M-1 / A- component in central segregation zone of X65 pipeline steel on the properties of hydrogen-induced crack was studied from three aspects: microstructure, hardness and segregation element. The relationship between segregation and hardness and the relationship between segregation and hydrogen induced crack cracking (HIC). The results show that the formation of high hardness banded structure in the C _ (mn) Si element in the w _ X65 pipeline steel after central segregation is the main cause of the failure of the resistance to HIC, and the significant central segregation of Mayo Island, The precipitation of ferrite banded structure and large size phase particles is not conducive to the resistance to HIC, and the banded Mao island structure is the gathering place of hydrogen atoms, which is the source of the initiation and propagation of hydrogen-induced cracks.
【作者单位】：昆明理工大学材料科学与工程学院;钢铁研究总院工程用钢研究所;珠江钢管有限公司;
【基金】：国家科技支撑计划(2011BAE25B00,2011BAE25B03)
【分类号】：TG142.1

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