摘要
依据NACE TM 0284-2011标准评估了不同显微组织X100管线钢的氢致开裂(HIC)敏感性,采用场发射扫描电镜、氢显等手段观察了钢中HIC裂纹的萌生和扩展以及H的聚集,借助于氢渗透动力学参数分析了X100管线钢不同显微组织试样的氢捕获效率与HIC敏感性的内在关联。结果表明,具有不同显微组织的X100管线钢HIC敏感性依次为:原始铁素体-贝氏体组织试样>炉冷处理的块状铁素体组织试样>风冷处理的针状铁素体组织试样;钢中组织对氢的捕获效率越高,钢材对HIC敏感性越大;H原子容易在夹杂物和基体之间的界面处聚集,钢中的MnS夹杂、Ca-Al-Si-O复合夹杂和MnO夹杂均为HIC裂纹萌生源。
The hydrogen induced cracking(HIC) sensitivity of X100 pipeline steels with different microstructures was evaluated according to the NACE TM 0284-2011 standard. While, the initiation and propagation of HIC, and the aggregation of hydrogen atoms in the steel were characterized via field emission scanning electron microscopy(FE-SEM) and hydrogen microprint technique. The relationship between hydrogen trapping efficiency and HIC sensitivity of X100 pipeline steels with different microstructure was analyzed by using kinetic parameters of hydrogen permeation. The results show that the HIC susceptibility of X100 pipeline steels with different microstructure could be ranked as follows: original specimen with ferrite-bainite microstructure>furnace-cooling specimen with massive ferrite microstructure>wind-cooling specimen with acicular ferrite microstructure. The microstructure has higher trapping efficiency, the more susceptible to HIC is. Hydrogen atoms tend to aggregate at the interface between inclusion and matrix, and the HIC could initiate at MnS inclusion, Ca-Al-Si-O composite inclusion and MnO inclusion in the steels.
作者
袁玮
黄峰
甘丽君
戈方宇
刘静
YUAN Wei;HUANG Feng;GAN Lijun;GE Fangyu;LIU Jing(State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2019年第6期536-542,共7页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金(51871172)。
关键词
X100管线钢
组织
HIC敏感性
氢捕获
X100 pipeline steel
microstructure
HIC susceptibility
hydrogen trapping
