管线钢土壤应力腐蚀开裂研究进展及展望

Research Progress and Prospect of Stress Corrosion Cracking of Pipeline Steel in Soil Environments

综述了埋地管线钢在管道外部环境中开裂机理的研究进展,总结了材料因素(合金元素、显微组织、夹杂物)、环境因素(外加电位、pH、温度、侵蚀性离子)和应力因素(残余应力、载荷类型、应变速率)对管线钢SCC行为和机理的影响规律,梳理了两类典型pH SCC机理的形成过程,讨论了经典裂纹扩展速率预测模型的先进性和局限性,最后针对研究存在的不足展望了埋地管线钢SCC未来的研究方向。

In this article,the research progress of the cracking mechanism of buried pipelines steel in external environment of the pipeline was firstly introduced.Then,the effect of various factors such as the material factors(alloying elements,microstructure,inclusions),environmental factors(applied potential,pH,temperature,corrosive ions),and stress factors(residual stress,load type,strain rate)on the SCC behavior and mechanism of pipeline steel was summarized in detail.After that,the development history of the relevant mechanisms of the two type pH SCC,namely high pH-SCC and near-neutral pHSCC,have been in retrospect,it follows that the mechanism of the former is anodic dissolution(AD),but the latter is controlled by anodic dissolution and hydrogen embrittlement(AD+HE).Next,the advancement and limitations of the classical prediction model for cracks growth rate of SCC were discussed.Finally,the future research direction for SCC of buried pipelines is prospected in terms of the shortcomings related with the current research,therefore,it is expected to provide reference for the development of advanced SCC-resistant pipeline steel.