腐蚀疲劳是管线钢最为严重的破坏和失效形式之一。近年来，对管线钢腐蚀疲劳裂纹扩展行为，各种影响因素的物理机制，以及裂纹扩展速率模型的研究，已受到广泛的关注，也提出了不少新的研究方法和新理论，但在某些方面的理解仍不是十分清楚。目前应用较多的裂纹扩展速率模型大多是对线性叠加模型的修正，经试验验证，这些模型在各自特定的材料／环境体系的应用上是可靠的，但仍难以获得统一的公式，对于已提出的模型仍需完善。本工作对管线钢腐蚀疲劳裂纹扩展速率的部分重要的影响因素及其寿命预测模型的研究进展进行了总结，对新理论和新模型进行了探讨，提出了尚需解决的问题，对进一步的研究工作进行了展望。
Corrosion fatigue damage is one of the most serious fracture forms of oil and gas transmission pipeline steels, which can cause severe fracture and failure. Recently, the corrosion fatigue crack propagation behavior, mechanisms of several influencing factors and the modeling of the crack propagation rate have attracted much focus, and a number of new methods and theories have been proposed. However, the understanding in some aspects still remains controversial. The majority of the current crack propagation rate models, whose reliability was experimentally validated when they were applied to their specific materials/environment systems, are the amendment to the linear superposition model. By the modeling which could provide a theoretical support to the actual operation and protection of the pipelines, the life of pipeline steels could be predicted, and the effects of influencing factors could be quantified. In this article, the current research on some influencing factors and theoretical models of the crack propagation rate of pipeline steels is summarized and discussed, and the future research priorities and problems to be solved are prospected.
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