Abstract
Pipeline steel is used to make long pipes transporting fossil oil and natural gas, and the stability of its fatigue life is important to evaluate the pipeline service reliability. However, a fatigue life scatter often occurs at low stress amplitudes in X80 pipeline steel. In this investigation, the possible influencing factors have been studied with observation on the fatigue fracture morphology, microstructure and dislocation pattern, and analysis on the distribution of micro-Vickers hardness. It is found that the remaining transverse machining marks greatly affects the fatigue lives at low stress amplitudes. It is mainly because the critical threshold stress factor is greatly influenced by the depth of transverse machining mark. Removing the remaining transverse marks totally as much as possible can greatly improve the fatigue life scatter.
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