Abstract The fatigue properties of the original, 1%, 2%, and 3% plastic pre-strained welded joints of X80 pipeline steels were tested to find the effect of plastic deformation on the service of pipelines. Results showed that the fatigue cracks growth period remarkably decreased with the increasing plastic pre-straining extent, reducing the safety of pipeline transportation. The decrease was caused by the cleavage fractures generated by dislocation synthesis reactions during the fatigue process. The results reveal the effects of dislocation distribution on fatigue property of the welded pipe after plastic deformation and provide a reference for the safety design of pipelines.

中文翻译：

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塑性预应变对X80 LSAW焊管焊接接头疲劳性能的影响

摘要 对X80管线钢原始、1%、2%和3%塑性预应变焊接接头的疲劳性能进行了测试，以研究塑性变形对管道使用的影响。结果表明，随着塑性预应变程度的增加，疲劳裂纹的增长期显着缩短，降低了管道运输的安全性。减少是由疲劳过程中位错合成反应产生的解理断裂引起的。研究结果揭示了位错分布对焊管塑性变形后疲劳性能的影响，为管道安全设计提供参考。