Effects of internal hydrogen and surface-absorbed hydrogen on the hydrogen embrittlement of X80 pipeline steel. (23rd August 2019)

• Record Type: Journal Article
• Authors: Zhou, Chengshuang; Ye, Baoguo; Song, Yangyang; Cui, Tiancheng; Xu, Peng; Zhang, Lin
• Is Part Of: International journal of hydrogen energy. Volume 44:Number 40(2019)
• Page Start: 22547
• Page End: 22558
• Publication Date: 2019-08-23
• Subjects: Carbon steel -- Hydrogen embrittlement -- Internal hydrogen -- Surface-absorbed hydrogen -- Hydrogen permeation; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.04.239
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Effects of internal hydrogen and surface-absorbed hydrogen on hydrogen embrittlement (HE) of X80 pipeline steel were investigated by using different strain rate tensile test, annealing and hydrogen permeation tests. HE of X80 pipeline steel is affected by internal hydrogen and surface-absorbed hydrogen, and the latter plays a major role due to its higher effective hydrogen concentration. The HE susceptibility decreases with increasing the strain rate because it is more difficult for hydrogen to be captured by dislocations at the high strain rate. Annealing at 200 °C can weakened HE caused by internal hydrogen, while it has little effect on HE caused by surface-absorbed hydrogen. HE of X80 pipeline steel is mainly determined by the behavior of dislocation trapping hydrogen, which can be attributed to the interaction between hydrogen and dislocation. Highlights: Surface-absorbed hydrogen plays a major role in hydrogen embrittlement (HE). Annealing at 200 °C decreases HE caused by internal hydrogen. The capture of hydrogen by dislocation is the main factor for HE. The annealing pins mobile dislocations and increases yield strength. Interaction of dislocation and hydrogen atom induces HE.