2020
DOI: 10.3390/ma13184188
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Effects of Alloying Elements (C, Mo) on Hydrogen Assisted Cracking Behaviors of A516-65 Steels in Sour Environments

Abstract: This study examined the effects of alloying elements (C, Mo) on hydrogen-induced cracking (HIC) and sulfide stress cracking (SSC) behaviors of A516-65 grade pressure vessel steel in sour environments. A range of experimental and analytical methods of HIC, SSC, electrochemical permeation, and immersion experiments were used. The steel with a higher C content had a larger fraction of banded pearlite, which acted as a reversible trap for hydrogen, and slower diffusion kinetics of hydrogen was obtained. In additio… Show more

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Cited by 13 publications
(6 citation statements)
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“…Figure 1 shows the macrostructure, microstructure, and hardness profile of the two welded steel samples. The major differences between the two BMs of the two samples lie in the banding index of pearlite and the level of the 2nd phase particles, which was reported previously [ 20 ], but they were not the focus of the present study. Under the same welding conditions and consumables, however, there was no significant difference in the macro- and microstructures of weldments of the two samples.…”
Section: Resultsmentioning
confidence: 71%
See 1 more Smart Citation
“…Figure 1 shows the macrostructure, microstructure, and hardness profile of the two welded steel samples. The major differences between the two BMs of the two samples lie in the banding index of pearlite and the level of the 2nd phase particles, which was reported previously [ 20 ], but they were not the focus of the present study. Under the same welding conditions and consumables, however, there was no significant difference in the macro- and microstructures of weldments of the two samples.…”
Section: Resultsmentioning
confidence: 71%
“…Figure 2 presents the ultrasonically detected HICs of the unwelded and welded steel samples, which had been immersed in a NACE solution saturated with H 2 S. The differences in the HIC sensitivity ( Table 3 ) between the two unwelded samples are discussed elsewhere [ 20 ]. The focus here was on the changes in the HIC levels and distributions after welding the steel samples.…”
Section: Resultsmentioning
confidence: 99%
“…Besides, crevice corrosion may occur at the boundary due to the presence of coating. Therefore, similar to the experiments using H2S to generate HIC, there are still three AE sources during the electrochemical tests which are from H2 bubbles, corrosions and HIC [13]. In order to better distinguish these 3 kinds of signals, three different tests were designed whose information are summarized in Table 2.…”
Section: Ferrit Ementioning
confidence: 99%
“…Du et al [12] completed the hydrogen charging of A537 steel plates using Devanathan's double-electrolytic cell with the electrolyte as 0.2 mol/L NaOH and 0.25 g/L As2O3 and calculated the effective hydrogen diffusivity. Park et al [13] evaluated the effects of alloying elements (C, Mo) on hydrogen diffution behaviours using the electrochemical permeation experiments, using NACE + 0.05 M Na2S + 0.3 wt.% NH4SCN with constant cathodic current density of 1 mA/cm 2 . These studies show that the electrochemical hydrogen charging can be used as an effective method for rapid assessment of susceptibility to HIC of steels.…”
Section: Introductionmentioning
confidence: 99%
“…In addition, in all reported tests, it took a long time to produce HIC, typically from 4 days to several weeks, which is a major drawback for laboratory tests. In the present study, the electrochemical hydrogen-charging method was chosen to verify that HIC can be generated in an accelerated approach [ 13 ].…”
Section: Introductionmentioning
confidence: 99%