...Dongyang Li; Ming Liu; Linya Zhao; Yuyuan Guan; Lining Xu; Hui Ji; Duoer Shi; L.J. Qiao Inconel 625 for hydrogenation heat exchangers was studied to investigate its failure behavior in a hydrogen-containing environment. Hydrogen was introduced into Inconel 625, and the effect of hydrogen on pitting...

...Ming Liu; Guanghu Yao; Xuehan Wang; Lining Xu; Lang Jiao; Hang Su; Anqing Fu This study investigated the coupling effect of hydrogen and precipitates on the initiation of pitting using HR3C stainless steel with large NbCrN precipitates as the study material. Stainless steel exhibited good...

...Houwei Zhang; Qing Zheng; Dengyun Wang; Ming Liu; Gang Li; Lining Xu; Lijie Qiao This study simulates the behavior of 2205 duplex stainless steel (DSS) in an actual service environment under hydrogen charging/releasing cycles. Electrochemical and immersion experiments are conducted to compare...

..., was estimated from SSRTs and finite element modeling. Applying a cathodic potential suppressed trench formation, but not cracking, because cracks nucleated and propagated by hydrogen stress cracking. The resulting environmental and stress-level dependencies for Ni steels confirmed that trenches could...

.... Moreover, trenches’ morphology, dimensions, and distribution varied with the Ni content in the steels. For the steels studied in this work, the Ni effect on trenching persisted below the 1 wt% threshold. environmentally assisted cracking H₂S hydrogen low alloy steels nickel sulfide...

...Kazuyuki Shimizu; Hiroyuki Toda; Hiro Fujihara; Masatake Yamaguchi; Masayuki Uesugi; Akihisa Takeuchi; Masahiko Nishijima; Yasuhiro Kamada 7xxx aluminum alloys are representative high-strength aluminum alloys; however, mechanical property degradation due to hydrogen hinders further strengthening...

... of stress on IMPs leading to the microscale analysis of crack incubation is presented. Moreover, the contribution of hydrogen to the initiation of EAC remains a widely debated issue. Therefore, the second part of this paper more specifically reviews and summarizes the contribution of some specific local...

...Hans Husby; Inge Morten Kulbotten; Maria Sofia Hazarabedian; Mariano Iannuzzi A subsea fastener made of Alloy 716 (UNS N07716) experienced a brittle fracture in service. The investigations described herein suggested that the failure was caused by hydrogen stress cracking (HSC), thus, adding...

...Gayathri Sridhar; Nick Birbilis; V.S. Raja The fraction of pit dissolution charge (C_pit) that contributes to hydrogen evolution (HE) occurring within the metastable pits (analyzed in real-time) was determined to evaluate the error it introduces in the metastable pit size estimations...

...Daisuke Takazaki; Toshihiro Tsuchiyama; Ryosuke Komoda; Mohsen Dadfarnia; Brian P. Somerday; Petros Sofronis; Masanobu Kubota The objective of this study is to derive mechanistic insight into the degradation of metals in high-temperature hydrogen in order to enable the safety of evolving hydrogen...

... conducted for two FeCrAl alloys (APMT and C26M) in typical simulated boiling water reactor conditions at 288°C containing either dissolved hydrogen or oxygen. Crack propagation studies showed that both ferritic FeCrAl alloys were resistant to SCC at stress intensities below 40 MPa√m. Current results...

...Beate Pfretzschner; Thomas Schaupp; Axel Griesche Neutron cameras allow visualizing hydrogen distributions with radiographic or tomographic imaging methods in iron (and steel) and many other metals. The necessary contrast between hydrogen and these metals stems from the high difference in the total...

...Arnaud Metsue; Abdelali Oudriss; Xavier Feaugas The aim of this study is a clarification of the thermodynamic and/or kinetic origin of superabundant vacancies formation in nickel exposed to hydrogen ingress. Here, first-principles calculations within density functional theory have been conducted...

.... Only a small fraction of cracks would propagate deep into the steel. For X80 steel, with CP no higher than −776 mV, CP exhibited an inhibiting effect on both SCC crack initiation and propagation, and the inhibiting effect increased with CP level. For X100 steel, it was indicated that hydrogen effect...

...S. Thomas; G. Sundararajan; P.D. White; N. Birbilis The presence of absorbed hydrogen (H) within pure iron and most steels (including carbon and stainless steels) has been found to increase their corrosion. Historically, the enhanced corrosion of H-charged steels has been attributed to the ability...

... technique for investigating the layer structures of oxide films has been developed using this measurement method. The observed layer structures of the oxide films changed depending on the dissolved hydrogen concentration (DH) in PWR primary water. In two cases, where DH = 5 cm³/kg (H₂O...

...Traidia; A.M. El-Sherik; H. Attar The present work discusses the influence of specimen dimensions and boundary conditions on the deviation towards 2D diffusion during hydrogen permeation measurements on thick carbon steel plates. It was mathematically found and experimentally confirmed...

...A. Traidia; A.M. El-Sherik; S. Duval; G. Lubineau; J. El-Yagoubi NACE MR0175/ISO 15156-2 standard provides test conditions and acceptance criteria to evaluate the resistance of carbon and low-alloy steels to hydrogen-induced cracking (HIC). The second option proposed by this standard offers a large...

...B.W. Pan; J.X. Li; Y.J. Su; W.Y. Chu; L.J. Qiao The role of hydrogen and anodic dissolution in stress corrosion cracking (SCC) of API X-60 pipeline steel in soil containing water has been studied. The results show that the relative elongation reduction induced by hydrogen, I_HE, increases...

...F. Gui; T. Ramgopal; M.G. Muller Corrosion fatigue of C-Mn steels in sour environments is a concern in various offshore applications, particularly for flow-lines and risers. The commonly accepted mechanism of the enhanced fatigue crack growth rate (FCGR) behavior in these environments is hydrogen...