Electrochemical hydrogen charging to simulate hydrogen flaking in pressure vessel steels

Laureys, Aurélie; Stappen, Jeroen Van; Depover, Tom; Cnudde, Veerle; Verbeken, Kim

doi:10.1016/j.engfracmech.2019.106546

Cited by 9 publications

(10 citation statements)

References 27 publications

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“…Reprinted with permission from Ref. [9]. Figure 7: a) Deformed ULC steel hydrogen charged at 10 mA/cm² for 2 days; b) TRIP-assisted steel hydrogen charged at 10 mA/cm² for 3 days, c) Fe-C-Ti alloy hydrogen charged at 10 mA/cm² for 1 day, d) and f) pressure vessel steel material A and B, respectively, charged with hydrogen at 10 mA/cm² for 4 days.…”

Section: Resultsmentioning

confidence: 99%

“…Due to the strongly heterogeneous distribution of the micro-segregation areas in the materials, the precise quantification of the phase fractions could not be characterized in a reliable manner. After a qualitative study, it was clear that material A exhibited more tempered martensite in the segregated zones than material B [9].…”

Section: Methodsmentioning

confidence: 99%

“…In summary, crack nucleation during hydrogen charging has been related to a localized concentration and subsequent recombination of hydrogen at suitable heterogeneities such as grain boundaries, second phase particles, microvoids and tangled dislocations [38]. This investigation gives an overview of previous work [6,9,39,40] in order to bring together results obtained on different materials, compare the initiation mechanism for hydrogen induced cracking and as such give new insights on an important topic. The study compares the blistering behavior of four different types of materials, i.e.…”

Section: Introductionmentioning

confidence: 94%

“…HIC occurs, for instance, in oil and gas sour service pipelines where hydrogen ingress into steel from H 2 S occurs [7]. Also hydrogen flakes as found in reactor pressure vessels [8] are an example of HIC and could be artificially reproduced by intensive electrochemical hydrogen charging [9]. HIC occurs when the hydrogen concentration in the steel matrix exceeds a threshold hydrogen concentration.…”

Section: Introductionmentioning

confidence: 99%

“…The study compares the blistering behavior of four different types of materials, i.e. ultra low carbon (ULC) steel [6], TRIP (transformation induced plasticity)-assisted steel [40], generic Fe-C-Ti alloy [39], and pressure vessel steels [9]. These materials exhibit strongly varying microstructural features, such as different type of inclusions, precipitates and phases.…”

Section: Introductionmentioning

confidence: 99%

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Initiation of hydrogen induced cracks at secondary phase particles

Laureys

Pinson

Claeys

et al. 2020

Frattura Ed Integrità Strutturale

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The goal of this work is to propose a general mechanism for hydrogen induced crack initiation in steels based on a microstructural study of multiple steel grades. Four types of steels with strongly varying microstructures are studied for this purpose, i.e. ultra low carbon (ULC) steel, TRIP (transformation induced plasticity) steel, Fe-C-Ti generic alloy, and pressure vessel steel. A strong dependency of the initiation of hydrogen induced cracks on the microstructural features in the materials is observed. By use of SEM-EBSD characterization, initiation is found to always occur at the hard secondary phase particles in the materials.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%