The influence of microstructure on the trapping and diffusion of hydrogen in a low carbon steel

Luppo, M.I.; Ovejero-Garcı́a, J.

doi:10.1016/0010-938x(91)90097-9

Cited by 120 publications

(66 citation statements)

References 7 publications

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“…It will be interesting to examine the peculiarity of area and its influence on delayed fracture, for instance, heavy industrial region where air pollution level is high or coastal area in tropical region. 58,71) Electrochemical hydrogen permeation is an useful method to investigate hydrogen entry and diffusion in metals, [72][73][74][75][76][77][78][79][80][81] hydrogen traps, 81,82) and the method has been used to monitor hydrogen entry under outdoor exposure 34,38,83) and CCT 84) conditions. Omura et al have reported the correspondence between hydrogen permeation current at an exposure site and fracture ratio of exposure bolts.…”

Section: Ssrt After Outdoor Exposurementioning

confidence: 99%

Evaluation of Delayed Fracture Property of High Strength Bolt Steels

Akiyama

2012

ISIJ Int.

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Experimental studies attempting to evaluate the delayed fracture property of high strength bolt steels by using slow strain rate tests (SSRT) of circumferentially notched round bar specimens are reviewed in this paper. The relationship between the notch tensile strength (NTS) of the hydrogen-precharged specimens and the hydrogen content was approximated by power law relationship. It has been found that the local stress and the local diffusible hydrogen concentration control the occurrence of delayed fracture. To take into account the effect of hydrogen uptake from the environment, the notched bar specimens were subjected to cyclic corrosion test (CCT) and outdoor exposure, and their NTSs were measured using SSRT. The susceptibility of high strength steels to delayed fracture estimated from the decrease of NTS was correspondent to the fracture ratio of high strength bolts of the steels obtained by outdoor exposure tests, and was successfully evaluated with consideration of hydrogen uptake. Hydrogen entry behavior under CCT was monitored by electrochemical hydrogen permeation test, and continuous increase in hydrogen entry with growth of rust layer was observed. It is suggested that the "delay" of delayed fracture is the time required for the enhancement of the hydrogen entry efficiency.KEY WORDS: delayed fracture; hydrogen embrittlement; high strength steel; slow strain rate test; atmospheric corrosion; electrochemical hydrogen permeation; cyclic corrosion test; exposure test.

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Section: Ssrt After Outdoor Exposurementioning

confidence: 99%

Evaluation of Delayed Fracture Property of High Strength Bolt Steels

Akiyama

2012

ISIJ Int.

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“…In order to overcome hydrogen-related fracture through microstructure control, many attempts have been made to reveal the relationship between microstructure and hydrogen-related fracture. Most of such previous studies have investigated hydrogen trapping behavior, [1][2][3][4][5][6][7] critical hydrogen content for embrittlement, [8][9][10] and the relationship between microstructural change in tempering and susceptibility to hydrogen embrittlement. [11][12][13] In addition to such factors, it is important to characterize hydrogen-related crack propagation from a microstructural view-point in lath martensite.…”

Section: Introductionmentioning

confidence: 99%

Microstructural and Crystallographic Features of Hydrogen-related Crack Propagation in Low Carbon Martensitic Steel

2012

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This study investigated the characteristics of hydrogen-related crack propagation in low carbon lath martensite steel through orientation analysis using electron backscattering diffraction. The orientation analysis revealed that the hydrogen-related fracture surface consisted of the {011}M facets, which were also parallel to the block boundaries or lath boundaries in the lath martensite structure. In addition, micro-cracks were observed on or in the vicinity of the prior austenite grain boundaries. On the basis of the experimental results, we proposed that hydrogen enhanced local plastic deformation occurred in the vicinity of prior austenite grain boundaries. The mechanism of hydrogen-related fracture is characterized by the formation of micro-cracks around prior austenite grain boundaries and subsequent crack propagation along block boundaries or lath boundaries.

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“…It could be explained by the higher level of micro-allowing elements than those present on API X52 steel, which might form precipitations that act as strong traps. Luppo and Ovejero-Garcia [42] also reported similar results, affirming that the hydrogen diffusivity attains a minimum value in a fresh martensite because of the high density of lattice imperfections introduced by martensitic structure. Thus, it is confirmed that the martensitic transformation acts as traps for diffusing hydrogen atoms and consequently a decrease in diffusivity and hydrogen permeation flux.…”

Section: Quenched Base Metal (Qbm)mentioning

confidence: 55%

Effect of Microstructure on Hydrogen Diffusion in Weld and API X52 Pipeline Steel Base Metals under Cathodic Protection

Souza

Pereira

Starling

et al. 2017

International Journal of Corrosion

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The aim of this research was to evaluate the influence of microstructure on hydrogen permeation of weld and API X52 base metal under cathodic protection. The microstructures analyzed were of the API X52, as received, quenched, and annealed, and the welded zone. The test was performed in base metal (BM), quenched base metal (QBM), annealed base metal (ABM), and weld metal (WM). Hydrogen permeation flows were evaluated using electrochemical tests in a Devanathan cell. The potentiodynamic polarization curves were carried out to evaluate the corrosion resistance of each microstructure. All tests were carried out in synthetic soil solutions NS4 and NS4 + sodium thiosulfate at 25 ∘ C. The sodium thiosulfate was used to simulate sulfate reduction bacteria (SRB). Through polarization, assays established that the microstructure does not influence the corrosion resistance. The permeation tests showed that weld metal had lower hydrogen flow than base metal as received, quenched, and annealed.

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The influence of microstructure on the trapping and diffusion of hydrogen in a low carbon steel

Cited by 120 publications

References 7 publications

Evaluation of Delayed Fracture Property of High Strength Bolt Steels

Evaluation of Delayed Fracture Property of High Strength Bolt Steels

Microstructural and Crystallographic Features of Hydrogen-related Crack Propagation in Low Carbon Martensitic Steel

Effect of Microstructure on Hydrogen Diffusion in Weld and API X52 Pipeline Steel Base Metals under Cathodic Protection

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