Der Einfluß der Umgebung auf die Rißzähigkeit und Rißausbreitung bei höherfesten Stählen

Küster, F. W.; Bohnenkamp, Konrad; Engell, Hans‐Jürgen

doi:10.1002/maco.19780291203

Cited by 12 publications

(2 citation statements)

References 5 publications

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“…13) Therefore, factors corresponding to delayed fracture property such as critical stress for delayed fracture, fracture time and KISCC were evaluated as a function of, for instance, baking time after hydrogen charging, 14) hydrogen pressure, 15,16) potential 17) and current density 18) of electrochemical hydrogen charging. Though the mechanism of delayed fracture is not clarified, yet, and the direct influence of diffusible hydrogen content on delayed fracture is still controversial [19][20][21] in spite of the extensive studies of delayed fracture, 19,[22][23][24][25][26][27] critical diffusible hydrogen content for delayed fracture, HC, has been proposed as a parameter to evaluate the susceptibility to delayed fracture [28][29][30][31] according to the recent progress of quantitative measurement of hydrogen content in steels.…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

Evaluation of Delayed Fracture Property of High Strength Bolt Steels

Akiyama

2012

ISIJ Int.

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“…In fracture mechanics investigations, too, it has been observed that not only with cathodic polarisation but also with anodic polarisation hydrogen-induced fracture mechanisms exist [13]. Even at passive steels in aqueous alkaline solutions hydrogen evolution has been proved experimentally as the result of the cathodic partial reaction of the dissolution of passive iron [14].…”

Section: Introductionmentioning

confidence: 98%