Effect of hydrogen on the fracture behavior of high strength steel during slow strain rate test

Wang, Maoqiu; Akiyama, Eiji; Tsuzaki, Kaneaki

doi:10.1016/j.corsci.2007.03.038

Cited by 354 publications

(168 citation statements)

References 24 publications

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“…Hot extraction experiments were performed using a G8 Galileo with Thermal Conductivity Detector (TCD) from Bruker (Bruker, Karlsruhe, Germany) at 300 • C to determine the amount of diffusible hydrogen, according to the definition for diffusible hydrogen, as proposed by Wang et al [22], and frequently applied since [23]. After extracting the samples from the vessel, they were stored in liquid nitrogen to minimise the loss of hydrogen.…”

Section: Methodsmentioning

confidence: 99%

FeS Corrosion Products Formation and Hydrogen Uptake in a Sour Environment for Quenched & Tempered Steel

Wallaert

Depover

Graeve

et al. 2018

Metals

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Surface corrosion product formation is one of the important factors affecting the corrosion rate and hydrogen uptake in a H 2 S environment. However, it is still unclear how the base material composition will affect the corrosion products that are generated, and consequently their impact on the corrosion rate. In this paper, corrosion product formation and the impact of the Mo content of the base material on the composition of the corrosion products and hydrogen absorption in a sour environment was investigated. The corrosion layer was composed of a double layered mackinawite (FeS 1−x ) structure, which was enriched with molybdenum and chromium. The layers were formed via two different mechanisms, i.e., the inner layer was created via a general oxide film formation corrosion mechanism, whereas the upper layer was formed by a precipitation mechanism. The presence of this double corrosion layer had a large influence on the amount of diffusible hydrogen in the materials. This amount decreased as a function of contact time with the H 2 S saturated solution, while the corrosion rate of the materials shows no significant reduction. Therefore, the corrosion products are assumed to act as a physical barrier against hydrogen uptake. Mo addition caused a decrease in the maximal amount of diffusible hydrogen.

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Section: Methodsmentioning

confidence: 99%

FeS Corrosion Products Formation and Hydrogen Uptake in a Sour Environment for Quenched & Tempered Steel

Wallaert

Depover

Graeve

et al. 2018

Metals

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“…[44][45][46][47][48][49]65) Slow strain rate test (SSRT) was performed using CNRB- The maximum value of HE measured after SSRT of exposed notched bar specimens was used as HE of B15, B13 and A13. The maximum HE of exposed bolt was used as HE of A11.…”

Section: B15 > B13 > A13 > A11mentioning

confidence: 99%

“…41) They also obtained critical NTS for delayed fracture by increasing applied stress in stepwise manner to obtain shape parameter in Weibull stress for evaluation of delayed fracture. 42 43) and the present authors [44][45][46][47][48][49] carried out slow strain rate test (SSRT) of hydrogen-precharged CNRBSs, and obtained the relationship between NTS and hydrogen content. For convenience and simplification, Hagihara et al proposed Conventional Strain Rate Test (CSRT) with a strain rate which is 2 orders of magnitude higher than that of SSRT.…”

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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“…Recently, susceptibility to delayed fracture is evaluated by Slow Strain Rate Test (SSRT) [6][7][8][9][10][11][12] and Conventional Strain Rate Test (CSRT) [13][14][15][16] which can complete the delayed fracture test in a shorter time than CLT. The relationship between H C and fracture stress can be obtained by SSRT and CSRT.…”

Section: )mentioning

confidence: 99%

Comparison of Constant Load, SSRT and CSRT Methods for Hydrogen Embrittlement Evaluation Using Round Bar Specimens of High Strength Steels

et al. 2016

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Resistance to hydrogen embrittlement of low alloy steels was evaluated based on their critical hydrogen content and critical stress. Constant load test (CLT), Slow Strain Rate Test (SSRT) and Conventional Strain Rate Test (CSRT) were carried out using JIS-SCM435 and V-added steels in six laboratories. It was confirmed that the same test results were obtained in different laboratories under the same test conditions. Furthermore, the relationships between diffusible hydrogen content and nominal fracture stress obtained by means of CLT and SSRT were similar to each other. In CSRT, the nominal fracture stress was higher than that in CLT and SSRT under the same absorbed hydrogen content in the specimens. In SSRT and CSRT, fracture surfaces showed Quasi-cleavage mode under small hydrogen content, while they showed Inter-granular fracture under large hydrogen content. In order to compare the three methods considering the concentration of hydrogen in stress field, locally accumulated hydrogen content under the same fracture stress is calculated. The locally accumulated hydrogen under the same applied stress, in other words, critical hydrogen content to hydrogen embrittlement, is the following order; SSRT < CLT < CSRT in JIS-SCM435, and CSRT < CLT ≒ SSRT in V-added steels.

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Effect of hydrogen on the fracture behavior of high strength steel during slow strain rate test

Cited by 354 publications

References 24 publications

FeS Corrosion Products Formation and Hydrogen Uptake in a Sour Environment for Quenched & Tempered Steel

FeS Corrosion Products Formation and Hydrogen Uptake in a Sour Environment for Quenched & Tempered Steel

Evaluation of Delayed Fracture Property of High Strength Bolt Steels

Comparison of Constant Load, SSRT and CSRT Methods for Hydrogen Embrittlement Evaluation Using Round Bar Specimens of High Strength Steels

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