Effect of Prestrain on Hydrogen Embrittlement Susceptibility of EH 36 Steels Using In Situ Slow-Strain-Rate Testing

Park, Cheol-Ho; Kang, Ning; Liu, Stephen V.; Lee, Juseung; Chun, Eun−Joon; Yoo, Sun-Joon

doi:10.1007/s12540-018-00221-y

Cited by 33 publications

(5 citation statements)

References 36 publications

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“…The DIC results, shown in Figure 5, indicated that the local strain was concentrated in the softened HAZ of the carbon steel at the beginning of tensile testing, indicating the concentration of dislocations in the HAZ of the carbon steel. Because dislocations are important trapping sites for diffusible hydrogen, the content of the diffusible hydrogen increased in the HAZ of the carbon steel during the in situ SSRT [17,[40][41][42][43]. However, the HAZ of the carbon steel was mainly composed of polygonal ferrite, which did not interact with hydrogen; thus it avoided HSC.…”

Section: Effect Of Trapped Hydrogen On the Hsc Fracture Of The Wjsmentioning

confidence: 99%

Hydrogen Stress Cracking Behaviour in Dissimilar Welded Joints of Duplex Stainless Steel and Carbon Steel

Park

Moon

et al. 2021

Metals

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As the need for duplex stainless steel (DSS) increases, it is necessary to evaluate hydrogen stress cracking (HSC) in dissimilar welded joints (WJs) of DSS and carbon steel. This study aims to investigate the effect of the weld microstructure on the HSC behaviour of dissimilar gas-tungsten arc welds of DSS and carbon steel. In situ slow-strain rate testing (SSRT) with hydrogen charging was conducted for transverse WJs, which fractured in the softened heat-affected zone of the carbon steel under hydrogen-free conditions. However, HSC occurred at the martensite band and the interface of the austenite and martensite bands in the type-II boundary. The band acted as an HSC initiation site because of the presence of a large amount of trapped hydrogen and a high strain concentration during the SSRT with hydrogen charging. Even though some weld microstructures such as the austenite and martensite bands in type-II boundaries were harmless under normal hydrogen-free conditions, they had a negative effect in a hydrogen atmosphere, resulting in the premature rupture of the weld. Eventually, a premature fracture occurred during the in situ SSRT in the type-II boundary because of the hydrogen-enhanced strain-induced void (HESIV) and hydrogen-enhanced localised plasticity (HELP) mechanisms.

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Section: Effect Of Trapped Hydrogen On the Hsc Fracture Of The Wjsmentioning

confidence: 99%

Hydrogen Stress Cracking Behaviour in Dissimilar Welded Joints of Duplex Stainless Steel and Carbon Steel

Park

Moon

et al. 2021

Metals

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“…However, some reports have performed SSRT with in situ hydrogen charging. Park et al [ 13 ] conducted SSRT on EH 36 steel at a strain rate of 1 × 10 −5 s −1 . According to the results of the elongation loss and area reduction, the effect of the prestrain on the HE susceptibility and sensitivity was discussed.…”

Section: Introductionmentioning

confidence: 99%

Effect of Slow Strain Rates on the Hydrogen Migration and Different Crack Propagation Modes in Pipeline Steel

Peng

Cao

Huang

et al. 2023

steel research int.

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The slow‐strain‐rate test (SSRT) is the most commonly used method for evaluating pipeline steel in service environments. However, to accurately assess the sensitivity of steel to hydrogen, it is necessary to investigate the effect of different strain rates, taking into account microstructure‐influenced hydrogen migration. Herein, a hot‐rolled X70 pipeline steel sheet is investigated by a SSRT at different strain rates with and without synchronous hydrogen charging. The influence of the pearlite content and different strain rates on the hydrogen‐assisted crack propagation and hydrogen diffusion in pipeline steels is discussed. Using scanning electron microscopy, electron backscatter diffraction, transmission electron microscopy, and hydrogen microprinting, the hydrogen atoms are observed to be easily segregated at the ferrite/pearlite (F/P) interface without external stress. Under loading, a higher strain rate results in lower hydrogen permeation content in steel, penetrating into pearlite and interacting with its internal vacancies, leading to transgranular fracture initiating from pearlite. At a low strain rate, the F/P interface is more vulnerable to hydrogen degradation, leading to intergranular crack mode along the interface and increased tendency to form secondary cracks. Therefore, strain rate–induced crack initiation and propagation characteristics should be considered during the SSRT.

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“…The harmful impacts of HE are significant, as it severely affects most of the main alloy groups. High-strength steels [4,5], titanium alloys and aluminum alloys [6] are the most affected.…”

Section: Introductionmentioning

confidence: 99%

“…High-strength low-alloy (HSLA) steels have been widely used in oil and gas pipelines [5,7]. Pipelines are efficient, economic and can last for several decades [7].…”

Section: Introductionmentioning

confidence: 99%

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Traceability for measurements carried out on incremental step loading equipment

Júnior

Leal

Pires

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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The incremental step loading technique has been widely used for material hydrogen embrittlement characterization. However, due to numerous error sources that can affect the measurement results and to the current lack of standardization, users are facing difficulties in the evaluation of measurement uncertainty as well as in the metrological performance evaluation of incremental step loading equipment. The paper deals with evaluation of the metrological performance of equipment used to characterize the susceptibility of materials to hydrogen embrittlement through use of incremental step loading technique. Additionally, a procedure is developed to estimate the measurement uncertainty associated with the results obtained during the test. Two equipment configurations were verified. The first one, with a load cell of 20 kN, was used for test specimens with nominal dimensions of 30 mm, 30 mm and 200 mm in width, thickness and length, respectively; and the second, with a 1 kN load cell was used for test specimens with nominal dimensions of 10 mm × 10 mm × 60 mm. Three measurands were evaluated in each assemblage (force applied on the specimen, equipment arm positioning angle and stress). Several metrological parameters were estimated (bias, accuracy, expanded uncertainty, repeatability, maximum error, hysteresis and nonlinearity). The effectiveness of the proposed procedure for uncertainty assessment was tested by calculation of the uncertainty associated with lower value for fast fracture strength. From the obtained results, it was concluded that the two equipment configurations had excellent metrological properties, in both the loading and unloading phases. It was shown that the proposed procedure can properly estimate the uncertainty associated with measurement on incremental step loading testing. Considering the widely use of the incremental step loading technique, the results here presented can be particularly useful for ensuring the traceability of results to the International System of Units required by the ISO 17025 standard.

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Effect of Prestrain on Hydrogen Embrittlement Susceptibility of EH 36 Steels Using In Situ Slow-Strain-Rate Testing

Cited by 33 publications

References 36 publications

Hydrogen Stress Cracking Behaviour in Dissimilar Welded Joints of Duplex Stainless Steel and Carbon Steel

Hydrogen Stress Cracking Behaviour in Dissimilar Welded Joints of Duplex Stainless Steel and Carbon Steel

Effect of Slow Strain Rates on the Hydrogen Migration and Different Crack Propagation Modes in Pipeline Steel

Traceability for measurements carried out on incremental step loading equipment

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