Effects of lamellar structure on tensile properties and resistance to hydrogen embrittlement of pearlitic steel

Yu, Sang Hyun; Lee, Sang Min; Lee, Suk Jin; Nam, Jae Hoon; Lee, Jae Seung; Bae, Chul Min; Lee, Young Kook

doi:10.1016/j.actamat.2019.04.040

Cited by 52 publications

(13 citation statements)

References 30 publications

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“…Amongst high-strength steels, as-drawn pearlitic steel wire have been reported to exhibit superior resistance against hydrogen embrittlement [6,48]. This was ascribed to the high density of H trapping sites in pearlitic steel associated to the high density of defects in the off-stoichiometric cementite [6], as well as possibly at interfaces between the ferrite and the cementite [49].…”

Section: Rationalising Pearlite's Resistance Against Hydrogen Embritt...mentioning

confidence: 99%

Solute hydrogen and deuterium observed at the near atomic scale in high-strength steel

et al. 2020

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Observing solute hydrogen (H) in matter is a formidable challenge, yet, enabling quantitative imaging of H at the atomic-scale is critical to understand its deleterious influence on the mechanical strength of many metallic alloys that has resulted in many catastrophic failures of engineering parts and structures. Here, we report on the APT analysis of hydrogen (H) and deuterium (D) within the nanostructure of an ultra-high strength steel with high resistance to hydrogen embrittlement. Cold drawn, severely deformed pearlitic steel wires (Fe-0.98C-0.31Mn-0.20Si-0.20Cr-0.01Cu-0.006P-0.007S wt.%, = 3.1) contains cementite decomposed during the pre-deformation of the alloy and ferrite. We find H and D within the decomposed cementite, and at some interfaces with the surrounding ferrite. To ascertain the origin of the H/D signal obtained in APT, we explored a series of experimental workflows including cryogenic specimen preparation and cryogenic-vacuum transfer from the preparation into a state-of-the-art atom probe. Our study points to the critical role of the preparation, i.e. the possible saturation of H-trapping sites during electrochemical polishing, how these can be alleviated by the use of an outgassing treatment, cryogenic preparation and transfer prior to charging. Accommodation of large amounts of H in the under-stoichiometric carbide likely explains the resistance of pearlite against hydrogen embrittlement.

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Section: Rationalising Pearlite's Resistance Against Hydrogen Embritt...mentioning

confidence: 99%

Solute hydrogen and deuterium observed at the near atomic scale in high-strength steel

et al. 2020

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“…The specimen was decorated with silver to observe its trapping behaviour and hydrogen distribution [21,22]. After polishing the specimen to a thickness of 800 µm using #2400 grit SiC paper on one side and a 0.06 µm diamond suspension on the other, specimens were charged with hydrogen from the #2400-polished side for 5 h. Then, a 2 mM K[Ag(CN) 2 ] silver decoration solution was dropped on the opposite side of the specimen at 20 • C for 10 min.…”

Section: Silver Decoration To Observe Hydrogen-trapping Behaviourmentioning

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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“…Pipeline steels generally contain a significant amount of pearlite, which is comprised of cementite and ferrite (Figure 1A and B). The interface of the two phases has generally been thought to be where hydrogen trapping and crack initiation take place, despite the high interfacial coherency (Figure 1C) [1,2]. However, there has been no direct observation of the distribution of hydrogen in the vicinity of these interfaces to support such hypothesis.…”

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confidence: 99%

Direct Observation of Hydrogen Distribution in Pearlite

Chen

Niu

Liu

et al. 2022

Microscopy and Microanalysis

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Effects of lamellar structure on tensile properties and resistance to hydrogen embrittlement of pearlitic steel

Cited by 52 publications

References 30 publications

Solute hydrogen and deuterium observed at the near atomic scale in high-strength steel

Solute hydrogen and deuterium observed at the near atomic scale in high-strength steel

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

Direct Observation of Hydrogen Distribution in Pearlite

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