Suppression Mechanism of Strain-age-hardening in Carbon Steel Associated with Hydrogen Uptake

Ogawa, Taiji; Koyama, Motomichi; Noguchi, Hiroshi

doi:10.2355/isijinternational.isijint-2016-063

Cited by 5 publications

(4 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We measured F uy and F ly for all of the three beams under the two conditions. We obtained a reduction of the F uy from an average of ∼ 300 µN in air (H free) to an average of ∼ 260 µN for beams charged with H. The suppression of the F uy in the presence of the H atoms has been observed in conventional macroscopic tests as well [21,22]. According to Rogers [21], H attaches itself to the loops of dislocations that are freed from carbon or nitrogen by thermal fluctuations, lowering the energy and thereby the necessary stress for the formation of a critical-size loop.…”

Section: (B) Single Crystal Beammentioning

confidence: 60%

“…According to Rogers [21], H attaches itself to the loops of dislocations that are freed from carbon or nitrogen by thermal fluctuations, lowering the energy and thereby the necessary stress for the formation of a critical-size loop. On the other hand, Ogawa et al [22] attributed the effect to the H-enhanced local plasticity (HELP) mechanism and change in the distribution of the dislocations.…”

Section: (B) Single Crystal Beammentioning

confidence: 99%

See 1 more Smart Citation

Hydrogen enhanced cracking studies on Fe–3wt%Si single and bi-crystal microcantilevers

Hajilou¹,

Deng²,

Kheradmand³

et al. 2017

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

Hydrogen (H) enhanced cracking was studied in Fe-3wt%Si by means of electrochemical microcantilever bending test. It was clearly shown that the presence of H causes hydrogen embrittlement (HE) by triggering crack initiation and propagation at the notch where stress concentration is existing. Additionally, the effect of carbon content and the presence of a grain boundary (GB) in the cantilever were studied. It was shown that in the presence of H the effect of carbon atom on pinning the dislocations is reduced. On the other hand, the presence of a GB, while the chemical composition of material kept constant, will promote the HE. Crack initiation and propagation occur in the presence of H, while the notch blunting was observed for both single and bi-crystalline beams bent in air. Post-mortem analysis of the crack propagation path showed that a transition from transgranular fracture to intragranular fracture mechanism is highly dependent on the position of the stress concentration relative to the GB.This article is part of the themed issue 'The challenges of hydrogen and metals'.

show abstract

Section: (B) Single Crystal Beammentioning

confidence: 60%

Section: (B) Single Crystal Beammentioning

confidence: 99%

Hydrogen enhanced cracking studies on Fe–3wt%Si single and bi-crystal microcantilevers

Hajilou¹,

Deng²,

Kheradmand³

et al. 2017

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

show abstract

“…First, hydrogen attaches itself to dislocations that are freed from carbon or nitrogen by thermal fluctuations 16 . Next, hydrogen enhances the local plasticity (HELP) mechanism and change in the distribution of the dislocation 17 . Although the yield point did not appear significantly in the annealed cold-rolled sample after He + and H + implantations, the yield stress also decreased (dark curve); however, it was higher than the yield stress in the annealed cold-rolled sample after H + implantation (green curve).…”

Section: Discussionmentioning

confidence: 99%

Novel Methods for Prevention of Hydrogen Embrittlement in Iron

2017

Sci Rep

View full text Add to dashboard Cite

Iron is the most widely used metal in the world. However, hydrogen embrittlement in steels—iron based alloys—is an important issue related to the safety of our infrastructure, such as railroads and bridges. Therefore, the prevention of hydrogen embrittlement in steels is necessary. In the present study, we demonstrate two novel methods for the prevention of hydrogen embrittlement in iron: one involves the low-energy implantation of helium, which is usually an element harmful to metals, into iron, the other is inducing damage to the iron surface by ion irradiation. In general, irradiation with high-energy particles leads to metal brittleness. In the former method, the driving force for hydrogen embrittlement in iron is weakened, in the latter method, hydrogen diffusion in iron is prevented because of trapping of hydrogen atoms in the vacancies produced by the irradiation. As a result, hydrogen embrittlement in iron was suppressed by both methods.

show abstract

“…However, hydrogen degrades the mechanical properties of steel. [1][2][3][4][5][6] Therefore, it is essential to find hydrogen-resistant high-strength alloys and develop strategies for their application in this field. 7,8) Some important properties of the steel used in high-pressure hydrogen environments are allowable stress, reduction ratio, and strength reduction ratio, etc.…”

Section: Introductionmentioning

confidence: 99%

Influence of Stress Re-distribution on Hydrogen-induced Fatigue Crack Propagation

2019

Self Cite

View full text Add to dashboard Cite

Suppression Mechanism of Strain-age-hardening in Carbon Steel Associated with Hydrogen Uptake

Cited by 5 publications

References 36 publications

Hydrogen enhanced cracking studies on Fe–3wt%Si single and bi-crystal microcantilevers

Hydrogen enhanced cracking studies on Fe–3wt%Si single and bi-crystal microcantilevers

Novel Methods for Prevention of Hydrogen Embrittlement in Iron

Influence of Stress Re-distribution on Hydrogen-induced Fatigue Crack Propagation

Contact Info

Product

Resources

About