Effects of dislocation-trapped helium on mechanical properties of Fe

Xu, Qiu; Sugiura, Yusaku; Pan, Xiaoxu; Sato, Koichi; Yoshiie, T.

doi:10.1016/j.msea.2014.06.019

Cited by 20 publications

(11 citation statements)

References 16 publications

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“…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). As indicated by Xu et al ., similar to hydrogen, the interstitial helium decreased the yield point in iron 9 . If the decrease in yield stress is due to the former mechanism, the decreased in yield stress in the sample after He + and H + implantations is more pronounced.…”

Section: Discussionmentioning

confidence: 90%

“…Similar to the analysis of helium diffusion in annealed cold-rolled iron 9 , the hydrogen diffusion behavior was simulated in the present study. In the calculations, the distribution of implanted hydrogen, which had a rectangular shape, was not the same as that shown in Supplementary Fig.…”

Section: Discussionmentioning

confidence: 94%

“…The hydrogen concentration at both surfaces was always zero. The rate of depth change in the hydrogen concentration can be expressed as 9 …”

Section: Discussionmentioning

confidence: 99%

“…The yield stress and tensile strength also increased slightly. Unexpectedly, it was reported that helium trapped by the dislocations improves the ductility of iron and nickel 9 – 11 . Although the mechanism for improving the ductility of iron and nickel by helium is still not clear, it is suggested that helium delays the aggregation of vacancies produced during sample tension, resulting in an increase in elongation.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, it was reported that helium trapped by dislocations in iron and nickel increases the total elongation of these metals 9 – 11 . These experimental results were contrary to expectation.…”

Section: Introductionmentioning

confidence: 99%

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Novel Methods for Prevention of Hydrogen Embrittlement in Iron

2017

Sci Rep

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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.

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 94%

“…The hydrogen concentration at both surfaces was always zero. The rate of depth change in the hydrogen concentration can be expressed as 9 …”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Novel Methods for Prevention of Hydrogen Embrittlement in Iron

2017

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Mechanical Properties and Hydrogen Embrittlement Resistance of the High‐Entropy Alloy CrFeMnNiCo and Its Subsystems

Xu,

Guan,

Huang

et al. 2024

Physica Status Solidi (b)

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The effects of hydrogen on the mechanical properties of CrNiCo and CrFeNiCo medium‐entropy alloys (MEAs) and CrFeMnNiCo high‐entropy alloys (HEAs) are investigated. Although their total elongation is less than that of the commonly used stainless steel (SS) 316L (SS316L), the tensile strengths of HEAs and MEAs are 150–350 MPa higher than that of SS316L. Hydrogen charging up to 1400 appm (nominal concentration) does not affect the tensile strength of SS316L; however, it decreases the elongation by less than 20%. In contrast, hydrogen increases the tensile strength of MEAs and HEA, but has little effect on elongation. Among the MEAs and HEAs, CrNiCo exhibits the highest tensile strength and total elongation. No brittle fracture due to hydrogen is observed on the fracture surfaces of the H‐charged samples. However, nanotwin structures are more common in H‐charged MEAs and HEAs than in H‐uncharged MEAs and HEA. Additionally, the calculation results based on the first‐principles reveal for the first time that single vacancies or tiny vacancy clusters do not trap H in MEAs compared to HEAs, such that cracks due to H are unlikely to occur. Thus, the hydrogen embrittlement resistance of MEAs may be improved.

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Helium bubble evolution and deformation of single crystal α-Fe

Wang

Liu

et al. 2018

J Mater Sci

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Effects of dislocation-trapped helium on mechanical properties of Fe

Cited by 20 publications

References 16 publications

Novel Methods for Prevention of Hydrogen Embrittlement in Iron

Novel Methods for Prevention of Hydrogen Embrittlement in Iron

Mechanical Properties and Hydrogen Embrittlement Resistance of the High‐Entropy Alloy CrFeMnNiCo and Its Subsystems

Helium bubble evolution and deformation of single crystal α-Fe

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