Effect of ultrafine grain refinement on hydrogen embrittlement of metastable austenitic stainless steel

Mine, Yoji; Horita, Nobuaki; Horita, Zenji; Takashima, Kazuki

doi:10.1016/j.ijhydene.2017.04.249

Cited by 56 publications

(16 citation statements)

References 39 publications

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“…Mine et al [9] demonstrated no change in the tensile strength of the SPD-processed specimens of 310S austenitic stainless steel after high temperature gaseous charging up to 40 mass ppm concentration of hydrogen. The mitigation of hydrogen-induced ductility loss by ultrafine grain refinement has been found in 304 metastable austenitic stainless steel [7]. Astafurova et al [8] concluded that the highly defective grain-subgrain microstructure with the high dislocation density alleviates hydrogen embrittlement effects in UFG Cr-Ni-Mo and Cr-Ni-Ti steels.…”

Section: Introductionmentioning

confidence: 99%

Effect of equal-channel angular pressing (ECAP) and current density of cathodic hydrogen charging on hydrogen trapping in the low-alloy steel

et al. 2020

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Owing to the outstanding mechanical properties, the steels and other metallic materials with the ultra-fine grained (UFG) microstructure obtained by severe plastic deformation (SPD) techniques such as equal channel angular pressing (ECAP) have been in the spotlight of the material science and engineering community over the last few decades. Nevertheless, the data on environmental effects such as stress-corrosion cracking and hydrogen embrittlement (HE) on the performance of the UFG ferritic steels is still limited and is awaiting for clarification and thorough comprehensive examination. In the present study, the effect of the current density of cathodic hydrogen charging on the hydrogen concentration and state in the ECAPed and as-received low-carbon steel grade 09G2S has been investigated by the hot-extraction gas-analysis. It is found that due to the increased dislocation density and the total length (or volume fraction) of grain boundaries the ECAPed steel occludes much more hydrogen than its as-received counterpart at the same hydrogen charging conditions. Besides, the hydrogen concentration in the ECAPed steel is significantly changed at current densities below 20 mA / cm 2 only and is not affected by hydrogen-induced cracking. In contrast, the non-monotonous growth of the hydrogen concentration in the as-received steel occurs at the increasing current density up to 340 mA / cm 2 and is controlled by the extent of hydrogen-induced damage.

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Section: Introductionmentioning

confidence: 99%

Effect of equal-channel angular pressing (ECAP) and current density of cathodic hydrogen charging on hydrogen trapping in the low-alloy steel

et al. 2020

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“…While analysis after hydrogen embrittlement demonstrates mixed modes of brittle and ductile fracture, the fracture morphology recognized the distribution of tiny and large dimples. Matsuo et al [22] stated that the hydrogen had reduced the average dimple size in stainless steel type 316L, which is distinct from the average dimple size [27]. Both tests show similar fracture features, clearly shows that the cracks started in the ferrite phase as confirmed by Zucchi et al [28].…”

Section: Hardness Testmentioning

confidence: 72%

“…The presence of hydride will reduce the ductility of the metal. The primary type of corrosion of stainless steel 316L is hydrogen embrittlement, which allows hydrogen ions to spread easier in the specimens, producing brittle carbide and hydride precipitates that reduce mechanical characteristics [26][27][28]. The fracture mode of stainless steel 316L sample before electrochemical test is shown in Figure 12a.…”

Section: Hardness Testmentioning

confidence: 99%

Hydrogen Embrittlement of 316L Stainless Steels Exposed in 1.0M Hydrochloric Acid Solution

Hadi¹,

Saud²,

Hamzah³

et al. 2019

ACSM

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This paper aims to determine the different sources of hydrogen that cause hydrogen embrittlement in ferrous materials. The 316L stainless steel was selected as the research object, and subjected to immersion and electrochemical tests in 1.0M HCl solution. The hardness and tensile strength of the test samples were measured before and after hydrogen embrittlement. The hydrogen, which exists in the form of hydrides, was detected through Xray diffractometry (XRD), while the fracture profile and microstructure of the samples were observed through optical microscopy and scanning electron microscopy (SEM), respectively. The results show that the hydrogen ions diffused into the surface of the steel, forming iron hydrides. In this way, the hardness of the steel was enhanced, and brittle failure occurred under tensile load; the amount of hydrides and the probability of hydrogen embrittlement increase with the immersion time in the acid solution; the sample immersed in 1.0M HCl for one day presented the most prominent hydrogen embrittlement, i.e. the highest hardness and lowest ductility. The research results provide insights into the occurrence of hydrogen embrittlement in ferrous materials.

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“…800 MPa. It is a major challenge to increase the yield strength of advanced high-strength austenitic steels because of a risk of hydrogen embrittlement under severe external conditions 28 . Therefore, we anticipate that our findings will aid in the development of advanced high-strength steels, and motivate research into understanding the relationship between nitrogen and nickel contents in steel.…”

Section: Resultsmentioning

confidence: 99%

Excellent mechanical properties of taenite in meteoric iron

Ueki

Mine

Takashima

2021

Sci Rep

Self Cite

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Meteoric iron is the metal that humans first obtained and used in the earliest stage of metal culture. Advances in metallographic analysis techniques have revealed that meteoric iron largely comprises kamacite, taenite, and cohenite, which correspond to ferrite, austenite, and cementite in artificial steel, respectively. Although the mechanical properties of meteoric irons were measured previously to understand their origin and history, the genuine mechanical properties of meteoric iron remain unknown because of its complex microstructure and the pre-existing cracks in cohenite. Using micro-tensile tests to analyse the single-crystalline constituents of the Canyon Diablo meteorite, herein, we show that the taenite matrix exhibits excellent balance between yield strength and ductility superior to that of the kamacite matrix. We found that taenite is rich in nitrogen despite containing a large amount of nickel, which decreases the nitrogen solubility, suggesting that solid-solution strengthening via nitrogen is highly effective for the Fe–Ni system. Our findings not only provide insights for developing advanced high-strength steel but also help understand the mysterious relationship between nitrogen and nickel contents in steel. Like ancient peoples believed that meteoric iron was a gift from the heavens, the findings herein imply that this thought continues even now.

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Effect of ultrafine grain refinement on hydrogen embrittlement of metastable austenitic stainless steel

Cited by 56 publications

References 39 publications

Effect of equal-channel angular pressing (ECAP) and current density of cathodic hydrogen charging on hydrogen trapping in the low-alloy steel

Effect of equal-channel angular pressing (ECAP) and current density of cathodic hydrogen charging on hydrogen trapping in the low-alloy steel

Hydrogen Embrittlement of 316L Stainless Steels Exposed in 1.0M Hydrochloric Acid Solution

Excellent mechanical properties of taenite in meteoric iron

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