A Study on the VHCF Fatigue Behaviors of Hydrogen Attacked Inconel 718 Alloy

Suh, Chang‐Min; Nahm, Seung Hoon; Kim, Jun‐Hyong; Pyun, Young Sik

doi:10.3795/ksme-a.2016.40.7.637

Cited by 6 publications

(4 citation statements)

References 14 publications

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“…Inconel 718 [2] and AISI 316 L stainless steel [3], the depth of influence of hydrogen also could not be measured. However in previous studies, the influence of hydrogen was small in the AISI 316 L material [3]; however in the Inconel 718 material [2], the influence of hydrogen was very large, and fatigue limit gradually decreased. Using the growth characteristics of the surface cracks in Figure 9(A) and Figure 9(B), the fracture mechanics of the surface crack initiation and growth processes can be analyzed.…”

Section: Electron Back Scatter Diffraction Analysis Of Aisi 304 Stainmentioning

confidence: 99%

“…In particular, social productivity has occurred for hydrogen electric vehicles, and Germany, Japan, and the United States have implemented hydrogen-related infrastructure, such as hydrogen stations, under the full support of their governments' hydrogen and fuel cell industries. Therefore, knowledge [1] [2] [3] and data for measurement and related technologies related for metal penetration and permeation for the safe supply and storage of hydrogen are urgently required [4] [5] [6] [7] [8].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, this is a follow-up study to those for Inconel 718 [2] and AISI 316L stainless steel [3] materials. We studied AISI 304 stainless steel embrittled specimens with hydrogen at high temperature and high pressure with respect to safety to realize a hydrogen economy.…”

Section: Introductionmentioning

confidence: 99%

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Very High Cycle Fatigue Behaviors and Surface Crack Growth Mechanism of Hydrogen-Embrittled AISI 304 Stainless Steels

Nahm¹,

Shim²,

Baek³

et al. 2018

MSA

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The influence of hydrogen embrittlement on the fatigue behaviors of AISI 304 stainless steel is investigated. The fatigue endurance limits of the untreated and hydrogen-embrittled materials were almost the same at 400 MPa, and hydrogen embrittlement had little influence even though the sample contained about 8.1 times more hydrogen. Thus, the sensitivity of hydrogen gas in this material is very low. A surface crack initiation, growth, coalescence, and micro ridge model is proposed in this study. Slip line formation ⇒ microcrack formation ⇒ increases in the crack width, and blunting of the crack tip as it grows ⇒ formation of many slip lines because of deformation in the shear direction ⇒ growth of the crack in the shear direction, forming micro ridges, coalescence with adjacent cracks ⇒ continuous initiation, growth, coalescence, and ridge formation of surface cracks and specimen breakage.

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Section: Electron Back Scatter Diffraction Analysis Of Aisi 304 Stainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Very High Cycle Fatigue Behaviors and Surface Crack Growth Mechanism of Hydrogen-Embrittled AISI 304 Stainless Steels

Nahm¹,

Shim²,

Baek³

et al. 2018

MSA

Self Cite

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“…소재는 현재 STS 304L(오스테나이트계 스테인레스강) 등이 널리 사용되고 있다 (Chun et al, 2009;Kim et al, 2010;Kim et al, 2011Yu et al, 2013;Suh et al, 2016 (Amanov et al, 2012;Amanov et al, 2014;Gim and Jeong, 2007;Jeon et al, 2014;Lee et al, 2015;Pyun et al, 2012;Suh et al, 2016).…”

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Variations in Tribological Characteristics of SM45C by PVD Coating and Thin Films

Shim¹,

Suh²,

Kim³

et al. 2018

J. Ocean Eng. Technol.

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In order to accumulate data to lower the friction coefficient of a press mold, tribological tests were performed before and after coating SM45C with a PVC/PO film and plasma coating (CrN, concept). The ultrasonic nanocrystal surface modification (UNSM)-treated material had a nano-size surface texture, high surface hardness, and large and deep compressive residual stress formation. Even when the load was doubled, the small amount of abrasion, small weight of the abrasion, and width and depth of the abrasion did not increase as much as those of untreated materials. A comparison of the weight change before and after the tribological test with the CrN and the concept coating material and that of the untreated material showed that the wear loss of the concept coating material and P-UNSM treated material (that is, the UNSM treated material treated with the concept coating) showed a tendency to decrease by approximately 55-75%. Concept 100N had a lower friction coefficient of about 0.6, and P-UNSM-30-100N showed almost the same curve as concept 100N and had a low coefficient of friction of about 0.6. The concept multilayer coating had a thickness of 5.32 μm. In the beginning, the coefficient of friction decreased because of the plasma coating, but it started to increase from about 250-300 s. After about 350 s, the coefficient of friction tended to approach the friction coefficient of the SM45C base metal. The SGV-280F film-attached test specimen was slightly pushed back and forth, but the SM45C base material was not exposed due to abrasion. The friction coefficient was 0.22, which was the lowest, and the tribological property was the best in this study.

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A Comprehensive Examination of High-Temperature Hydrogen Attack—A Review of over a Century of Investigations

Poorhaydari

2021

J. of Materi Eng and Perform

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In this review article, many aspects of high-temperature hydrogen attack of steel are examined in a practical, topic-based format similar to that of API RP 571. This article is a result of reviewing over 220 articles on the subject, published mostly between 1938 and 2020, while some of them were already review articles citing research going back to the late nineteenth and the early twentieth centuries. The paper not only examines the historical evolution of our understanding of the damage mechanism, but it also discusses the current state of knowledge and the fields that are still under development or improvement. Questions are raised on a few important interpretations/classifications, namely the inclusion of decarburization as a form of HTHA, the division of incubation period to detectable and non-detectable stages of attack by API RP 941 and the recent distinction of non-conventional or non-classical HTHA in the literature, which may need re-evaluation. At the end, the interactions between HTHA and some other (related) damage mechanisms are discussed briefly and a failure case study is presented and discussed with respect to the use of incubation curves for the effect of an upset condition.

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A Study on the VHCF Fatigue Behaviors of Hydrogen Attacked Inconel 718 Alloy

Cited by 6 publications

References 14 publications

Very High Cycle Fatigue Behaviors and Surface Crack Growth Mechanism of Hydrogen-Embrittled AISI 304 Stainless Steels

Very High Cycle Fatigue Behaviors and Surface Crack Growth Mechanism of Hydrogen-Embrittled AISI 304 Stainless Steels

Variations in Tribological Characteristics of SM45C by PVD Coating and Thin Films

A Comprehensive Examination of High-Temperature Hydrogen Attack—A Review of over a Century of Investigations

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