A Study of Brittle Crack Arrestability Test Method

An, Gyubaek; Bae, Hong-Yeol; Park, Jeong-Ung

doi:10.5781/jwj.2020.38.6.3

Cited by 2 publications

(3 citation statements)

References 17 publications

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“…11, x FOR PEER REVIEW 8 of 15 QC fracture morphology involved the intergranular (IG) (Figure7c,e,f) and stair morphologies (Figure7d,e). QC and IG cracking are the most common fracture morphologies of HSC[26][27][28][29].…”

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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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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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“…The CAT value varies depending on the initial crack length and applied load. In ship design, the yield strength and material coefficient of each steel type are considered in setting design stress [6,7]. However, in this study, we determined design stress with two-thirds specific material yield stress [8] to utilize a more conservative approach.…”

Section: Small-scale Brittle Crack Arrest Test Methodsmentioning

confidence: 99%

“…However, with the increasing size of ships, the thickness of applied steel plates has rapidly increased, along with the increased risk of unstable fracture. Therefore, many studies have been conducted to ensure fracture safety [5][6][7][8][9][10][11][12][13][14][15][16]. In addition, steel with a high level of brittle crack arrest performance (brittle crack arrest steel (BCA steel)) has recently been developed by domestic and overseas steelmakers to prevent unstable fractures that may occur in thick plates [17].…”

Section: Introductionmentioning

confidence: 99%

Brittle Crack Arrest Temperature Estimation Method Utilizing a Small-Scale Test with a Thick Steel Plate for Shipbuilding

An,

Park,

Seong

et al. 2023

Metals

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As the shipbuilding industry has emerged from an extended recession, orders for high-value-added ships, such as LNG and ultra-large container ships, are increasing. For ultra-large container ships, high-strength, thick materials are applied. Because the possibility of brittle fracture increases owing to the application of thick steel plates, the related regulations of the International Association of Classification Societies have been strengthened to prevent brittle fracture. To secure brittle fracture stability, it is necessary to secure crack arrest toughness (Kca) through large ESSO experiments or to secure a crack arrest temperature (CAT) value. Because large-scale experiments require considerable costs and efforts, efforts have increased to examine brittle fracture stability through small-scale tests. In the present study, a technology was developed to predict CAT with small specimens. The CAT prediction formula developed with small specimens makes it possible to accurately predict CAT using data obtained through large-scale experiments.

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A Study of Brittle Crack Arrestability Test Method

Cited by 2 publications

References 17 publications

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

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

Brittle Crack Arrest Temperature Estimation Method Utilizing a Small-Scale Test with a Thick Steel Plate for Shipbuilding

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