Effect of temperature on the charpy impact and CTOD values of type 304 stainless steel pipeline for LNG transmission

Baek, Jong-Hyun; Kim, Young-Pyo; Kim, Woo‐Sik; Kho, Young Tai

doi:10.1007/bf02984015

Cited by 14 publications

(13 citation statements)

References 7 publications

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“…At -196 °C , the friction welds were metastable and underwent a partial transformation to martensite during deformation. Evidence of martensitic transformation had been detected in the crack-tip plastic zone of austenitic and DSS impact specimens at cryogenic temperatures as low as liquid nitrogen [23]. At cryogenic temperatures, welds typically exhibited higher strength and lower toughness than their base metal.…”

Section: Charpy V-notch Impact Toughness Of Weldsmentioning

confidence: 99%

Characterization of microstructure, toughness, and chemical composition of friction-welded joints of UNS S32205 duplex stainless steel

2014

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Friction welding is a solid-state joining process which is applied extensively because of its advantages such as low heat input, efficient application, ease in manufacturing, and environmental friendliness. The present study investigates the mechanical and metallurgical properties of UNS S32205 duplex stainless steel frictionwelded joints. The process parameters, namely friction pressure, upsetting pressure, and rotational speed are individually varied from low level to high level (within the range of the machine setup) and their effects on the joint properties are analyzed. The partial-deformation zone had higher hardness than the weld and base metal. The toughness of the joints was evaluated at room temperature and at subzero temperature conditions. The impact toughness of the friction-welded joints was found to be superior to fusion-joined duplex stainless steel in room and cryogenic conditions.

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Section: Charpy V-notch Impact Toughness Of Weldsmentioning

confidence: 99%

Characterization of microstructure, toughness, and chemical composition of friction-welded joints of UNS S32205 duplex stainless steel

2014

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“…The most obvious temperature dependent parameter is the yield strength, which for most steels increase with decreasing temperature [2][3][4][5][6][7][8][9][10][11][12][13][14]. Another temperature dependent property is the ductile-to-brittle transition (DBT) in steels.…”

Section: Introductionmentioning

confidence: 99%

Effect of low temperature tensile properties on crack driving force for Arctic applications

Dahl

Ren

Akselsen

et al. 2018

Theoretical and Applied Fracture Mechanics

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Many petroleum companies expand their activities further north towards the Arctic region, resulting in design temperatures down to −60• C, which is much lower than what is usual for most current petroleum installations. As properties of steels are temperature dependent, it is of great interest to evaluate the effects of low temperature on the crack driving force in steels. The present work investigates these effects numerically using finite element (FE) models of single-edge-notchedtension (SENT) specimens with crack depths 0.1 ≤ a/W ≤ 0.5. The effects of Lüders strain, yield strength and crack depth on the crack tip opening displacement (CTOD) and the relation between CTOD and crack mouth opening displacement (CMOD) are studied, and it is shown that an increase in yield strength and Lüders strain, as a result of Arctic temperature, intensifies the crack driving force. It is also shown that the crack depth has very little influence on the effect of Lüders strain on the CTOD. An approximate model that can be used to estimate the CTOD based on yield strength, Lüders strain and loading is proposed for gross stress levels σ G /σ y ≤ 0.5 and a crack depth a/W = 0.5. It is finally shown that the tensile properties have a more significant effect on the CTOD-CMOD relation than the crack depth for a SENT specimen.Mange petroleumsselskaper utvider sine aktiviteter nordover mot arktiske områder. Dette fører til designtemperaturer ned til −60• C, noe som er mye lavere enn det som er vanlig for de fleste nåvaerende petroleumsinstallasjoner. Ettersom egenskapene til stål er temperaturavhengige, er det av stor interesseå evaluere effektene av lav temperatur på den drivende kraften for sprekkvekst i stål. Dette arbeidet undersøker disse effektene numerisk ved hjelp av elementmetoden med modeller av single-edge-notched-tension (SENT)-bruddprøver med sprekkdybder 0.1 ≤ a/W ≤ 0.5. Effektene av Lüders tøyning, flytespenning og sprekkdybde på sprekkspissutvidelsen (CTOD) og sammenhengen mellom CTOD og sprekkmunningsutvidelsen (CMOD) er studert, og det er påvist at økt flytespenning og Lüders tøyning, som et resultat av arktisk temperatur, fører til økt drivende kraft for sprekkvekst. Det er også vist at sprekkdybden har liten innflytelse på effekten av Lüders tøyning på CTOD. Det er foreslått en omtrentelig modell som kan bli brukt tilå estimere CTOD basert på flytespenning, Lüders tøyning og last for bruttospenningsnivåer σ G /σ y ≤ 0.5 og sprekkdybde a/W = 0.5. Det er til slutt påvist at materialets strekkegenskaper har en større virkning på CTOD-CMOD-forholdet enn sprekkdybden for en SENT-prøve.i ii PrefaceThe work presented here is a Master's thesis written at Department of Engineering Design and Materials at Norwegian University of Science and Technology (NTNU). The thesis work is carried out as a part of SMACC (Studies of materials behavior for future cold climate applications), which is a research project with several industry partners, and with SINTEF and NTNU as research partners.The author wishes to thank SINTEF fo...

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“…[30,40] Furthermore, ductile failure models, which include the inclusion content, predict that the inclusion spacing has a much stronger influence on the fracture toughness as yield strength increases, suggesting that the effect of inclusion spacing should be more pronounced at lower temperatures. [30] At cryogenic temperatures, yield strength increases because plastic deformation is energetically less favorable, since dislocation mobility is severely hindered, and plasticity only occurs locally ahead of the notch tip, where the applied stress is sufficiently high to overcome this mobility barrier.…”

Section: Discussionmentioning

confidence: 99%

“…This is revealed in CTOD testing of fracture mechanics specimens, in which the plastic component of notch opening displacement, V p , decreases with decreasing temperature, while the elastic component remains relatively constant. [40] If we assume void coalescence is more energetically favorable in HIP690 than F690, as a result of smaller spatial distances between voids due to the oxide spacings, then it follows that HIP690 should exhibit lower Charpy toughness than F690 at cryogenic temperatures. However, as the temperature increases, energy absorbed via microvoid coalescence is accompanied by a second mode of energy absorption: plastic deformation in the ligaments of the Charpy specimens as a result of decreasing yield strength.…”

Section: Discussionmentioning

confidence: 99%

Ductile Fracture Behaviour of Hot Isostatically Pressed Inconel 690 Superalloy

Cooper

Brayshaw

Sherry

2018

Metall Mater Trans A

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Herein we assess the differences in Charpy impact behavior between Hot Isostatically Pressed and forged Inconel 690 alloy over the temperature range of 300°C to À 196°C. The impact toughness of forged 690 exhibited a relatively small temperature dependence, with a maximum difference of ca. 40 J measured between 300°C and À 196°C, whereas the HIP'd alloy exhibited a difference of approximately double that of the forged alloy over the same temperature range. We have conducted Charpy impact testing, tensile testing, and metallographic analyses on the as-received materials as well as fractography of the failed Charpy specimens in order to understand the mechanisms that cause the observed differences in material fracture properties. The work supports a recent series of studies which assess differences in fundamental fracture behavior between Hot Isostatically Pressed and forged austenitic stainless steel materials of equivalent grades, and the results obtained in this study are compared to those of the previous stainless steel investigations to paint a more general picture of the comparisons between HIP vs forged material fracture behavior. Inconel 690 was selected in this study since previous studies were unable to completely omit the effects of strain-induced martensitic transformation at the tip of the Chary V-notch from the fracture mechanism; Inconel 690 is unable to undergo strain-induced martensitic transformation due to the alloy's high nickel content, thereby providing a sister study with the omission of any martensitic transformation effects on ductile fracture behavior.

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Effect of temperature on the charpy impact and CTOD values of type 304 stainless steel pipeline for LNG transmission

Cited by 14 publications

References 7 publications

Characterization of microstructure, toughness, and chemical composition of friction-welded joints of UNS S32205 duplex stainless steel

Characterization of microstructure, toughness, and chemical composition of friction-welded joints of UNS S32205 duplex stainless steel

Effect of low temperature tensile properties on crack driving force for Arctic applications

Ductile Fracture Behaviour of Hot Isostatically Pressed Inconel 690 Superalloy

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