Creep deformation and failure of E911/E911 and P92/P92 similar weld-joints

Falat, Ladislav; Výrostková, A.; Homolová, Viera; Svoboda, Milan

doi:10.1016/j.engfailanal.2009.02.004

Cited by 51 publications

(27 citation statements)

References 17 publications

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“…. It is also consistent to the values used in other published works for different welds, where the widths of the HAZ and type IV zones were assumed to be 2–3 and ~1 mm, respectively.…”

Section: Resultssupporting

confidence: 90%

Quantification of creep stresses within HAZ in welded branch junctions

Han

Kim

Jerng

et al. 2014

Fatigue Fract Eng Mat Struct

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This paper quantifies the mismatch effect in creep properties on creep stresses in the heat‐affected zone of welded branches using systematic elastic‐creep finite element analysis. It is found that the section‐averaged normalized stresses in the heat‐affected zone can be uniquely characterized by the mismatch factor in creep. The relationship is almost linear and is not so sensitive to the loading condition. Implication to practical creep life assessment of welded branch components is discussed in the context of the R5 procedure.

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“…. It is also consistent to the values used in other published works for different welds, where the widths of the HAZ and type IV zones were assumed to be 2–3 and ~1 mm, respectively.…”

Section: Resultssupporting

confidence: 90%

Quantification of creep stresses within HAZ in welded branch junctions

Han

Kim

Jerng

et al. 2014

Fatigue Fract Eng Mat Struct

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show abstract

“…Following i) and ii), it has been suggested that dislocation climb is the rate-controlling mechanism of creep at both high stress and elevated temperature. Based on the existing studies of creep in polycrystalline metallic materials [18,57] and the more recent studies on other 9% Cr steels [33,58,59], dislocation climb is stated as an out-of-plane movement for edge dislocations. Its rate depends on many factors, including chemical forces, the mobility of jogs and the rate of migration of vacancies [60].…”

Section: Discussionmentioning

confidence: 99%

Investigation of short-term creep deformation mechanisms in MarBN steel at elevated temperatures

Benaarbia

Sun

et al. 2018

Materials Science and Engineering: A

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This paper reports the short-term creep behaviour at elevated temperatures of a MarBN steel variant. Creep tests were performed at three different temperatures (625°C, 650°C and 675°C) with applied stresses ranging from 160 MPa to 300 MPa, and failure times from 1 to 350 h. Analysis of the macroscopic creep data indicates that the steady-state creep exhibits a power-law stress dependence with an exponent of 7 and an activation energy of 307 kJ mol, suggesting that dislocation climb is the dominant rate-controlling creep mechanism for MarBN steel. Macroscopic plastic instability has also been observed, highlighted by an obvious necking at the rupture region. All the macroscopic predictions have been combined with microstructural data, inferred from an examination of creep ruptured samples, to build up relations between macroscopic features (necking, damage, etc.), and underlying microstructural mechanisms. Analysis of the rupture surfaces has revealed a ductile fracture mode. Electron Backscatter Diffraction (EBSD) analysis near to the rupture surface has indicated significant distortion and refinement of the original martensitic substructure, which is evidence of long-range plastic flow. Dislocation pile-ups and tangles from TEM were also observed near substructure boundaries and precipitate particles. All of these microstructural observations suggest that creep is influenced by a complex interaction between several elements of the microstructure, such as dislocations, precipitates and structure boundaries. The calculated stress exponent and activation energy have been found to agree quantitatively with the highlighted microstructural features, bearing some relationships to the true observed creep microstructures.

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“…The stress exponent n is found to decrease from 22.4 to 17.9 as temperature increases from 500°C to 538°C. The value of stress exponent in this investigation is higher than other researches [26,28] because the higher stresses were employed. These results indicate that the power-law breakdown (PLB) regime is the dominant creep failure mechanism for this dissimilar steels welded joint under high stress.…”

Section: Elementsmentioning

confidence: 69%

“…It is reported for 9Cr-1Mo similar welded joints that creep rupture always occurred at fine grain heat affected zone (FG-HAZ) under long-term creep tests with lower stress and higher temperature conditions. This is called as Type IV creep fracture [25,26], which is caused by the lack of precipitation strengthening at prior austenite grain boundaries. And the addition of B could enhance the boundary strengthening by precipitates and prevent the Type IV creep fracture [27,28].…”

Section: Introductionmentioning

confidence: 99%

Creep behavior and microstructure evaluation of welded joint in dissimilar modified 9Cr–1Mo steels

Liu

et al. 2015

Materials Science and Engineering: A

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Creep deformation and failure of E911/E911 and P92/P92 similar weld-joints

Cited by 51 publications

References 17 publications

Quantification of creep stresses within HAZ in welded branch junctions

Quantification of creep stresses within HAZ in welded branch junctions

Investigation of short-term creep deformation mechanisms in MarBN steel at elevated temperatures

Creep behavior and microstructure evaluation of welded joint in dissimilar modified 9Cr–1Mo steels

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