Delamination of pipeline steels: determination of an anisotropic cleavage criterion

Tankoua, Franck; Crépin, Jérôme; Thibaux, Philippe; Arafin, Muhammad; Cooreman, Steven; Gourgues, Anne-Françoise

doi:10.1051/meca/2014001

Cited by 4 publications

(4 citation statements)

References 13 publications

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“…The latter specimens did not have a typical cup-and-cone fracture shape, which indicates a low or very low ductility, and the fracture surfaces were divided in two B parts by the center. Tankoua et al [10] studied the influence of test temperature on the fracture surface of Arcelor pipeline steel. Specimen orientations were 0° and 90° according to the rolling direction.…”

Section: Influence Of Heat Treatment Test Temperature and Irradiationmentioning

confidence: 99%

“…secondary cracks parallel to the rolling plane, have been observed on high strength steels [1][2][3][4][5][6][7][8][9][10], aluminum-lithium alloys [11][12][13][14][15], Ti-stabilized stainless steels [16,17] and ultrafine-grained steels [18]. Different types of delamination cracks in combination with different orientations of the specimen direction had been identified [13,19].…”

Section: Introductionmentioning

confidence: 99%

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Short review: Potential impact of delamination cracks on fracture toughness of structural materials

Arnoult¹,

Ružicková²,

Kunzová³

et al. 2015

Frattura Ed Integrità Strutturale

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ABSTRACT. The current energy policy envisages extended lifetime for the current nuclear power plants (GEN II NPP). This policy imposes a large research effort to understand the ageing of power plant components. In this goal, it is necessary to improve knowledge about safety, reliability and components' integrity for more than forty years of operation. In Central and Eastern Europe, the majority of NPPs are VVER types, where some of the components are produced from austenitic steel 08Ch18N10T. Irradiated 08Ch18N10T may exhibit brittle behavior, namely delamination cracks are found in some cases on the fracture surface of irradiated 08Ch18N10T with elongated δ-ferrite. Delamination cracks have also been observed on the fracture surface of high-strength steels or aluminum-lithium alloys. This article presents a state-of-the art review to provide a detailed analysis of the influence of delamination cracks on the toughness of metal alloys. In general, the delamination cracks are present in metal alloys having a high texture and microstructure anisotropy. Three types of delamination cracks have been observed and are classified as crack arrester delamination, crack divider delamination and crack splitting delamination. The microscopy characterization, 3D fracture theories and computational studies explaining possible causes and effects of delamination cracks on the mechanical properties of metal alloys are presented.

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Section: Influence Of Heat Treatment Test Temperature and Irradiationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Short review: Potential impact of delamination cracks on fracture toughness of structural materials

Arnoult¹,

Ružicková²,

Kunzová³

et al. 2015

Frattura Ed Integrità Strutturale

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show abstract

“…Because of symmetry only one eighth of the specimen was modeled. A uniform displacement was prescribed at the end together with usual symmetry conditions, see Tankoua (2014). The experimental results and the results predicted by the model were in good agreement (discrepancy lower than 5% for almost all experimental curves on notched and smooth specimens).…”

Section: Estimate Of the Critical Cleavage Stressmentioning

confidence: 78%

“…From quantitative fractography results of Tankoua (2014), internal misorientations up to 15° were allowed to define every potential facet. Fig.…”

Section: Analysis Of the Microtexture (Potential Cleavage Facets)mentioning

confidence: 99%

Quantitative Investigation of Brittle Out-of-plane Fracture in X70 Pipeline Steel

Tankoua

Crépin

Thibaux

et al. 2014

Procedia Materials Science

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Brittle out-of-plane cracking (by delamination or brittle tilted fracture) affects the impact toughness of pipeline steels. It has been investigated on notched tensile specimens using a local approach to fracture. Smooth and notched bars taken along four directions (including the short transverse direction, ND) have been tested in tension at temperatures between 20°C and -196°C. Delamination partly results from the lower value of the critical cleavage stress along ND, linked to the microtexture anisotropy, but also from the presence of ductile microcracks acting as stress concentrators triggering fracture along the rolling plane. Brittle tilted fracture was associated to a relatively lower value of the critical cleavage stress in that plane, but prior delamination was necessary to trigger it. The relevance of a macroscopic critical stress criterion for delamination is finally discussed.

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Forming mechanism of delamination cracks observed during tensile and fracture toughness testing of X70 pipeline steel

et al. 2017

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Delamination of pipeline steels: determination of an anisotropic cleavage criterion

Cited by 4 publications

References 13 publications

Short review: Potential impact of delamination cracks on fracture toughness of structural materials

Short review: Potential impact of delamination cracks on fracture toughness of structural materials

Quantitative Investigation of Brittle Out-of-plane Fracture in X70 Pipeline Steel

Forming mechanism of delamination cracks observed during tensile and fracture toughness testing of X70 pipeline steel

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