Fracture propagation control in very high strength gas pipelines

Buzzichelli, G.; Scopesi, L.

doi:10.1051/metal:2000119

Cited by 9 publications

(5 citation statements)

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“…As a result, the driving force for propagation decreases below that necessary for crack growth and, ideally, the fracture does not extend beyond a single length of pipe. Conversely, in a low toughness steel, cracks can propagate much more quickly than the drop in gas pressure and the fracture can extend for several kilometers before the pressure decreases sufficiently to arrest the crack [2,3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Austenite Recrystallization on Toughness of Pipeline Steels

Jonas

2013

MSF

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The factors affecting pipeline fractures are reviewed briefly, with particular emphasis on the influence of the {100} texture component. The deformation texture components introduced by rolling in the austenite temperature range are introduced, together with the component changes associated with recrystallization. The effect of the γ-to-α phase transformation on the austenite deformation and recrystallization texture components is described. The changes to the texture brought about by rolling in the ferrite (or in the intercritical) phase field are also outlined. The controlled rolling parameters that promote minimization of the texture intensity of the deleterious {100} component are summarized.

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Section: Introductionmentioning

confidence: 99%

Effect of Austenite Recrystallization on Toughness of Pipeline Steels

Jonas

2013

MSF

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“…Considerable research on the properties of low and high grades pipeline steels and their welding techniques and characteristics have been carried out 7,8 . On one hand, full‐scale pipeline burst experiments provide fracture data from real structure under its design pressure and temperature 9,10 . On the other hand, small‐scale laboratory tests study the fracture behaviour of pipeline material under quasi‐static and high‐strain rate tests, and examine the metallurgical properties of welded regions 11–13 .…”

Section: Introductionmentioning

confidence: 99%

On the relation of microstructure and impact toughness characteristics of DSAW steel of grade API X70

Hashemi

Mohammadyani

Pouranvari

et al. 2009

Fatigue Fract Eng Mat Struct

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A B S T R A C T In this research, mechanical characteristics of double submerged arc-welded line pipe steel of grade API X70 (70ksi yield strength) were investigated. Different experimental examinations including chemical analysis, microstructural investigation, microhardness, tensile and Charpy tests and standard fractography were carried out on different zones of test material. Impact properties of the fusion zone, the heat-affected zone (HAZ) and the base metal were measured on an instrumented Charpy rig and correlated then to their microstructural features. The experimental results showed that the base metal was the toughest, and fusion zone was the least tough region with average Charpy energy of 222 and 128 J, respectively. The latter fulfilled service requirements set by API 5L, despite its relatively low impact energy. Interestingly, the cast microstructure and presence of grain boundary phases such as proeutectoid ferrite in fusion zone confirmed its low energy characteristics. Reduction in HAZ impact energy (compared to base metal) was observed too, together with grain coarsening and the associated HAZ softening adjacent to the weld.

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“…The conventional approach for characterising the fracture resistance of the pipe material is the use of the Charpy upper shelf energy. However, it has been revealed that the application of shelf energy can result in significant error when the material toughness is increased [1][2][3]. This indicates that the semi-empirical formulae calibrated on test data from less tough steels cannot be extrapolated to assess the fracture toughness of modern tough pipeline steels.…”

Section: Introductionmentioning

confidence: 99%

An Experimental and Finite Element Study of the Ductile Tearing Characteristics of High-Toughness Gas Pipeline Steel

Ayvar

Hashemi

Howard

et al. 2006

AMM

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This paper reports recent results from a set of experimental and computational studies of ductile flat fracture in modern gas pipeline steel. Experimental data from plain and notched cylindrical tensile bars and standard C(T) specimens together with damage mechanics theories have been used to capture the flat fracture characteristics of a gas pipeline steel of grade X100. The modelling was via finite element analysis using the Gurson-Tvergaard modified model (GTN) of ductile damage development. The assumption of effective material damage isotropy was sufficiently accurate to allow the transfer of data from the notched bars to predict, in a 2D model, the crack growth behaviour of the C(T) specimen. This was in spite of the considerable ovalisation of the bars at the end of their deformation. However, it was not possible to obtain similar accuracy with a 3D model of the C(T)test, even after a large number of attempts to adjust the values of the GTN parameters. This, and the anisotropic shape change in the tensile bars, suggests very strongly that the damage behaviour is so anisotropic that conventional models are not good enough for a full engineering description of the flat fracture behaviour. Suitable averaging (of shape) in the modelling of the notched bar data, and the companion averaging associated with the 2D model of the C(T) data provide a relatively fast way of transferring engineering data in the tests. There is a discussion of potential ways in which to incorporate 3D effects into the modelling for those purposes where the considerable increase in computational time (due to the microstructurally-sized finite elements needed to capture the damage behaviour) is acceptable in order to include through-thickness effects.

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Fracture propagation control in very high strength gas pipelines

Cited by 9 publications

References 0 publications

Effect of Austenite Recrystallization on Toughness of Pipeline Steels

Effect of Austenite Recrystallization on Toughness of Pipeline Steels

On the relation of microstructure and impact toughness characteristics of DSAW steel of grade API X70

An Experimental and Finite Element Study of the Ductile Tearing Characteristics of High-Toughness Gas Pipeline Steel

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