Near- threshold Fatigue Crack Growth Behavior and Crack Closure of Natural Gas Pipeline Steels

Kim, Young-Pyo; Kim, Cheol-Man; Kim, Woo‐Sik; Song, Kyung Ja; Shin, Kuk-Hyun

doi:10.1016/j.proeng.2011.04.134

Cited by 5 publications

(4 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At higher crack growth rate the sigmoidal curves tended to converge. These behaviors can be explained by the crack closure phenomenon 13,14,43,44 . Figure 6b presents the crack closure levels of the two steels as a function of ∆K.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Microstructure and mechanical properties of two Api steels for iron ore pipelines

et al. 2014

View full text Add to dashboard Cite

This research compares the mechanical behavior of two API steels (X60 and X70) used in the longest pipeline in the world for the conveyance of iron ore. Tensile tests, Charpy impact tests, CTOD tests and fatigue crack growth tests are performed at ambient temperature. Metallographic examination showed a banded microstructure consisting of polygonal ferrite and pearlite in both steels, with smaller grain size and the presence of a small quantity of bainite in the X70 steel. All the mechanical tests revealed a ductile behavior for the two steels. The X70 steel is preferable for the pipeline project, due its better mechanical resistance, with no significant loss of fracture toughness and fatigue resistance. Its performance could be even better, if an appropriate combination of thermomechanical processing parameters were able to produce a microstructure with minor amount of pearlite, where acicular ferrite/bainite are present.

show abstract

Section: Resultsmentioning

confidence: 99%

“…However, little information is available on fracture toughness and fatigue, mainly on near-threshold fatigue crack growth behavior 13,14 . Therefore, the present study was undertaken to evaluate the behavior of two commercial microalloyed API pipeline steels manufactured by Brazilian steel plants.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of two Api steels for iron ore pipelines

et al. 2014

View full text Add to dashboard Cite

show abstract

“…At higher crack growth rate the sigmoidal curves tended to converge. These behaviors can be explained by the crack closure phenomenon [20][21][22]54,55 . Figure 6 presents the crack closure levels of the three steels as a function of ΔK TH .…”

Section: Steel Grade Ae (J)mentioning

confidence: 99%

“…However, these methods are not based on fracture mechanics concepts to evaluate fracture toughness and fatigue resistance, and their data have large deviations because they largely depend on the specimen size and geometry. Little information is available on fracture toughness [13][14][15][16][17][18][19] and fatigue crack growth resistance [20][21][22] , mainly on near-threshold fatigue crack growth behavior. It is also important to note that the publications are mainly concentrated on welded microalloyed steel pipes, obtained from thermomechanical operations (controlled rolling), with a characteristically complex microstructure.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Microstructure and Mechanical Properties of Seamless Steel Pipes API 5L Type Obtained by Different Processes of Heat Treatments

2017

View full text Add to dashboard Cite

This research presents the influence of manufacturing processes and heat treatments on the resulting microstructures and mechanical properties of an API 5L PSL2 seamless steel pipe. Three different conditions are considered -as rolled, normalized and quenched and tempered -to obtain the grades X42R, X42N and X70Q, respectively. Scanning electron microscopy techniques was used to characterize the resultant microstructures. Tensile, hardness, impact, fracture toughness (J integral) and fatigue crack growth tests (da/dN x ΔK) were used to study the materials mechanical behavior. The results show the possibility of achieving API grades for a seamless pipeline steel, through suitable heat treatments. The microstructural modifications and mechanical properties changes observed showed a remarkable structure-properties relationship of the steel, and attempt to a proper selection as required by the structural design. The quenching and tempering process increased tensile mechanical properties and fracture toughness, but combined to a significant decrease in fatigue crack growth resistance.

show abstract

Stress corrosion cracking and corrosion fatigue analysis of API X70 steel exposed to a circulating ethanol environment

Santos

Giorgetti

Júnior

et al. 2022

International Journal of Pressure Vessels and Piping

View full text Add to dashboard Cite

Near- threshold Fatigue Crack Growth Behavior and Crack Closure of Natural Gas Pipeline Steels

Cited by 5 publications

References 10 publications

Microstructure and mechanical properties of two Api steels for iron ore pipelines

Microstructure and mechanical properties of two Api steels for iron ore pipelines

Evaluation of Microstructure and Mechanical Properties of Seamless Steel Pipes API 5L Type Obtained by Different Processes of Heat Treatments

Stress corrosion cracking and corrosion fatigue analysis of API X70 steel exposed to a circulating ethanol environment

Contact Info

Product

Resources

About