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

Park, Dong-Yeob; Amirkhiz, Babak Shalchi; Gravel, Jean-Philippe; Liang, Jie; Zavadil, Renata; Liu, Pei; Duan, Da-Ming

doi:10.1007/s10704-017-0240-0

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…Delamination is a typical phenomenon on the fracture surface of steel plates with elongated microstructures and intense {100} plane texture (cleavage plane in the BCC metal), which can be found in the researches of Song et al, Zou et al, and so on . According to the investigations about delamination, it can be concerned that elongated microstructure morphology and {100} plane texture are mainly responsible for delamination . Because the {100} plane texture can promote the nucleation of delaminated crack, and the elongated grain boundary can act as propagation path for the delaminated crack.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Initial Microstructure on Microstructure Evolution and Mechanical Properties of Intercritically Rolled Low‐Carbon Microalloyed Steel Plates

Shen

Chen

et al. 2019

steel research int.

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Steel plates rolled in the intercritical region have ultrafine and elongated‐grained microstructures, and excellent toughness. The effect of the initial microstructure on microstructure evolution and the mechanical properties of intercritically rolled (IR) low‐carbon microalloyed steel plates is investigated herein. Coarse‐grained initial microstructure mainly containing lath bainite and fine‐grained initial microstructure mainly containing quasi‐polygonal ferrite are produced by austenitization treatments at different temperatures. The results show that the coarse‐grained initial microstructure restrains continuous dynamic recrystallization during intercritical rolling, which leads to a less fraction of high‐angle grain boundaries (HAGBs). However, initial microstructure has little influence on the average size of ferrite grains surrounded by HAGBs. Moreover, coarse‐grained initial microstructure results in a relatively higher strength improving about 15 MPa due to the lower fraction of HAGBs. Fine‐grained initial microstructure is beneficial to the Charpy impact toughness such that the upper shelf energy is improved from 108 to 118 J, and low‐temperature toughness is also enhanced. However, the effect of the initial microstructure on the microstructure and mechanical properties of IR rolled steel plates is not great, which indicates that coarse‐grained initial microstructure can also be used to develop this kind of steel plates with excellent toughness.

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Section: Resultsmentioning

confidence: 99%

The Effect of Initial Microstructure on Microstructure Evolution and Mechanical Properties of Intercritically Rolled Low‐Carbon Microalloyed Steel Plates

Shen

Chen

et al. 2019

steel research int.

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show abstract

“…The effects of different fatigue crack prefabrication forces on fracture toughness of API X70 pipeline steel were investigated by Nowak-Coventry et al [20]. The formation mechanism of delamination cracks in API X70 pipeline steel was studied by Park et al [21] using tensile fracture toughness testing. The delamination cracks of tensile and ductile specimens were shown to be intergranular cracks by observing the microstructure of API X70 pipeline steel.…”

Section: Introductionmentioning

confidence: 99%

Stress Triaxial Constraint and Fracture Toughness Properties of X90 Pipeline Steel

Wang

Hao²,

Xie³

et al. 2022

Metals

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The X90 pipeline steel with high-strength and high-toughness become the most popular pipeline steel. Due to the stress triaxial constraint and fracture toughness properties are the key factors for the stable work of pipeline steel, the research on the fracture toughness of X90 is a great significance to promote the engineering application of high-strength pipeline steel. In order to investigate the stress triaxial constraint and fracture toughness properties of X90 pipeline steel, the experimental rules with different grooves size are proposed using the common toughness experiment and the corresponding numerical models are established in this paper. The resistance curves and fracture toughness of each type of specimens are obtained and compared with that of finite element analysis. Furthermore, the stress distribution, J-integral distribution and stress triaxial constraint of the specimen are analyzed, as well as the influence of side grooves size on the determination of fracture toughness is also discussed. The results obtained from the study will provide a reference to the fracture toughness evaluation research and application of X90 pipeline steel.

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Revealing the failure mechanism of industrial Fe-25Cr-20Ni stainless steel plate: Fine-grained segregation band and brittle phase induced delamination cracking

Wang,

Chen,

et al. 2024

Engineering Failure Analysis

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

Cited by 4 publications

References 13 publications

The Effect of Initial Microstructure on Microstructure Evolution and Mechanical Properties of Intercritically Rolled Low‐Carbon Microalloyed Steel Plates

The Effect of Initial Microstructure on Microstructure Evolution and Mechanical Properties of Intercritically Rolled Low‐Carbon Microalloyed Steel Plates

Stress Triaxial Constraint and Fracture Toughness Properties of X90 Pipeline Steel

Revealing the failure mechanism of industrial Fe-25Cr-20Ni stainless steel plate: Fine-grained segregation band and brittle phase induced delamination cracking

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