Experiments to separate the effect of texture on anisotropy of pipeline steel

Joo, Min Sung; Suh, Dong‐Woo; Bae, Jinho; Mouriño, Nuria Sánchez; Petrov, Roumen; Kestens, Léo; Bhadeshia, H. K. D. H.

doi:10.1016/j.msea.2012.07.033

Cited by 66 publications

(46 citation statements)

References 19 publications

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“…Hence, an increase of around 2 J of the upper shelf energy for the L-T orientation can be observed. The same toughening effects were studied by Joo et al 24,28,29 in an API-X80 steel, by Song et al 27,30 and by Kimura et al 26 in an ultrafine grained steel, by Hohenwarter 31 in an ultrafine-grained fully perlitic steel, and by Cockeram 20,22 in wrought molybdenum and its alloys. EBSD investigations of such delamination cracks (Fig.…”

Section: T-l and L-t Orientationmentioning

confidence: 53%

“…It is well known that the occurrence of these delamination cracks, which look like thin sheet ligaments, generate a toughening mechanism, also known as delamination toughening. 4,20,24,27,28 These thin ligaments deform plastically under a plane stress state introducing a larger plastic zone. The fracture toughness is increased due to the relaxation of the triaxial stress state at the crack tip.…”

Section: T-l and L-t Orientationmentioning

confidence: 99%

“…In recent studies, the mechanical properties of pipeline steels and ultrafine-grained bcc steels have been, among other methods, characterized by Charpy impact tests. 27,28 In this work, Charpy impact tests are combined with advanced characterization techniques to relate mechanical properties to the microstructure of technically pure molybdenum. Tensile tests and Charpy impact tests were conducted on samples of a technically processed molybdenum plate to investigate the role of delamination and crystallography on the DBTT in order to give an overview of the DBTTs in differently oriented specimens of a technically pure molybdenum plate in its stress-relieved and recrystallized state.…”

Section: Introductionmentioning

confidence: 99%

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Fracture Behavior and Delamination Toughening of Molybdenum in Charpy Impact Tests

Babinsky

Primig

Knabl

et al. 2016

JOM

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This study combines advanced characterization techniques with conventional Charpy impact tests to relate the mechanical properties to the microstructure of technically pure molybdenum, especially regarding its toughness. V-notched samples with different orientations were prepared from a rolled molybdenum plate in stress-relieved and recrystallized condition. The ductile-tobrittle transition-temperature was analyzed in terms of the delamination behavior influenced by the microstructure. A pronounced increase of toughness was found for specific oriented samples, which can be explained by macroscopic delamination. Elongated grains led to enhanced delamination in Charpy impact tests with variations for different orientations. In general, delamination occurs as a result of brittle fracture; however, an increase in toughness in the Charpy impact test can be provoked. This mechanism is called thin sheet toughening or delamination toughening. Electron backscatter diffraction measurements were performed to get a deeper knowledge about crack propagation and delamination behavior in the rolled plate. Recrystallization shifts the transition region to significantly higher temperatures, which is explained by the globular grain shape as well as grain boundary segregation. The occurrence of delamination is discussed, taking texture, grain shape and segregation effects into account.

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Section: T-l and L-t Orientationmentioning

confidence: 53%

Section: T-l and L-t Orientationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fracture Behavior and Delamination Toughening of Molybdenum in Charpy Impact Tests

Babinsky

Primig

Knabl

et al. 2016

JOM

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“…4, the martensite has a crystallographic texture which is frequently observed after double α-γ-α transformation of cold deformed bcc phase in AHHSs (De Knijf et al, 2014a). This is because the crystallographic texture has not changed much as a consequence of the Q&P treatment given to the as-received steel (Petrov et al, 2007;Joo et al, 2012). All texture components observed in the BCC structure originate from deformed austenite with a good agreement with the observed texture of the retained austenite.…”

Section: Influence Of Ptmentioning

confidence: 57%

Effect of Q&P parameters on microstructure development and mechanical behaviour of Q&P steels

Diego-Calderón¹,

Knijf²,

Molina-Aldareguia³

et al. 2015

REVMETAL

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Steel with a nominal composition of 0.25C-1.5Si-3Mn-0.023Al (mass %) was subjected to Quenching and Partitioning (Q&P) with varying parameters (quenching temperature, partitioning temperature and partitioning time) resulting in formation of multi-phase microstructure, which was thoroughly studied using X-ray (XRD) and Electron Backscatter Diffraction (EBSD). Mechanical properties of the Q&P steel were measured by tensile tests. Plastic deformation of Q&P steel at micro-scale was investigated by in situ tensile testing and digital image correlation analysis. The effect of Q&P parameters on the microstructure (phase composition, size and volume fraction of micro constituents, texture and carbon content in retained austenite) is discussed. After analyzing the mechanical properties, plastic deformation at the micro-scale and the microstructure, it is shown that the strain partitioning between phases strongly depends on the microstructure of the Q&P steel, which, in turn, can be tuned via manipulation with Q&P parameters. RESUMEN: Efecto de los parámetros de procesado en el desarrollo microestructural y en las propiedades mecánicas en aceros Q&P.Con el objetivo de evaluar el efecto de los parámetros de procesado en un acero con una composición nominal de 0,25C-1,5Si-3Mn-0,023Al (% masa), éste ha sido sometido a un tratamiento térmico denominado "Quenching and Partitioning" (Q&P), en el que se han variado la temperatura de "quenching", la temperatura de "partitioning" y el tiempo de "partitioning". Como resultado se ha obtenido una microestructura multifásica, la cual ha sido analizada en detalle utilizando difracción de rayos-X (XRD) y de electrones retrodispersados (EBSD). Asimismo, se han medido las propiedades mecánicas de los aceros Q&P mediante ensayos de tracción. La deformación plástica de los aceros Q&P a nivel micrométrico ha sido estudiada mediante ensayos "in situ" en el microscopio electrónico de barrido y la posterior aplicación de la técnica de correlación digital de imágenes. Se ha determinado el efecto de los parámetros de procesado en la microestructura (composición de fases, tamaño y fracción en volumen de los distintos micro constituyentes, textura y contenido en carbono en la austenita retenida). Una vez se han relacionado las propiedades mecánicas, la deformación plástica a nivel micrométrico y la microestructura, se concluye que la partición de la deformación entre fases depende en gran medida de la propia microestructura del acero Q&P, que a su vez puede ser ajustada a través de la manipulación de los parámetros de procesado.

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“…[10,[20][21][22] The present study aims to identify the primary cause behind fissure formation in the steel samples where strong crystallographic texture is present. In case of weak crystallographic texture, other factors such as elongated MnS inclusions and ferrite-pearlite banded structure may contribute to the formation of fissure crack.…”

Section: Introductionmentioning

confidence: 99%

Effect of Local Crystallographic Texture on the Fissure Formation During Charpy Impact Testing of Low-Carbon Steel

Ghosh

Patra

Chatterjee

et al. 2016

Metall Mater Trans A

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The severity of the formation of fissures (also known as splitting or delamination) on the fracture surface of Charpy impact-tested samples of a low-carbon steel has been found to increase with the decrease in finish rolling temperature [1093 K to 923 K (820°C to 650°C)]. Combined scanning electron microscopy and electron back-scattered diffraction study revealed that crystallographic texture was the prime factor responsible for the fissure formation. Through-thickness texture band composed of cube [Normal Direction (ND)kh001i] and gamma [NDkh111i] orientations developed during the inter-critical rolling treatment. Strain incompatibility between these two texture bands causes fissure cracking on the main fracture plane. A new approach based on the angle between {001} planes of neighboring crystals has been employed in order to estimate the 'effective grain size,' which is used to determine the cleavage fracture stress on different planes of a sample. The severity of fissure formation was found to be directly related to the difference in cleavage fracture stress between the 'main fracture plane' and 'fissure plane.' Clustering of ferrite grains having cube texture promoted the fissure crack propagation along the transverse 'fissure plane,' by increasing the 'effective grain size' and decreasing the cleavage fracture stress on that plane.

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Experiments to separate the effect of texture on anisotropy of pipeline steel

Cited by 66 publications

References 19 publications

Fracture Behavior and Delamination Toughening of Molybdenum in Charpy Impact Tests

Fracture Behavior and Delamination Toughening of Molybdenum in Charpy Impact Tests

Effect of Q&P parameters on microstructure development and mechanical behaviour of Q&P steels

Effect of Local Crystallographic Texture on the Fissure Formation During Charpy Impact Testing of Low-Carbon Steel

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