Effect of Accelerated Cooling Rate and Finish Rolling Temperature on the Occurrence of Arrowhead Markings in Drop-Weight Tear Test of API 5LX70 Linepipe Nb–V–Ti Steel Plate

Amirjani, N.; Ketabchi, Mostafa; Eskandari, M.; Hizombor, M.

doi:10.1007/s12540-020-00841-3

Cited by 13 publications

(3 citation statements)

References 25 publications

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“…High-strength low-alloy (HSLA) steels are highly demanded as structural materials for offshore, shipbuilding, bridges, and pressure vessels because of their excellent combination of strength, weldability, and low-temperature toughness [1][2][3][4][5]. In recent years, the requirement for excellent deformability, such as low yield-to-tensile strength ratio, high uniform elongation, and work hardening exponent, has arisen to increase resistance to progressive or abrupt deformation in HSLA steels [6][7][8][9][10]. Alloy design and heat treatment are important for achieving excellent mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Influence of Heat Treatment on Microstructure and Mechanical Properties of Direct-Quenched Fe-0.06C-0.2Si-2.0Mn Steel

Shin,

Oh,

Hwang

2023

Metals

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In this study, the effect of subsequent heat treatment applied to high-strength low-alloy steel (HSLA) on the structure–property relationships was investigated. Tempering and intercritical annealing processes are introduced to elucidate the influence of subsequent heat treatment on mechanical properties of direct-quenched Fe-0.06C-0.2Si-2.0Mn steel from a microstructural perspective. The tempering process results in a typical tempered martensite with uniformly dispersed cementite, whereas the intercritical annealing process forms a dual-phase microstructure composed of soft ferrite and hard martensite for the direct-quenched steel. In the intercritical annealed steel, a number of mobile dislocations at the interphase (martensite/ferrite) boundary significantly decrease the yield strength, and the large difference in strength between ferrite and martensite enhances work hardening. Charpy V-notch impact test results indicate that the tempering and intercritical annealing processes improved the absorbed energy by more than 100 J compared to the direct-quenched steel at room temperature, and at −50 °C, the intercritically annealed steel exhibited the highest absorbed energy of approximately 140 J. Additionally, the high fraction of high-angle grain boundaries and fine grains of the intercritically annealed steel increase the resistance to cleavage crack propagation, thereby reducing the ductile-to-brittle transition temperature.

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Section: Introductionmentioning

confidence: 99%

Influence of Heat Treatment on Microstructure and Mechanical Properties of Direct-Quenched Fe-0.06C-0.2Si-2.0Mn Steel

Shin,

Oh,

Hwang

2023

Metals

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“…Generally, pipeline steels require higher strength and toughness for the high-pressure transportation of crude oil or natural gas over long distances, and they become thicker and larger to increase the transportation efficiency. [1][2][3][4][5][6][7][8][9] Furthermore, as natural resources are exhausted by industrialization, oil fields in extremely cold areas such as Siberia and Alaska have been actively developed. Because pipeline steels with excellent lowtemperature toughness enable the transport of natural resources in extremely cold areas, many researchers have tried to improve the low-temperature toughness of pipeline steels.…”

Section: Introductionmentioning

confidence: 99%

Correlation of Microstructure with Anisotropy of Low‐Temperature Toughness in Two API X70 Pipeline Steels

Shin

Yoon

et al. 2022

steel research int.

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This study aims to investigate the correlation between the microstructures and the anisotropy of low-temperature toughness for two high-strength API X70 pipeline steels fabricated at different coiling temperatures. The microstructures are characterized using an optical microscope, a scanning electron microscope, and an electron backscattered diffraction analysis, with tensile and Charpy V-notch impact tests also conducted on the steel specimens in various directions relative to the rolling direction. Some pearlites formed by a higher coiling temperature increase the ductile-to-brittle transition temperature (DBTT) by 38 °C in the T-L (transverse-longitudinal) direction. On the other hand, the DBTT of the specimens with the T-L and L-T (longitudinal-transverse) directions (À106.6 and À109.3 °C, respectively) exhibits excellent low-temperature toughness, but the specimen with the D-D (diagonal-diagonal) direction shows the highest DBTT (À65.2 °C). The resulting anisotropy in the low-temperature toughness of the API X70 pipeline steel is discussed from the standpoint of an orientation distribution function analysis in this study. It is suggested the anisotropy of the low-temperature toughness is mainly attributed to the texture components of RD (rolling direction) fibers originating from deformed austenite.

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“…aPi (american Petroleum institute) linepipe steels are required to have relatively high strength so that they can effectively transport natural gas over long distances under high-pressures. Currently, API linepipe steels are increasingly expected to have good deformability characteristics, such as continuous yielding behavior, a low yield-to-tensile ratio, high uniform elongation, and a strain hardening exponent [1][2][3][4][5][6][7][8][9]. These characteristics are generally used to guarantee resistance to unexpected deformation caused by earthquakes, deep sea conditions, and discontinuous permafrost regions.…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

2022

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EffEcts of thE coiling tEmpEraturE and anisotropy on thE tEnsilE propErtiEs of high-strEngth api X70 linEpipE stEEl in this study, the effect of the coiling temperature on the tensile properties of aPi X70 linepipe steel plates is investigated in terms of the microstructure and related anisotropy. Two coiling temperatures are selected to control the microstructure and tensile properties. The aPi X70 linepipe steels consist mostly of ferritic microstructures such as polygonal ferrite, acicular ferrite, granular bainite, and pearlite irrespective of the coiling temperature. in order to evaluate the anisotropy in the tensile properties, tensile tests in various directions, in this case 0° (rolling direction), 30°, 45° (diagonal direction), 60°, and 90° (transverse direction) are conducted. as the higher coiling temperature, the larger amount of pearlite is formed, resulting in higher strength and better deformability. The steel has higher ductility and lower strength in the rolling direction than in the transverse direction due to the development of γ-fiber, particularly the {111}<112> texture.

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Effect of Accelerated Cooling Rate and Finish Rolling Temperature on the Occurrence of Arrowhead Markings in Drop-Weight Tear Test of API 5LX70 Linepipe Nb–V–Ti Steel Plate

Cited by 13 publications

References 25 publications

Influence of Heat Treatment on Microstructure and Mechanical Properties of Direct-Quenched Fe-0.06C-0.2Si-2.0Mn Steel

Influence of Heat Treatment on Microstructure and Mechanical Properties of Direct-Quenched Fe-0.06C-0.2Si-2.0Mn Steel

Correlation of Microstructure with Anisotropy of Low‐Temperature Toughness in Two API X70 Pipeline Steels

Archives of Metallurgy and Materials

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