Study of Pipeline Steels with Acicular Ferrite Microstructure and Ferrite-bainite Dual-phase Microstructure

Zuo, Xunwei; Zhou, Zhengyue

doi:10.1590/1516-1439.256813

Cited by 34 publications

(15 citation statements)

References 19 publications

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“…In general, with increased cooling rate the nature and morphology of ferrite alters from polygonal to plate-type or elongated and subsequently to lath and acicular type ferrite 17 . UFC process promotes the formation of acicular ferrite (Fig.…”

Section: Discussionmentioning

confidence: 99%

The Analysis of the Microstructure and Mechanical Properties of Low Carbon Microalloyed Steels after Ultra Fast Cooling

Tian

Wang

et al. 2017

Mat. Res.

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In this paper, two low carbon microalloyed steels, named as steel A and steel B, were fabricated by ultra fast cooling (UFC). In both steels, the microstructures containing quasi polygonal ferrite (QF), acicular ferrite (AF) and granular bainite (GB) can be obtained by UFC process. The amount of AF in steel B is more than that in steel A. The size and distribution of precipitates (Nb/Ti carbonitrides) in steel B are finer and more dispersed than those of in steel A due to relatively low finish cooling temperature. The mechanical properties of both steels are effectively enhanced by UFC process. UFC process produces low-temperature transformation microstructures containing a significant amount of AF. The mechanical properties of steel B were more satisfactory than those of steel A due to the finer average grain size, the greater amount of the volume fractions and smaller size of secondary phases.

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Section: Discussionmentioning

confidence: 99%

The Analysis of the Microstructure and Mechanical Properties of Low Carbon Microalloyed Steels after Ultra Fast Cooling

Tian

Wang

et al. 2017

Mat. Res.

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“…The microstructure of X52 steel was generally uniform with equiaxial polygonal grains, although certain band elongation was observed. Steel 17G1S had a more dispersed acicular ferrite-perlite structure with massive ferrite regions, as well as granular ferrite and bainitic ferrite with high density dislocation and second phases in the matrix (40).…”

Section: Application Of the Trides Methods For The Design And Developmmentioning

confidence: 99%

TriDes – a new tool for the design, development and non-destructive evaluation of advanced construction steels

et al. 2016

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Design and development of advanced steel types require establishing an optimal combination of mechanical strength, resistance to hydrogen degradation and durability, among others; however, the available tools for assessing some of these properties are limited. A novel tool for supporting the design and development of steel types was therefore created. This tool, called TriDes, is based on the phenomenon of mechanically stimulated gas emission and allows for determining mechanical properties and hydrogen concentration locally, with high spatial resolution and during different phases of the service life of construction steel elements. Its applicability to the development of pipe steel with improved durability, as well as to steel types used in marine environments, has been investigated. RESUMEN: TriDes -una nueva herramienta para el diseño, desarrollo y evaluación no destructiva de aceros avanzados de construcción.El diseño y desarrollo de acero avanzado requiere establecer una combinación óptima de resistencia mecánica, resistencia a la degradación por hidrógeno y la durabilidad, entre otras. Sin embargo, las herramientas disponibles para evaluar experimentalmente algunas de estas propiedades son limitadas. Por lo tanto se creó una nueva herramienta, llamada TriDes. Esta técnica está basada en un principio físico distinto de los que se usan en las técnicas establecidas y combina la caracterización de hidrógeno en el acero en y la caracterización mecánica y/o tribológica. La técnica es portatil lo que permite determinar concentración local de hidrógeno con alta resolución espacial durante todo el ciclo de vida de elementos fabricados en acero y además evaluar la dureza y resistencia al desgaste del acero. Se ha investigado la capacidad de la técnica para el desarrollo de aceros para aplicaciones en gasoductos y construcciones marinas.

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“…One type of such steels is a bainite/MA type, its microstructure consists of bainite with inclusions of martensite‐austenite (MA) islands. Different technologies, such as on‐line heat and intercritical processes as well as holding in the bainitic transformation region, can be used for such steels production . Each of these technologies is based on the principle of acceleration and increase of carbon diffusion from ferrite or bainite into the austenite.…”

Section: Introductionmentioning

confidence: 99%

Effect of hot Rolling and Cooling Conditions on the Microstructure, MA Constituent Formation, and Pipeline Steels Mechanical Properties

Kabanov

Korpała

Kawalla

et al. 2018

steel research int.

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Two types of pipeline steels differentiated by the content of aluminum and silicon are produced during the pilot plant test with varying rolling temperature and accelerated cooling rate. Microstructures, MA constituent morphology, and mechanical properties of such materials are compared using digital and electron microscopy, tensile, and Charpy impact tests. Results show that low finishing rolling temperature stimulates MA constituent refinement. Cooling rate increase leads to MA constituent amount increase and refinement. Alloying with aluminum significantly stabilizes austenite and leads to MA constituent amount and size increase. Higher MA constituent amount has in most cases positive effect on plasticity without strength and impact toughness degradation.

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Study of Pipeline Steels with Acicular Ferrite Microstructure and Ferrite-bainite Dual-phase Microstructure

Cited by 34 publications

References 19 publications

The Analysis of the Microstructure and Mechanical Properties of Low Carbon Microalloyed Steels after Ultra Fast Cooling

The Analysis of the Microstructure and Mechanical Properties of Low Carbon Microalloyed Steels after Ultra Fast Cooling

TriDes – a new tool for the design, development and non-destructive evaluation of advanced construction steels

Effect of hot Rolling and Cooling Conditions on the Microstructure, MA Constituent Formation, and Pipeline Steels Mechanical Properties

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