Strength and toughness of clean nanostructured bainite

Peet, M. J.; Fielding, L. C. D.; Hamedany, A. A.; Rawson, M.; Hill, P.; Bhadeshia, H. K. D. H.

doi:10.1080/02670836.2016.1271522

Cited by 21 publications

(7 citation statements)

References 24 publications

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“…Fairchild et al (2000) reported that TiN inclusions caused cleavage cracking in micro alloyed steel at sub- zero conditions. Apparently, few studies confirmed that alloying elements inclusions played a significant role in determination of fracture/notch toughness of welded joints (Peet et al , 2017; Sharifi et al , 2014; Stallybrass et al , 2012). Notch toughness of pipe line steels has been studied using Charpy and drop weight tests.…”

Section: Introductionmentioning

confidence: 99%

The structural integrity of high-strength welded pipeline steels: a review

Singh

Shukla

Kumar

et al. 2020

IJSI

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PurposeThe key purpose of conducting this review is to identify the issues that affect the structural integrity of pipeline structures. Heat affected zone (HAZ) has been identified as the weak zone in pipeline welds which is prone to have immature failuresDesign/methodology/approachIn the present work, literature review is conducted on key issues related to the structural integrity of pipeline steel welds. Mechanical and microstructural transformations that take place during welding have been systematically reviewed in the present review paper.FindingsKey findings of the present review underline the role of brittle microstructure phases, and hard secondary particles present in the matrix are responsible for intergranular and intragranular cracks.Research limitations/implicationsThe research limitations of the present review are new material characterization techniques that are not available in developing countries.Practical implicationsThe practical limitations are new test methodologies and associated cost.Social implicationsThe fracture of pipelines significantly affects the surrounding ecology. The continuous spillage of oil pollutes the land and water of the surroundings.Originality/valueThe present review contains recent and past studies conducted on welded pipeline steel structures. The systematic analysis of studies conducted so far highlights various bottlenecks of the welding methods.

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Section: Introductionmentioning

confidence: 99%

The structural integrity of high-strength welded pipeline steels: a review

Singh

Shukla

Kumar

et al. 2020

IJSI

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“…In a recent study on high-carbon bainitic steel, Peet et al found that the combination of toughness and strength can be improved by reducing the original austenite grain size. When the original austenite grain size of high-carbon bainitic steel was refined from 145 µm to 20 µm, it was found that the strength increased by 40%, and the impact toughness more than doubled [13]. Li et al improved the toughness of high-strength low-alloy steel by refining the original austenite grains, but the contribution of refining the original austenite grains to strength and elongation was relatively limited [14].…”

Section: Introductionmentioning

confidence: 99%

Carbon Atom Distribution and Impact Toughness of High-Carbon Bainitic Steel

Long,

Dai,

Wang

et al. 2024

Coatings

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High-carbon nano bainitic steel is currently a hot research topic. The effect of the matrix’s carbon content and carbon atom distribution on the toughness of high-silicon, high-carbon bainitic steel is studied. The microstructure under an incomplete austenitization process consists of undissolved carbides, bainitic ferrite, and retained austenite. Using this process, the carbon content in bainitic ferrite is relatively low. Under the complete austenitization process, the carbon content in the bainite ferrite in the sample is high, and there is more retained austenite in the blocky type. The sample exhibits high impact toughness under an incomplete austenitization process, which is mainly affected by the low carbon content of bainite ferrite, high coordination ability of retained austenite, and high interface density of microstructure. The EBSD results show that the crack easily propagates between parallel bainite laths with low interface density compared with the high interface density perpendicular to the laths.

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“…Ultra-fine bainite steel, also known as super bainite steel, nano-bainite steel and lowtemperature bainite steel, has become a research hotspot due to its excellent combination of strength and ductility [1][2][3]. Ultra-fine bainitic ferrite plates, 20 nm~1 µm in thickness, within high dislocation densities provide the steel with high strength, and the film-like retained austenite embedded into the plates can absorb microcrack propagation, thereby ensuring its high toughness property [4][5][6]. The impressive combination of ultimate tensile strength (>2 GPa) and ductility (>15%) has been achieved latterly in medium-carbon bainitic steel, indicating that the ultra-fine bainitic steel has huge potential in the field of wear-resistant components such as gears, bearing, and so on [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Fine Bainite in Medium-Carbon High-Silicon Bainitic Steel

Yu,

Wang,

et al. 2024

Materials

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The effects of austenitizing and austempering temperatures on the bainite transformation kinetics and the microstructural and mechanical properties of a medium-carbon high-silicon ultra-fine bainitic steel were investigated via dilatometric measurements, microstructural characterization and mechanical tests. It is demonstrated that the optimum austenitizing temperature exists for 0.3 wt.%C ultra-fine bainitic steel. Although the finer austenite grain at 950 °C provides more bainite nuclei site and form finer bainitic ferrite plates, the lower dislocation density in plates and the higher volume fraction of the retained austenite reduces the strength and impact toughness of ultra-fine steel. When the austenitizing temperature exceeds 1000 °C, the true thickness of bainitic ferrite plates and the volume fraction of blocky retained austenite in the bainite microstructure increase significantly with the increases in austenitizing temperature, which do harm to the plasticity and impact toughness. The effect of austempering temperature on the transformation behavior and microstructural morphology of ultra-fine bainite is greater than that of austenitizing temperature. The prior martensite, formed when the austempering temperature below Ms, can refine the bainitic ferrite plates and improve the strength and impact toughness. However, the presence of prior martensite divides the untransformed austenite and inhibits the growth of bainite sheaves, thus prolonging the finishing time of bainite transformation. In addition, prior martensite also strengthens the stability of untransformed austenite though carbon partition and enhances the volume fraction of blocky retained austenite, which reduces the plasticity of ultra-fine bainitic steel. According to the experimental results, the optimum austempering process for 0.3 wt. %C ultra-fine bainitic steel is through austenitization at 1000 °C and austempering at 340 °C.

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Strength and toughness of clean nanostructured bainite

Cited by 21 publications

References 24 publications

The structural integrity of high-strength welded pipeline steels: a review

The structural integrity of high-strength welded pipeline steels: a review

Carbon Atom Distribution and Impact Toughness of High-Carbon Bainitic Steel

Ultra-Fine Bainite in Medium-Carbon High-Silicon Bainitic Steel

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