Effect of Different Thermomechanical Processes on the Microstructure, Texture, and Mechanical Properties of API 5L X70 Steel

Masoumi, Mohammad; Echeverri, Edwan Anderson Ariza; Silva, Cleiton Carvalho; Béreš, Miloslav; Abreu, Hamilton Ferreira Gomes de

doi:10.1007/s11665-018-3276-z

Cited by 5 publications

(4 citation statements)

References 39 publications

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“…It is clearly observed that the application of accelerated cooling just after finish rolling is very effective in producing smaller grained (3.9 -4.1 m µ ) microstructures as compared to the ambient cooling (5.2 -6.4 m µ ). The average grain size values determined in this work were inline with the values reported in the literature [25,26]. For example, in a similar study Masumi et.…”

Section: Microstructural Examinationssupporting

confidence: 90%

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Production of 20 mm Thick API PSL 2 X60 and X70 Grade Plates from a Nb-Ti Microalloyed Steel

Konca

2020

Hittite J. Sci. Eng.

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T here are currently hundreds of thousands of kilometers long petroleum and natural gas pipelines installed worldwide and new lines are being installed continuously [1,2]. As the demand for petroleum and natural gas by the developed and developing countries has increased over time, the pipelines of larger diameter pipes that can work at higher operating pressures were required [2,3]. This necessitated the development of steel plates with higher mechanical properties from which these pipes could be produced [4].Pipeline steels should have high weldability since pipelines are installed by joining pipes to each other by welding. For this reason, pipeline steels must have low carbon content and low carbon equivalent values and this essentially implies ferritic microstructures [5,6]. As a way of having high strength, high ductility and high weldability at the same time, grain size refinement mechanism is utilized in pipeline steels. By decreasing the ferrite grain size, both strength and toughness can be si-Article History:

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Section: Microstructural Examinationssupporting

confidence: 90%

“…For example, in a similar study Masumi et. al found the average ferrite grain size to be around 5-6 m µ without accelerated cooling [25]…”

Section: Microstructural Examinationsmentioning

confidence: 99%

Production of 20 mm Thick API PSL 2 X60 and X70 Grade Plates from a Nb-Ti Microalloyed Steel

Konca

2020

Hittite J. Sci. Eng.

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“…The current view from some investigators is that the structure units affecting toughness are grains with grain boundary misorientation angles greater than 15° in acicular ferrite pipeline steels. In other words, the high-angle grain boundaries (HAGB) with grain boundary misorientation angles greater than 15° are the effective grains, and cracks will be arrested and then deflected by a large angle when encountering HAGB in the process of crack propagation [12,17,18]. However, a large number of experiments show that cracks can also pass straight through HAGB between grains (as shown in Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Influence of Effective Grain Size on Low Temperature Toughness of High-Strength Pipeline Steel

et al. 2019

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In this study, the series temperature Charpy impact and drop-weight tear test (DWTT) were investigated, the misorientation angles among structural boundaries where the cleavage crack propagated were identified, and angles of {100} cleavage planes between adjacent grains along the cleavage crack propagated path were calculated in five directions (0°, 30°, 45°, 60°, and 90° to the rolling direction) of high-grade pipeline steel. Furthermore, the effective grain size (grain with misorientation angles greater than 15°) was redefined, and the quantitative influences of the redefined effective grain size on Charpy impact and DWTT is also discussed synthetically. The results showed that the microstructure presented a typical acicular ferrite characteristic with some polygonal ferrite and M-A islands (composed of martensite and retained austenite), and the distribution of the high-angle grain boundaries were mainly distributed in the range of 45°–65° in different directions. The Charpy impact energy and percent shear area of DWTT in the five directions increased with refinement of the redefined effective grain size, composed of grains with {100} cleavage planes less than 35° between grain boundaries. The ductile-to-brittle transition temperature also decreased with the refining of the redefined effective grain size. The redefined effective grain boundaries can strongly hinder fracture propagation through electron backscattered diffraction analysis of the cleavage crack path, and thus redefined effective grain can act as the effective microstructure unit for cleavage.

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“…Sun et al [36] indicated that the recrystallisation textures by cold rolling and annealing mainly consisted of Brass orientation {110}〈112〉 and partial Goss orientation {110}〈100〉. Some studies have shown that the {110} orientations provided an outstanding combination of tensile strength and ductility [37,38]. As shown in Figure 4(d), the average grain size of the NG/UFG sample was calculated to be 335 nm from the grain size distribution histogram.…”

Section: Resultsmentioning

confidence: 99%

Effect of element segregation on deformation mechanisms of nano/ultrafine-grained 304 stainless steel

Zhao

Liu

et al. 2023

Materials Science and Technology

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The effect of Cr and Ni element segregation on austenite stability and deformation mechanisms of nano/ultrafine-grained 304 stainless steel obtained by cryogenic rolling plus annealing treatment was systematically studied. The results showed that the nano/ultrafine-grained steel had a good combination of strength and ductility (yield strength ∼896 MPa, tensile strength ∼977 MPa, and elongation ∼39.6%). According to the findings, the formation of Cr segregation in the body-centered cubic structure at the intersection of austenite grain boundaries and localised austenite grains with low Ni content reduced the austenite stability of the nano/ultrafine-grained steel and promoted the generation of strain-induced martensite during plastic deformation, resulting in the deformation mechanism dominated by the transformation-induced plasticity effect.

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Effect of Different Thermomechanical Processes on the Microstructure, Texture, and Mechanical Properties of API 5L X70 Steel

Cited by 5 publications

References 39 publications

Production of 20 mm Thick API PSL 2 X60 and X70 Grade Plates from a Nb-Ti Microalloyed Steel

Production of 20 mm Thick API PSL 2 X60 and X70 Grade Plates from a Nb-Ti Microalloyed Steel

Influence of Effective Grain Size on Low Temperature Toughness of High-Strength Pipeline Steel

Effect of element segregation on deformation mechanisms of nano/ultrafine-grained 304 stainless steel

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