Role of cold rolled followed by annealing on improvement of hydrogen induced cracking resistance in pipeline steel

Mohtadi-Bonab, M.A.; Eskandari, M.; Szpunar, Jerzy A.

doi:10.1016/j.engfailanal.2018.04.044

Cited by 30 publications

(6 citation statements)

References 32 publications

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“…This was due to the better ductility of this region. This finding contradicts with the results of Mohtad‐Bonab et al who showed that center segregation zone in pipeline steel with hard phases and high hardness has the highest HIC susceptibility. In another study, Ghosh et al reported that type and morphology of inclusions are considered as dominant factors on HIC crack initiation in pipeline steels.…”

Section: Resultscontrasting

confidence: 92%

A Comparative Study of the Role of Hydrogen on Degradation of the Mechanical Properties of API X60, X60SS, and X70 Pipeline Steels

Rahman

Mohtadi-Bonab

Ouellet

et al. 2019

steel research int.

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Three grades of high strength pipeline steel (API X60, X60SS, and X70) are subjected to cathodic hydrogen charging to determine the susceptibility of each steel grade to hydrogen-induced cracking (HIC). The specimens are subjected to tensile stress until failure to generate stress-strain, ductility, and toughness data. The fractured specimens are analyzed using a scanning electron microscope equipped with an EDS detector to determine crack initiation sites for the investigated grades of steel. The expectation that the X60SS steel grade will perform better than other grades is not met, instead it is found that under the cathodic hydrogen charging condition, the X60SS is more susceptible than the other two steel grades with respect to loss of toughness, ductility, and ultimate tensile strength. The presence of Ca-Albased inclusions is the most common along the fracture surfaces. Therefore, these inclusions also act as fairly strong trapping sites that under plastically strained conditions, they can result in fisheye features which severely impact the mechanical properties of the steel specimens.

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Section: Resultscontrasting

confidence: 92%

A Comparative Study of the Role of Hydrogen on Degradation of the Mechanical Properties of API X60, X60SS, and X70 Pipeline Steels

Rahman

Mohtadi-Bonab

Ouellet

et al. 2019

steel research int.

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“…Figure 6 shows some hydrogen-induced cracks in both Steel Grade A and Steel Grade B, and most of such cracks are located in central segregated zone. This is a well-known phenomenon widely investigated in the past, [31][32][33] which is related to the fact that impurities (e.g., P, S, Sb) as well as C and Mn tend to accumulate in the segregated areas, therefore increasing the probability of occurrence of HIC.…”

Section: Discussionmentioning

confidence: 99%

Assessment of Critical Hydrogen Concentration in As‐Cast and Hot‐Rolled Billets in Medium Carbon Steels

Colla

Valentini

2020

steel research int.

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The presence of hydrogen severely affects the mechanical properties of semi‐manufactured and final steel products. Such presence is affected by different factors which show up throughout the whole manufacturing process and varies during the different stages according to both product features and various process parameters. This article presents an experimental methodology to assess the critical hydrogen concentration in as‐cast and hot‐rolled billets in medium carbon steels, which allows highlighting their robustness to hydrogen embrittlement. Such approach is based on a combination of hydrogen‐induced cracking and slow strain rate tensile tests, which are conducted on both as‐cast and hot‐rolled billets samples. The experiments highlight that the hydrogen presence is more critical on the as‐cast semi‐products than on the hot‐rolled billets, which show a higher robustness, as they can tolerate higher values of hydrogen content.

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“…The grain Figure 6 shows the crystallographic characteristics of the tested steel specimens analyzed by EBSD. Blue lines represent low-angle boundaries (2-15 • ), and the red lines correspond to high-angle boundaries (>15 • ) [16]. The grain boundaries between laths in bainite were mainly low-angle grain boundaries, most of which were observed at the 1/4-thickness position of the steel plate.…”

Section: Microstructural Evolution Analysismentioning

confidence: 99%

Effect of Roller Quenching on Microstructure and Properties of 300 mm Thickness Ultra-Heavy Steel Plate

Han

Wang

et al. 2020

Metals

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In this paper, a 300 mm thickness ultra-heavy steel plate was selected as the research object. In addition, special roller quenching equipment and a new testing method were used to measure the quenching temperature curve at different positions of the steel plate. The relationships and corresponding interaction mechanisms between cooling rate, microstructure, and mechanical properties of an ultra-heavy steel plate during roller quenching were investigated. The results indicated that the cooling rate, strength, hardness, and impact energy decreased gradually along the thickness direction of the plate, while the cooling rate, average grain size, and mechanical properties were relatively uniform with little change along the length direction of the plate. The experimental results provide an effective way to further control the microstructure and properties of ultra-heavy steel plates during roller quenching.

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Role of cold rolled followed by annealing on improvement of hydrogen induced cracking resistance in pipeline steel

Cited by 30 publications

References 32 publications

A Comparative Study of the Role of Hydrogen on Degradation of the Mechanical Properties of API X60, X60SS, and X70 Pipeline Steels

A Comparative Study of the Role of Hydrogen on Degradation of the Mechanical Properties of API X60, X60SS, and X70 Pipeline Steels

Assessment of Critical Hydrogen Concentration in As‐Cast and Hot‐Rolled Billets in Medium Carbon Steels

Effect of Roller Quenching on Microstructure and Properties of 300 mm Thickness Ultra-Heavy Steel Plate

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