Microstructure and Mechanical Properties of X80 Pipeline Steel Joints by Friction Stir Welding Under Various Cooling Conditions

Xie, Guobo; Duan, R.H.; Xue, P.; Y., Z.; Liu, H. L.; Luo, Zongan

doi:10.1007/s40195-019-00940-0

Cited by 28 publications

(11 citation statements)

References 39 publications

(69 reference statements)

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“…The factors that determine the toughness of microalloyed steel are quite complex, mainly involving microstructure, grain size, size, and proportion of the second phase. [ 48 ] The high percentage of HAGB present in the HAZ and BM resulted in higher impact toughness of the experimental steels. However, the presence of a high percentage of HAGB in the WM zone exists with lower impact properties, which is closely related to the size, distribution, and content of inclusions and M/A components in the microstructure.…”

Section: Discussionmentioning

confidence: 99%

Effect of Microstructure on Mechanical Properties of X65MS Welded Pipe Joint

Zhang,

Wei,

Wang

et al. 2024

steel research int.

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The mechanical properties of welded joints have a crucial impact on the safety of pipelines. This article focuses on examining the correlation between the microstructure and mechanical properties of welded joints of X65MS pipeline steel for sour service. The results indicate that the welding thermal cycle forms the microstructure consisting of acicular ferrite, granular bainite, and polygonal ferrite. The hardness across the joint ranges from 210 and 270 HV, peaking within the welded zone and decreasing towards the base metal (BM). At −40 °C, the welded zone shows the lowest impact energy of 53 J, while heat‐affected zones exhibit superior impact toughness exceeding 270 J with the highest impact energy of 326 J. This can be attributed to the exceptionally fine‐grained microstructure, a small quantity of small‐sized martensite‐austenite (M/A) constituents in the heat affected zone. As for the low toughness of the weld, the main factors can be attributed to the presence of large‐sized elongated M/A constituents and inclusions.

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Section: Discussionmentioning

confidence: 99%

Effect of Microstructure on Mechanical Properties of X65MS Welded Pipe Joint

Zhang,

Wei,

Wang

et al. 2024

steel research int.

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“…В процессе горячей прокатки поверхностный слой подвергается сильной сдвиговой деформации из-за трения между поверхностью и валками, что приводит к возникновению множества дислокаций в феррите [10,11]. Движущиеся дислокации переплетаются, образуя новые границы зерен, в результате чего исходные зерна феррита распадаются на множество субкристаллов [13, 25,26]. Фрагментация субкристаллов приводит к более значительной деформации и увеличению внутренней запасенной энергии зерна, способствуя быстрому образованию феррита в поверхностном слое [25,26].…”

Section: производство труб для нефтеи газопроводаunclassified

“…Движущиеся дислокации переплетаются, образуя новые границы зерен, в результате чего исходные зерна феррита распадаются на множество субкристаллов [13, 25,26]. Фрагментация субкристаллов приводит к более значительной деформации и увеличению внутренней запасенной энергии зерна, способствуя быстрому образованию феррита в поверхностном слое [25,26]. Такое сочетание (быстрое охлаждение и сдвиговая деформация) приводит к уменьшению размера зерен в поверхностном слое.…”

Section: производство труб для нефтеи газопроводаunclassified

“…Поэтому когда необходимо получить класс прочности стали ниже К60, то используют ТМО, а если требуется получить прокат с прочности выше К60, то применяют ТМКО. Многие исследователи признают, что с увеличением толщины трубы свыше 27 мм в процессе производства труб остается много нерешенных вопросов по получению однородной структуры в сечении проката и в даль- Анализ работ [21][22][23][24][25][26][27][28] показывает, что при формировании сварного шва в сталях класса прочности К60 с преимущественной структурой феррита и перлита одновременно получить высокие значения прочности и ударной вязкости невозможно. Одним из перспективных направлений разработки высокопрочных трубных сталей является получение кристаллической упорядоченной бейнитной структуры [1,2,[21][22][23][24][25] вместо феррито-перлитной.…”

Section: производство труб для нефтеи газопроводаunclassified

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Review of modern requirements for welding of pipe high-strength low-alloy steels

Karlina,

Kononenko,

Ivancivsky

et al. 2023

Metal Working and Material Science

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For many years, proven arc welding processes have been used to weld large pipes of oil and gas pipelines, the scope of which extends from manual arc welding with stick electrodes to the use of metal orbital welding machines. Introduction reflects that the creation of new steel compositions for oil and gas pipelines is an urgent task to ensure its high reliability. Research Methods. Low-carbon steels with ferrite-perlite structure are usually used in pipe production, but these steels are unable to meet the increased market demands. New grades of steel with bainitic structure are appearing. Results. The failure of welded joints of pipelines made of high-quality steel is becoming a serious problem for the pipeline industry. Discussion. This paper analyzes the characteristics of weld microstructure and its relationship with impact toughness. The prediction of impact toughness based on the microstructural characteristics of weld-seam metals is complicated due to a large number of parameters involved. The common practice linking this property to the microstructure of the last roll of a multi-pass weld turned out to be unsatisfactory because the amount of needle ferrite, the most desirable component, may not always be the main factor affecting the impact toughness. The present review reports on the most representative study regarding the microstructural factor in the welded seam of pipe steels. It includes a summary of the most important process variables, material properties, normative rule, as well as microstructure characteristics and mechanical properties of the joints. Conclusion. It is intended that this review will help readers with different backgrounds, from non-specialist welders or material scientists to specialists in various industrial applications and researchers.

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“…Previous studies indicated that the morphology and size of M/A constituents in high-strength bainitic steels play an important role in impact toughness at low temperatures [25,40]. During impact deformation, strain mismatch between M/A constituents and ferrite matrix exists because of the strength difference, resulting in a stress concentration at the interfaces.…”

Section: Effect Of Microstructure On Mechanical Properties Of the Cgh...mentioning

confidence: 99%

Microstructure-toughness relationship in the simulated CGHAZ of V-N microalloyed X80 pipeline steel

Wang

Gao

Song

et al. 2021

Materials Science and Technology

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The microstructure evolution, hardness and impact toughness in the simulated coarse-grained heat-affected zone (CGHAZ) of a V-N microalloyed X80 pipeline steel were studied. The results indicated that the microstructure mainly consisted of bainitic ferrite, acicular ferrite and granular bainite. The area fraction and size of M/A constituents were increased with increasing heat input. As heat input increased from 15 to 60 kJ cm−1, the hardness gradually decreased from 301 to 243 HV, and impact energy decreased from 284 to 33 J. Hardness in the CGHAZ was not sensitive to heat input. When the heat input exceeded 30 kJ cm−1, the formation of coarse granular bainite and large-sized blocky M/A constituents resulted in the deterioration of impact toughness.

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Microstructure and Mechanical Properties of X80 Pipeline Steel Joints by Friction Stir Welding Under Various Cooling Conditions

Cited by 28 publications

References 39 publications

Effect of Microstructure on Mechanical Properties of X65MS Welded Pipe Joint

Effect of Microstructure on Mechanical Properties of X65MS Welded Pipe Joint

Review of modern requirements for welding of pipe high-strength low-alloy steels

Microstructure-toughness relationship in the simulated CGHAZ of V-N microalloyed X80 pipeline steel

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