Microstructural Features of Low-Alloy Pipeline Steels that Determine Impact Strength of Welded Joint Heat-Affected Zone

Sudin, V. V.; Степанов, П. П.; Bozhenov, V. A.; Кантор, М. М.; Efron, L.; Zharkov, S. V.; Chastukhin, A. V.; Ringinen, D. A.

doi:10.1007/s11015-021-01184-z

Cited by 3 publications

(4 citation statements)

References 22 publications

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“…Технологические особенности этих методов и оборудование хорошо освещены в литературе. Рассмотрим перспективные технологии [29][30][31][32][33][34][35][36][37][38][39].…”

Section: «определение свариваемости металлический материал считается ...unclassified

“…В работе [38] исследованы микроструктурные механизмы снижения значений ударной вязкости крупнозернистой околошовной зоны двух микролегированных сталей марки К60. Показано, что наибольшее влияние на ударную вязкость околошовной зоны оказывают включения нитрида титана, скалывание которых в пределах крупных бейнитных пакетов может привести к макрохрупкому разрушению образцов.…”

Section: влияние скорости охлаждения на сварку трубunclassified

“…Следовательно, при рассмотрении вероятностного распределения параметров следует применять подход, основанный на надежности. Кроме того, надлежащие требования к коэффициенту согласования прочности металлов кольцевых сварных швов могут быть научно определены путем принятия теории структурной надежности [38,39].…”

Section: влияние скорости охлаждения на сварку трубunclassified

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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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Section: «определение свариваемости металлический материал считается ...unclassified

Section: влияние скорости охлаждения на сварку трубunclassified

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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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“…Compared to the base material, the thermal cycle experiences a series of peak temperatures during welding that can alter the microstructure and properties in the heat-affected zone (HAZ). An important issue currently limiting the development of X80 pipeline steel is the significant difference in microstructure and mechanical performance between welded joints and base materials, with welds becoming the weakest part of X80 long-distance oil and gas pipelines [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nb Content and Second Heat Cycle Peak Temperatures on Toughness of X80 Pipeline Steel

Chen,

Yang,

et al. 2023

Materials

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The microstructure evolution and variation of impact toughness in the heat-affected zone (HAZ) of X80 pipeline steel with different Nb content under different peak temperatures in the secondary thermal cycle were studied through welding thermal simulation, the Charpy impact test, EBSD analysis, SEM observation, and TEM observation in this study. The results indicate that when the peak temperatures of the second pass were lower than Ac1, both X80 pipeline steels had high impact toughness. For secondary peak temperatures in the range of Ac1 to Ac3, both X80 pipeline steels had the worst impact toughness, mainly due to the formation of massive blocky M-A constituents in chain form on grain boundaries. When the secondary peak temperatures were higher than Ac3, both X80 pipeline steels had excellent impact toughness. Smaller grain size and higher proportions of HAGBs can effectively improve the impact toughness. Meanwhile, high Nb X80 pipeline steel had higher impact absorption energy and smaller dispersion. Adding an appropriate amount of Nb to X80 pipeline steel can ensure the impact toughness of SCCGHAZ and SCGHAZ in welded joints.

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Correlation of the Microstructural Factors Influence on the Impact Strength of the Weld Affected Zone of K60* Strength Class Welded Pipes

et al. 2022

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Microstructural Features of Low-Alloy Pipeline Steels that Determine Impact Strength of Welded Joint Heat-Affected Zone

Cited by 3 publications

References 22 publications

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

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

Effect of Nb Content and Second Heat Cycle Peak Temperatures on Toughness of X80 Pipeline Steel

Correlation of the Microstructural Factors Influence on the Impact Strength of the Weld Affected Zone of K60* Strength Class Welded Pipes

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