Influence of hydrogen on the microstructure and fracture toughness of friction stir welded plates of API 5L X80 pipeline steel

Hoyos, John Jairo; Masoumi, Mohammad; Pereira, Victor Ferrinho; Tschiptschin, André Paulo; Paes, Marcelo Torres Piza; Ávila, Julián A.

doi:10.1016/j.ijhydene.2019.06.210

Cited by 35 publications

(25 citation statements)

References 55 publications

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“…The increase in low angle grain boundaries facilitates the improvement of strength and toughness [8]. However, grain boundaries larger than 15 • have better crack propagation resistance [26,27]. Many scholars have found that high angle grain boundaries in the microstructure could effectively impede crack propagation [15,26].…”

Section: Fracture Toughness Deterioration Of the Joint In H 2 S Conta...mentioning

confidence: 99%

“…However, grain boundaries larger than 15 • have better crack propagation resistance [26,27]. Many scholars have found that high angle grain boundaries in the microstructure could effectively impede crack propagation [15,26]. The results of the grain orientation angle distribution in different regions derived from EBSD revealed that the CG-HAZ had the lowest number of high angle grain boundaries, which to some extent reduced the ability of this zone to hinder crack propagation.…”

Section: Fracture Toughness Deterioration Of the Joint In H 2 S Conta...mentioning

confidence: 99%

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Effect of H2S Corrosion on the Fracture Toughness of the X80 Pipeline Steel Welded Joint

Wang

Deng

et al. 2022

Materials

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To analyze the causes and mechanisms affecting the fracture toughness of X80 pipeline steel welded joints against H2S, the fracture toughness of different zones of X80 pipeline steel welded joints in both air and saturated H2S solution was investigated. The fracture toughness of welded joints degraded significantly in the saturated H2S solution, where the crack tip opening displacement (CTOD) characteristic value in the coarse grain heat-affected zone (CGHAZ) and weld metal (WM) was only 8% and 12% of that in air, respectively. However, the sub-critical grain heat-affected zone (SCHAZ) showed better resistance to H2S corrosion, with the CTOD characteristic value reaching 42% of that in air. The resistance of the welded joint to H2S corrosion was sensitive to microstructures. The grain boundary ferrite (GBF) presented in WM, and the angle of grain boundary orientation in CGHAZ was not conducive to hindering crack propagation. Moreover, the formation of the resultant hydrogen cracks owing to the H2S corrosion also reduced the fracture toughness of the welded joint.

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Section: Fracture Toughness Deterioration Of the Joint In H 2 S Conta...mentioning

confidence: 99%

Section: Fracture Toughness Deterioration Of the Joint In H 2 S Conta...mentioning

confidence: 99%

Effect of H2S Corrosion on the Fracture Toughness of the X80 Pipeline Steel Welded Joint

Wang

Deng

et al. 2022

Materials

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“…Contudo, por efeito da presença de gás sulfídrico (H 2 S) em solução de caráter ácido, ou de íons sulfídricos (HS -) em soluções de caráter neutro e alcalino -conforme reações de dissociação e catódicas apresentadas -ocorre a absorção e difusão de hidrogênio monoatômico pela rede cristalina, em detrimento da formação de hidrogênio gasoso na superfície do aço [41]. Outros compostos que quando combinados ao hidrogênio são altamente danosos para o material são os íons cianeto (CN -), íons arsênio (As 3+ ) [42], trióxido de arsênio (As 2 O 3 ) [43], arseniato de potássio (KH 2 AsO 4 ) [44] e tioureia (CH 4 N 2 S) [45], pois também dificultam a formação de hidrogênio molecular e atuam no sentido de facilitar a difusão do hidrogênio no aço [46]. Uma vez absorvido, ou seja, no interior do material, o hidrogênio atômico pode ser aprisionado nas chamadas armadilhas -ou "traps", em inglês -, que podem ser defeitos metalúrgicos ou imperfeições do aço, a exemplo de inclusões não metálicas, grandes precipitados, discordâncias, sítios intersticiais e contornos de grãos.…”

Section: H S H Hsunclassified

Uma Contribuição para o Entendimento da Influência das Tensões Residuais na Fragilização por Hidrogênio em Aços API 5L

2022

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Resumo Materiais, quando sob carregamento em ambientes agressivos, como é o caso dos aços de tubulações no setor de petróleo e gás, estão sujeitos à fragilização por hidrogênio devido às condições ambientais. A susceptibilidade do tubo a tal fragilização está diretamente relacionada, entre outros fatores, ao nível de tensões residuais presentes; e impõe ao material severas e danosas reduções de propriedades mecânicas. Nesse contexto, devido à necessidade cada vez mais frequente de evitar falhas catastróficas que conduzem a perdas irreparáveis para os seres humanos e o ambiente, são destinados maciços investimentos para o aprimoramento das propriedades mecânicas e grandes esforços para compreender os mecanismos que levam aos danos causados pelo hidrogênio. A compreensão do efeito das tensões residuais originadas pelos diferentes processos ao qual o aço é submetido ainda é bastante escassa e nem sempre há uma unanimidade entre pesquisadores. Diante desta problemática, o presente trabalho, através de uma revisão bibliográfica, objetiva oferecer uma abordagem de como as tensões residuais podem afetar o nível de fragilização nos aços API 5L, bem como uma melhor compreensão dos mecanismos e dos fatores que facilitam a dissolução do hidrogênio na rede cristalina destes materiais.

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“…In contrast, a reversible trap has low binding energy, such as dislocations, 7,9,10 interstitial sites, lath boundaries, grain boundaries, and coherent precipitates 9 . The phenomenon leading to hydrogen atoms severe mechanical properties and degradation of metallic parts is generically known as hydrogen embrittlement (HE) 11‐16 . Various hydrogen embrittlement mechanisms have been described 9,17‐19 .…”

Section: Introductionmentioning

confidence: 99%

The effect of hydrogen on the fracture toughness of friction‐stir welded API 5L X70 pipeline steels

Giarola

Ávila

Cintho

et al. 2022

Fatigue Fract Eng Mat Struct

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The hydrogen embrittlement (HE) leads to severe steel degradation of mechanical properties. The hydrogen atoms diffuse into the steel and get positioned into reversible and irreversible trap sites. The pipe to transport oil and gas needs to be welded to construct long‐distance pipeline projects; thus, friction‐stir welding (FSW) has proven an excellent alternative to joining these pipelines. Therefore, this work assessed and analyzed the influence of hydrogen on the microstructure and fracture toughness of API 5L X70 steel welded by friction‐stir welding. The in‐service conditions were simulated by charging the specimen electrolytically in a 3.5% NaCl water solution with an intensity current of 2 mA·cm−2. According to fracture toughness tests, the base metal (BM) was more affected by hydrogen embrittlement than the friction‐stir zone (SZ), with a fracture toughness reduction of 20% after hydrogen charging. The SZ fracture toughness did not statistically show changes in hydrogen charging by the used times; however, the fracture mechanism changed from ductile to brittle‐like after 4 days of charging. The SZ depicted a better fracture toughness than BM due to the bainitic microstructure, a significant amount of irreversible hydrogen trapping.

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Influence of hydrogen on the microstructure and fracture toughness of friction stir welded plates of API 5L X80 pipeline steel

Cited by 35 publications

References 55 publications

Effect of H2S Corrosion on the Fracture Toughness of the X80 Pipeline Steel Welded Joint

Effect of H2S Corrosion on the Fracture Toughness of the X80 Pipeline Steel Welded Joint

Uma Contribuição para o Entendimento da Influência das Tensões Residuais na Fragilização por Hidrogênio em Aços API 5L

The effect of hydrogen on the fracture toughness of friction‐stir welded API 5L X70 pipeline steels

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