Effect of artificial aging on the microstructure of weldment on API 5L X-52 steel pipe

Vargas-Arista, B.; Hallen, J.M.; Albiter, A.

doi:10.1016/j.matchar.2006.11.004

Cited by 34 publications

(17 citation statements)

References 9 publications

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“…HAZ presents mainly pearlite grains, shown to be affected by the heat produced during the welding process. According to Vargas-Arista et al [30] SEM analysis, HAZ generated by the welding thermal cycle showed a complex recrystallized microstructure located near to the fusion line, formed by coarse-grained ferrite, acicular ferrite, small discontinuous pearlite colonies, and few bainite grains.…”

Section: Metallographic Featuresmentioning

confidence: 99%

Effect of Microstructure on Hydrogen Diffusion in Weld and API X52 Pipeline Steel Base Metals under Cathodic Protection

Souza

Pereira

Starling

et al. 2017

International Journal of Corrosion

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The aim of this research was to evaluate the influence of microstructure on hydrogen permeation of weld and API X52 base metal under cathodic protection. The microstructures analyzed were of the API X52, as received, quenched, and annealed, and the welded zone. The test was performed in base metal (BM), quenched base metal (QBM), annealed base metal (ABM), and weld metal (WM). Hydrogen permeation flows were evaluated using electrochemical tests in a Devanathan cell. The potentiodynamic polarization curves were carried out to evaluate the corrosion resistance of each microstructure. All tests were carried out in synthetic soil solutions NS4 and NS4 + sodium thiosulfate at 25 ∘ C. The sodium thiosulfate was used to simulate sulfate reduction bacteria (SRB). Through polarization, assays established that the microstructure does not influence the corrosion resistance. The permeation tests showed that weld metal had lower hydrogen flow than base metal as received, quenched, and annealed.

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Section: Metallographic Featuresmentioning

confidence: 99%

Effect of Microstructure on Hydrogen Diffusion in Weld and API X52 Pipeline Steel Base Metals under Cathodic Protection

Souza

Pereira

Starling

et al. 2017

International Journal of Corrosion

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“…Estas condiciones de operación originan cambios en la microestructura, propiedades mecánicas (límite elástico, dureza, ductilidad, tenacidad), tipo de fractura, y probabilidad de fallo después de varios años de servicio [5 y 6] . Este proceso se describe por dos factores: el pico del envejecimiento asociado con la máxima resistencia y precipitación de carburos que interactúan con las dislocaciones originando un endurecimiento por precipitación [4] y el sobreenvejecimiento relacionado con la disminución en resistencia y engrosamiento de carburos con tiempos largos del envejecimiento [7] .…”

Section: I In Nt Tr Ro Od Du Uc Cc Ci Ió óN Nunclassified

“…El efecto que tuvo el envejecimiento acelerado consistió en una disminución significativa en la energía de fractura conforme el tiempo transcurrió, tal como se observa en la gráfica de la figura 2, obteniéndose la disminución mínima de energía a un tiempo de envejecimiento de 500 h. Este mí-nimo fue obtenido como consecuencia del pico del envejecimiento, atribuido al endurecimiento por precipitación de nanopartículas de cementita (Fe 3 C) transgranular [4] . Posteriormente, con tiempos mayores de 500 h, se observó un incremento en la energía Charpy, que puede ser explicado como resultado de la condición de sobreenvejecimiento, debido al engrosamiento de la fase cementita [7] .…”

Section: P Pr Ro Oc Ce Ed DI Im Mi Ie En Nt To O E Ex Xp Pe Er Runclassified

Degradation of impact fracture during accelerated aging of weld metal on microalloyed steel

Vargas-Arista¹,

Hallen²,

Albiter³

et al. 2008

Rev. metal.

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D De eg gr ra ad da ac ci ió ón n d de e l la a t te en na ac ci id da ad d a al l i im mp pa ac ct to o d du ur ra an nt te e e el l e en nv ve ej je ec ci im mi ie en nt to o a ac ce el le er ra ad do o d de e s so ol ld da ad du ur ra a e en n a ac ce er ro o m mi ic cr ro oa al le ea ad do o ( (• •) ) B. Vargas-Arista * , J.M. Hallen ** , A. Albiter *** y C. Ángeles-Chávez *** R Re es su um me en n Se evaluó, mediante el ensayo de impacto Charpy, fractografía y microscopia electrónica de transmisión el efecto del envejecimiento acelerado sobre la tenacidad y fractura de la soldadura en tubería de acero API5L-X52. El envejecimiento se realizó a 250 °C por 1.000 h, con control cada 100 h. Los resultados de impacto indicaron una disminución en la energía de fractura y tenacidad al impacto en función del tiempo del envejecimiento, los cuales se evidenciaron mediante fractografía, por la reducción en la fracción volumétrica de microhuecos por fractura dúctil con el tiempo, favoreciendo la fractura frágil por clivaje transgranular. Sin embargo, a 500 h, se observó la fracción volumétrica mínima debido al pico del envejecimiento. El análisis microestructural evidenció la precipitación de nanocarburos de hierro transgranulares en las muestras envejecidas, la cual se relaciono con la pérdida de tenacidad y cambio en el comportamiento dúctil a frágil, confirmado por fractografía. P Pa al la ab br ra as s c cl la av ve e Soldadura; Envejecimiento acelerado; Tenacidad; Precipitación; Acero microaleado.D De eg gr ra ad da at ti io on n o of f i im mp pa ac ct t f fr ra ac ct tu ur re e d du ur ri in ng g a ac cc ce el le er ra at te ed d a ag gi in ng g o of f w we el ld d m me et ta al l o on n m mi ic cr ro oa al ll lo oy ye ed d s st te ee el l A Ab bs st tr ra ac ct tThe effect of accelerated aging on the toughness and fracture of the longitudinal weld metal of an API5L-X52 linepipe steel was evaluated by Charpy V-notch impact test, fracture analysis and transmission electron microscopy. Aging was performed at 250 °C for 100 to 1000 h. The impact results indicated a significant reduction in the fracture energy and impact toughness as a function of aging time, which were achieved by the scanning electron microscope fractographs that showed a decrease in the vol fraction of microvoids by Charpy ductile failure with the aging time, which favored the brittle fracture by transgranular cleavage. The minimum vol fraction of microvoids was reached at 500 h due to the peak-aged. The microstructural analysis indicated the precipitation of transgranular iron nanocarbides in the aged specimens, which was related to the deterioration of toughness and change in the ductile to brittle behavior. K Ke ey yw wo or rd ds s I IN NT TR RO OD DU UC CC CI IÓ ÓN NLa tubería API 5L se utiliza para el transporte de petró-leo crudo, hidrocarburos y gas natural, en la industria petrolera. Esta tubería presenta unión soldada longitudinalmente obtenida mediante el proceso de soldadura por arco sumergido. La tubería se fabrica de acero microalead...

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“…In addition, pipeline steel is also subjected to a natural aging during a long time period at room temperature, resulting in the changes on the microstructure and mechanical properties after long-term service. 1,2) Therefore, the pipeline steels are critically required to have not only high strength but also excellent deformability in ocean oil exploitation. Besides the marine environment, to meet the other severe environment such as earthquake, landslide, debris flow, etc, the pipeline steels are also required to have excellent deformability.…”

Section: Introductionmentioning

confidence: 99%

Strain Aging Behavior of Microalloyed Low Carbon Seamless Pipeline Steel

Zhang

Liu

2016

ISIJ Int.

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Effect of artificial aging on the microstructure of weldment on API 5L X-52 steel pipe

Cited by 34 publications

References 9 publications

Effect of Microstructure on Hydrogen Diffusion in Weld and API X52 Pipeline Steel Base Metals under Cathodic Protection

Effect of Microstructure on Hydrogen Diffusion in Weld and API X52 Pipeline Steel Base Metals under Cathodic Protection

Degradation of impact fracture during accelerated aging of weld metal on microalloyed steel

Strain Aging Behavior of Microalloyed Low Carbon Seamless Pipeline Steel

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