Aplicación del ensayo miniatura de embutido para la evaluación de la tenacidad a temperaturas criogénicas de aceros inoxidables austeníticos envejecidos isotérmicamente

Saucedo‐Muñoz, Maribel L.; Komazaki, Shin‐ichi; Hashida, Toshiyuki; Shoji, Tetsuo; López-Hirata, Vı́ctor M.

doi:10.3989/revmetalm.2003.v39.i5.350

Cited by 13 publications

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“…When it comes to comparing these results with those obtained by other researchers, the most commonly used definition is the DBTT FATT . In our case, this value of γ is larger than that obtained by other researchers with ferritic steels (γ≅0.4), 11,12 though similar to the value obtained by Ruan et al 13 (γ= 0.52 ± 0.12) with quenched and tempered steels with a similar toughness to our AE460 steel.…”

Section: Discussionsupporting

confidence: 87%

“…As for the results of Kameda and Mao, 12 the SPT tests were conducted at a much higher displacement velocity (2 mm/min) than in our tests (0.2 mm/min). This difference in velocity led to significant differences in the values of P y , as has been pointed out by other authors 11 . The values given by Finarelli et al 16 and Campitelli et al 15 for steels that are more similar to ours are 0.38 ± 0.06 and 0.4 ± 0.12, respectively.…”

Section: Discussionsupporting

confidence: 77%

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Use of the small punch test to determine the ductile‐to‐brittle transition temperature of structural steels

Contreras

Rodríguez

Belzunce

et al. 2008

Fatigue Fract Eng Mat Struct

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A B S T R A C TThe small punch test (SPT) consists in punching very small square specimens, measuring 10 × 10 mm 2 and 0.5-mm thickness, until fracture using a 2.5-mm-diameter hemispherical punch. Different specimens of a structural steel were tested from room temperature to cryogenic temperatures in order to determine its ductile-to-brittle transition temperature (DBTT). The DBTT obtained in SPT (DBTT STP ) is much lower than the DBTT obtained by means of Charpy specimens (DBTT CVN ). The variation of the mechanical parameters calculated from the SPTs with temperature was also calculated and the operative fracture micromechanisms defined using a scanning electron microscope.Keywords ductile-to-brittle transition temperature (DBTT); miniature tests; small punch test (SPT); structural steels. N O M E N C L A T U R EA = tension test elongation CVN = Charpy V-notch test d = load point displacement or specimen deflexion DBTT = ductile-to-brittle transition temperature DBTT CVN = ductile-to-brittle transition temperature obtained by means of Charpy-V tests DBTT CVN50% = ductile-to-brittle transition temperature corresponding to the mean value of the upper shelf energy in Charpy-V tests DBTT CVN28J = ductile-to-brittle transition temperature corresponding to an energy value of 28J in Charpy-V tests DBTT CVN41J = ductile-to-brittle transition temperature corresponding to an energy value of 41J in Charpy-V tests DBTT FATT = ductile-to-brittle transition temperature corresponding to a 50% brittle fracture appearance DBTT SPT = ductile-to-brittle transition temperature corresponding to the mean value of the upper shelf energy in SPT tests d f = load point displacement at fracture d max = load point displacement at maximum load P max = maximum load P y = load needed to initiate general plastic deformation SPT = small punch test t = specimen initial thickness

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Section: Discussionsupporting

confidence: 87%

Section: Discussionsupporting

confidence: 77%

Use of the small punch test to determine the ductile‐to‐brittle transition temperature of structural steels

Contreras

Rodríguez

Belzunce

et al. 2008

Fatigue Fract Eng Mat Struct

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“…Este comportamiento indicó, claramente, su susceptibilidad al envejecimiento ayudando a la soldadura a presentar una fractura frágil. Como ejemplo, Saucedo [15] obtuvo una reducción drástica de la tenacidad en un acero envejecido isotérmicamente.…”

Section: 2 2 T Te En Na Ac CI Id Da Ad D a Al L I Im Mp Pa Ac unclassified

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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“…Additionally, TEM image analysis was performed on the micro-structural zones, which revealed the presence of large, nearly rounded, trans-granular nano-particles, as reported in Saucedo et al (2003), which exhibited preferential nucleation sites among dislocations within the ferrite grains. A typical TEM image of the weld bead showed large particles with sizes ranging from 10 to 35 nm in dislocations (Fig.…”

Section: Tem Micro-structural Analysismentioning

confidence: 99%

Effect of natural aging on the microstructural regions, mechanical properties, corrosion resistance and fracture in welded joints on API5L X52 steel pipeline

et al. 2014

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A characterization study was done to analyze how microstructural regions affect the mechanical properties, corrosion and fractography of the Heat Affected Zone (HAZ), weld bead and base metal for pipe naturally aged for 21 years at 30 °C. Results showed that microstructures exhibited damage and consequently decrease in properties, resulting in over-aged due to service. SEM analysis showed that base metal presented coarse ferrite grain. Tensile test indicated that microstructures showed discontinuous yield. Higher tensile strength was obtained for weld bead, which exhibited a lower impact energy in comparison to that of HAZ and base metal associated with brittle fracture by trans-granular cleavage. The degradation of properties was associated with the coarsening of nano-carbides observed through TEM images analysis, which was confirmed by SEM fractography of tensile and impact fracture surfaces. The weld bead reached the largest void density and highest susceptibility to corrosion in H 2 S media when compared to those of the HAZ and base metal. RESUMEN:Efecto del envejecimiento natural sobre la microestructura, propiedades mecánicas, resistencia a corrosión y fractura en uniones soldadas de acero para tubería API5L X52. Se realizó un estudio de caracterización para analizar cómo la microestructura afecta a las propiedades mecánicas, corrosión y fractura de la zona afectada por calor (ZAC), soldadura y metal base para tubería envejecida naturalmente durante 21 años a 30 °C. Los resultados indicaron que las microestructuras presentaron daño y consecuentemente reducción en propiedades mecánicas, como consecuencia del envejecimiento por servicio. El estudio mediante MEB mostró que el metal base presenta grano ferrítico grueso. La prueba de tensión indicó que las microestructuras mostraron fluencia discontinua. La mayor resistencia a la tracción se presentó en la soldadura, la cual alcanzó menor energía de impacto en comparación con la ZAC y metal base asociado con fractura frágil por clivaje transgranular. La degradación de las propriedades está en relación con el engrosamiento de nanocarburos observados a través del análisis de imágenes por MET, lo que se confirmó mediante fractografía por MEB de superfícies de fractura bajo tensión e impacto. La soldadura alcanzó la mayor densidad de microhuecos y la mayor susceptibilidad a la corrosión en un medio conteniendo H 2 S que cuando se compara con la ZAC y metal base.

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Aplicación del ensayo miniatura de embutido para la evaluación de la tenacidad a temperaturas criogénicas de aceros inoxidables austeníticos envejecidos isotérmicamente

Cited by 13 publications

References 0 publications

Use of the small punch test to determine the ductile‐to‐brittle transition temperature of structural steels

Use of the small punch test to determine the ductile‐to‐brittle transition temperature of structural steels

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

Effect of natural aging on the microstructural regions, mechanical properties, corrosion resistance and fracture in welded joints on API5L X52 steel pipeline

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