Microstructure and pitting corrosion in simulated heat-affected zones of duplex stainless steels

Liou, Horng-Yih; Hsieh, Rong-Iuan; Tsai, Wen‐Ta

doi:10.1016/s0254-0584(01)00409-6

Cited by 120 publications

(39 citation statements)

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“…These precipitates resulted in depletion in Cr in the adjacent matrix region. The chromium-depleted zones provide a favorable site for pitting corrosion nucleation, as reported by several authors 6,8,9,14,20,23,[28][29][30][31][32] .…”

Section: Electrochemical Behaviorsupporting

confidence: 53%

Cyclic Polarization Study of Thick Welded Joints of Lean Duplex Stainless Steel for Application in Biodiesel Industry

et al. 2016

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Thick welded joints of UNS S32304 lean duplex stainless steel (LDSS) has been studied in acidified glycerin, a byproduct of biodiesel plants, using cyclic polarization technique. LDSS S32304 thick plates were welded by different processes commonly employed in the fabrication process: shielded metal arc welding, gas metal arc welding and flux cored arc welding. The electrochemical behavior of different weldment zones was characterized. Transmission electron microscopy and scanning electron microscopy (SEM) were used for sample characterization. SEM images showed that the heat affected zone was the most critical zone for pitting corrosion for all samples. The results were associated to the microstructural features of the materials. Generally, the breakdown potential of the top regions of welds was higher in acidified glycerin than the weld root for welds fabricated with two different filler metals. Basically, all the welded samples exhibited similar or higher corrosion resistance, compared with the corresponding base metal.

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Section: Electrochemical Behaviorsupporting

confidence: 53%

Cyclic Polarization Study of Thick Welded Joints of Lean Duplex Stainless Steel for Application in Biodiesel Industry

et al. 2016

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“…Con el fin de mantener una alta resistencia a la corrosión y tenacidad, la zona afectada por el calor (ZAC) de los DSS requiere un contenido de austenita primaria mínimo evitando la formación de Cr 2 N, principalmente en el interior de los granos de ferrita [7,8]. Una forma de estudiar dichas transformaciones y precipitaciones es por medio de la medición del tiempo de enfriamiento entre 1200 y 800 °C (ΔT12/8), que es el intervalo de temperatura típico en el que se forma la austenita y se producen precipitaciones en estos aceros [7,8].…”

Section: Efecto De La Composición Química Del Metal De Aporte Y Del Cunclassified

“…Una forma de estudiar dichas transformaciones y precipitaciones es por medio de la medición del tiempo de enfriamiento entre 1200 y 800 °C (ΔT12/8), que es el intervalo de temperatura típico en el que se forma la austenita y se producen precipitaciones en estos aceros [7,8].…”

Section: Efecto De La Composición Química Del Metal De Aporte Y Del Cunclassified

Efecto de la Composición Química del Metal de Aporte y del Calor Aportado Sobre la Microestructura y las Propiedades Mecánicas de Juntas Soldadas de Aceros Inoxidables Dúplex

Maidana

Zalazar

Surian³

2017

Soldag. insp.

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Este es un artículo publicado en acceso (Open Access) abierto bajo la licencia Creative Commons Attribution NonCommercial, que permite su uso, distribución y reproducción en cualquier medio, sin restricciones siempre que sin fines comerciales y que el trabajo original sea debidamente citado. Soldagem & Inspeção. 2017;22(2) Resumen: Los aceros inoxidables dúplex poseen una microestructura dual (ferrita y austenita) con contenidos aproximadamente iguales y se caracterizan por tener buena soldabilidad, buenas propiedades mecánicas y una alta resistencia a la corrosión generalizada y localizada. Gracias a estas características, estos aceros son los principales materiales a emplear en cañerías con altas exigencias, ampliamente utilizados en varias industrias, principalmente la petroquímica. Dichas propiedades están controladas por la composición química, el equilibrio microestructural y la ausencia de compuestos intermetálicos. El objetivo de este trabajo fue estudiar la influencia de la composición química del metal de aporte y el calor aportado sobre la microestructura y las propiedades mecánicas en juntas soldadas de cañerías de acero inoxidable dúplex. El metal base utilizado fue un acero inoxidable dúplex UNS S31803 de 8" de diámetro y 8,18 mm de espesor y los metales de aporte fueron dos alambres tubulares que depositan aceros inoxidables dúplex y lean dúplex (AWS A5.22: E2209T1-1 y E2209T1-G), mediante el proceso de soldadura semi-automático bajo protección gaseosa, soldados con alto y bajo calor aportado. De cada probeta se extrajeron muestras donde se determinó la composición química, se realizó la caracterización microestructural y se determinaron las propiedades mecánicas (dureza, tracción y Charpy-V).Palabras clave: Acero inoxidable dúplex; Composición química; Soldadura GTAW; Soldadura FCAW; Propiedades mecánicas. Effect of the Chemical Composition of the Filler Metal and the Heat Input on the Microstructure and the Mechanical Properties of Duplex Stainless Steel Welded JointsAbstract: Duplex stainless steels are characterized by good weldability and mechanical properties; they also present a high resistance to general and localized corrosion. They are the main materials when welding pipes with high requirements in different industries, mainly oil and gas. These steels have a microstructure consisting of two phases: 50% austenite and 50% ferrite, approximately, and their properties depend on the maintenance of this ratio and the total chemical composition. The aim of this work was to study the influence of both the chemical composition of the filler metal and the heat input used when welding, on the microstructure and mechanical properties in welded duplex stainless steel pipes. Base metal used was a duplex stainless steel ASTM A790 -UNS S31803 pipe of 8" in diameter and 8.18 mm in thickness. The filler metals were two tubular wires depositing lean duplex and duplex stainless steels (AWS A5.22: E2209T -1 and E2209T1-G respectively), by semi-automatic welding process under shielding gas, with high and low...

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“…It is well known that DSS has some superior features such as excellent corrosion resistance and high strength. DSS also has higher pitting resistance equivalent numbers (PREN) than austenitic stainless steels despite of the lower nickel alloy ratio [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Mechanical Behavior of Super Duplex Stainless Steel with Sigma Precipitation

Kim

Kang

Kim

et al. 2015

Metals

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Experimental studies in various aspects have to be conducted to maintain stable applications of super duplex stainless steels (SDSS) because the occurrence rate of sigma phase, variable temperature and growth direction of sigma phase can influence mechanical performances of SDSS. Tensile tests of precipitated SDSS were performed under various temperatures to analyze mechanical and morphological behavior.

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Microstructure and pitting corrosion in simulated heat-affected zones of duplex stainless steels

Cited by 120 publications

References 10 publications

Cyclic Polarization Study of Thick Welded Joints of Lean Duplex Stainless Steel for Application in Biodiesel Industry

Cyclic Polarization Study of Thick Welded Joints of Lean Duplex Stainless Steel for Application in Biodiesel Industry

Efecto de la Composición Química del Metal de Aporte y del Calor Aportado Sobre la Microestructura y las Propiedades Mecánicas de Juntas Soldadas de Aceros Inoxidables Dúplex

Low-Temperature Mechanical Behavior of Super Duplex Stainless Steel with Sigma Precipitation

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