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, Norberto Sebastián Zappa; Zalazar, Mónica; Surian, Estela

doi:10.1590/0104-9224/si2202.02

Cited by 4 publications

(4 citation statements)

References 12 publications

(21 reference statements)

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“…The formation of the ferrite phase with columnar morphology due to the solidification pattern and three primary austenite morphologies were observed in both conditions, which are grain boundary allotriomorphic, Widmanstätten and intragranular. These morphologies are typically found in duplex and super duplex stainless steels, agreeing with the literature 25,26 , and differ significantly from those observed for the austenitic stainless steel metal welds, including 317L 9,19,27 , because ferrite becomes more stable over a wide temperature range and the solid-state phase transformation from ferrite to austenite stars at a lower temperature.…”

Section: Welded Joints Before Ahtsupporting

confidence: 86%

Effect of the Heat Input and Ageing Treatment on Microstructure and Mechanical Properties of AISI 317L Stainless Steel Dissimilar Welded Joints

2022

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The present work investigated the influence of heat input and aging time on the microstructural characteristics and the mechanical properties of dissimilar AISI 317L austenitic stainless steel welded joints. The AWS ER2209 wire-electrode was used as filler metal, and two different heat input levels were applied (4 and 8 kJ/cm), aiming to verify the influence of this parameter on the deleterious phases precipitation. An aging heat treatment (AHT) was carried out at 700 °C for two different exposure times: 50 and 100 hours. It was observed that aging promoted a refinement of the base metal region, and all delta ferrite was transformed into the sigma phase. The microstructure of the fusion zone (without AHT) presented a significant amount of austenite that precipitated in three different morphologies: allotriomorphific of grain boundary, Widmanstätten, and intragranular. For all the thermally treated samples, it was possible to identify the presence of the σ and χ phases. Additionally, the highest concentration of the χ phase was identified in the samples submitted to 50 hours of AHT. The welding condition and AHT that presented joints with higher mechanical resistance and remarkable toughness were those welded with 4 kJ/cm heat input and with 100 hours of AHT. All welded joints showed an increase in the hardness profile after AHT. The microhardness values showed a good correlation with the microstructure and the mechanical tests so that the highest values of microhardness were observed in welded joints with heat input of 4 kJ/cm and 100 hours of AHT

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Section: Welded Joints Before Ahtsupporting

confidence: 86%

Effect of the Heat Input and Ageing Treatment on Microstructure and Mechanical Properties of AISI 317L Stainless Steel Dissimilar Welded Joints

2022

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“…En la Tabla II se presentan los valores correspondientes al ciclo primario y secundario que definen los parámetros del doble pulso utilizados para todos los cupones. Dichos parámetros fueron seleccionados para garantizar un arco eléctrico estable y definidos en pruebas preliminares realizadas por los autores [13,14]. En todos los casos se soldaron 4 cordones, con respaldo metálico, para completar la junta.…”

Section: A Materiales Y Consumiblesunclassified

Soldadura GMAW-PP disimil entre aceros inoxidables ASS, LDSS y DSS

Maidana¹,

Zappa²

2020

Proceedings of the 18th LACCEI International Multi-Conference for Engineering, Education, and Technology: Engineering, Integrat

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Thanks to the development of different materials (in type and grade) and due to a matter of optimizing the selection of materials (in properties and costs), the concept of dissimilar welding arises, which is associated with welds between different steels. The objective of this work is to study the microstructure and mechanical properties of dissimilar welds between plates of austenitic stainless steels (AISI 304L), lean duplex (LDX 2101) and duplex (DX 2205), by using the semiautomatic process with protection inert gas and double pulsed arc, using as filler material a solid duplex stainless steel wire. For this purpose, three welding coupons (A-L; AD ; L-D) with double pulsed arc were welded and cross sections were made for chemical and microstructural characterization, using optical emission spectrometry, light microscopy and scanning electron microscopy, respectively. For mechanical characterization, hardness sweeps were performed on the cross sections, and tensile specimens were mechanized and tested at room temperature. The obtained mechanical results show a significant decrease in the hardness in the heat-affected zone of the austenitic steel and a greater tensile strength in the dissimilar weld between L-D.

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“…In these areas, pipes, tanks, and other components require a welding process that does not alter their mechanical and corrosion resistance properties. The welding processes that are mostly used in these steels according to the literature are: GMAW (Gas Metal Arc Welding) 9,14,15 , FCAW (Flux-Cored Arc Welding) 16,17 , SAW (Submerged Arc Welding) 18 , SMAW (Shield Metal Arc Welding) 13,19 , and GTAW (Gas Tungsten Arc Welding) 17,[20][21][22] .…”

Section: Introductionmentioning

confidence: 99%

Pitting and Crevice Corrosion Behavior of the Duplex Stainless Steel UNS S32205 Welded by Using the GTAW Process

et al. 2022

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This study investigated the pitting and crevice corrosion behavior of the gas tungsten arc welding (GTAW) process in the UNS S32205 according to industrial parameters. Results revealed that the welding process presented a weld metal chemical composition similar to the base metal and an adequate balance of the austenite and ferrite phases. No relevant variation in the hardness was observed and XRD spectra did not identify the presence of deleterious phases in the weld bead. Cyclic polarization tests revealed similarities between welded and base metal samples (20±2°C, NaCl 3.5% wt.). When comparing the behavior obtained in the crevice, and pitting tests, a decrease in the corrosion resistance was observed in the presence of a crevice former. The SEM-EDS proved that the attack occurred mainly in secondary austenites. Profilometry measurements revealed that the crevice corrosion in the weld region was deeper than in the base metal. However, considering the welded samples as a unit, making no difference between regions: weld metal, HAZ, and base metal, the average crevice corrosion depth was comparable to that of the base metal samples. Finally, it was concluded that the welding process used for the UNS S32205 steel did not harm its corrosion resistance.

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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

Cited by 4 publications

References 12 publications

Effect of the Heat Input and Ageing Treatment on Microstructure and Mechanical Properties of AISI 317L Stainless Steel Dissimilar Welded Joints

Effect of the Heat Input and Ageing Treatment on Microstructure and Mechanical Properties of AISI 317L Stainless Steel Dissimilar Welded Joints

Soldadura GMAW-PP disimil entre aceros inoxidables ASS, LDSS y DSS

Pitting and Crevice Corrosion Behavior of the Duplex Stainless Steel UNS S32205 Welded by Using the GTAW Process

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