Microstructure evolution and mechanical properties of briefly heat-treated SAF 2507 super duplex stainless steel welds

Zhang, Ziying; Zhang, Huizhen; Hu, Jun; Qi, Xiaoxiao; Bian, Yaoyao; Shen, Ao; Xu, Pingping; Zhao, Yiangqiang

doi:10.1016/j.conbuildmat.2018.02.143

Cited by 49 publications

(16 citation statements)

References 33 publications

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“…The EDS analysis did not show significant changes in the distribution of the alloying elements for the FZ and HAZ zones, regardless of the interpass temperature. Still, the Cr in the ferrite phase was consistently higher than in the BM, as expected due to its effect as a stabilizer of the ferrite phase [26][27][28][29][30] . XRD analysis for the severest welding condition of this study is presented in Figure 7.…”

Section: Microstructural Characterizationsupporting

confidence: 62%

“…Thus, the final grain structure is achieved for a particular region of the joint following its own path. Therefore, the final grain spatial distribution is a function of the materials properties such as thermal conductivity, specific heat capacity, heat fusion, and heat input distribution [26][27][28][29][30] . Therefore, the grain size and phase volume fractions distribution are coupled phenomena affected by the volumetric heat source shape [25][26][27] , which are dynamically developed during the welding schedule designed to achieve balanced phases and hence welded joints with controlled properties, mainly its mechanical and corrosion resistance.…”

Section: Microstructural Characterizationmentioning

confidence: 99%

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Influence of the Interpass Welding Temperature on Microstructure and Corrosion Resistance of Superduplex Stainless Steel SAF 2507

et al. 2021

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The planning and execution of the adequate welding procedure for the superduplex stainless steel (SAF 2507 SDSS) in multiple passes is a complex technological task since thermal cycling may cause the precipitation of harmful phases, such as the sigma (σ) and chi (χ) phases. For this reason, technical standards limit the maximum interpass temperature (T.I.) in an extremely conservative manner at 100 °C. In order to investigate a possibly wider temperature range for this procedure, SAF 2507-SDSS tubes were subjected to autogenous Tungsten Inert Gas (TIG) welding with interpass temperatures ranging from 150°C to 400°C. The different welding zones were characterized by microscopy, Vickers microhardness, and polarization corrosion tests. The results indicated that in the Fusion Zone (FZ), columnar grains of ferrite were formed surrounded by allotriomorphic austenite (AA), besides intragranular austenite (AI) and Widmanstätten austenite (AW). The heat-affected zone (HAZ) had a lower ferrite content and was composed of equiaxed grains of ferrite, also surrounded by AA, besides AI and AW. Hardnesses varied between HV272 and HV293, regardless of the region or the interpass temperature used. Furthermore, the corrosion resistance has not been significantly affected by the interpass temperatures between 150 °C and 400°C.

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Section: Microstructural Characterizationsupporting

confidence: 62%

Section: Microstructural Characterizationmentioning

confidence: 99%

Influence of the Interpass Welding Temperature on Microstructure and Corrosion Resistance of Superduplex Stainless Steel SAF 2507

et al. 2021

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“…A ausência de porosidades ou bandeamento representa fator relevante junto às juntas soldadas, pois reduzem drasticamente a presença de elementos concentradores de tensões e associações com pites de corrosão que podem comprometer a vida em fadiga em aplicações dinâmicas [2,11,12]. O comportamento macroestrutural encontrado no metal de solda e ZTA foi similar, não detectando-se segregações ou macroestrutura dendrítica [13].…”

Section: Análise Macroestruturalunclassified

Análise mecânica e metalúrgica da união soldada entre um aço inoxidável duplex S32205 com metal de adição de aço inoxidável superaustenítico ER-385-904L

Andrade¹,

Medeiros²,

Biehl³

et al. 2023

Matéria (Rio J.)

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A soldagem de aços dissimilares, como os aços inoxidáveis duplex e superausteníticos é muitas vezes utilizada em aplicações industriais. O efeito da energia de soldagem na zona termicamente afetada (ZTA) e zona de fusão (ZF) apresenta lacunas de conhecimento a serem pesquisadas em relação às propriedades metalúrgicas e mecânicas destes aços. Variações na aplicação da energia da soldagem podem favorecer a presença de maior volume das fases ferrítica ou austenítica, e em casos mais críticos, ocasionar a formação de precipitados deletérios à resistência a corrosão. Este trabalho tem o objetivo avaliar as propriedades metalúrgicas, mecânicas e a resistência à corrosão da soldagem dissimilar composta de aço inoxidável duplex S32205, como metal de base, e aço inoxidável superaustenítico como metal de solda. Verificou-se os efeitos na microestrutura, sensitização e anisotropias com aplicação de diferentes aportes térmicos. Na análise microestrutural foi verificado a formação de constituintes de primeira fase, como a austenita de contorno de grãos (GBA), austenita de witmanstatten (WA), austenita intragranular (IGA) e austenita secundária (γ2). Os valores de microdureza encontrados foram superiores aos referenciados na literatura. Nos ensaios de corrosão, em ambientes com cloretos oxidantes, as amostras apresentaram corrosão por pitting, sendo detectada elevada perda de massa nos corpos de prova. Conclui-se que na ZTA as características metalúrgicas se mantiveram após a variação do aporte térmico e na ZF houve incremento da perda de massa no ensaio de corrosão nas amostras analisadas.

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“…In order to achieve moderate cooling speeds, heat intake must be kept within the higher and lower bounds, and inter-pass temperatures should be held at a minimum (180-200 o C) during conventional multi-pass Welding by fusion. Controlling some welding parameters with a poor accuracy during standard multi-pass welding procedures requires additional man-hours in manufacturing and fabrication [8]. Plasma arc welding (PAW), electron beam welding (EBW), laser beam welding (LBW) and hybrid Laser arc welding (HLAW) may all be used to produce single pass DSS weldments.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Effect of Pulsed Current Micro Plasma Arc Weld Parameters on Uns S32750 Super Duplex Stainless Steel Sheets

Gurugubelli¹,

Kesava²

2022

IJMMT

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In this paper, a 0.33mm thick UNS S32750 super duplex stainless steel sheet is butt welded with welding with a micro-plasma arc. Peak current, base current, pulse width, and pulse rate are regarded welding input factors, whereas the tensile strength and hardness of the welded joint are known as output parameters. 31 distinct combinations of tests are carried out by integrating the response surface method (RSM) with central composite design (CCD) and taking into account four factors and five levels of weld process parameters. The main plots are used to visualize the variance in output responses as a function of weld input parameters. MINITAB software is used to establish mathematical models that take into account linear functions. At a 95% confidence level, ANOVA is used to compare two variables. The dominant parameter is identified using contour plots, and the optimum combination of welding parameters is determined using surface plots. Various welding parameters and their effect on stainless duplex steels have been comprehensively explored in this study.

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Microstructure evolution and mechanical properties of briefly heat-treated SAF 2507 super duplex stainless steel welds

Cited by 49 publications

References 33 publications

Influence of the Interpass Welding Temperature on Microstructure and Corrosion Resistance of Superduplex Stainless Steel SAF 2507

Influence of the Interpass Welding Temperature on Microstructure and Corrosion Resistance of Superduplex Stainless Steel SAF 2507

Análise mecânica e metalúrgica da união soldada entre um aço inoxidável duplex S32205 com metal de adição de aço inoxidável superaustenítico ER-385-904L

Investigation on Effect of Pulsed Current Micro Plasma Arc Weld Parameters on Uns S32750 Super Duplex Stainless Steel Sheets

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