The effect of large heat input on the microstructure and corrosion behaviour of simulated heat affected zone in 2205 duplex stainless steel

Yang, Yinhui; Yan, Biao; Li, Jie; Wang, Jia

doi:10.1016/j.corsci.2011.07.022

Cited by 155 publications

(64 citation statements)

References 20 publications

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“…Comparison with the results of other studies indicates that the precipitates are Cr 2 N 24 . Figure 3a and 3b shows the results of the TEM analysis of the Cr 2 N formed in the HAZ of as-welded sample.…”

Section: Microstructuresupporting

confidence: 65%

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: Microstructuresupporting

confidence: 65%

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

et al. 2016

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“…The Figure 10-b-e-h show that the precipitation of secondary austenite in form of Widmanstätten needles from ferrite grain boundaries enhanced when deeper in the MZ. Yang et al 25 shown that both GBA and WA had higher chromium contents and PREN (Pitting Resistance Equivalent Number) values than IGA, indicating a better pitting resistance. Gunn 26 and Karlsson et al 27 already had reached these results in their DSS studies.…”

Section: Kn Microstructuresmentioning

confidence: 99%

“…However WA was predominant and it occurs when higher heat input are provided 24 . With coarsening of WA improving the low temperature toughness, affecting corrosion state 25 . The Figure 10-b-e-h show that the precipitation of secondary austenite in form of Widmanstätten needles from ferrite grain boundaries enhanced when deeper in the MZ.…”

Section: Kn Microstructuresmentioning

confidence: 99%

Microstructural behavior of SAF 2205 Duplex Stainless Steel Welded by Friction Hydro Pillar Processing

et al. 2016

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The Friction Hydro-Pillar Process (FHPP) is an innovative process that has been recently studied regarding its possible in situ repair applications. There is still no literature about usage of the FHPP on duplex stainless steel (DSS) base materials to smaller forces than 25 kN. The investigation on DSS processing is crucial due his wide variety of critical uses in pipes and storage structures applied in chemical industry plants, where usual welding processes may lead to safety concerns. The aim of this study is to qualify the processing of SAF 2205 (UNS 31803) duplex stainless steel welded joints using FHPP as feasible repair procedure. For this, the studied samples were welded applying a range of axial forces. The welded joints were characterized by, α/γ phase ratio, intermetallic quantification, austenite spacing measurement, microhardness profile and microstructural qualitative studies. The results showed the efficiency in repair of the FHPP process on the production of DSS joints according with the material recommendations from the standard DNV-RP-F112.

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“…Depois do aquecimento foram programadas as taxas de resfriamento para dois grupos de corpo de prova, segundo o modelo Rykalin 2D. Para um primeiro grupo esse resfriamento foi até 500°C (nesta temperatura considera-se que o processo de formação de austenita foi concluído 7,8 ); seguido de uma têmpera até a temperatura ambiente. O segundo grupo foi resfriado até 250°C (nessa temperatura considerase que os processos de transformações de fases foram finalizados), e seguido de uma têmpera até a temperatura ambiente.…”

Section: Simulação Física Da Zta Na Gleebleunclassified

Análise Microestrutural Da Zta Simulada Na Gleeble Do Aço Duplex Saf 2205

Olaya-Luengas¹,

Morejón²,

Rezende³

et al. 2017

Anais Do Congresso Anual Da ABM

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ResumoA resistência à corrosão e mecânica dos aços inoxidáveis duplex dependem da distribuição de fases, portanto, é fundamental a compreensão das transformações microestruturais que ocorrem na zona termicamente afetada (ZTA) em função do aporte de calor em processos de soldagem. A fim de investigar a evolução microestrutural no aço inoxidável duplex SAF 2205 durante a soldagem, foram simulados na Gleeble dois ciclos térmicos com aporte de calor de 15 e 30 kJ/cm, considerando a temperatura de pico de 1350°C, seguido de têmpera a 500 e 250°C. As microestruturas na condição de como recebido e da ZTA simulada foram caracterizadas através de microscopia óptica (MO) e de microscopia eletrônica de varredura (MEV). Foram utilizadas diferentes técnicas metalográficas para a caracterização da microestrutura e identificadas três diferentes morfologias de austenita: nos contornos de grão, austenita Widmanstätten e a austenita intragranular, assim como diferentes frações volumétricas destas fases. Palavras-chave: Aços inoxidáveis duplex; Simulação física; Zona Termicamente Afetada (ZTA); Metalografia quantitativa. MICROSTRUCTURAL ANALYSIS OF A GLEEBLE SIMULATION OF THE HAZ IN SAF 2205 DUPLEX STAINLESS STEEL AbstractThe corrosion resistance and mechanical properties of duplex stainless steels are dependent on the phases volume fraction. Therefore, it is fundamental to understand the microstructural changes occurring in the heat affected zone (HAZ) as a function of the cooling rates associated with the heat input. In order to investigate the microstructural evolution of the HAZ in duplex stainless steel SAF 2205, a Gleeble simulation of two thermal cycles corresponding to 15 and 30 kJ/cm with peak temperature of 1350°C, followed by quenching at 500 and 250°C were performed. Microstructural characterization of the HAZ in the as-received condition and the simulated HAZ were carried out by optical microscopy (OM) and scanning electron microscopy (SEM). Different metallographic techniques were used to characterize these microstructures namely grain boundary, Widmanstätten and intragranular austenite. Additionally, the volume fraction was measured.

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The effect of large heat input on the microstructure and corrosion behaviour of simulated heat affected zone in 2205 duplex stainless steel

Cited by 155 publications

References 20 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

Microstructural behavior of SAF 2205 Duplex Stainless Steel Welded by Friction Hydro Pillar Processing

Análise Microestrutural Da Zta Simulada Na Gleeble Do Aço Duplex Saf 2205

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