Interaction between austein-ferrite phases on passive performance of 2205 duplex stainless steel

Cheng, Xuequn; Wang, Yi; Li, Yong; Dong, Chaofang

doi:10.1016/j.jmst.2018.02.020

Cited by 81 publications

(28 citation statements)

References 46 publications

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“…This research shows that, in agreement with the literature [2,5,10], aging DSS 2304 samples between 650 and 850 • C induces the precipitation of chromium and molybdenum carbides ( Figure 2), and perhaps nitrides (Figure 9). The nucleation of these precipitates occurs essentially at the α/γ interface, acting as a connection between Cr-rich ferrite (which is also relatively rich in Mo) and C-rich austenite [10,47,48]. Then, carbides grow into the ferrite phase, because of the higher diffusivity of Cr and Mo in this phase [49].…”

Section: Discussionmentioning

confidence: 99%

Resistance of Thermally Aged DSS 2304 against Localized Corrosion Attack

Zanotto

Grassi

Balbo

et al. 2018

Metals

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In this paper, the effects of thermal aging in the 650–850 °C range on the localized corrosion behaviour of duplex stainless steel (DSS) 2304 was investigated. Pitting corrosion resistance was assessed by pitting potential (Epitt) and critical pitting temperature (CPT) determination, while the degree of sensitisation (DOS) to intergranular corrosion (IGC) was evaluated by double loop electrochemical potentiokinetic reactivation (DL-EPR). The susceptibility to stress corrosion cracking (SCC), evaluated in standard NACE TM-0177 solution at pH 2.7 and 25 °C, with the addition of S2O32− at 10−3 M, resulted in general good agreement with pitting and IGC behaviour. In fact, as-received DSS 2304 aged for 5 min at 650 °C or 750 °C presented a high resistance to localized corrosion. The alloy corrosion behaviour was severely impaired with an aging time of 60 min at 650 °C and of 10 or 60 min at 750 °C, due to the precipitation of finely distributed M23C6-type chromium carbides at ferrite/austenite interphases, which determined the formation of chromium and molybdenum depleted areas. The behaviour of samples aged at 850 °C also depended on the aging time, but, at 60 min, the rediffusion of passivating elements produced a recovery of the alloy resistance to pitting, IGC and SCC.

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Section: Discussionmentioning

confidence: 99%

Resistance of Thermally Aged DSS 2304 against Localized Corrosion Attack

Zanotto

Grassi

Balbo

et al. 2018

Metals

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“…17 Quando o ensaio de EIS ocorre no potencial de passivação, a formação do filme passivo na interface eletrodo/eletrólito ocorre sobre toda superfície exposta, não sendo mais necessário diferenciar as áreas de contornos de grão empobrecidas em cromo das regiões não-depletadas, a área a ser considerada é uniforme e referente a área do filme. Deste forma, os resultados para os ensaios de EIS realizados no potencial de passivação indicam diretamente a qualidade do filme passivo que recobre a superfície, 22 podendo os parâmetros de simulação serem avaliados de maneira solitária.…”

Section: Amostrasunclassified

Comparison Between the Parameters Obtained by Electrochemical DL EPR Techniques and Electrochemical Impedance Spectroscopy in the Corrosion Resistance of Duplex Stainless Steel UNS 31803

et al. 2018

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Helker, P. V. T.;* Macêdo, M. C. S.; Tavares, S. S. M.; Pardal, J.M.;Ponzio, E. A.; Silva, C. H. P Rev. Virtual Quim., 2018, 10 (5), 1516-1530. Data de publicação na Web: 1 de outubro de 2018Abstract: Stainless steels have wide use in several industrial segments, but when subjected to temperatures above 300 °C can give rise to new phases and precipitates that modify the original characteristics of the material, such as corrosion resistance. This article aims to compare the electrochemical parameters related to localized corrosion obtained through the electrochemical techniques of DL-EPR and electrochemical impedance spectroscopy (EIS). For this, samples of stainless steel duplex UNS S31803 were heat treated at temperatures of 645 °C, 820 °C and 960 °C for 12 hours. These treatments resulted in the precipitation of intermetallic phases, especially the sigma phase. The corrosion tests were conducted in a 2 M H2SO4+ 0.5 M NaCl + 0.01 M KSCN solution, the EIS test being conducted on the open circuit potential (OCP) and on the passivation potential. The presence of intermetallic and sigma phase caused the sensitization of the treated samples at 645 and 820 °C, which was not observed in the treated sample at 960 °C, which presented the recovery effect. The results of each technique were compared and a good relationship between EIS and DL-EPR was observed for the test conducted in the passivation potential, whereas the test conducted in the OCP potential did not match the techniques when comparing the shape simulation parameters isolated

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“…The excellence of these properties comes from the high chromium content that these alloys contain, as well as small but very useful Molybdenum and nitrogen contents [24], which can be improved and of use when an outstanding pitting resistance equivalent number is required [25]. Due to the interest in the combination of these two important properties, these alloys have as preferred applications the petrochemical and chemical industries, nuclear power generators, water desalination stations, marine infrastructures, paper industry, heat exchangers, among many others [26,27]. However, some properties, which are very appreciated regarding the applications for which they are intended, have adverse consequences concerning their processing, for example, in machining.…”

Section: Introductionmentioning

confidence: 99%

Machining GX2CrNiMoN26-7-4 DSS Alloy: Wear Analysis of TiAlN and TiCN/Al2O3/TiN Coated Carbide Tools Behavior in Rough End Milling Operations

et al. 2019

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In the last decade, it has been common to observe a competition between coatings achieved via physical vapor deposition (PVD) and chemical vapor deposition (CVD) techniques on cutting tools used in machining processes. The tool’s substrate material can immediately condition the coating process selection. However, there are also materials capabe of adapting to any of the coating processes. Hence, the capabilities demonstrated by a given coating when created with one technique or another are usually different due to the intrinsic characteristics of each coating process, such as temperature and stress levels. In this work, to study the machining behavior of a super duplex stainless steel, PVD- and CVD-coated tungsten carbide inserts with different coatings were used in order to identify the wear mechanisms that affect each of the coatings and the workpiece’s surface quality, evaluated through different roughness parameters. The vibration level produced throughout the various tests was also registered in an attempt to associate the type of coating or insert failure with the level of vibrations generated in the CNC (Computer Numeric Control) machining spindle. This allowed us to conclude that the tools coated with TiAlN via PVD showed better wear behavior, as well as creating workpiece surfaces with less roughness. Thus, it was clear that this coating presents strong advantages in the machining of the super duplex stainless steel chosen for this work, being an innovative work due to the combination of materials used and the approach in terms of vibration analysis applied to milling.

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Interaction between austein-ferrite phases on passive performance of 2205 duplex stainless steel

Cited by 81 publications

References 46 publications

Resistance of Thermally Aged DSS 2304 against Localized Corrosion Attack

Resistance of Thermally Aged DSS 2304 against Localized Corrosion Attack

Comparison Between the Parameters Obtained by Electrochemical DL EPR Techniques and Electrochemical Impedance Spectroscopy in the Corrosion Resistance of Duplex Stainless Steel UNS 31803

Machining GX2CrNiMoN26-7-4 DSS Alloy: Wear Analysis of TiAlN and TiCN/Al2O3/TiN Coated Carbide Tools Behavior in Rough End Milling Operations

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