Effect of the annealing temperature on the mechanical properties, formability and corrosion resistance of hot-rolled duplex stainless steel

Fargas, Gemma; Anglada, M.; Mateo, A.

doi:10.1016/j.jmatprotec.2008.04.026

Cited by 109 publications

(74 citation statements)

References 18 publications

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“…Low content of the sigma phase promotes considerable decreasing of toughness; for example, 3% of content causes a reduction of 78% in the absorption of impact energy. The correlation between this phase and impact energy has been reported [7,61,62]. As already stated, sigma phase presents high hardness (around 900 HV) [12][13][14], which can compromise the material toughness [4,7,15].…”

Section: Resultsmentioning

confidence: 96%

“…As already stated, sigma phase presents high hardness (around 900 HV) [12][13][14], which can compromise the material toughness [4,7,15]. According to Fargas et al [61], as the precipitation of sigma phase increases, cracks occur preferentially in the contours of sigma phase particles oriented in the rolling direction. Thermal agings at 800 and 900 • C for 0.25 h lead to a loss in toughness of 31.3% and 54.5%, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Classification of Induced Magnetic Field Signals for the Microstructural Characterization of Sigma Phase in Duplex Stainless Steels

Silva

Marinho

Filho

et al. 2016

Metals

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Duplex stainless steels present excellent mechanical and corrosion resistance properties. However, when heat treated at temperatures above 600 • C, the undesirable tertiary sigma phase is formed. This phase presents high hardness, around 900 HV, and it is rich in chromium, the material toughness being compromised when the amount of this phase is not less than 4%. This work aimed to develop a solution for the detection of this phase in duplex stainless steels through the computational classification of induced magnetic field signals. The proposed solution is based on an Optimum Path Forest classifier, which was revealed to be more robust and effective than Bayes, Artificial Neural Network and Support Vector Machine based classifiers. The induced magnetic field was produced by the interaction between an applied external field and the microstructure. Samples of the 2205 duplex stainless steel were thermal aged in order to obtain different amounts of sigma phases (up to 18% in content). The obtained classification results were compared against the ones obtained by Charpy impact energy test, amount of sigma phase, and analysis of the fracture surface by scanning electron microscopy and X-ray diffraction. The proposed solution achieved a classification accuracy superior to 95% and was revealed to be robust to signal noise, being therefore a valid testing tool to be used in this domain.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Classification of Induced Magnetic Field Signals for the Microstructural Characterization of Sigma Phase in Duplex Stainless Steels

Silva

Marinho

Filho

et al. 2016

Metals

View full text Add to dashboard Cite

show abstract

“…Some of these applications depend on the capability to realize welded joints. However, phase transformations occur during welding in the molten zone (MZ) and in the heat affected zone (HAZ) with detrimental effects on the physical and mechanical properties of DSS [2], in particular the precipitation of secondary phases (SPs), like σ and χ, cause a serious reduction in toughness [3][4][5][6][7][8][9][10][11][12]. This generally derives from incorrect process parameters during either welding or post-welding heat treatments.…”

Section: Introductionmentioning

confidence: 99%

Flat-Top Cylinder Indenter Examination of Duplex Stainless Steel 2205 after Different Heat Treatments

Angella

Fava

Montanari

et al. 2017

Metals

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Abstract:The duplex stainless steel 2205 was heat treated at 750 • C, 850 • C, and 900 • C for increasing durations of up to 10 h. The samples were investigated through light microscopy (LM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) to characterize the volume fraction and morphology of the precipitated secondary phases. The samples were then tested via flat-top cylinder indenter for mechanical characterization (FIMEC) testing to determine the yield stresses that were found to be significantly affected by the different heat treatments. The yield stress evolution with heat treatments resulted in being correlated to both the relative volumes of the secondary phases and the morphology of the σ phase. The FIMEC test proved to be capable of detecting the effects of small amounts of secondary phases on yield stress in DSS 2205 and seems to be a promising technique for industrial applications.

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“…The major aim of the work was to introduce additional hard phases, besides eutectic carbides, such as intermetallic compounds. In stainless steels precipitation of intermetallic compounds, such as the χ phase and the σ phase, reduces toughness and corrosion resistance [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Thermodynamic Study of Selected in-Situ Composites from the Fe-Cr-Ni-Mo-C System

Wieczerzak

Bała

Dziurka

et al. 2016

Archives of Metallurgy and Materials

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The aim of the study was to synthesize and characterize the selected in-situ composites from the Fe-Cr-Ni-Mo-C system, additionally strengthened by intermetallic compounds. The project of the alloys was supported by thermodynamic simulations using Calculation of Phase Diagram approach via Thermo-Calc. Selected alloys were synthesized in an arc furnace in a high purity argon atmosphere using a suction casting unit. The studies involved a range of experimental techniques to characterize the alloys in the as-cast state, including optical emission spectrometry, light microscopy, scanning electron microscopy, electron microprobe analysis, X-ray diffraction and microhardness tests. These experimental studies were compared with the Thermo-Calc data and high resolution dilatometry. The results of investigations presented in this paper showed that there is a possibility to introduce intermetallic compounds, such as χ and σ, through modification of the chemical composition of the alloy with respect to Ni eq and Cr eq . It was found that the place of intermetallic compounds precipitation strongly depends on matrix nature. Results presented in this paper may be successfully used to build a systematic knowledge about the group of alloys with a high volume fraction of complex carbides, and high physicochemical properties, additionally strengthened by intermetallic compounds.

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Effect of the annealing temperature on the mechanical properties, formability and corrosion resistance of hot-rolled duplex stainless steel

Cited by 109 publications

References 18 publications

Classification of Induced Magnetic Field Signals for the Microstructural Characterization of Sigma Phase in Duplex Stainless Steels

Classification of Induced Magnetic Field Signals for the Microstructural Characterization of Sigma Phase in Duplex Stainless Steels

Flat-Top Cylinder Indenter Examination of Duplex Stainless Steel 2205 after Different Heat Treatments

Experimental and Thermodynamic Study of Selected in-Situ Composites from the Fe-Cr-Ni-Mo-C System

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