Microstructural characteristics and corrosion behavior of a super duplex stainless steel casting

Martins, Marcelo Guerra; Casteletti, Luíz Carlos

doi:10.1016/j.matchar.2008.12.010

Cited by 56 publications

(35 citation statements)

References 6 publications

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“…It has been shown that the high alloying content in these steels increases the risk of precipitation of intermetallic phases, with a negative effect on the corrosion resistance and ductility [5][6][7]. For example, it was reported that precipitation of sigma phase determines the formation of Cr-depleted determines the formation of Cr-depleted zones [12,13], leading to a decrease of mechanical and corrosion resistance and finally to premature failure [14][15][16][17][18][19][20]. The microstructural evolution of SDSS after hot deformation and subsequent solution annealing is very important for preventing the formation of deleterious intermetallic phases and, therefore, the easiest solution to achieve the desired properties seems to be a proper control of thermo-mechanical treatment [21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Influence of Solution Treatment Temperature on Microstructural Properties of an Industrially Forged UNS S32750/1.4410/F53 Super Duplex Stainless Steel (SDSS) Alloy

Cojocaru

Şerban

Angelescu

et al. 2017

Metals

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Abstract:In this present study, the influence of solution annealing temperature on microstructural properties of a forged Super Duplex Stainless Steel (SDSS) was investigated by SEM-BSE (Scanning Electron Microscopy-Backscattered Electrons) and SEM-EBSD (Scanning Electron Microscopy-Electron Backscatter Diffraction) techniques. A brief solution treatment was applied to the forged super duplex alloy, at different temperatures between 800 • C and 1100 • C, with a constant holding time of 0.6 ks (10 min). Microstructural characteristics such as nature, weight fraction, distribution and morphology of constituent phases, average grain-size and grain misorientation were analysed in relation to the solution annealing temperature. Experimental results have shown that the constituent phases in the SDSS alloy are δ-Fe, γ-Fe and σ (Cr-Fe) and that their properties are influenced by the solution treatment temperature. SEM examinations revealed microstructural modifications induced by the Cr rich precipitates along the δ/γ and δ/δ grain boundaries, which may significantly affect the toughness and the corrosion resistance of the alloy. Solution annealing at 1100 • C led to complete dissolution of σ (Cr-Fe) phase, the microstructure being formed of primary δ-Fe and γ-Fe. The orientation relationship between δ/δ, γ/γ and δ/γ grains was determined by electron back scattering diffraction (EBSD). Both primary constituent phase's microhardness and global microhardness were determined.

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Section: Introductionmentioning

confidence: 99%

Influence of Solution Treatment Temperature on Microstructural Properties of an Industrially Forged UNS S32750/1.4410/F53 Super Duplex Stainless Steel (SDSS) Alloy

Cojocaru

Şerban

Angelescu

et al. 2017

Metals

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“…The lack of formability of the sigma phase has been attributed to its low fraction or metallic binding [15][16][17]. Even a sigma concentration as low as 3 vol.% has been shown to reduce impact properties from 220 to 20 J at room temperature [18]. As shown in Eq.…”

Section: Resultsmentioning

confidence: 99%

Analysis of Design of Experiments Methodology for Optimization of Pulsed Current GTAW Process Parameters for Ultimate Tensile Strength of UNS S32760 Welds

Yousefieh

Shamanian

Arghavan

2012

Metallogr. Microstruct. Anal.

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This work deals with the improvement of ultimate tensile strength (UTS) of super duplex stainless steel (SDSS, UNS S32760) welds fabricated by pulsed current gas tungsten arc welding (PCGTAW) process. The Taguchi method, a design of experiment technique, was employed to optimize PCGTAW process parameters to improve the UTS of SDSS weldments. The optimum conditions were found to be the second level of pulse current (120 A), second level of background current (60 A), first level of % on time (40) and second level of pulse frequency (3 Hz). Under these conditions, UTS was predicted as 776 MPa that was very close to the observed value of 769 MPa. Analysis of variance (ANOVA) was performed on the measured data and signal-to-noise ratios. As a result of ANOVA, the % on time was found to be the most significant factor affecting the UTS of SDSS welds by percentage contribution of 62.23. The pulse current (21.13%) and the background current (16.18%) had also the next most significant effects on the UTS. The pulse frequency with the 0.46% contribution was insignificant.

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“…The increase in the hardness is directly related to the abundant sigma phase precipitation in the microstructure during the heat treatment. The considerable amount of research has reported to improve the mechanical properties of duplex stainless steel [4][5][6][7][8]. Predicting wear is one of the most important challenges in the whole engineering field.…”

Section: Introductionmentioning

confidence: 99%

“…Wear is defined as the material loss that occurs on the surface of contacting bodies in relative motion. Wear leads to the gradual removal of particles from the contacting surface because of the dependent motion between them [7][8][9][10]. The wear performance of materials is influenced by several factors viz., condition of contact between surface, contact temperature, pressure, frictional forces, coefficient of friction and hardness of the material.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Wear Behaviour Modeling of Super duplex stainless steel AISI 2507 Using Ansys

Davanageri

Narendranath

Kadoli

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract:In this paper the finite element simulation approach has been employed for the work that has been recently carried out by Davanageri et al.(2017). The super duplex stainless steel AISI 2507 material was heat treated at 850°C with different ageing time (30, 60, 90 minutes), followed by water quench. The heat treatment was carried out to encourage the precipitation of inter-metallic secondary sigma phase (σ). The study of dry sliding wear behavior was carried out with the pin-on-disc equipment. The heat treatment and ageing time increases the hardness of the duplex steel, resulting in improved wear resistance. The Archard wear model and finite element software ANSYS WORKBENCH-16 was used to determine the wear volume loss. The specific wear rate or dimensional wear coefficient is the most significant factor in the wear volume calculation and it varies with material and operating parameters. The study shows that frictional coefficient varies with material properties (hardness) at similar operating condition. Finally the results reveal that there is a good agreement that exists between the simulated (FE) values and those of the experimental values.

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Microstructural characteristics and corrosion behavior of a super duplex stainless steel casting

Cited by 56 publications

References 6 publications

Influence of Solution Treatment Temperature on Microstructural Properties of an Industrially Forged UNS S32750/1.4410/F53 Super Duplex Stainless Steel (SDSS) Alloy

Influence of Solution Treatment Temperature on Microstructural Properties of an Industrially Forged UNS S32750/1.4410/F53 Super Duplex Stainless Steel (SDSS) Alloy

Analysis of Design of Experiments Methodology for Optimization of Pulsed Current GTAW Process Parameters for Ultimate Tensile Strength of UNS S32760 Welds

Finite Element Wear Behaviour Modeling of Super duplex stainless steel AISI 2507 Using Ansys

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