Effect of volume fraction of phases and precipitates on the mechanical behavior of UNS S31803 duplex stainless steel

Lacerda, José Carlos de; Cândido, Luiz Cláudio; Godefroid, Leonardo Barbosa

doi:10.1016/j.ijfatigue.2014.12.015

Cited by 68 publications

(33 citation statements)

References 36 publications

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“…Elongated dimples typically indicate shear deformation, clearly evidencing ductile fracture behavior. These observations are in good agreement with Pettersson et al [38] and de Lacerda et al [39] who also reported ductile fracture surface for DSS in the as-received condition (solution annealed). Easy slip activity from ferrite and austenite, and vice versa, is reported for as-received duplex microstructure.…”

Section: Fracture Surface Analysissupporting

confidence: 91%

748 K (475 °C) Embrittlement of Duplex Stainless Steel: Effect on Microstructure and Fracture Behavior

Örnek

Burke

Hashimoto

et al. 2017

Metall Mater Trans A

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22Cr-5Ni duplex stainless steel (DSS) was aged at 748 K (475°C) and the microstructure development correlated to changes in mechanical properties and fracture behavior. Tensile testing of aged microstructures confirmed the occurrence of 748 K (475°C) embrittlement, which was accompanied by an increase of strength and hardness and loss of toughness. Aging caused spinodal decomposition of the ferrite phase, consisting of Cr-enriched a¢¢ and Fe-rich a¢ and the formation of a large number of R-phase precipitates, with sizes between 50 and 400 nm. Fracture surface analyses revealed a gradual change of the fracture mode from ductile to brittle delamination fracture, associated with slip incompatibility between ferrite and austenite. Ferrite became highly brittle after 255 hours of aging, mainly due to the presence of precipitates, while austenite was ductile and accommodated most plastic strain. The fracture mechanism as a function of 748 K (475°C) embrittlement is discussed in light of microstructure development.

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Section: Fracture Surface Analysissupporting

confidence: 91%

748 K (475 °C) Embrittlement of Duplex Stainless Steel: Effect on Microstructure and Fracture Behavior

Örnek

Burke

Hashimoto

et al. 2017

Metall Mater Trans A

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“…However, the sigma phase is more easily generated as the higher level of alloying elements such as Cr and Mo accelerate the kinetics of precipitation [11,12]. Hence, many studies related to effect of sigma phase in DSS and SDSS have been conducted, but most studies of SDSS are focused on only the relationship between the volume fraction of precipitation and the mechanical or corrosive properties [13,14]. However, microcracks have been caused by tensile load in sigma precipitation, it has to be analyzed as the crack has been developed to only vertical direction with tensile loading direction.…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Mechanical Behavior of Super Duplex Stainless Steel with Sigma Precipitation

Kim

Kang

Kim

et al. 2015

Metals

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Experimental studies in various aspects have to be conducted to maintain stable applications of super duplex stainless steels (SDSS) because the occurrence rate of sigma phase, variable temperature and growth direction of sigma phase can influence mechanical performances of SDSS. Tensile tests of precipitated SDSS were performed under various temperatures to analyze mechanical and morphological behavior.

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“…This result was confirmed by quantitative metallography in depth, as shown in Figure 2. Phase volume fraction strongly depends on the annealing temperature, showing a linear trend for the γ and α phases [18]. As the annealing temperature increased from 950 • C to 1050 • C, the elongated γ islands with typical ribbon-like morphology were embedded in the gray etched α matrix and the distribution of the two phases became increasingly homogeneous.…”

Section: Microstructure Evolution During Annealing Treatmentmentioning

confidence: 99%

Section: Microstructure Evolution During Annealing Treatmentmentioning

confidence: 99%

Effects of Micro-Sized Ferrite and Austenite Grains on the Pitting Corrosion Behavior of Lean Duplex Stainless Steel 2101

et al. 2017

Metals

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Abstract:The connection between the austenite transformation and pitting corrosion of lean duplex stainless steel LDX 2101 was investigated at different annealing temperatures in the range 950-1200 • C. Optical microscopy, scanning electron microscopy, and electrochemical techniques were employed in the present work. Results indicated that micro-sized ferrite and austenite grains, formed with the increase of annealing temperature, influenced the pitting corrosion resistance of the studied stainless steel. As the austenite phase transformed into ferrite, the micro-sized ferrite grains were produced in austenite domains with temperature increase from 1000 • C to 1100 • C, especially at 1050 • C. In these conditions, the corrosion resistance of LDX 2101 was reduced by the micro-sized ferrite grains. A further increase of annealing temperature to 1150 • C produced the presence of micro-sized austenite grains in the ferritic phase, due to an incomplete transformation of austenite to ferrite. They represent new sites for severe pitting attacks and therefore the corrosion resistance of LDX 2101 was the weakest. The sample annealed at 1200 • C, with few micro-sized austenite grains in the ferritic matrix, exhibited excellent corrosion resistance. Moreover, a schematic was used to illustrate the pitting corrosion of the samples annealed at different temperatures.

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Effect of volume fraction of phases and precipitates on the mechanical behavior of UNS S31803 duplex stainless steel

Cited by 68 publications

References 36 publications

748 K (475 °C) Embrittlement of Duplex Stainless Steel: Effect on Microstructure and Fracture Behavior

748 K (475 °C) Embrittlement of Duplex Stainless Steel: Effect on Microstructure and Fracture Behavior

Low-Temperature Mechanical Behavior of Super Duplex Stainless Steel with Sigma Precipitation

Effects of Micro-Sized Ferrite and Austenite Grains on the Pitting Corrosion Behavior of Lean Duplex Stainless Steel 2101

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