Cyclic Softening Behaviour of a Duplex Stainless Steel

Alvarez‐Armas, I.; Evrard, Pierre; Aubin, Véronique; Degallaix-Moreuil, Suzanne

doi:10.3139/120.110042

Cited by 44 publications

(80 citation statements)

References 5 publications

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“…Comparison with the reported results about microstructure during ART-annealing, [20][21][22] the dominant heat treatment in this study is austenization and annealing in the intercritical region (between Ac1 and Ac3), therefore the original microstructure of the steels should consist of austenite laths and ferrite laths, bright-laths should be austenite laths, and black-laths should be ferrite laths. Furthermore, with the following tempering, the phenomena of precipitation or dissolving of carbides and decomposition of austenite should exist and could be observed in the studied steels.…”

Section: Microstructure Evolution During Following Tem-mentioning

confidence: 99%

Tempering Effects on the Stability of Retained Austenite and Mechanical Properties in a Medium Manganese Steel

Zhao

Cao

et al. 2012

ISIJ International

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Tempering effects on the austenite stability and mechanical properties of 0.2C-5Mn steel were investigated in the temperature range from 100°C to 600°C with 1 hour. It was found that tempering doesn't result in a significant change of the austenite plus ferrite duplex structure, which was developed in the previous annealing through austenite reverted transformation, whereas significant decreasing of the austenite fraction and carbon concentration was found in the specimens tempered at 200°C and 500°C due to the precipitation of carbides. Correspondingly tempering slightly deteriorates the ductility when the specimens were tempered at 200°C and 500°C without effects on mechanical properties around 400°C. Based on the analysis of relationship between mechanical properties and retained austenite, it was found that the product of tensile strength to total elongation (Rm*AT) was strongly dependent on the product of the volume fraction and carbon concentration of retained austenite (fA*Cγ). Furthermore, the optimal mechanical properties with tensile strength 1 000 MPa and total elongation 40% could be obtained after tempering at 400°C with 1 hour, which means that galvanization is feasible in the 0.2C-5Mn steel with ferrite and austenite duplex structure.

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Section: Microstructure Evolution During Following Tem-mentioning

confidence: 99%

Tempering Effects on the Stability of Retained Austenite and Mechanical Properties in a Medium Manganese Steel

Zhao

Cao

et al. 2012

ISIJ International

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“…The SAF 2205 may be referred as the most extensively DSS used nowadays, constituting approximately 80% of its total amount consumed 2 . However, due to high chromium (~22%Cr) and molybdenum (~3%Mo) contents and their high diffusion rate in ferrite, DSSs present a tendency to form unwanted secondary phases during exposure to temperatures between 400 and 1000 ºC 3,4 .…”

Section: Introductionmentioning

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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“…In the annealed thermally treated samples, the secondary austenite precipitation has been trigged ( Figure 4D) and it is followed by the precipitates competitive growth with the ongoing of the thermal treatment. At 210 s/mm ( Figure 4E), a static recovery of the ferritic grains is reported to occur and, then, the competitive coarsening of austenitic grains leads the microstructure evolution until 360 s/mm ( Figure 4F) of holding time [26,36]. Moreover, the effect of the deformation by the cold rolling can be detected, observing the distortion of the austenitic grains, which is more marked in the samples experiencing higher strains ( Figure 4G,H).…”

Section: Resultsmentioning

confidence: 76%

“…The thermal generation of lattice defects can be observed in the maximum value of the aluminum diffusion rate associated to the maximum value of soaking time of the annealing thermal treatment [35,52]. The sample annealed for 210 s/mm undergoes a static recovery phenomenon of the ferritic grains, decreasing the number of its internal δ/δ boundaries and defects; then, also the aluminum diffusion rate is strongly reduced [26,36].…”

Section: Discussionmentioning

confidence: 99%

Hot-Dip Aluminizing on AISI F55–UNS S32760 Super Duplex Stainless Steel Properties: Effect of Thermal Treatments

Ciuffini

Barella

Cecca

et al. 2017

Metals

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Abstract:The behavior of super duplex stainless steels AISI F55-UNS S32760 in hot-dip aluminizing process has been studied, investigating the influence of cold working and of different initial microstructures obtained through a preliminary thermal treatment. The microstructural features examined are the secondary austenite precipitation, the static recovery of ferrite and the thermal dissolution of austenite within ferritic matrix. The hot-dip aluminizing temperature has been optimized through sessile drop tests. The treatment has been performed at 1100 • C for 300 s, 900 s and 2700 s. A strong chemical interaction occurs, generating intermetallic compounds at the interface. Molten aluminum interacts exclusively with the ferritic phase due to its much higher diffusivity in this phase coupled with its marked ferrite-stabilizer behavior. Thus, the influence of cold working is not remarkable, since the strains are mainly allocated by austenitic phase. The diffusivity of aluminum increases due to lattice defects thermally generated and, mainly, to influence given by grain boundaries, multiplied by secondary austenite precipitation, which act as short-circuit diffusion paths. Ni and Cr contents in the ferritic matrix have an influence but not highly relevant. Then, the best starting condition of the super duplex stainless steel substrates, to obtain a thick interfacial layer, are the thermal annealing at 1080 • C for 360 s/mm after a solution thermal treatment at 1300 • C for 60 s/mm.

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Cyclic Softening Behaviour of a Duplex Stainless Steel

Cited by 44 publications

References 5 publications

Tempering Effects on the Stability of Retained Austenite and Mechanical Properties in a Medium Manganese Steel

Tempering Effects on the Stability of Retained Austenite and Mechanical Properties in a Medium Manganese Steel

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

Hot-Dip Aluminizing on AISI F55–UNS S32760 Super Duplex Stainless Steel Properties: Effect of Thermal Treatments

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