Study of the Role of the Interface Coherence on the Hot Deformation Behaviour of Duplex Stainless Steels

Iza-Mendia, A.; Piñol-Juez, A.; Gutiérrez, Isabel; Urcola, J. J.

doi:10.4028/www.scientific.net/kem.127-131.1033

Cited by 3 publications

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“…Because of the sensitivity to secondary phases precipitation and the needs of a balanced microstructure, DSSs have to undergo a solubilizing heat treatment at a temperature that depends on the DSS’s grade to solubilize the secondary phases and to obtain an equal amount of austenite and ferrite. DSSs solidify in a fully ferritic microstructure, at a temperature between 1400 °C and 1500 °C (depending on the DSS grade) and, as the alloy cools down, austenite starts to precipitate from the ferrite matrix with a defined orientation relationship with respect to ferrite such as Kurdjumov–Sachs (K–S) or Nishiyama–Wasserman (N–W) or as incoherent phase boundary [49,50]. Solubilizing heat treatment must be conducted at temperature higher than 1030 °C (depending on the alloy composition) to dissolve the unwanted secondary phases and to obtain an equal volume fraction of austenite and ferrite.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Electroplastic Effect on Four Grades of Duplex Stainless Steels

et al. 2019

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Since the late 1950s, an effect of electrical current in addition to joule heating on the deformation of metals called the Electroplastic Effect (EPE) has been known. It is used nowadays in the so-called Electrically Assisted Forming (EAF) processes, but the understanding of the phenomenon is not very clear yet. It has been found that EPE increases the formability of high stacking fault energy (SFE) materials, while low SFE materials reach fracture prematurely. Since Duplex Stainless Steels (DSSs) possess a microstructure consisting of two phases with very different SFE (low SFE austenite and high SFE ferrite) and they are widely used in industry, we investigated EPE on those alloys. Tensile tests at 5 A/mm2, 10 A/mm2 and 15 A/mm2 current densities along with thermal counterparts were conducted on UNS S32101, UNS S32205, UNS S32304 and UNS S32750. The DSS grades were characterized by means of optical microscopy, X-ray diffraction and their mechanical properties (ultimate tensile strength, total elongation, uniform elongation and yield stress). An increase in uniform elongation for the electrical tests compared to the thermal counterparts as well as an increase in total elongation was found. No differences were observed on the yield stress and on the ultimate tensile strength. Un uneven distribution of the current because of the different resistivity and work hardening of the two phases has been hypothesized as the explanation for the positive effect of EPE.

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Section: Introductionmentioning

confidence: 99%

Investigation of Electroplastic Effect on Four Grades of Duplex Stainless Steels

et al. 2019

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“…The high temperature deformation behaviour of the DSS depends on several phenomena. Many of these phenomena have already been investigated: phase proportion [3], orientation relationship [4], partitioning of alloying elements, strain partitioning [5][6][7], static and dynamic recrystallization and recovery of the constituting phases [8,9]. However it is very seldom that only one parameter is varied thus making the results difficult to interpret.…”

Section: Introductionmentioning

confidence: 99%

Duplex Stainless Steel Microstructural Developments as Model Microstructures for Hot Ductility Investigations

Martin

Véron

Chéhab

et al. 2011

SSP

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Duplex stainless steels (DSS) are alloys made of ferrite and austenite, with a proportion of each phase around 50%. Their main advantage in comparison with other austenitic and ferritic stainless steels is the attractive combination of high strength and corrosion resistance together with good formability and weldability. Unfortunately, DSS often present a poor hot workability. This phenomenon can stem from different factors associated to the balance of the phases, the nature of the interface, the distribution, size and shape of the second phase, and possibly also from difference in rheology between ferrite and austenite. In order to determine the specific influence of phase morphology on the hot-workability of DSS, two austenite morphologies (E: Equiaxed and W: Widmanstätten) with very similar phase ratio have been generated using appropriate heat treatments. It was checked that the latter treatments generate stable microstructures so that subsequent hot mechanical tests are performed on the microstructures of interest. One microstructure consists of a ferritic matrix with austenitic equiaxed islands while the other microstructure is composed of a ferritic matrix with Widmanstätten austenite. The latter morphology corresponds to the morphology observed in as-cast slabs.

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Process: Hot Workability

Gutiérrez

Iza-Mendia

2013

Duplex Stainless Steels

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Study of the Role of the Interface Coherence on the Hot Deformation Behaviour of Duplex Stainless Steels

Cited by 3 publications

References 0 publications

Investigation of Electroplastic Effect on Four Grades of Duplex Stainless Steels

Investigation of Electroplastic Effect on Four Grades of Duplex Stainless Steels

Duplex Stainless Steel Microstructural Developments as Model Microstructures for Hot Ductility Investigations

Process: Hot Workability

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