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

Martin, Guilhem; Véron, M.; Chéhab, B.; Fourmentin, R.; Mithieux, Jean‐Denis; Yerra, Sampath Kumar; Delannay, Laurent; Pardoen, Thomas; Bréchet, Y.

doi:10.4028/www.scientific.net/ssp.172-174.350

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…1(a). The as-received material was annealed using an appropriate heat treatment in order to generate an equiaxed austenite morphology with an average grain size equal to about 60 μm [34], see Fig. 1(b).…”

Section: Methodsmentioning

confidence: 99%

Characterization of the High Temperature Strain Partitioning in Duplex Steels

et al. 2012

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International audienceA microgrid technique has been developed for the analysis of the high-temperature micro-scale strain distribution between ferrite and austenite into duplex stainless steels. The local strain is measured by micro-extensometry using square microgrids engraved on flat specimens by electro-lithography. The sample with microgrids on the surface and preliminary imaged with high definition scanning electron microscope (SEM), is inserted in a plane strain compression specimen to be deformed under conditions representative of hot rolling. After deformation, the sample is extracted from the compressed block and the surface is again analyzed by SEM and image processing to determine the strain field. The strain is heterogeneously distributed with a strong localization of the deformation, in the form of shear bands located within the ferrite and at the vicinity of the austenite/ferrite interphase boundaries. These strain maps provide useful informations about the rheology of the phases as well as about the local conditions at the origin of the damage proces

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Section: Methodsmentioning

confidence: 99%

Characterization of the High Temperature Strain Partitioning in Duplex Steels

et al. 2012

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“…erefore, DDSs are widely used in chemical, marine, paper, water treatment, transport, and energy industries. However, DDSs often have poor hot workability and the use of DDSs is restricted [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Strain Rate on Hot Ductility of a Duplex Stainless Steel

Wang

2019

Advances in Materials Science and Engineering

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Duplex stainless steels (DSSs) often have bad hot workability. In this study, specimens of 2205 DSS were hot tensioned over a strain rate range from 0.005 s -1 to 50 s -1 to examine the hot ductility. e crack morphology was observed, and the dependence of hot ductility on the strain rate was analyzed. From 0.005 s -1 to 0.5 s -1 , both the total elongation and the reduction in area increased with the strain rate. e reduction in area exhibited a small decrease when the strain rate was greater than 0.5 s -1 . More than 85% of cracks formed between the ferrite and austenite, and no less than 70% of crack tips propagated between the ferrite and austenite. When the strain rate was increased from 0.005 s -1 to 0.5 s -1 , dynamic recrystallization was promoted in the austenite, and the number fraction of low-angle grain boundaries in the ferrite was improved. e higher strain rate reduced the difference between ferrite and austenite in hardness, which improved the hot ductility. For 2205 DDS, the suggested strain rate is 0.5 s -1 and above to avoid surface and edge cracking during hot forging or hot rolling. e findings will be of value for the understanding of hot ductility of DSSs and other dual-phase alloys.

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