In Situ X-Ray Diffraction Study of Load Partitioning and Microyielding for the Super Duplex Stainless Steel SAF2507 (UNS S32750)

Peng, Ru Lin; Gibmeier, Jens; Eulert, Sebastian; Johansson, Sten; Chai, Guocai

doi:10.4028/www.scientific.net/msf.524-525.847

Cited by 7 publications

(6 citation statements)

References 7 publications

(16 reference statements)

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“…The yield stresses in each phase of the studied steel were experimentally determined at room temperature and successfully compared with the results of the elastoplastic self-consistent model [1]. Similar "in situ" measurements at room temperature were recently performed by Dakhlaoui et al [2] and Lin Peng et al [3] using the X-ray diffraction method.…”

Section: Introductionmentioning

confidence: 74%

Neutron Diffraction Study of Duplex Stainless Steel during Loading at 200°C

Dakhlaoui

Baczmański

Braham

et al. 2008

MSF

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In this work, the influence of temperature on the mechanical properties of duplex steel is studied by performing monotonic “in situ” tension and compression at 200oC. The lattice strains in both phases were measured using the time-of-flight neutron diffraction method (at the ISIS spallation neutron source, STFC Rutherford Appleton Laboratory, UK). A thermal-elastic selfconsistent model was used to predict the expansion of the interplanar spacings during heating to 200°C. Subsequently, the variation of phase stresses during tensile and compressive loading at room temperature (20°C) and at 200°C were theoretically calculated by the elastoplastic self-consistent model. Comparing the model data with experimental results the critical resolved shear stresses and work hardening parameters were determined individually in each phase of the DSS. Finally, the yield stresses in each phase of the studied steel have been estimated. It was found that both yield points (of austenite and ferrite) are lower at 200°C than those at room temperature.

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Section: Introductionmentioning

confidence: 74%

Neutron Diffraction Study of Duplex Stainless Steel during Loading at 200°C

Dakhlaoui

Baczmański

Braham

et al. 2008

MSF

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“…Second, the γand α-phases exhibit similar behavior in the elastoplastic regime, resulting in relatively weak interphase interactions [54], and both phases deform simultaneously [55,56]. However, the following discussion suggests that these results are universal.…”

Section: Possible Explanations For Swirling Patternmentioning

confidence: 88%

Principles and Technical Parameters of High‐Pressure Torsion

Valiev¹,

Zhilyaev²,

Langdon³

2013

Bulk Nanostructured Materials

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“…In fact, ferrite matrix percolates the entire microstructure and has a lower electrical resistivity compared to austenite [65]; hence, an uneven distribution of the electrical current can be expected. The different work hardening rate of the two phases has to be taken into account as well: austenite is subjected to higher deformation, hence higher work hardening rate owing to its low SFE compared to ferrite is expected [66]. Since ferrite has a higher yield stress than austenite, most of the plastic deformation initiates in the austenitic grains, increasing the dislocation density of that phase, which affects the resistivity as well.…”

Section: Discussionmentioning

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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In Situ X-Ray Diffraction Study of Load Partitioning and Microyielding for the Super Duplex Stainless Steel SAF2507 (UNS S32750)

Cited by 7 publications

References 7 publications

Neutron Diffraction Study of Duplex Stainless Steel during Loading at 200°C

Neutron Diffraction Study of Duplex Stainless Steel during Loading at 200°C

Principles and Technical Parameters of High‐Pressure Torsion

Investigation of Electroplastic Effect on Four Grades of Duplex Stainless Steels

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