Influence of mechanical alloying and extrusion conditions on the microstructure and tensile properties of Low-Cr ODS FeCrAl alloys

Massey, Caleb; Dryepondt, Sébastien; Edmondson, Philip D.; Terrani, Kurt A.; Zinkle, S.J.

doi:10.1016/j.jnucmat.2018.10.017

Cited by 42 publications

(13 citation statements)

References 34 publications

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“…ODS alloys are typically produced in two steps. Very homogeneous powder consisting of the matrix and nano-sized Y 2 O 3 particles is produced by mechanical alloying (MA) and consolidated via hot extrusion, hot isostatic pressing, or spark plasma sintering [ 11 , 12 , 18 , 19 , 20 , 21 ]. Additional thermomechanical processing is often applied to ensure the elimination of porosity and enhance their performance.…”

Section: Introductionmentioning

confidence: 99%

Influence of Hot Consolidation Conditions and Cr-Alloying on Microstructure and Creep in New-Generation ODS Alloy at 1100 °C

et al. 2020

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The coarse-grained new-generation Fe-Al-Y2O3-based oxide dispersion strengthened (ODS) alloys contain 5 vol.% homogeneously dispersed yttria nano-precipitates and exhibit very promising creep and oxidation resistance above 1000 °C. The alloy is prepared by the consolidation of mechanically alloyed powders via hot rolling followed by secondary recrystallization. The paper presents a systematic study of influence of rolling temperature on final microstructure and creep at 1100 °C for two grades (Fe-10Al-4Y2O3 and Fe-9Al-14Cr-4Y2O3 in wt%) of new-generation ODS alloys. The hot rolling temperatures exhibit a rather wide processing window and the influence of Cr-alloying on creep properties is evaluated as only slightly positive.

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Section: Introductionmentioning

confidence: 99%

Influence of Hot Consolidation Conditions and Cr-Alloying on Microstructure and Creep in New-Generation ODS Alloy at 1100 °C

et al. 2020

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“…The resulting CrAZY (Fe-Cr-Al-Zr-Y) powder has previously been extruded into cylindrical rods using hot extrusion at either 1050°C (4H15C) or 1100°C (CrAZY-H1) after thermally annealing the powder for 1 h at the desired extrusion temperature. Details concerning the microstructure and mechanical properties of the as-extruded CrAZY rods can be found in previous communications [28,29]. Inductively coupled plasma optical emission spectroscopy (ICP-OES) was performed by the company DIRATS on the as-milled CrAZY powder used in this study in addition to the as-extruded rods.…”

Section: Specimen Preparationmentioning

confidence: 99%

“…1 h at 850°C for the SM170 heat of 14YWT [27]), the assumption of an isothermal anneal doesn't take into consideration the time required for the powder to heat up to the effective pre-extrusion temperature. To estimate the heating profile that the powder experiences for short-duration annealing treatments in this study, a mild steel can design previously used for the extrusion of low-Cr ODS FeCrAl alloys [28] was packed with ~400 g of powder, and a thermocouple was placed in the center of the powder volume. This can was then heated in the same furnace used for extrusions at Oak Ridge National Laboratory (ORNL) for 1 h at 1000°C to record the powder heating profile as a function of time.…”

Section: Fig 1 Process Diagram For Annealed Powder Specimen Preparamentioning

confidence: 99%

Multiscale investigations of nanoprecipitate nucleation, growth, and coarsening in annealed low-Cr oxide dispersion strengthened FeCrAl powder

et al. 2019

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A major challenge in the design of oxide dispersion strengthened (ODS) FeCrAl alloys is the optimization of the fine-scale particle size distribution that provides both beneficial mechanical properties and irradiation resistance. To address this obstacle, the nucleation, growth, and coarsening of the fine-scale (Y,Al,O) nanoprecipitates within an ODS FeCrAl was studied using atom probe tomography (APT) and small-angle neutron scattering (SANS). Mechanically alloyed Fe-10Cr-6.1Al-0.3Zr+Y2O3 wt.% (CrAZY) powders were heated in-situ from 20-1000°C to capture the nucleation and growth the nanoprecipitates using SANS. Furthermore, CrAZY powders were annealed at 1000°C, 1050°C, and 1100°C at ageing times from 15 min to 500 h followed by either APT or magnetic SANS to study the structure, composition, and coarsening kinetics of the nanoprecipitates. In-situ SANS results indicate nanoprecipitate nucleation and growth at low temperatures (200-600°C). APT results indicate compositions corresponding to the YAG stoichiometry with a possible transition towards the YAP phase for larger precipitates after sufficient thermal ageing. However, magnetic SANS results suggest a defective structure for the nanoprecipitates indicated by deviations of the calculated A-ratio from stochiometric (Y,Al,O) phases. Particle coarsening kinetics follow n=6 power law kinetics, but the mechanism cannot be explained through the dislocation pipe diffusion mechanism. The potential effect of precipitate coarsening during pre-and post-consolidation heat treatments on the irradiation resistance of ODS FeCrAl alloys is discussed with respect to sink strength maximization.

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“…Oxide dispersion strengthened (ODS) ferritic/martensitic steels have been considered as one promising candidate material for first walls in fusion nuclear reactors, owing to their advantages in low radiation resistance and good hightemperature performance [1,2]. Due to the high melting point of oxide nanoparticles, the ODS steels are generally fabricated by mechanically alloying, followed by hot consolidation [3][4][5]. Considering the difference in alloy compositions and microstructure characteristics, the ODS ferritic/martensitic steels can be classified into ODS ferritic steels and ODS martensitic steels [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Residual Ferrite Control of 9Cr ODS Steels by Tailoring Reverse Austenite Transformation

Zhou

Chen

Liu

et al. 2021

Acta Metall. Sin. (Engl. Lett.)

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By tailoring the reverse austenite transformation behavior of 9Cr oxide dispersion strengthened (ODS) ferritic/martensitic steels, the residual ferrite in ODS steels can be controlled. The reverse austenite transformation behavior of ODS steels is closely related to the initial microstructure conditions prior to austenite transformation. For the spark plasma sintered steels, both the amount and size of residual ferrite decrease with increasing heating rate. Nevertheless, high heating rate will increase the amount and size of residual ferrite in annealed ODS steels. As an isothermal treatment is performed at temperatures above Ac 1 , lower isothermal temperature has a more evident effect on the ferrite distribution in spark plasma sintered steels than that in annealed ones.

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Influence of mechanical alloying and extrusion conditions on the microstructure and tensile properties of Low-Cr ODS FeCrAl alloys

Cited by 42 publications

References 34 publications

Influence of Hot Consolidation Conditions and Cr-Alloying on Microstructure and Creep in New-Generation ODS Alloy at 1100 °C

Influence of Hot Consolidation Conditions and Cr-Alloying on Microstructure and Creep in New-Generation ODS Alloy at 1100 °C

Multiscale investigations of nanoprecipitate nucleation, growth, and coarsening in annealed low-Cr oxide dispersion strengthened FeCrAl powder

Residual Ferrite Control of 9Cr ODS Steels by Tailoring Reverse Austenite Transformation

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