Journal ArticleDOI
Finite element method simulation of the hot extrusion of a powder metallurgy stainless steel grade
D. Sornin,A. Karch,D. Nunes +2 more
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In this paper, the authors used the Finite Element Method to simulate the co-extrusion of a powder Metallurgy (PM) grade in a soft steel can, and determined the PM steel grade behavior law by hot torsion tests, taking into account temperature and strain-rate sensitivity.Abstract:
Oxides Dispersed strengthened (ODS) stainless steels are foreseen for fuel cladding tubes in the coming generation of fission nuclear reactors. In spite of a ferritic matrix those steels present a convenient creep behavior thanks to very fine oxides dispersion. Those grades are currently obtained by Powder Metallurgy (PM). After mechanical alloying with the oxide, the powder is commonly consolidated by Hot Isostatic Pressing (HIP) or Hot Extrusion (HE). The control of microstructure after extrusion is a key issue for this grade regarding service conditions. On CEA facilities, new ferritic ODS stainless steels are produced by HE. In order to explain the microstructure observed at various places on an interrupted extrusion samples the thermo-mechanical history applied to the material must be determined. In this paper we use the Finite Element Method to simulate the co-extrusion of a PM grade in a soft steel can. The PM steel grade behavior law is determined on a fully dense material by hot torsion tests, taking into account temperature and strain-rate sensitivity. Thus strain and thermal history are computed for material points lying on various flow lines during extrusion.read more
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Book ChapterDOI
Oxide dispersion-strengthened/ferrite-martensite steels as core materials for Generation IV nuclear reactors
TL;DR: In this paper, the progress and current status for development of ODS/F-M (ferrite-martensite) steels conducted mainly in Japan and France are overviewed.
Journal ArticleDOI
Microstructural characterizations of 14Cr ODS ferritic steels subjected to hot torsion
TL;DR: In this article, the hot working behavior of ODS ferritic steels, consolidated by hot extrusion, is studied through torsion tests, and the experimental results are interpreted through a mechanism of strain accommodation at grain boundaries, with low dislocation activity in the bulk of the grains.
Journal ArticleDOI
Effect of powder metallurgy synthesis parameters for pure aluminium on resultant mechanical properties
Jinghang Liu,Javier Silveira,Robert Groarke,Sohan Parab,Harshaan Singh,Éanna McCarthy,Shadi Karazi,Andre Mussatto,Jared Houghtaling,Inam Ul Ahad,Sumsun Naher,Sumsun Naher,Dermot Brabazon +12 more
TL;DR: In this paper, pure aluminium powders of different average particle size were compacted, sintered into discs and tested for mechanical strength at different strain rates, and the results showed that the 35 μm powder particle size provided the highest radial and tangential strength while the 15 µm powder provided the lowest strength.
Journal ArticleDOI
Competition between intragranular and intergranular deformation mechanisms in ODS ferritic steels during hot deformation at high strain rate
TL;DR: In this paper, hot extrusion of ODS ferritic steels with various precipitation sizes and densities was investigated using the Electron Back-Scattered Diffraction (EBSD) technique.
Journal ArticleDOI
Numerical Simulation of the Crystallographic Texture Evolution during Hot Extrusion of Oxides Dispersed Strengthened Steels
TL;DR: In this paper, a Visco-Plastic Self-Consistent (VPSC) model was used to simulate the texture development during hot extrusion of ODS ferritic steels.
References
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On the cut-off value of negative triaxiality for fracture
Yingbin Bao,Tomasz Wierzbicki +1 more
TL;DR: In this article, a cut-off value of the stress triaxiality equal to −1/3, below which fracture never occurs, was derived analytically from the fracture locus in the principal strain space experimentally reported from tensile tests.
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Characterization of precipitates in MA/ODS ferritic alloys
TL;DR: The microstructural stability of Alloyed Alloyed, Oxide Dispersion Stiffened (MA/ODS) 14YWT ferritic alloys was investigated by atom probe tomography.
Journal ArticleDOI
Influence of Particle Dispersions on the High-Temperature Strength of Ferritic Alloys
David T. Hoelzer,James Bentley,Mikhail A. Sokolov,Michael K Miller,G.R. Odette,Matthew Joseph Alinger +5 more
TL;DR: In this article, four ferritic alloys based on the composition Fe-14Cr-3W-0.4Ti were developed with a predominant dispersion of either oxide particles or nano-size Y-, Ti-, O-rich clusters, or nanoclusters (NC).
Journal ArticleDOI
Assessment of ODS-14%Cr ferritic alloy for high temperature applications
TL;DR: In this article, the mechanical properties of ODS-ferritic alloy, Fe-14Cr-1Ti-0.25Y2O3 (MA957), were evaluated with two microstructures characterized by different grain sizes and degree of crystallographic texture.
Journal ArticleDOI
CEA developments of new ferritic ODS alloys for nuclear applications
Y. de Carlan,J.-L. Béchade,Philippe Dubuisson,J.-L. Seran,P. Billot,A. Bougault,T. Cozzika,S. Doriot,Didier Hamon,J. Henry,M. Ratti,N. Lochet,D. Nunes,P. Olier,T. Leblond,M.H. Mathon +15 more
TL;DR: In this article, the authors present the recent CEA developments on ODS materials, and show the first results obtained on the Fe-18Cr1WTi new ferritic ODS alloy.