Microstructure and mechanical properties of ultrafine-grained Fe-14Cr and ODS Fe-14Cr model alloys.
TL;DR: In this article, the reduced activation ferritic Fe-14-wt%Cr and Fe- 14-t%Cr-0.3%Y 2 O 3 alloys were produced by mechanical alloying and hot isostatic pressing followed by forging and heat treating.
About: This article is published in Journal of Nuclear Materials.The article was published on 2011-10-01 and is currently open access. It has received 36 citations till now. The article focuses on the topics: Hot isostatic pressing & Heat treating.
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Dissertation•
14 Dec 2015
TL;DR: In this paper, a caracteriser et a modeliser of the microstructure of aciers ferritiques ODS, generalement elabores par filage a chaud, possedent a complex micro-structure complexe (texture morphologique et cristallographique, fine precipitation, forte densite de dislocations, differentes tailles de grains) rendant the comprehension of the relation entre la microstructures and les proprietes mecaniques delicate.
Abstract: Les aciers renforces par une dispersion d’oxydes nanometriques (ODS : Oxide Dispersion Strengthened) sont connus pour leur bonne tenue en fluage a haute temperature et pour leur bonne resistance au gonflement sous irradiation. Ils sont envisages comme materiaux potentiels pour le gainage combustible des reacteurs de quatrieme generation (Reacteur a Neutrons Rapides refroidis au Sodium). Les aciers ferritiques ODS, generalement elabores par filage a chaud, possedent une microstructure complexe (texture morphologique et cristallographique, fine precipitation, forte densite de dislocations, differentes tailles de grains) rendant la comprehension de la relation entre la microstructure et les proprietes mecaniques delicate. Le travail de cette these a consiste a caracteriser et a modeliser l’effet des differents composants de la microstructure sur le comportement mecanique d’aciers ferritiques Fe-14Cr ODS, ainsi que d’affiner la comprehension de leurs mecanismes de deformation. Pour cela, des materiaux modeles ont ete elabores par compaction isostatique a chaud puis caracterises, dans lesquels les differents parametres microstructuraux ont ete varies de maniere controlee. Leur microstructure a ete determinee a l’aide de diverses techniques de caracterisation avancees (MEB-EBSD, MET, DXPA, microsonde de Castaing, …). Ces differentes nuances ont ete testees en traction sur une large gamme de temperature et en fluage a 650°C et 700°C. Les resultats ont mis en evidence l’effet de la taille et la fraction des oxydes, de la structure de grains, et de la presence du Titane, et ont servi de base pour proposer une modelisation. Des essais de deformation in situ au MET ainsi que des essais de traction a chaud avec mesure des champs de deformation locaux ont permis de mettre en evidence une transition entre mouvement saccade de dislocations a basse temperature, et mecanismes de deformation a chaud, intragranulaires (vieillissement dynamique, mouvement de dislocations continu) et intergranulaires. A haute temperature, un fort endommagement au niveau des joints de grains est observe.
14 citations
Cites background from "Microstructure and mechanical prope..."
...La microstructure est formée de grains nanométriques et de grains microniques [39, 40]....
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...Cette distribution bimodale est constamment observée pour des aciers ODS ferritiques élaborés par compaction isostatique à chaud [39, 139, 141]....
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...Il est possible que ces précipités riches en chrome soient également présents sous forme de carbure de type (Fe, Cr)23C6 comme l’observent Olier [149] ou encore Auger [39]....
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...Une distribution bimodale de grains a également été observée sur plusieurs aciers ferritiques ODS Fe-14Cr élaborés par compaction isostatique à chaud [137, 39, 138, 139, 140]....
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01 Aug 2016-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, a systematic study has been undertaken to assess how the milling atmosphere, in the processing of an ODS steel with nominal composition Fe-14Cr-0.3Y2O3 (wt%), will affect the microstructure and mechanical properties of the resultant alloys.
Abstract: A systematic study has been undertaken to assess how the milling atmosphere, in the processing of an ODS steel with nominal composition Fe-14Cr-0.3Y2O3 (wt%), will affect the microstructure and mechanical properties of the resultant alloys. Batches of the steel were manufactured by a powder metallurgy route incorporating mechanical alloying, hot isostatic pressing, forging and heat treatment. Hydrogen or helium atmospheres were used in the mechanical alloying, with all other processing parameters remaining identical. Transmission electron microscopy (TEM) and Atom Probe Tomography (APT) show that both milling atmospheres promote a homogeneous dispersion of Y-rich nanoparticles in the final alloys, being smaller when milling in H. Previously reported mechanical characterisation of these alloys shows better mechanical response at high temperature for the alloy milled in a H. This can be justified by the presence of smaller Y-rich nanoparticles together with the absence of bubbles, observed in the alloy milled in He.
13 citations
TL;DR: In this paper, a ferritic steel alloyed with (Y-Ti-Zr-Al) was produced by m echanical a lloying (MA) and s park p lasma s intering (SPS) to obtain a complex nanostructure.
12 citations
TL;DR: In this article, Fe-14Cr pre-alloyed powder and pure Hf powder were mechanically alloyed to produce powder with nominal composition Fe- 14Cr-0.22Hf (wt. %) that was consolidated by the spark plasma sintering (SPS) technique in order to investigate the ability of Hf to produce a nanometric dispersion of oxide particles in a ferritic matrix.
12 citations
TL;DR: In this paper, the authors focused on two types of Y2O3 strengthened steels (Fe-14Cr ODS and ODS-EUROFER) and measured small fatigue crack propagation using small cylindrical specimens (diameter 2 and 2.6mm) with shallow notch grinded in the gauge length.
10 citations
References
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TL;DR: WinPLOTR is a graphic program for the analysis of powder diffraction patterns that has been developed for a Windows 9x/2k/NT environment and can be used as a Graphic User Interface for programs defined by the user.
Abstract: WinPLOTR is a graphic program for the analysis of powder diffraction patterns. It has been developed for a Windows 9x/2k/NT environment. It takes advantage of this graphical environment to offer a powerful and user-friendly powder diffraction tool. The program is able to display and analyse many different kinds of diffraction patterns as well as calculated and observed profiles coming from the Windows/DOS version of the program FullProf. It can also be used as a Graphic User Interface (GUI) for programs defined by the user.
1,638 citations
TL;DR: The use of the Voigt function for the analysis of the integral breadths of broadened X-ray diffraction line profiles forms the basis of a rapid and powerful single-line method of crystallite size and strain determination which is easy to apply.
Abstract: The use of the Voigt function for the analysis of the integral breadths of broadened X-ray diffraction line profiles forms the basis of a rapid and powerful single-line method of crystallite-size and strain determination which is easy to apply. To avoid graphical methods or interpolation from tables, empirical formulae of high accuracy are used and an estimation of errors is presented, including the influence of line-profile asymmetry. The method is applied to four practical cases of size-strain broadening: (i) cold-worked nickel, (ii) a nitrided steel, (iii) an electrodeposited nickel layer and (iv) a liquid-quenched AlSi alloy.
1,085 citations
TL;DR: In this article, the authors reviewed the JNC activities on ODS steel development as "nano-composite materials" and concluded that the ODS-technology development achieved in the field of fast reactors should be effectively spun off to the fusion reactor first wall and blanket structural materials to allow for safe and economical reactor design.
673 citations
Book•
01 Jul 2001
523 citations
"Microstructure and mechanical prope..." refers background in this paper
...Fe–Cr binary alloys are nowadays the most promising base to fabricate reduced-activation ferritic/martensitic (RAFM) and ferritic (RAF) steels for structural applications in future fusion reactors as well as in generation IV fission reactors [1–3]....
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TL;DR: In this article, the differences and similarities of different ODS steels are explained in terms of the microstructures of the steels, and observations are explained using the properties of the ODS micro-structures.
478 citations