Stability of ferritic MA/ODS alloys at high temperatures

Miller, M.K.; Hoelzer, David T.; Kenik, E.A.; Russell, K.F.

doi:10.1016/j.intermet.2004.07.036

Cited by 245 publications

(142 citation statements)

References 11 publications

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“…4c. This is in a good accordance with results reported by Miller et al [12] who reported that the oxide nanoparticles were extremely resistant to coarsening during isothermal aging at 1300°C. The coarsening of the nano-particles at 1350°C is confirmed by the histogram of the particle size distribution presented in Fig.…”

Section: Tem Observationssupporting

confidence: 93%

“…In the analyses, it was assumed that oxide nanoparticles are Y 2 Ti 2 O 7 (pyrochlore), as indicated by TEM-EDS analysis reported in Ref. [12,13]. The scattering intensity, I(q), can be described by the following equation:…”

Section: Methodsmentioning

confidence: 99%

“…This observation can be explained by the interactions of the grain boundaries in ferritic matrix with the nanoparticles present in the material [19]. Especially, Y-Ti-O nanoparticles are expected to suppress grain growth imparting a very good thermal stability of the ODS ferritic steels [11,12].…”

Section: Coarsening Mechanism Of Oxide Nanoparticlesmentioning

confidence: 99%

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Microstructural changes upon annealing in ODS-strengthened ultrafine grained ferritic steel

et al. 2013

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In this study, the stability of grain size and oxide nanoparticles in the ODS steel upon annealing at high temperature (650-1350°C) has been evaluated. The ODS Fe-Cr-W-Ti-Y 2 O 3 steel has been manufactured by powder metallurgy, consolidated by hot isostatic pressing and processed by hydrostatic extrusion. Such a processing brings about ultrafine grain structure reinforced with oxide nanoparticles (few nm in diameter) and results in superior mechanical properties. The stability of nano-oxides has been analyzed by small angle X-ray scattering together with transmission electron microscopy. The results obtained revealed excellent thermal stability of ultrafine grained ODS ferritic steel, which was attributed to the resistance of oxides against coarsening.

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Section: Tem Observationssupporting

confidence: 93%

Section: Methodsmentioning

confidence: 99%

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Microstructural changes upon annealing in ODS-strengthened ultrafine grained ferritic steel

et al. 2013

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“…Recent atom probe tomography (APT) and TEM studies have shown that the crystallography and chemical composition of the oxide nanoparticles present in ODS-RA steels can be different from the one in the starting oxide powders, giving rise to ternary oxides or core-shell particles. [11][12][13] These changes in the dispersoids could significantly affect their characteristics and, consequently, the mechanical properties and thermal stability of the material. The most sophisticated characterisation techniques must be applied to elucidate the structure of these steels at the near atomic scale, both in as fabricated conditions and after irradiation.…”

Section: Introductionmentioning

confidence: 99%

Analytical characterisation of oxide dispersion strengthened steels for fusion reactors

Castro

Lozano-Pérez

Marquis

et al. 2011

Materials Science and Technology

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Reduced activation ferritic/martensitic and ferritic steels strengthened by a dispersion of oxide nanoparticles have been considered viable structural materials for fusion applications above 550uC. However, the microstructural stability and mechanical behaviour of these steels subjected to the aggressive operating conditions of these reactors are not well known. An accelerated development of these materials is crucial if they are going to be used in future power reactors. Then, it is indispensable to understand their atomic scale evolution under high temperature and irradiation conditions. The present paper reviews how the combination of transmission electron microscopy and atom probe tomography has been successfully applied for the characterisation of these steels at the near atomic scale, to reveal the nanoparticle structure, grain boundary chemistry and void distribution.

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“…One such work was attempted in the year 1996, by dispersing ultrafine yttria particles in V-4Cr-4Ti alloy (Yamagata et al 1996). Shibayama and his coworkers developed the oxide dispersion strengthened (ODS) vanadium alloy by a novel powder metallurgy route, namely mechanical-alloying (MA) (Suryanarayana and Norton 1999;Alamo et al 1992;Miller et al 2005;Miller et al 2003;Plant and Steel 1995). Earlier reports have consolidated ODS vanadium alloys using the hot isostatic pressing (HIP) technique, while a recent report suggests that field-assisted sintering (FAST) or spark plasma sintering (SPS) technique offers a variety of microstructural merits that can enhance the high temperature mechanical properties of V-4Cr-4Ti alloys (Krishnan and Sinnaeruvadi 2016).…”

Section: Introductionmentioning

confidence: 99%

Dynamic assessment of direct-current mobility in field-assisted sintered oxide dispersion-strengthened V-4Cr-4Ti alloys

Krishnan¹,

Kumaran²

2017

Int J Mech Mater Eng

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Background: Vanadium alloy is one of the potential candidate material for structural applications in a commercial fusion reactor. Extended survival of a structural material has a direct consequence on the net energy produced in a fusion reaction, it is important to develop ultra-functional materials with tailored microstructures, to meet the harsh fusion environments. Microstructure of material, indeed depend upon the thermodynamics and kinetics of material processing. Methods: Aiming to meet the harsh fusion conditions, we have developed oxide dispersion strengthened V-4Cr-4Ti alloys by high energy ball milling and field assisted sintering technique. Possible microstructural, morphological aftermaths observed in ball milled yttria dispersed V-4Cr-4Ti powders is explored. Results and conclusion: Electron microscopy and laser particle analysis acknowledge that yttria addition aids powder agglomeration during ball milling. Ball milled powder was then consolidated (to a relative density of 100%) using field assisted sintering technique, under optimal sintering conditions. Densification profile has implied that heterogeneous powder characteristic (apparent particle size and shape of powder) tends to impede the directcurrent conductivity across the powder particle during various stages of field assisted sintering. In order to understand the kinetics of the field assisted sintering process on the starting powders, a new method was developed to compute the activation energy required for the direct-current conductivity across the individual powder particles. Relatively higher activation energy (for direct-current conductivity) is required for sintering yttria dispersed V-4Cr-4Ti powder than its V-4Cr-4Ti counterpart.

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Stability of ferritic MA/ODS alloys at high temperatures

Cited by 245 publications

References 11 publications

Microstructural changes upon annealing in ODS-strengthened ultrafine grained ferritic steel

Microstructural changes upon annealing in ODS-strengthened ultrafine grained ferritic steel

Analytical characterisation of oxide dispersion strengthened steels for fusion reactors

Dynamic assessment of direct-current mobility in field-assisted sintered oxide dispersion-strengthened V-4Cr-4Ti alloys

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