Reactive gas atomization processing for Fe-based ODS alloys

Rieken, Joel; Anderson, Iver E.; Kramer, M. J.; Odette, G.R.; Stergar, Erich; Haney, E

doi:10.1016/j.jnucmat.2011.08.015

Cited by 68 publications

(65 citation statements)

References 25 publications

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“…This reactive gas atomization process results in the formation of an ultra thin (ξ < 150 nm) Cr-enriched surface oxide layer. This was calculated to form a stabilized planar growth front, signifying the ability to achieve a microsegregation-free solidification structure in these powders that is consistent with recent experimental observations (see Chapter 10) [146].…”

Section: Discussionsupporting

confidence: 86%

“…shown by the vertical dashed red lines in Figure 4.11 d, e, and f [146]. For this reason, it was established that the chemical granular method could not be used to accurately describe the surface oxide layer thickness.…”

Section: Resulting Oxygen Contentmentioning

confidence: 99%

“…Support microstructure [146]. This chapter will be used to demonstrate an analogous Oexchange reaction, using a coarser as-cast ferritic stainless steel (Fe-Cr-Y) alloy microstructure, in an effort to evaluate the reaction kinetics for dispersoid formation in similar CR-alloys.…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…This results in the formation of Y-enriched nano-metric oxide dispersoids throughout the alloy microstructure [146,179].…”

Section: Introductionmentioning

confidence: 99%

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Gas atomized precursor alloy powder for oxide dispersion strengthened ferritic stainless steel

Rieken

2011

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Section: Discussionsupporting

confidence: 86%

Section: Resulting Oxygen Contentmentioning

confidence: 99%

Section: Acknowledgmentsmentioning

confidence: 99%

“…This results in the formation of Y-enriched nano-metric oxide dispersoids throughout the alloy microstructure [146,179].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Gas atomized precursor alloy powder for oxide dispersion strengthened ferritic stainless steel

Rieken

2011

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“…In the later steps after HIP, the deformed powders are hot extruded or rolled for the desired shape. Although this method for ODS steels is well documented, it is considered a complex and costly fabrication technique [9,10]. In the present study an alternative process for the production of stainless ODS steels has been investigated.…”

Section: Introductionmentioning

confidence: 99%

Casting technology for ODS steels - the internal oxidation approach

Miran

Franke

Möslang

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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View the article online for updates and enhancements. Related contentCasting technology for ODS steelsdispersion of nanoparticles in liquid metals M Sarma, I Grants, I Kaldre et al. Abstract. The formation of stainless ODS steel by internal oxidation of as-cast steel has been investigated. An alloy (Fe-16Cr-0.2Al-0.05Y, wt.%) was embedded in a (VO/V 2 O 3 ) powder mixture serving as an oxygen activity buffer and heat treated at 1450°C for 20 h. After this procedure no oxide scale was present on the surface of the sample but a zone of internal oxidation with a depth of about 2000 µm was formed in its interior. The precipitates within this zone consisted of two types of oxides. Discrete aluminium oxide particles with a size of a few micrometres were formed in outer regions of the specimen. Finer aluminium-yttrium oxides with a size of some hundred nanometres were mainly precipitated in inner regions of the sample. The results can be considered as a promising step towards an alternative production route for ODS steels. IntroductionReduced activation ferritic-martensitic (RAFM) steels are promising candidate materials for structural applications in fusion reactors. These steels have been developed based on massive industrial experiences of ferritic/martensitic steel [1]. RAFM steels have interesting properties such as low sensitivity to irradiation-induced swelling and helium embrittlement [2].RAFM steels are very attractive structural materials but their high-temperature strength is limited and one of the effective approaches to solve this issue is oxide dispersion strengthening (ODS) method [3]. The nano-sized oxide particles with high number density can act as pinning points to dislocation movement [4]. Dispersed nano-sized oxides may provide a large number of trap sites for transmutant helium and radiation-induced defects [5]. The improved creep resistance and fatigue strength at high temperatures is another advantage of ODS steels [6].The typical procedure for manufacturing ODS steels is the powder metallurgy route in which steel powders and Y 2 O 3 powders are mechanically alloyed by high energy milling. The input oxides remain unmixed but they are dispersed throughout the microstructure of the alloy [7]. This technique was first developed by J. S. Benjamin and published in 1970 [8].The next step in this route is hot isostatic pressing (HIP). In HIP process, the simultaneous application of a high pressure at elevated temperatures in a constructed vessel is planned for hot compaction of the powders. The pressure inside HIP chamber is generated usually by applying purified argon gas. In the later steps after HIP, the deformed powders are hot extruded or rolled for the desired shape.

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Atomization of Alloys

2024

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Reactive gas atomization processing for Fe-based ODS alloys

Cited by 68 publications

References 25 publications

Gas atomized precursor alloy powder for oxide dispersion strengthened ferritic stainless steel

Gas atomized precursor alloy powder for oxide dispersion strengthened ferritic stainless steel

Casting technology for ODS steels - the internal oxidation approach

Atomization of Alloys

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