Effect of microstructure on low cycle fatigue properties of ODS steels

Kuběna, Ivo; Fournier, Benjamin; Kruml, Tomáš

doi:10.1016/j.jnucmat.2012.02.011

Cited by 49 publications

(32 citation statements)

References 28 publications

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“…In the consolidation step the processing temperatures are critical in order to retain the nanocrystalline structure generated during the mechanical alloying and to impede particle coarsening and grain growth. [11][12][13][14] The Ni-and Fe-based ODS alloys rely on the formation of slowly growing and strongly adherent chromium and aluminium scales for their high-temperature oxidation/corrosion resistance. Because of the lower diffusion coefficient, austenitic ODS alloys show a better creep resistance for the same oxide volume fraction and contain some minimum chromium/ aluminium content to guarantee sufficient oxidation resistance.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of new ODS alloys under single and multiple deformation

Mašek¹,

Khalaj²,

Nový³

et al. 2016

Mater. Tehnol.

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The application of innovative processing techniques to conventional raw materials can lead to new structural materials with specific mechanical and physical properties, which open up new possibilities of use in some areas of industry. The processing is enabled by powder metallurgy, which utilizes powders consisting of a metal matrix with dispersed stable particles achieved by mechanical alloying and their hot consolidation by rolling. New oxide dispersion strengthened (ODS) Fe-Al-based alloys are tested under different single and multiple thermomechanical treatments at different temperatures. The results show that new ODS alloys are significantly affected by the thermo-mechanical treatment, leading to microstructural changes. Their analysis is performed using different analytical methods such as optical microscopy, scanning electron microscopy and X-ray diffraction analysis. Keywords: ODS alloys, composite, steel, Fe-Al Uporaba inovativnih tehnik preoblikovanja na obi~ajnih materialih lahko privede do novih konstrukcijskih materialov s specifi~nimi mehanskimi in fizikalnimi lastnostmi, ki odpirajo nove mo`nosti uporabe v industriji. Metalurgija prahov omogo~a uporabo prahov s kovinsko osnovo z dispergiranimi stabilnimi delci, ki jih dobimo pri mehanskem legiranju in vro~i konsolidaciji z valjanjem. Nove zlitine Fe-Al, disperzijsko utrjene z oksidi (ODS), so bile preizku{ene pri razli~ni, eno-ali ve~stopenjski obdelavi pri razli~nih temperaturah. Rezultati ka`ejo, da ima termomehanska obdelava novih ODS zlitin mo~an vpliv, ki se vidi v spremembah mikrostrukture. Analiza je bila izvedena s pomo~jo razli~nih analitskih metod, kot so: svetlobna mikroskopija, vrsti~na elektronska mikroskopija in rentgenska difrakcijska analiza.

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Section: Introductionmentioning

confidence: 99%

Behaviour of new ODS alloys under single and multiple deformation

Mašek¹,

Khalaj²,

Nový³

et al. 2016

Mater. Tehnol.

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“…Sufficient amounts of Al and/or Cr in the ODS alloys are crucial for their oxidation resistance. [14][15][16] On the basis of the thermomechanical and microstructure analyses, this paper presents the development of the new ODS Fe-Al based alloys and ODS composites applicable at high temperatures of up to about 1100°C. The new ODS composites consist of a ferritic Fe-Al matrix strengthened with about volume fractions from 6 % to 10 % of Al 2 O 3 particles.…”

Section: Introductionmentioning

confidence: 99%

Investigation on new creep- and oxidation-resistant materials

Khalaj¹,

Mašek²,

Jirková³

2015

Mater. Tehnol.

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The specific mechanical property and structure of a material can be achieved by combining various types of materials and technologies. The main aim of this research is to develop new creep-and oxidation-resistant materials (ODS) (new ODS Fe-Al based alloys and ODS composites) applicable at high temperatures of up to about 1100°C. The new ODS composites consist of a ferritic Fe-Al matrix strengthened with about volume fractions 2 % to 30 % of Al2O3 particles. In order to find the optimum material structure, different oxide amounts were added to three different containers. Also, to find the influence of the temperature on the obtained structures, three processing temperatures of (26, 750 and 1150)°C were used with the specific deformation profile. An analysis of the structures was performed using different analytical methods such as light microscopy, scanning electron microscopy and X-ray diffraction analysis. Keywords: ODS steel, alloys, composite, creep, Fe-Al Posebne mehanske lastnosti in strukturo materiala je mogo~e dose~i s kombinacijo razli~nih vrst materialov in tehnologij. Glavni namen tega~lanka je razviti nov material, odporen proti lezenju in oksidaciji (ODS), tj. novo ODS-zlitino na osnovi Fe-Al in ODS-kompozite, uporabne pri visokih temperaturah do 1100°C. Novi ODS-kompozit je sestavljen iz feritne Fe-Al-osnove, oja~ane z okrog volumenskim dele`em od 2 % do 30 % delcev Al2O3. Da bi dobili optimalno strukturo materiala, je bil v tri vsebnike prime{an razli~en dele`oksida. Za ugotovitev vpliva temperature na dobljeno strukturo so bile uporabljene tri temperature izdelave (26, 750 in 1150)°C s posebnim profilom deformacije. Analiza strukture je bila izvr{ena z razli~nimi metodami, kot so svetlobna mikroskopija, vrsti~na elektronska mikroskopija in rentgenska difrakcija.

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“…Stress amplitude at half life for the same strain amplitude is systematically the highest for the EPFL steel (smallest grains in small grain regions) and the lowest for the ODS Eurofer (the largest grains, Table 2). The strengthening mechanisms of the three materials are discussed in more details in [16].…”

Section: Discussionmentioning

confidence: 99%

“…All tests reported in this paper were carried out in air at room temperature (23°C). Results concerning high temperature cyclic behaviour of the materials were published elsewhere [16].…”

Section: Methodsmentioning

confidence: 99%