Low cycle fatigue of Eurofer 97

Oxide dispersion strengthened (ODS) steels with nano-scaled oxide particles in high density in ferrite/martensite matrix and on grain boundaries of ultra-fine grains have excellent properties as structural material for fusion blankets, while some issues of fabrication processes are still remaining to be solved. In this overview, material properties of recently developed ODS steels are introduced in comparison to ferritic/martensitic (F/M) steels: 1) mechanical properties, 2) corrosion behavior and 3) radiation tolerance in ODS steels, which are outstandingly superior to the F/M steels. Coupling use of the ODS and F/M steels is effective to expand the design margin of fusion blankets. R&D of dissimilar joining of FM/ODS steels is indispensable.

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“…They also confirmed a high strength after fatigue tests of ODS steels, that is, cyclic stability, i.e. no cyclic softening [43].…”

Section: Fatiguesupporting

confidence: 55%

Oxide Dispersion Strengthened Steels for Advanced Blanket Systems

Kimura

Wang

et al. 2016

Plasma and Fusion Research

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“…For instance, the softening rate was about 23 % during the second cycle in Material 5, while it decreased to 12 % during the last cycles. Although the softening in ODS steel is lower than in the ferritic-martensitic steel 26 , it indicates that oxide dispersion itself does not guarantee a stable cyclic behaviour and other microstructural aspects have to be taken into account. It is obvious that the stress amplitude decreased with an increasing number of cycles, while the amplitude of the plastic strain increased.…”

Section: Multiple Deformation-test Seriesmentioning

confidence: 91%

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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“…So, the choice of 30% was somewhat arbitrary, but satisfied the standard. Other investigators had used 25%, 20% [15] and 10% [10] .…”

Section: Methodsmentioning

confidence: 99%

“…for examples JLF-1 [5,9] , EUROFER97 [10][11][12] and F82H [12,13] , the fatigue data of the CLAM steel is limited in literature. In order to have better understanding of the CLAM steel, it is essential to investigate its microstructure evolution and fatigue failure behavior under cyclic strain and stress loading.…”

Section: Introductionmentioning

confidence: 99%