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Subprogramme 2 – Innovative high temperature resistant steels

Marta Serrano (repl. by L. Malerba)

CIEMAT

SP2 Coordinator

Workshop with Member States’ Stakeholders, Brussels, 10 Sept. 2014

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Focus on components exposed to the harshest conditions (SFR, LFR)

Gen IV Cladding tubes

316 60 dpa at 600oC316 60 dpa at 600oC

Irradiated316

Irradiated316

Cladding,Internals

Swelling

Creep

He (ADS)

RIS

Coolant

Cladding,Internals

Swelling

Creep

He (ADS)

RIS

Coolant

SFR:Temperature : 650ºC Diameter 10.73 mmDose : > 150 dpa Thickness 0.500 mmStress : up to 100 Mpa Thin tubes several

meters long(R.E. Logé, CEA)

Requirements:- High temperature (creep)

resistance

- High swelling resistance

- Compatibility with coolant (liquid metal)

Candidates:- Oxide dispersion

strengthened (ODS) steels- Creep strength enhanced

ferritic (CSEF) steels (through termomechanical treatments)

Both are also candidate fusion materials

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ODS tubes can be fabricated …

• ODS cladding tube fabrication has been demonstrated: France, Japan, Russia, US …

M. Le Flem (CEA)

J. Ribis (CEA)

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… but much R&D remains!

• Increase ductility (ODS tend to be brittle)

• Control microstructure (reduce anisotropy of thin-walled tubes)

• Reduce fabrication cost (powder metallurgy or new routes)

• Scale to industrial fabrication

• Fully qualify material for application as cladding

• …

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Research in SP2

• Monitoring national programmes European activities on ODS/Enhanced creep alloys “Catalogue” of available materials / producers

• Exploring new fabrication routes: (FP7/MATTER) Improvement of powder metallurgical process and optimization of final thermo-

mechanical treatment Conventional steel making techniques (introducing the oxide particles in the

melt) Spark plasma sintering techniques

• ODS cladding tubes characterization (FP7/MATISSE, FP7/GETMAT follow-up) Microstructural stability under high temperature and irradiation Anisotropy studies (biaxial mechanical testing) Screening activities under accidental scenario

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ODS PP

Capitalization of results within SP2

GETMAT (~1.5 M€ / 50%)ODS fabrication & characterisation

2008 20132011 2014 2015 2017

MATTER (~0.5 M€ / 50%)Optim. fabrication route

MAtISSE (~450 k€ / 50% + 450 k€ in-kind)

Clad. tube characterisation

JPNM/SP2(~40 PY/Y)

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Next steps & links

• Identify new industrial partners

• Dissemination & international cooperation (INERI-USA, IAEA, NEA)

• Consider other innovative steels: CSEF

2015 2017 2020

• Validated conventional and/or cheaper fabrication routes

• Production at industrial scale

Optimised ferritic and martensitic ODS cladding tubes: controlled microstructure & mechanical properties

• Same materials as for fusion: operating conditions & form differ, but fabrication problems and requirements of radiation resistance are similar

• High temperature resistance is of use also for other energy technologies links with other EERA JPs, EMIRI, ESTEP (for fabrication), …

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Thank you for your attention