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O.P.Maksimkin, M.N.Gusev, K.V.Tsai, O.G.Romanenko, L.G.Turubarova, N.S.Silnyagina, O.V.Tivanova

Influence of neutron irradiation parameters on swelling and mechanical properties of stainless steels - materials of BN-350 fuel assembly ducts. O.P.Maksimkin, M.N.Gusev, K.V.Tsai, O.G.Romanenko, L.G.Turubarova, N.S.Silnyagina, O.V.Tivanova. Laboratory of the materials physical-mechanical

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O.P.Maksimkin, M.N.Gusev, K.V.Tsai, O.G.Romanenko, L.G.Turubarova, N.S.Silnyagina, O.V.Tivanova

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  1. Influence of neutron irradiation parameters on swelling and mechanical properties of stainless steels - materials of BN-350 fuel assembly ducts O.P.Maksimkin, M.N.Gusev, K.V.Tsai, O.G.Romanenko, L.G.Turubarova, N.S.Silnyagina, O.V.Tivanova Laboratory of the materials physical-mechanical properties investigations, maksimkin@inp.kz Almaty, Kazakhstan Republic, 2005

  2. Report contents • Mechanical properties of investigated steels • Influence of damage dose rate on microstructure and swelling of investigated steels. • Peculiarities of plastic deformation of highly irradiated materials.

  3. поток нейтронов Т, оС 280 450 Investigated materials Neutron flux • 08Cr16Ni11Mo3 • 12Cr18Ni10Ti Object of investigation – hexagonal shroud of fuel assemblies Sample’s sizes: 2020.3mm.

  4. Irradiation condition for investigated steels

  5. Experimental equipment and investigation techniques • Uniaxial tensile mechanical test. (definition of 02В, full). • Transmission and scanning electron microscopy (concentration and morphology of radiation defects, swelling value). • Metallography and microhardness measurement. • Magnitometry and optical extensometry.

  6. Influence of irradiation on mechanical properties of 08Cr16Ni11Mo3 steel B 02

  7. Correlation between yield stress and microhardness

  8. Changes in density of irradiated 08Cr16Ni11Mo3 steel

  9. Swelling of irradiated 08Cr16Ni11Mo3 steel

  10. Voids in irradiated 08Cr16Ni11Mo3 steel

  11. 50 nm Voids in irradiated 12Cr18Ni10Ti, assembly N-214(1) Dose 0.67 dpa, Dose rate 0,1210-8dpa/s, Tirr = 281°С

  12. Influence of dose rate on yield stress of 08Cr16Ni11Mo3

  13. Peculiarities of plastic deformation and fracture of high irradiated samples The deformation relief develops in zone of localized deformation SEM image of fracture surface for specimen from «-1200mm» mark (08Cr16Ni11Mo3 steel).

  14. Method of mark extensometry for miniature irradiated samples

  15. σист,кг/мм2 ε, % Рабочая длина образца Рабочая длина образца Distribution of strains and stresses on on deformed sample of 08Cr16Ni11Mo3 steel V-337, -500.

  16. Engineering curves and dependences “true stress – conditional strain” Irradiated (V-337, -500) «true» curves Unirradiated steel

  17.  Relationship between true stress and true strain for irradiated 08Cr16Ni11Mo3 steel

  18. Conclusion • The changes in structure and mechanical properties of 08Cr16Ni11Mo3 and 12Cr18Ni10Ti steels – as materials of spent fuel assemblies of BN-350 reactor – irradiated up to damage doses 0.25 – 15.6 dpa at dose rate from 810-10to 2.610-7dpa/s were investigated. • It was found that the dose rate is one of important factors influencing on void formation and development as well as on formation of mechanical properties of investigated materials. • The void formation at low dose rates and low damage doses (1.27 dpa for 08Cr16Ni11Mo3 steel and 0.67 dpa for 12Cr18Ni10Ti steel) was observed. • The method of mark extensometry was proposed and applied for investigation of peculiarities of plastic deformation of miniature specimens irradiated at various dose rates. • It was shown that relation between true stresses and true strains at localized deformation of high irradiated steel samples can be described by equation =k0.5+0.

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