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Data on the influence of low dose 400–550°C irradiation on the mechanical properties of structural steels (Types 304, 316, 316L, 316H and 316L(N) and associated weld metals) at temperatures from 20°C to 750°C, have been compiled from published literature and the results of British, Dutch, French and German laboratories. Properties evaluated include tensile, impact, creep, fatigue, and creep-fatigue. The preliminary results, which cover the dose range from 0 to 5 displacements per atom (and/or up to 9 appm helium) are presented as comparisons between irradiated and unirradiated control data, covering a range of strength and cyclic properties. The results show that low dose irradiation can have a significant influence on the properties, i.e.:• increases in tensile proof strength,• reductions in tensile ductility,• decreases in impact energy,• reductions in creep-rupture strength and ductility, and • reductions in creep-fatigue endurance.
By considering the influence of irradiation temperature and dose level, the results are rationalised in terms of irradiation hardening and grain boundary embrittlement mechanisms.
Pressurised Water Reactor, Fast Breeder Reactor, internal structures, irradiation, tensile, toughness, creep, creep-fatigue, embrittlement, grain boundaries
Manager, Commissariat à 1'Energie Atomique, DTA/M2RI/DECM, Gif sur Yvette,
Manager of FBR, AEA Technology, Risley, Warrington, Cheshire
DTA/M2RI/DECMA/SRMA, CEA, Gif sur Yvette,