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Within a collective exercise, a systematic and statistically based analysis of the repeatability and device dependence of small punch test results was performed. An unirradiated ferriticmartensitic steel T91 was selected for this. The test results allowed an evaluation of accuracy and reliability of material properties extracted from load-displacement-based and energybased parameters. In a second step, neutron irradiated T91 with doses of 2.3 and 4 dpa was investigated in the temperature range -165 °C to 300 °C. The effects of test temperature and irradiation on the load-displacement curves and on the derived parameters were analysed. It was found that the small punch test is well suited for estimation of neutron embrittlement in cases of small amounts of available material or high activity. The preferred procedure for that purpose was specified.

In this paper tensile tests and LS and LT notched Charpy impact tests were performed at the temperature range between-196 and 200 °C on an oxide dispersion strengthened (ODS) Fe20Cr6Al0.5Y 2 O 3 hot-rolled tube. The absorbed energy values in the range of high-temperatures of LS notched specimens is considerably higher than those of LT notched specimens; however such values tend to converge as temperature increases. Ductile fracture on the normal planes to RD with delaminations parallel to the tube surface were observed in the temperature range between RT and 200 °C. Delaminations of crack divider type were observed in LT specimens, whereas delaminations of crack arrester type were observed in LS specimens. The yttria particles in the grain boundaries and the transverse plastic anisotropy are the possible causes of that the delaminations were parallel to the tube surface.