2018 | AFC ACCOMPLISHMENTS 87 The tube microstructure resulted in very high longitudinal and hoop strengths at room temperature, but led also to anisotropic tensile properties with the ductility in the hoop direction being lower than along the tube. Post-annealing treatment to reduce the tube residual stress was found to be a possible route to improve the tube ductility with a moderate reduction of the tube strength. Recrystallization of the tube with the formation of larger grains was observed for temperature as low as 900ºC, and the number of recrystallized grains increased as the annealing temperature increased. Results were consistent with previous experiments conducted on cold rolled foils.The CrAZY tube showed also good oxidation resistance in steam up to 1400ºC, and specimens have been machined to evaluate the irradiation resistance of the tube at the high flux isotope reactor (HFIR). Ongoing work aims at the fabrication of at least 5 new CrAZY tubes through a similar collaboration with an industrial partner. Slight modifications of the process parameters and alloy chemistry are expected to lead to further improvement of the tubes microstructure and properties. The thin ODS FeCrAl “CrAZY” tube fabricated by pilgering exhibited very high strength at room temperature and great oxidation resistance in steam at 1400ºC Figure 4: a) Specimens used to characterize ODS CrAZY sheet and tube, b) Room temperature tensile curves showing the high strength but limited ductility of the ring specimen. Annealing for 1h at 900ºC improved the CrAZY tube ductility and decreased slightly the tube strength. Similar results were observed for thin CrAZY foils.