Lead-bismuth fast reactor is considered to be the most promising solution to meet the enormous energy demand in the future. The 15-15Ti austenitic stainless steel with outstanding corrosion and irradiation resistance has been proposed as main cladding candidate material for lead-bismuth fast reactor. However, the mechanical properties of 15-15Ti are weakly influenced by LBE. Shot peening as one of surface strengthening technique can efficiently improve metal mechanical properties. In this paper, shot peening (SP) treatment was applied on 15-15Ti. The microstructures and compositions were investigated using Optical Microscope, Scanning Electron Microscope and X-Ray Diffraction. It concludes that the material hardness is improved, and the residual stress induced by SP did not cause martensitic phase transformation on the sample surface. The presence of slip bands and other obstacles in the reinforcement layer improved the yielding and tensibility of the material.

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The austenitic stainless steel 316Ti with the addition of titanium is a promising candidate for fuel cladding due to its excellent corrosion resistance performance in LBE. In this paper, the corrosion behaviour of 316Ti steel in the static Lead-Bismuth Eutectic (LBE) for 1000 h at 550 °C is studied. The surface and cross-section morphologies of samples after corrosion were examined using Scanning Electron Microscope, Energy-Dispersive X-ray Spectroscopy and X-ray Diffraction. It concluded that the 316Ti undergoes both oxidations accompanied by the formation of a double-layer oxides and elements leaching that resulted in the nonuniform distribution of Cr, Ni, and Fe near the matrix/LBE interfac. The external oxide film mostly consisted by Fe3O4, and the internal oxide layer is primarily Fe-Cr spinel.

The austenitic stainless steel 15-15Ti is one of the main candidate materials for the fuel cladding of the Lead-cooled Fast Reactor (LFR) due to its outstanding irradiation resistance and mechanical properties at high temperatures. The study of the corrosion behavior of 15-15Ti in LBE can help further investigate the service performance in a reactor. In this study, the static LBE corrosion of 15−15Ti was carried out for 1000 h at the temperature of 550°C and the oxygen concentration of 5×10−7 wt%. The samples were analyzed by Scanning Electron Microscope (SEM), Energy Dispersive X-ray Spectroscopy (EDS), and X-ray Diffraction (XRD). The results showed that 15-15Ti was oxidized and formed a duplex oxide film. The inner oxide film is continuous and the main component is FeCr2O4. The outer oxide film is composed of Fe3O4. The Fe3O4 oxides are loose and they could fall off from the surface.

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