Measurement of mechanical characteristics of corrosion products of overpack

not registered; Taniguchi, Naoki ; Kawasaki, Manabu*; Kawakami, Susumu

In the 2nd progress report, the analysis of the creep rapture of buffer material by the expansion of the overpack corrosion product was carried out. In the analysis, the expansion ratio of corrosion products was assumed three times the initial volume of the steel, also the elasticity was equal to the material of the overpack for conservative evaluation. For more realistic evaluation, these parameters must be understood more correctly, but there are few results of other researches because of it was very difficult to get elasticity by the ordinary method from very few corrosion products through the corrosion test. In this study, we have try to get elasticity directly from corrosion products by the Nano-Indentation Method As a result, the elasticity were 5070% of the bulk metal. The elasticity of the bulk metal were measured about 200GPa, ordinary value of carbon steel, it seems reasonable to apply this measuring method. About corrosion expansion, we have made test piece by the corrosion acceleration to have much more product in the short period, However, from EPMA and X-ray analysis of the products, it appeared that the acceleration of the test piece was not adequate for the simulation of expansion ratio. It is insufficient to argue the elasticity and corrosion expansion only from tentative results of this study, we must have much more results through the evaluation of corrosion acceleration method and relation of macroscopic characteristics of corrosion products and microscopic data, and so on.