面内純せん断負荷下での炭素鋼薄膜のき裂発生におよぼす微視組織の影響

抄録

At the same materials, mechanical properties of a film different from those of a bulk and we consider that fatigue property of a film is different from that of a bulk. In this study, we think that formation of fatigue slip band of thin film materials of pure iron , S10C, and S45C, are different from each other and conducted a microscopic observation of the slip band of each thin films. Also we observed strains of each thin films by using Electron Back Scatter Diffraction Pattern (EBSD). As a result, we confirmed that slip bands occurred at the grain boundaries in pure iron, slip bands occurred in a wide range within the grains in S10C and slip bands occurred in a short range within the grains in S45C. Also we consider that strain occurred at the grain boundaries in pure iron, strains occurred in a wide range within the grains in S10C and strains occurred in a short range within the grains in S45C by EBSD. We indicate that in the case of carbon steel, forms of generation of strain within the ferrite crystal grain differs depending on the different in restraint of perlite.