The Relationship between Fatigue Properties and Microstructures in Rolled Metal Film(Thin Films)

概要

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Using a new film fatigue testing method by which fatigue cracks can be initiated and propagated in a film adhered to cover a circular through-hole in a base plate subjected to push-pull cyclic loads, rolled iron films annealed at 873 K and 1173 K were fatigued with a stress ratio of R=0. From the crystallographic information of rolling textures in annealed iron films obtained by EBSD (Electron Backscatter Diffraction) method, the anisotropy of rolling texture remained after annealing. In order to discuss the effect of rolling texture on fatigue crack propagation properties of iron films with the thickness of 100 μm, the two types of specimen that rolling direction was parallel and perpendicular to loading direction were prepared in film fatigue testing. The cracks in the film annealed at 873 K propagated along the grain boundary and the crack propagation rate is approximately the same for the two types of specimen. The cracks in the film annealed at 1173 K propagated across the grain and there was a difference between the two types of specimen in crack propagation behavior and crystallographic information around the fatigue crack obtained from the EBSD method. The reason was probably that the slip system of the rolling texture in iron film annealed at 1173 K is different in accordance with the relationship between rolling direction and crack propagation direction.
一般社団法人日本機械学会の論文
2001-10-20