被膜の強度評価とTiN被覆鋼の低サイクル疲労強度

概要

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rights: 本文データは社団法人日本機械学会の許諾に基づきCiNiiから複製したものであるTo clarify the effect of a ceramic coating film on the fatigue strength of metal, a strain-controlled low-cycle fatigue test was conducted in air, using a specimen of 0.37% carbon steel coated with TiN by chemical vapor deposition (CVD). An increase in fatigue strength of the coated specimen was observed in the region of low total strain amplitude, as compared with an uncoated specimen. On the other hand, fatigue strength of the coated specimen decreased in the region of high strain amplitude. This behavior was explained in terms of the fracture of the thin film during the fatigue process, which is affected by the strength of the film itself and the deposition method. Cracks were induced at the substrate due to flaws in the coating film which act as notches. The notch effect of flaws in the film depends on the thickness of the film and adhesion between the film and substrate, which is obtained in a scratch test.
1994-01-25