ステンレス鋼の疲労挙動に及ぼすアルミナコーティングの影響

概要

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A plane bending fatigue test was conducted in air to investigate fatigue behaviors of stainless steel (SUS304) coated with alumina by the plasma-chemical vapor deposition (P-CVD) method and ion-plating, one of the physical vapor deposition (PVD) methods, respectively. Although some difference in extent existed depending upon the coating treatments, an increase in the fatigue limit of coated specimens as compared with that of the base metal was observed. Crack initiation in the coated specimen was delayed or prevented by the hard coating film on the specimen surface, because it acts as a barrier to the gliding of dislocations during fatigue, and therefore to the formation of slip bands. The fatigue strength of the coated specimen depended largely upon the suppression effect of slip deformation and the damage behavior of the coating films. In the case of the ion-plated specimen, fatigue cracks were induced at the base metal surface, where flaws in the coating film could not suppress the slip band formation.
社団法人日本機械学会の論文
1995-07-25