Influence of CrN Film Surface Characteristics on Fatigue Behavior of Stainless Steel Coated with CrN Film by AIP Method

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  • ＡＩＰ法によりＣｒＮ薄膜を被覆したステンレス鋼の疲労挙動に及ぼすＣｒＮ膜表面性状の影響
  • AIPホウ ニ ヨリ CrN ハクマク オ ヒフク シタ ステンレス コウ ノ ヒロウ キョドウ ニ オヨボス CrN マク ヒョウメン セイジョウ ノ エイキョウ

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In this study, the influence of droplet distribution on fatigue strength of SUS 304 with CrN film was examined. Three point bending fatigue test were carried out for two series of CrN films coated onto austenitic stainless steel SUS 304 by arc ion plating (AIP) method. The CrN films were deposited under two different coating conditions for obtaining the different droplet distribution. The fatigue strength was decreased by coating under both coating conditions. The fatigue cracks of the coating specimens initiated at stress range below the fatigue limit of uncoated specimen. The difference between the two samples appeared in the crack initiation and propagation behavior. In the case of a few droplets sample, the fatigue cracks initiated on the film surface at the very early stage but the crack growth rate was slow. In the case of the film with many droplets, the crack initiation life was long, however, the crack growth rate was higher than that of a few droplets sample. In addition, It was easy for the film with many droplets to coalesce the fatigue cracks. The fatigue behavior was caused by the difference of these crack initiation and propagation between two samples.

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