K-0716 表面改質を施した高硬度鋼SKD61の耐食性評価と腐食疲労強度特性(S07-4 疲労信頼性の向上(薄膜,窒化))(S07 表面改質とその機能特性評価)

概要

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In order to investigate the effect of surface treatment on corrosion fatigue strength of a hard steel, cantilever-type rotating-bending fatigue test in saline solution was conducted using the smooth specimens of alloy tool steel, SKD61, with four kinds of surface treatment; that is, TiN coating by PVD method, plasma assisted ion-nitriding, duplex treatment with the ion-nitriding followed by the TiN coating and gas-nitriding. And also, anodic polarization curve was measured for those surface modified specimens to evaluate a corrosion resistance of surface modified layer. The compound layer formed on specimen surface during gas-nitriding process had high corrosion resistance, and corrosion fatigue strength was obviously improved by gas-nitriding. The other specimens surface modified having no compound layer showed a good corrosion resistance compared with untreated specimen, but corrosion fatigue strength was not improved in high cycle region.
2001-08-22