Abstract
Fatigue properties of TiCrAlSiN/CrN coated high-speed tool steels, JIS SKH51, with different film thickness were investigated under four point bending fatigue tests. Two types of specimens with 2.64 μm (S-2.5) and 5.24 μm (S-5.0) film thicknesses were prepared by AIP (Arc Ion Plating) processing. From the experimental results, Static bending strength of the two coated steels was lower than that of the substrate and effect on the strength of film thickness was little. However the two coated steel have higher fatigue strength than that of the substrate. The difference of fatigue strength between the two coated steels appeared over a range of number of cycles from 10^5 to 10^6.
