831 真空炉中で再溶融処理を施した Co 基自溶合金溶射材の疲労特性 : 皮膜厚さの影響

概要

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Fatigue strength and fracture mechanism of a medium carbon steel (S35C) with gas flame thermally sprayed Co-based alloy coatings were investigated by rotating bending tests. The fatigue characteristics depend on coating thickness, and fatigue strength increases with increase in coating thickness. The result showed that at lower stress levels, the fatigue cracks were initiated inside the substrate of 0.3mm and 0.5mm coated specimens only (Internal failure in the substrate). On the other hand, at higher stress levels the fatigue cracks were initiated at the coating layer, which were originated from the porosity located in coating layer of all coated specimens (Surface failure in the coating layer). But on fracture mode transition was noticed for the case of 1.0mm coated specimen.
一般社団法人日本機械学会の論文
2000-07-31