球状黒鉛鋳鉄の乾燥―すべり摩耗機構について

概要

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In respect of spheroidal graphite cast iron with bull's eye and ferrite matrix, their dry sliding wear mechanism were investigated. The result was found that wear characteristic curves of each cast iron are similar to flake graphite cast iron. On spheroidal graphite cast iron, however, at 3.00-4.00m/s of sliding velocity were formed hard layer which seems martensite with approx. 0.02mm thick on sliding surface. And ferrite cast iron within both oxiditive wear limit and stable wear limit is on the side of higher pressure and velocity than bull's eye cast iron. But in the result of experiment under wear condition to be fit for stable wear limit, wear loss is about 1.5-2.0 times as bull's eye cast iron in case of ferrite cast iron. Wear have been continuously increased until 10,000 meters of sliding length under applied condition in the mild wear range. And only γ-Fe2O3 was found in the initial stage of wear in the result. In increasing of sliding length gradually, γ-Fe2O3 change into α-Fe2O3 and there become to be α-Fe together with some of them.
日本鋳造工学会の論文