TiO_2 を含有する鉱滓による微細化黒鉛鋳鉄に関する研究 (IX) : S-H 鋳鉄の網目組織ならびに微小硬度測定

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The fracture surface as well as the polished surface of S-H cast iron shows a net structure having a boundary line of light gray color. The microstructure proved that the boundary-line portion was a group of austenite dendrite and that the mesh of net (meshy portion) was consisted of eutectic graphite structure. Both the micro-hardnesses of boundary-line and meshy portions were estimated. The results proved that the hardness of boundary-line portion was about 1.5∿2.7 times of meshy portion. The authors presumed that one of the major reasons of the greater wear-resistance of S-H cast iron was based upon the following characteristics : 1. The existence of a unique net structure of S-H cast iron. 2. The presence of a boundary-line portion of greater hardness in the matrix of eutectic graphite structure of lower hardness. 3. The fine and uniform distribution of fine TiC particles in S-H cast iron casting.
社団法人日本鉄鋼協会の論文
1957-12-01