鋳鉄のフェライト生成に及ぼす冷却速度の影響

概要

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Ferrite and pearlite formation manner in cast iron was examined by changing the cooling rate of the cast iron after solidification, quenching in a large ice water tank in various temperatures from eutectic temperature up to 650°C and observing the structures of the specimens obtained. When the cooling rate was slow, at the eutectoid temperature, ferrite precipitated on the grain boundaries of the austenite and graphite where the carbon can diffuse with ease. When the cooling rate was rapid, at the eutectoid temperature, pearlite precipitated on the grain boundaries of the ferrite and austenite or graphite. When the cooling rate was exceedindly rapid, the preeutectoid cementite in the matrix structure remained at room temperature, so at the eutectoid temperature, the pearlite also precipitated on the grain boundaries of the austenite and the preeutectoid cementite. It became known that the eutectoid temperature on stable systems and metastable systems rose with the increase of silicon and chromium contents, and fell with the increase of manganese and copper contents.
Japan Foundry Engineering Societyの論文