抄録
The effect of carbon on graphitization of white cast iron was investigated by varying carbon content to 2.15,2.63 and 2.96% in specimens with the silicon content. fixed at 1.3%. The process of the first stage of graphitization was shown by a dilation-time curve, and that of the second stage of graphitization by tan isothermal transformation diagram. Furthermore, the second stage of graphitization was divided into two phases, namely the direct and the indirect transformations. The results obtained were as follows: (1) The time required for the completion of the first stage of graphitization was the shortest in the case of iron containing 2.63% of carbon, and was the longest in the case of iron containing 2.96% of carbon. (2) In both the direct and the indirect transformations, the time required for the completion of the second stage of graphitization was shortened with increasing contents of cabon. (3) The temperature range, which the indirect transformation made the time required for the completion of graphitization shorter than in the case of the direct, was determined for each specimen used in this work.
