Abstract
Good effects can be observed in melting some sorts of Ti containing pig iron by cupola.
1) In case of melting the pig iron containing more than 0.17 per cent Ti, net work and eutectic structures of graphite appears.
2) Dendritic austenite is seen in the microstructure and, ferrite and pearlite are appeared in its matrix.
3) Although carbon and silicon contents are high, the mechanical properties such as tensile and bending strength are much greater than those of ordinally cast iron.
4) The appearance of such a net work mentioned above differs by the melting time. Such structure can not be obtained in the first melt, even the pig contains Ti. However, it is obtained gradually with the elapse of melting time of cupola.
5) The cooling curve obtained by thermal analysis shows that super cooling is occurred when Ti content is high. It is supposed that most of Ti exists in the form of TiC in molten iron.
