Nitrogen gas was introduced in the molten grey cast iron containing 0.028%Ti. A nitrogen analyzer Thermatic “O-N” was used for nitrogen analysis. The graphite structure was analyzed using an image analyzing computer QTM 720. Fine graphite precipitates during solidification in the cast iron nitrogen treated. Nonmetallic inclusions such as TiN, MnS, SiO
2, TiS and (Ti, Mn)S are found by microscopy and EPMA analysis. Nitrogen less than 100ppm reduces the number of eutectic cells in hypoeutectic cast iron. Nitrogen, however, does not have any influence on the primary graphite in hypoeutectic cast iron.
抄録全体を表示