Abstract
In order to study the effects of temperature on the nature of non-metallic inclusions, measurments were done at 1000-1400°C on the reactions between 5-6% Mn-Fe alloy and synthetic oxide which filled a 5mm dia. and 15mm depth hole in the alloy. The results obtained here are as follows: Many oxide particles, precipitated like a layer around the buried oxide. The thickness of precipitation zone increased with increase in temperature, time of heating and the concentration of FeO in the synthetic oxide. The oxide particles had various shapes including spheres. Size of particles increased as the time increased. It was shown from the analysis by EPMA that Mn concentration in the matrix around the particles of irregular shapes decreased, and that Mn/Fe ratio in the particles increased with increasing temperature and time. Accordingly it is supposed that the oxide particles grow by diffusion of manganese from matrix to the particles. Spheric particles, most of which were made of silica or silicates, distributed throughout the precipitation zone. It is supposed that silicon in these particles came from the synthetic oxide by diffusion.
