Viscosity of Liquid Fe-C-Si-Alloy

Abstract

Viscosity of liquid Fe-C-Si alloys was determined by measuring the logarithmic decrement of oscillation of the crucible containing liquid alloy in the temperature range between 1300 and 1650°C Empirical equation obtained by water, mercury and liquid tin was applied to the calculation of viscosity of liquid alloys.
In binary alloys, viscosity of liquid iron decreased almost linearly with carbon content and decreased slightly with silicon content. Any abnormal or abrupt change of viscosity was not observed. Activation energy of viscous flow, also, decreased with increase of carbon or silicon. But, in the case of ternary alloys, viscosity of Fe-C alloys increased with silicon content, especially in higher carbpn alloys and activation energy showed a tendency to increase. Some considerations were given to the experimental results, though it was difficult to explain the cause of the increase of viscosity in ternary alloys.