The surface tension of pure Fe, Co, Ni, (Fe, Co, Ni)-C alloys and (Fe, Co, Ni)-(Mo2C, WC) alloys was investigated. In all the alloys investigated, the effect of carbon addition on the surface tension is not remarkable. This result is explained qualitatively by negative adsorption of carbon on the liquid surface, or by the change of surface tension factor reflected in our semi-theoretical equation proposed in our 1st report.
