Experiments were carried out on the solidification of iron-manganese alloys containing sulphur and carbon. The alloys were solidified under controlled conditions in a travelling furnace constructed especially for the investigation. Qualitative and quantitative metallography and electron-probe microanalysis were used to determine the solidification structure, dendrite arm spacings, solute concentration profiles and inclusion compositions. The results were interpreted in the light of existing knowledge and concepts especially developed for the purpose of this investigation. / Thesis / Doctor of Philosophy (PhD)