On the Equilibrium Diagram of Ternary Alloy System of Iron, Manganese and Carbon
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The diagram of the ternary alloy system of iron, manganese and carbon was determined by thermal analysis, thermal dilatation, magnetic analysis, microscopic examination and X-ray analysis, with・alloying materials of electrolytic iron, distilled manganese and sugar charcoal. As for primary crystal surfaces, there were the following seven kinds of primary crystal surfaces : (1) δ iron ternary solid solution : ternary solid solution of δ iron in which a small amount of manganese and carbon are dissolved, (2) γ iron ternary solid solution : ternary solid solution of γ iron in which manganese and carbon are dissolved, (3) C ternary solid solution : ternary solid solution of carbide (Fe, Mn)_3C consisting of Fe_3C which contains manganese, (4) δ manganese ternary solid solution : ternary solid solution of δ manganese in which a small amount of iron and carbon are dissolved, (5) γ manganese ternary solid solution : ternary solid solution of γ manganese in which iron and carbon are dissolved, (6) βC ternary solid solution, in which iron is dissolved in βC solid solution of manganese and carbon binary alloy, (7) αC ternary solid solution, in which iron is dissolved in αC binary solid solution of manganese and carbon. Intersecting one another, these surfaces gave six kinds of peritectic lines, four kinds of eutectic lines, two peritecto-eutectic points and one ternary eutectic point. In the solid state, three kinds of peritecto-eutectoid reactions and four kinds of eutectoid reactions were observed. Moreover, fifteen eutectoid lines, three peritectoid lines, three peritecto-eutectoid points, four ternary eutectoid points and forty six solubility surfaces were confirmed. The cause of the weathering of iron alloys of high manganese and high carbon was plainly understood from the complete diagram of the system. In other words, it was shown that the weathering could be attributed to the disintegration of αC solid solution or of γC solid solution or of both owing to the moisture in atmosphere, and accordingly some appropriate means to prevent the alloy from being weathered could be devised.
- 東北大学の論文
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関連論文
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