満俺の添加による鐵-セメンタイト-硫化鐵合金の平衡状態圖の變化

概要

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By thermal and microscopic analyses 110 Fe-Fe_3C-FeS-Mn alloys containing about 0.45%, 0.88% and 1.9% Mn have been studied. As to these three series of alloys, isothermal, projectional and structural diagrams have been constructed. As the manganese content increased, the range in which two liquid phases coexis'ed widened in the direction of the low carbon and low sulphur composition side. The critical point of the monotectic reaction surface in alloy series containing about 1.9% Mn was about 1355℃, 7.2% S and 0.53%C, while that in those containing no manganese was 1, 300℃, 8% S and 1.07%C. The experimental result has made clear the mechanism of desulphurization and the decrease of the red shortness in steel due to addition of manganese. As the manganese content increased, the monotectic temperature rose at which the sulphide-rich-melt was separated from a homogeneous melt and came up to the surface forming slag. It is a well-known fact that in steels containing some amount of manganese the manganese-rich sulphide globules exist in the austenite grains, and the red shortness is little. Moreover, as the manganese content increased, the binary sulphide eutectic temperature rose, at which the sulphides were separated on grain boundaries of austenite. Therefore the melting of the boundaries takes place at higher temperature and the red shortness is decreased
社団法人日本鉄鋼協会の論文
1934-03-25