Matsusiro Hamasumi1, Goro Ohira1
The equilibrium diagram of Fe-Cu-Fe3C presented by Ishihara, Ishigaki and Yonekura in 1932 is revised in the present investigation, The research was carried out by thermal and dilatometric. analysis and by microscopic examination, using electrolytic iron, electrolytic copper and pure white cast iron as raw materials. The following three points are of special value. to mention. (1) The monoteetic reaction suspected by many authors do not exist on the Fe-Cu side. The region consisting of two liquid layers extends from the Cu-Fe3C side so closely to the Fe-Cu side and the critical point lies at 1435° and at the composition containing 40% of Cu, 60% of Fe and 0.1% of C. (2) The ternary eutectoid of Fe, Cu and Fe3C lies at 702° and it contains 6.5% of Cu and 0.85% of C. The structure consists of alternate layers of ferrite and cementite, and the fine globules of copper in ferite. (3) The equilibrium state of copper corner is precisely investigated and a peritecto-eutectic point was found of 1092°, which contains 2.7% of Fe and 0.008% of C. The whole results obtained are represented in the diagram of Fig. 36.
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