炭素を含む事極めて尠き鐵-マンガン及鐵-マンガン-X 合金の研究
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For this study, extra low carbon ferro-manganese (C=0.22%, Mn=80.50%, Si=1.49%) was specially prepared. By mixing the ferro-manganese and Armco iron, the samples were produced in a high frequency electric induction furance with special care taken for preventing the samples from carburization. The compositions of the samples were determined by chemical analysis and their carbon contents were always kept under 0.06%. Ar and Ac transformations were determined by the thermal dilatation method. Nextly, the mechanical properties of the forged samples were tested in the condition of annealing, quenching, and tempering after quenching. The relation between the hardness and the composition is shown in Fig. 4. The temperature at which the hardness of the samples begins to drop by the tempering of the quenched samples, is about 400℃. As a well-known fact, the hardness of the ordinary martensite containing carbon begins to drop, by tempering, at a temperatures of about 200℃. In comparison with these two facts, we know some difference of temperatures, at which the hardness begins to drop. From the above observation, the hardening of iron-manganenese alloys containing extra low carbon is perhapes due to unstable α solid solution or the precipitation of small particles of α solid solution from γ solid solution. As there is almost no carbon in the samples used, the hardness drop of ordinary martensite at about 200℃ May not be seen. The new fact is also found that the machinability of the iron-manganese alloy is depended upon its carbon Content.
- 社団法人日本鉄鋼協会の論文
- 1937-08-25
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- 炭素を含む事極めて尠き鐵-マンガン及鐵-マンガン-X 合金の研究
- 炭素を含む事極めて尠き鐵-マンガン及鐵-マンガン-X合金の研究