焼結マンガン鋼の研究 (第2報) 添加炭素量と熱処理の影響

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Effects of the carbon addition and heat treatment on physical and mechanical properties were studied. The results obtained were as follows :<BR>(1) The addition of carbon to iron-manganese alloys lowers the density and increases the porosity, but has a goot effect of improving the sintering between iron and manganese.<BR>(2) Sintered manganese steel with the austenitic structure has good mechanical properties, particularly high impact energy, though the porosity of sintered compacts is higher than 150.<BR>(3) In order to obtain homogeneous austenitic microstructure it is necessary to add high manganese and high carbon, for example C 2.0% for Mn 100 or C 1.2% for Mn 20% with sintering at 1200°C. (4) Mechanical properties are little affected by solution-treatment, but injured by heating at above about 400°C after solution-treatment. The hardness has the maximum value at a temperature of 500-600°C, since the platelet carbide precipitates at these temperatures.
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