含 Cu, Al 可鍛鑄鐵の研究

概要

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Graphitisation times, mechanical properties and fluidities of malleable castings containing 2.4% carbon, 0.7% silicon, 0.5 (1.0, 1.5)% copper and 0.05 (0.1, 0.3)% aluminium are studied : (1) The addition of slight amount of aluminium effects strongly to shorten the graphitisation time of first stage, e. g. from 16 hr 30 min. to 2hr 15min. (2) All specimen casted in sand mould 5-40mm thick show white pig fracture. (3) Fluidities of this molten metal are injured by addition of aluminium, but improved this injured fluidities by addition of copper. (4) The best mechanical properties are obtained by precipitation hardening treatment after graphitisation of first stage, e. g. tensile strength 78kg/mm^2 and elongation 4%. (5) The addition of aluminium effects decreasing the tensile strength and elongation percentage and transform the shape of graphite from sphere to star and the addition of 0.3% aluminium causes to precipitate the primary graphite.
社団法人日本鉄鋼協会の論文
1951-05-25