耐摩耗ダクタイル鋳鉄の溶製

概要

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A study was made to determine the adequate amount of nickel, chromium and molybdenum enough to obtain the desired hardness in as-cast state in accordance with the wall thickness of the product. Experimental variables were as follows : Nickel percent : 0, 1.0, 2.0 Chromium percent : 0.5, 1.0 Molybdenum percent : 0.5, 1.0 Sample size : 30, 45, 60 mm in diam. Molds : green, dry To simplify the experiment a "latin-square" design was applied and the results obtained were as follows. (1) Bainitic structure was obtained when 2% nickel, 1% chromium and 1% molybdenum had been added. (2) The mixed structure of eutectic cementite and bainite was obtained in the low-silicon range (1.5% Si) when each content of nickel, chromium and molybdenum was 1%, respectively. (3) From the conclusions mentioned above, the following experimental formula to determine nickel, chromium and molybdenum amount required for 300∿600 Brinell hardness number was developed : Dry mold……H_B=114.4X-68.2XY+178.7 (Y+Z)+9.9 Green mold……H_B=35.2X+195.0Y+58.2XY+195.3Z-10.0, where X=nickel %, Y=chromium %, and Z=molybdenum %.
社団法人日本鉄鋼協会の論文
1962-05-01