鑄鋼に關する研究 (I) : 高温に於ける各種性質並びにオーステナイト粒度に關する二, 三の實驗

概要

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Studiess were made on the various properties at high temperature, and austenite grain size of 0.1∿0.9% C steel. The results obtained were as follows : - (1) Hypo-and hyper-eutectoid steel showed lower tensile strength than eutectoid steel at any temperature, and the tensile strength increased with increase of the carbon content up to 0.9% C. Therefore, high carbon steel was superior in thermal tensile strength. (2) The creep limit increased in proportion to the carbon content, and decreased with rise of the temperature. Therefore, high carbon steel was harder to deform and fracture than low carbon steel at high temperature. (3) Evident difference was not found in the resistance to scaling, but 0.5% carbon steel was better than 0.15% carbon steel. (4) Slight inclusion of special elements originated from raw materials (Cr, Ni, Mo, etc) improved the above properties of as cast steel of the same carbon content. (5) The anstenite grain size was large and disproportional. (6) The grain-refinement from α to γ by heating was small. (7) The anstenite grain size became large by over-heating, but it was refined by the grain refining treatment. (8) A test piece on which anstenite grain refining treatment was applied by perfect homogenizining showed the best impact value.
社団法人日本鉄鋼協会の論文
1952-11-25