耐衝撃工具鋼の研究 (II) : C および V の影響について

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The authors studied on the effect of silicon on the properties of shock-resisting steel containing 0.5% C, 1.5% Cr, 2.2% W and 0.2% V in the first report. (Tetsu-to-Hagane. Vol.40, No.10, p.1001) In this report, the effect of C and V on the transformation, the hardenability the as-quenched and tempered hardness, and the mechanical properties were investigated. The results obtained were as follows : (1) The critical point was lowered with the carbon content and raised with the vanadium addition. The Ms-point was lowered with the carbon content. (2) The hardenability increased with the carbon content, and decreased with the addition of vanadium. (3) The full hardness was obtained by the oil quenching from 860℃ to 940℃, and as the carbon content decreased, a slightly higher austenitizing temperature was necessary for obtaining the full hardness. (4) During tempering, the Charpy impact value increased by a tempering temperature up to 200℃, then decreased at higher temperatures and minimum impact value was exhibited at a temperature between 300℃ and 350℃. As the carbon content increased, the yield point and the hardness increased and the impact strength decreased.
社団法人日本鉄鋼協会の論文
1956-08-01