特殊鑄鋼の研究 (X) : Mn-Si 鑄鋼の機械的性質に及ぼす Cr 及び W の影響

概要

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Influence of Cr and W on the hardness and impact resistance of Mn-Si cast steels, containing Mn 1%, and Si 0.8%. were tested after oil quenching and tempering. The results obtained were summarized as follows : - The hardness of Mn-Si cast steel rapidly increased with about 1.6% Cr addition, but a higher Cr addition did not enbance the hardness any more. On the contrary the impact resistance was markedly reduced with the Cr addition increase. The first temper brittleness took place at 300°∿400℃ when the Cr content was small, while if Cr content was over 2%, it was very difficult to recover the impact resilience even if the tempering temperature was elevated at 600℃. With addition of 1.5∿2.0% W to Mn-Si cast steel, containing 1% Mn, and 0.6% Si, the hardness and impact resistance showed an excellent value in these steels, and the high strength and tenacity were obtained by addition of 1.5% W. Addition of 0.8% W to Cr-Mn-Si cast steels, containing 1% Cr, 1% Mn and 0.6% Si, developed an excellent resilience when the W content is about 0.8%. According to the author's conclusion from the present test, the Cr-Mn-Si-W cast steel is superior in strength and toughness as compared with the Mn-Si-W steels.
社団法人日本鉄鋼協会の論文
1952-03-25