特殊鑄鋼の研究 (VIII) : Cr-Mo 鑄鋼の機械的性質に及ぼす Ni の影響

概要

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Influence of Ni on the hardness and impact resistance of Cr-Mo cast steels containing Cr 1%, Mo 0.25% was investigated. The specimens were oil quenched from Ac_3+50℃ and subsequently tempered at 180∿700℃. From the results of these studies, the author obtained the following conclusion : - In the case of low carbon content, the hardness of Cr-Mo cast steel rapidly increases as the Ni addition increases, but in higher carbon content, it does not increase hardness any more. At a low tempering temperature the hardness increases with the Ni content, but when the tempering temperature is elevated, the effect of Ni is slightly affected. Though Ni has a marked effect in impact resistance up to 2%, with further increase in Ni addition the impact resistance suddenly decreases. The "first" temper-brittleness occurs at the tempering temperature of 300∿400℃. In case, however, the tempering temperature supercedes 500℃, the toughness is sensibly enhanced. In short, Ni addition gives an excellent results for the low carbon, Cr-Mo steel, but not so for cast steel of every kind.
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