ねずみ鋳鉄の共晶セル組織と機械的強度に及ぼす冷却速度の影響

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A study has been made on the cooling rate, eutectic cell structure and mechanical strength of round, square and triangular castings of different forms having the same sectional area. It was found that the cooling rate, even for the same sectional area, varied according to their forms and that it became greater in the order of round, square and triangular castings. The same was true with the number of eutectic cell and the mechanical strength . On the basis of these results, the following theory was established. (1) The cooling rate of castings can be determined by the ratio of volume to surface area. (2) A Iinear relationship, by the logarithmic graph paper, can be established among the n th power of modulus (M) of castings of different forms, the lapse of time (t), the cooling rate (V_s) and the number of eutectic cell (N). The relation can be expressed as t=AM^<nf>, V_s =BM^<-nf>, N=HM^<-nf> where A, B and H are constant and f value in each case becomes f≒1. The values of n obtained were 2.0 for a round bar, 2.3 for a square bar and 2.5 for a triangular bar. (3) Among the cooling rate, the mechanical strength (tensile strength σ_B, Brinell hardness H_B) and the number of eutectic cell, the relationships σ_B=C_1V_s^f, H_B=C_2V_s^f, N=GV_s^f were obtained. (4) Between the number of eutectic cell and mechanical strength, (σ_B=J_1N^f and H_B=J_2N^f, where C_1, C_2 G, J_1 and J_2 are constant, were obtained.
社団法人日本材料学会の論文
1982-01-15

ねずみ鋳鉄の共晶セル組織と機械的強度に及ぼす冷却速度の影響

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