高圧力下で凝固した高鉛青銅の組織と機械的性質
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概要
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High leaded tin bronze such as Cu-20%Pb, 74%Cu-6%Sn-20%Pb and 80%Cu-10%Sn-10%Pb was solidified within a metallic cylinder under high hydrostatic pressure ranging from 1,400 to 3,000kg/cm2. Ingots thus solidified consisted of outer columnar layer and inner coarse equiaxial crystal zone, where the columnar crystals centripetally grew from the surface of the ingots. The formation of fine and homogeneous equiaxial structure was favoured by decreasing the temperature of molten metal at which the pressure was applied to the temperature of its own liquidus isotherm. The typical structure was characterized by the fact that it consisted of thin arms and cells of alpha dendrites having narrow arm spacing and had a distribution of fine lead and (α+δ) eutectoid homogeneously dispersed. The fine structure was further favoured by the method in which pouring temperature was lowered, pressure being rapidly applied and grain refining elements being added to the molten metal. The bronze alloys of fine structure had neither gaseous nor shrinkage porosity and showed excellent mechanical properties. This improvement was particularly remarked in the Cu-20%Pb alloy, the strength, elongation, hardness and impact strength being increased two or three times as much as those of ordinary alloy castings. This tendency was less remarkable in the 74%Cu-6%Sn-20%Pb and 80%Cu-10%Sn-10%Pb, but there was always increased toughness in those alloys solidified under high hydrostatic pressure.
- Japan Foundry Engineering Societyの論文
Japan Foundry Engineering Society | 論文
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