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41 巻, 1 号
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研究論文
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市川 理衛, 黒淵 達史1969 年 41 巻 1 号 p. 3-13
発行日: 1969/01/25
公開日: 2012/10/03
ジャーナル フリーPorosity is caused hydrogen which is absorbed into molten aluminum alloy and is released during solidification is one of the casting defects. To investigate the effect of alloying elements upon the formation of such porosity, specimens were heated at the temperatures of 550 to 800°C in an atmosphere of water vapour and porosity in it was measured by checking on the density of the specimens. Experimental results were: In case of Al-Cu, Al-Si, Al-Zn and Al-Mg the maximum porosity was produced when they were heated at partially molten temperatures, the minimum being formed when they melted down just completely. The porosity was increased with increasing the partial pressure of water vapour. An addition of Mg resulted in increasing the porosity more remarkably than that of Cu, Si, or Zn; In case of AI-Mg an addition of small amount of Be or Ca reduced the porosity extensively and that of Ce, Li, or P having a little less effects on it. The addition of Zn, In, Ge, or B had few effects on the porosity, while that of Th, Ti, V, Zr, Cu, Bi or Cd tended to increase the porosity.抄録全体を表示PDF形式でダウンロード (1024K) -
岡林 邦夫, 百瀬 敬吾1969 年 41 巻 1 号 p. 13-20
発行日: 1969/01/25
公開日: 2012/10/03
ジャーナル フリーCarbon-clay slurry is well used for sand mold washes. The combustibility of carbon of the slurry is an important factor having influence upon the condition of the surface of castings. In experiments, carbon such as coke, amorphous or crystalline graphite was mixed with kaolin or bentonite to make mold wash. To study the combustibility of those mold washes measurement was made on samples of a thin film form. The method of measuring the combustibility of mold washes in a thin film form was newly designed by the authors and proved successful. As a result of the experiment, it was known that coke, natural amorphous graphite and natural crystalline graphite stood in order of the combustibility, namely coke showing the highest combustibility and natural crystalline graphite the lowest. The combustibility of mold washes was reduced by adding clay to carbon material.抄録全体を表示PDF形式でダウンロード (829K) -
生井 亨, 千田 昭夫1969 年 41 巻 1 号 p. 21-29
発行日: 1969/01/25
公開日: 2012/10/03
ジャーナル フリー18 kinds of grey cast irons of extremely low sulphur content were produced by desulphurizing molten iron in a DM converter of 500 kg capacity. The sulphur content ranged from 0.001 to 0.0144%. The experimental results were: 1) Graphite structure became finer with decreasing the sulphur content, and showed a uniform eutectic when the sulphur content was reduced to less than 0.0012%. 2) Tensile strength, yield strength and fatigue resistance were improved by reducing the sulphur content, particularly the tensile strength and fatigue resistance increasing remarkably when the sulphur content was reduced below 0.003%. 3) In case sulphur content was lower than 0.009%, the growth of cast iron was much reduced, for example, approximately to an extent of one seventh.抄録全体を表示PDF形式でダウンロード (1109K) -
雄谷 重夫, 松浦 佑次, 鈴木 鎮夫, 神尾 彰彦1969 年 41 巻 1 号 p. 29-37
発行日: 1969/01/25
公開日: 2012/10/03
ジャーナル フリー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.抄録全体を表示PDF形式でダウンロード (1378K) -
今橋 博道, 土屋 勝, 岡田 千里1969 年 41 巻 1 号 p. 38-45
発行日: 1969/01/25
公開日: 2012/10/03
ジャーナル フリーPure copper castings are used for water jacket to be used at high temperatures because of their excellent heat conductivity. Solidifying structure of the castings widely varies in dependence to the amount of impurities, kinds of mold materials, thickness of castings and pouring temperature. The structure has an important effect upon the performance of the castings under service conidtions at high temperatures. A study was carried out in a manner in which test pieces of three types of solidification structure were subjected to examination. They included square rods of 0.5×0.5×20 mm of colammar structure and rods of 5 to 10 mm and 0.3 to 0.5 mm in diameter having coarse equiaxial strucure and fine one respectively. The measuremant of the mechanical properties was made at various temperatures ranging from room temperature to 600°C and the creep rupture and thermal fatigue strength tests at 400°C. The experimental results were: 1) High temperature properties such as tensile strength and creep strength was significantly influenced by the solidification structure. 2) High temperature strength was the highest in case of castings of fine equiaxial structure, it being the lowest in case of those of columnar crystal structure. 3) The most remarkable difference in high temperature strength was found with respect to creep rupture strength at 400°C. 4) There were always observed solidification structure on the surface of the fracture of test pieces for tensile and creep tests. 5) The solidification structure had the same effect on the fatigue strength as on the tensile strength at high temperatures.抄録全体を表示PDF形式でダウンロード (1473K)
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