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31 巻, 8 号
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研究論文
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雄谷 重夫, 本間 梅夫1959 年 31 巻 8 号 p. 699-707
発行日: 1959/08/25
公開日: 2012/10/31
ジャーナル フリーThis is the first progress report on the study of melt quality of 85-5-5-5 red brass. Subjects discussed include:
(a) The definition of “melt quality” and the various factors which regulate melt quality.
(b) Influences of different melting conditions on the fracture appearances of 76×20×152mm. blocks cast in core sand and chilled against cast iron on a 20×152mm face. Macrostructures of the sections of chilled casting are also related to the corresponding fracture appearances.
(c) The nature of each characteristic pattern on the fracture on the basis of microstructure, intrior casting defects and mechanical properties.抄録全体を表示PDF形式でダウンロード (1217K) -
百瀬 恒夫, 伊豆 董1959 年 31 巻 8 号 p. 707-711
発行日: 1959/08/25
公開日: 2012/10/31
ジャーナル フリーMany papers on the influence of the special rare elements upon the formation of spheroidal graphite have been published, but few of them refer the mutual effect of these elements.
By adding titanium and antimony to Yawata nodular pig iron which has recently been produced, the authors made investigation into the mutual effect of both elements on the spheroidization of graphite.
The results obtained can be summarized as follows.
(1) The interfering effect of titanium on the graphite spheroidization is not so great, when it is only added. The degree of spheroidization is 85 per cent for the content of 0.10 per cent of titanium.
(2) The harmful effect of antimony is also small, when it is only added. The degree of spheroidization is 80 per cent for the content of 0.013 per cent antimony.
(3) However, the interfering effect is much increased, when the both elements added together. The degree of spheroidization decreased to about 40 per cent for the content of 0.10 per cent titanium and of 0.003 per cent antimony.
(4) Therefore, the content of titanium and antimony should be less than 0.07 per cent and 0.003 per cent for the magnesium treated iron and 0.08 per cent and 0.003 per cent for the nodular pig iron, respectively.抄録全体を表示PDF形式でダウンロード (647K) -
菊地 政郎1959 年 31 巻 8 号 p. 712-718
発行日: 1959/08/25
公開日: 2012/10/31
ジャーナル フリーThe results obtained are summarized as follows.
(1) For getting the perfect graphitization(with no free cementite separation)in Vacuum-melted cast iron, Si% had to be increased with decrease of C% (1.1%Si for 3.51%C), (3.0%Si for 2.41%C), (2.7%Si for 2.14%C), (3.3%Si for 1.92%C). And in steel range, a smaller quantity of Si%, as compared with low carbon cast iron, was enough to get the massive graphite and pearlite structure without Primary cementite separation (1.7%Si for 1.29%C), (1.7%Si for 1.03%C).
(2) Si% must be taken into consideration for the distinction between cast iron and carbon steel. The author thinks, to distinguish between cast iron and steel in the Fe-C-Si equilibrium diagram, it is more reasonable to define the left side of Ec line (fig. 2) as carbon steel and right side as cast iron.
(3) The rise of tensile strength, in the range of author's experiment, due to decrease of C% in cast iron was about 10kg/mm2 both for atmosphere-melted (4.04-2.14%C) and vacuum-melted (4.04-1.7%C) cast irons.
(4) Tensile strength of vacuum-melted carbon steel changed remarkably by C% in the case of author's experiment, the change reached about 35kg/mm2.
(5) The notch effect of flake graphite for tensile strength of cast iron may be larger than that of eutectic graphite.
(6) Eutectic graphite and ferrite structure having 30-40kg/mm2 tensile strength was generally gained by vacuum-melting of cast iron. In carbon steel range, massive graphite and pearlite structure with 50-85kg/mm2 tensile strength was obtained by vacuum-melting. So a great strides in tensile strength was observed on entering into steel range fron cast iron range.抄録全体を表示PDF形式でダウンロード (693K) -
上田 俶完1959 年 31 巻 8 号 p. 719-723
発行日: 1959/08/25
公開日: 2012/10/31
ジャーナル フリーTitanium is known as graphitizing element of malleable cast iron. The author has investigated the mechanism of this graphitizing effect. The results obtained are as follows;
(1) Titanium in malleable cast iron combines with nitrogen in iron at first and forms TiN. After total nitrogen converts to TiN, TiC appears.
(2) Increase of titanium in malleable iron causes decreases of acid-soluble nitrogen and graphitizing period. And those become minimum when titanium content balances nitrogen content as TiN, and more titanium addition is no effect.
(3) Therefore, the graphitizing effect of titanium may be due to its combination with nitrogen in iron.
Next, preheating of white iron is effective, when nitrogen content is higher than that of TiN. This is taken to be due to the conversion of nitrogen in iron to silicon nitride. When the nitrogen content is about the same as that of TiN, the effective preheating is observed, in which the unstable nitrogen and titanium convert to TiN. More titanium content shows no preheating effect.抄録全体を表示PDF形式でダウンロード (577K) -
原田 梅治, 西山 圭三1959 年 31 巻 8 号 p. 724-732
発行日: 1959/08/25
公開日: 2012/10/31
ジャーナル フリーIn this report, we disclose the results of our investigation and research on the types of scabs which appeared in natural sand mold and synthetic sand mold, both of them are almost equal in their green properties. At the same time, our research, of cource, was made on their respective hot-properties.
In casting tests, we used the test pattern of AFS Sand Division Committee 8-J, and molten grey iron were poured in their molds at 1320°C (it is the value of the optical pyrometer which was learned through our naked eyes).
The conclusions from our tests are as fallows:
1) The natural sand mold is different from the synthetic one in their hot-properties and in the appearance of scabs.
2) The wrapped scabs (B-Scab) and found in the natural sand mold, and the expansion-scabs in the synthetic sand mold.
3) The hot compressive strength of the natural sand mold is influenced by the kind of binder to be used.
4) The hot deformation in the natural sand mold is greater than that in the synthetic one.
5) Rat-tail defect is liable to appear in the mold sand whose expansion and hot compressive strength are remarkablly great.
6) The natural mold sand is different from the synthetic one in the mode of combination of silica sand, clay and water is the mold sand.
7) In the mixture of the synthetic mold sand, a better method of mixing silica sand, clay and water in itself should be investigated to obtain the state of combination of the natural mold sand.抄録全体を表示PDF形式でダウンロード (994K) -
南郷 忠勇1959 年 31 巻 8 号 p. 732-741
発行日: 1959/08/25
公開日: 2012/10/31
ジャーナル フリーSynthetic sand is usually considered to be consist of three components sand grain, clay and water-when it's examined in composition or properties. But here we have dealed with synthetic sand as two component-sand grain and humid clay-and have examined the relation between compressive strength and humid clay or sand grain. As the result of this work experimental formula is obtained.
Nowadays many reports are present in which water is regarded as important factor, so we deal with water as water ratio-ratio of water against clay-which (regulates) the combined state of synthetic sand. In this paper the amount of humid clay-sum of clay and water-is used as amount of binder for sand grain. In the case of dry state, the binder is clay only.
After all, in the case of green or dry state, compressive strength can be applied in following experimental formula. Also, a few interesting results have been attained.
Green Comp. Str. (kg/cm)=ηmΨQ+ρ
Dry Comp. Str. (kg/cm)=η'mΨ'C+ρ'
m : Water ratio
Q : Amount of binder, (water)+(clay)
C : Amount of clay
η·η'·Ψ·Ψ' : constant exponent
ρ·ρ' : variable number with m.抄録全体を表示PDF形式でダウンロード (863K)
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