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28 巻, 6 号
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研究論文
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—共晶集団について—大平 五郎, 井川 克也1956 年 28 巻 6 号 p. 403-409
発行日: 1956/06/25
公開日: 2012/11/09
ジャーナル フリーThe eutectic of cast iron forms with a spheroidal crystallization front. The pattern, the number and the size of these eutectic cells vary with the amount of primary austenite and a small amount of so-called third elements, i. e. oxygen, sulphur, manganese and calcium-silicide.
The results obtained are as follows :
i) The number of eutectic cells of pure Fe-C alloy increases with carbon content up to 4.11% C and decreases at higher carbon contents. The former eutectic cells contain flaky graphite and the latter eutctic graphite.
ii) Small amount of oxygen and sulphur decreases the number of eutectic cells of oxygen in cast iron and converts flaky graphite into eutectic.
iii) The inoculation of calcium silicide to the cast iron melts containing oxygen or sulplur increases the number of eutectic cells and converts eutectic graphite into flaky.
iv) The addition of manganese to the cast iron containing sulphur can not completely convert eutectic graphite to flaky.
v) The types of manganese sulphide vary with the ratio Mn/S from massive angular type to elongated anchor type according to the decrease of the ratio.
vi) The inoculation of calcium silicide to the cast iron containing sulphur and manganese produces the small granuler type of manganese sulphide.抄録全体を表示PDF形式でダウンロード (1119K) -
千田 昭夫1956 年 28 巻 6 号 p. 410-418
発行日: 1956/06/25
公開日: 2012/11/09
ジャーナル フリーThe property of molten pig iron was improved by passing the iron through coke layer and this process may be applied to the pretreatment of molten iron, especiaily in case of manufacturing nodular graphite cast iron.
The reason why the property was improved by the process, seems to be owing to the inoculation of carbon and the decrease of oxide in the iron.抄録全体を表示PDF形式でダウンロード (1306K) -
草川 隆次1956 年 28 巻 6 号 p. 418-424
発行日: 1956/06/25
公開日: 2012/11/09
ジャーナル フリーSpheroidal graphite cast iron may give high strength, high hardness and sometimes high ductility because of both spheroidalization of graphite and probably modification of matrix.
In the present work, high-carbon and high-silicon cast iron, which apt to poduce spheroidal graphite, has been subjected to the additions of Mo, Ni-Mo and Cu-Mo and treated with Mg. Microstructure and hardness tests have been given to the matrix in regard to the effects of these additions.
Following results have been obtained.
(1) High-carbon and high-silicon cast iron may give super cooled structure in matrix both by the additions of Mo, Ni and Mo or Cu and Mo, and by subsequent Mg-treatment, so-called bainite structure tends to form. And Mg-treatment yields the iron of higher hardness of 30 to 40 HRC than that of non-treatment.
(2) When Si content is varied in the specimens to which Ni and Mo or Cu and Mo are added, hardness of the specimens without Mg-treatment is not so responsible to various amounts of Si additions, while the specimens Mg-treated dicreases in hardness with more Si content.抄録全体を表示PDF形式でダウンロード (858K) -
—寒川合成砂の強度（抗圧力，剪断力）—藤本 留吉1956 年 28 巻 6 号 p. 424-430
発行日: 1956/06/25
公開日: 2012/11/09
ジャーナル フリーThe grain size distribution and permeability of this synthetic sand have already been described in Rept. II.
In this report, the influences of moisture content, number of ramming, bentonite addition upon green strength (compression and shearing force) of 4 kinds of sands are studied.
The gists of results are as follows :
a) Moisture content in which the green strength (compression and shearing) becomes max. is a little heigher content of moisture than that the permeability value makes greatest.
b) As to permeability, when the number of ramming is increased, the moisture content in which a max. strength is exhibit shall be shifted towards a lower content of moisture.
c) Ralation between compression FC and green hardness HB of this synthetic sand can be illustrated with a straight line in this case, and the fallowing empirical formula is obtained i. e.
compression FC=40 HB−2400 from general form FC=mHB+C, where C : const. m : tangent.
d) If bentonite contents increase, both max. strength and its moisture percent increase.
e) In change of strength due to ramming and moisture percent the author found that the synthetic sands No. II, No. III or No. IV are most stable and excellent.抄録全体を表示PDF形式でダウンロード (751K) -
—ガス発生について—牟田口 元堂1956 年 28 巻 6 号 p. 431-434
発行日: 1956/06/25
公開日: 2012/11/09
ジャーナル フリーIt is thought that the gas pressure caused by pouring the mold cavity is determined by the following three factors, i. e.,
(1) The volume of mold cavity, which is equivalent to the pattern contour,
(2) the rate of gas evolution from the mold, and
(3) the rate of gas permeability in the mold.
The factor (1) is influenced by the pouring velocity of the melts. The rate of gas evolution (dv/dt), when a small amount of melt is poured into a considerably large mold, increases rapidly at the initial period of pouring and it decreases gradually hereafter.
But, the gas volume generated from a closed mold, can be expressed as an integrated value of the rate of gas evolution.
The rate of gas permeability which pass through the mold, in general, is expressed by a permeability value.
As this value is expressed in the unit of velocity, the gas volume evolved is given by the integration of the permeability value.
Accordingly, the gas volume in mold cavity can by represented by the difference of the two values mentioned above.
The variation of gas pressure, and the decreasing the weight of sand specimen is measured this time by giving rapid heating on molding sands, and the results close to the expectation could be taken in the case of measuring the decrease of sand weight.抄録全体を表示PDF形式でダウンロード (532K)
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