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29 巻, 12 号
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研究論文
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音谷 登平, 徳永 洋一1957 年 29 巻 12 号 p. 831-837
発行日: 1957/12/25
公開日: 2012/11/05
ジャーナル フリーPure Fe-C-Si-Ti alloy(0.1∼0.4% Ti) was melted in an alumina crucible, using a Tamman furnace. Adding 0.001∼0.020% of Te to molten iron at 1380°C, it was cooled in the furnace at a rate of 60°C/min. Relation between thermal analysis curves and microscopic structures was investigated. For subsequent experiment, Fe-C-Si alloys or coke pig irons containing 0.2% Ti were remelted in a graphite crucible in a kriptol furnace. After tellurium addition, molten iron was poured into sand mould to investigate the structure and hardness.
The results obtained are as follows : —
1). Up to a critical amount of tellurium addition, the graphite structure changes from eutectic to coase flaky form. But excess additions produce fine eutectic graphite again.
2). Thermal analysis curves show that tellurium addition of critical amount slightly lessen undercooling in the eutectic solidification.
3). It is suggested that the change in the graphite structure of titanium cast iron by tellurium additon is due to the differences in the growth rates of eutectic austenite and graphite during solidification.
4). The eutectic graphite in coke pig iron containing about 0.2% Ti changed to coase flaky form with addition of 0.003∼0.005% Te, and then it was promoted with the inoculation of ferro-silicon.
5). With excess addition of tellurium, a ferrite matrix was formed around fine graphites in titanium cast iron, and the hardness decreased considerably.抄録全体を表示PDF形式でダウンロード (1026K) -
本間 正雄, 大野 秢一1957 年 29 巻 12 号 p. 837-845
発行日: 1957/12/25
公開日: 2012/11/05
ジャーナル フリーThis investigation has been made to confirm how the structure of cast irons is influenced by oxides which construct refractory and clay. Synthetic Fe-C and Fe-C-Si cast irons have been melted in contact with the various oxides under oxidizing atmosphere, argon and carbon monoxide at 1 atm. pressure at 1300° and 1350°C.
The experimental results and the considerations for the results are as follows.
(1). In the case of the oxidizing atmosphere, the structure of synthetic Fe-C-Si cast irons becomes eutectic graphite or white cast iron structure. The structural changes are strongly controlled by oxidation of the oxidizing atmosphere.
(2). In the cases of argon and carbon monoxide, the original flake graphite structure becomes fine in the order SiO2, MgO, BaO or CaO. In the case of Al2O3, the original structure is retained and in the cases of BaO and CaO, the structure is most fine. And the orignal sulphur contents of the cast irons are also reduced in the similar order.
(3). In the case of argon atmosphere, it may be deduced from the thermodynamical consideration that the Fe-C-Si alloys are deoxidized in the following processes.
Si+2O+2MO (S) =M2SiO4
Si+2O+2MO (S) =M2SiO3
(4). In the case of CO atmosphere, it may be considered that the structural changes between flake graphite and fine eutectic graphite structure of Fe-C and Fe-C-Si alloys are due to the changes of sulphur contents of the alloys. In the case of argon atmosphere, it may be considered that the structural changes of Fe-C-Si alloys are due to deoxidation and desulphurization of the alloys.抄録全体を表示PDF形式でダウンロード (1044K) -
阿部 喜佐男1957 年 29 巻 12 号 p. 846-853
発行日: 1957/12/25
公開日: 2012/11/05
ジャーナル フリーThis study was carried out with the purposes to find out the correlated properties of cast irons by testing and to ascertain the excellencies of ordinary cast irons and high grade of cast irons.
Cast iron shows the superiority in compressive strength, dumping characteristic and in acid-proof than steel. Especially, high grade cast iron which produced by the proper melting with the addition of considerably large amount of steel scraps and which made proper inoculation, shows preferable properties.
In the properties like tensile strength, shock, fatigue and rust resisting, cast iron is inferior than steel, but high grade cast iron shows similar good properties with steel. Thus, high grade cast iron can fill up the differenses in properties of ordinary cast iron and steel. However, the properties of high grade cast iron are differed by the methods of melting and inoculation, and if these are made poorly, the properties become inferior.
It has ascertained that the tendencies of decreasing O2 content and of increasing N2 content in cast iron when the additional percentages of steel scraps becomes great.抄録全体を表示PDF形式でダウンロード (880K) -
—型砂の生型強度に及ぼす粘土の不純物及び粘土鉱物の影響—河野 良治郎, 今尾 一右1957 年 29 巻 12 号 p. 853-858
発行日: 1957/12/25
公開日: 2012/11/05
ジャーナル フリーTo know the influences of the quantity and the sorts of clay minerals which composing foundry clays on the green compressive strength of synthetic sands, the authors made the tests on thermal analysis, grain distribution, chemical analysis and the green compressive strength of clays and bentonites wpich yield in Tokai District.
The followings are the results obtained :
a. Most of clays contains kaolinite as a main element and a slight amount of hydrated halloysite as a subsidiary element. But the Ukai clay seems to contain monmorillonite in stead of hydrated halloysite. Impurities (silt and organic materials) are contained in large variations of amounts ; some of the clays contain large amount and others contain very little.
Monmorillonite is a main element of bentonite, but bentonite B contains considerable amount of silt and lowers the green compression strength of sand when it ts mixed to.
b. The difference of the sorts of main elements gives great influence on green compressive strength, but the influence of subsidiary element is quite little compared with that of silt.
Therefore, it is very important to anticipate the sorts of clay minerals and the quantities of silt when selecting foundry clays.抄録全体を表示PDF形式でダウンロード (704K) -
—実用粒度域における融着性について—原田 梅治, 西山 圭三1957 年 29 巻 12 号 p. 858-871
発行日: 1957/12/25
公開日: 2012/11/05
ジャーナル フリーWe investigated the refractoriness of 4 foundry silica sands which yield in Tokai district—Synthetic Silica Sand, Conical Silica Sand, Natural Silica Sand and Beach Sand—by shock-heating. The grain size of these silica sands investigated are each 35, 48, 65, 100 and 150 mesh only.
Inserting 50 gr silica sands into the temp. of 1500∼1550°C suddenly and keeping them in that state for 3 minutes, the refractoriness of them are measured. The gists of the experiments are as follows :
1. In refractoriness, Synthetic Silica Sand is most excellent, Conical Sand is next, Natural Sand is third and Beach Sand is fall behind.
2. The more excellent in refractoriness, the more the refractoriness of silica sand not to be influenced by its grain size, become greater.
3. By observing the states of the silica sand heated suddenly, we could investigate the tendency of the refractoriness of each silica sand at each grain size.
4. The tendency of the weight of fused silica sand at sudden heating has shown the same tendency of the decreasing percentage in weight and in specific gravity of the silica sand heated at high temp. and in SiO2 % content in silica sand, especially the decreasing percentage of sands heated at high temperature are quite similar.抄録全体を表示PDF形式でダウンロード (1770K)
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