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37 巻, 11 号
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研究論文
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椙山 正孝, 佐藤 純一1965 年 37 巻 11 号 p. 967-973
発行日: 1965/11/25
公開日: 2012/10/11
ジャーナル フリーIn this paper we investigated the refinig effects of phosphorous additives to Al-20Si alloy melt changing melting temperature and holding time. Also we examined them by the direct addition of AlP considered to be a crystallizing nucleus of primary silicon. These experiments were based upon the measurement of the grain size of primary silicon, but at the same time we observed the cast structure in each case.
As an important result it has been made clear that the effect of phosphorous addition could be obtained only above the temperature of 850°C in case of red phosphorous, and above 800°C in the case of the other additives. We have also found that at the keeping time of 750°C a characteristic curve of each additives could be obtained and that each curve approached to nearly the same value of grain size. Using these results we have done some discussion of the behavior of refining nuclei of primary silicon crystals.抄録全体を表示PDF形式でダウンロード (941K) -
本間 正雄, 目黒 博, 湊 昭, 阿部 善彦1965 年 37 巻 11 号 p. 974-981
発行日: 1965/11/25
公開日: 2012/10/11
ジャーナル フリーWe studied on the manufacturing of vanadium high grade cast iron, in which we used the raw iron materials of blast pig iron, pig iron made of vanadium contained iron sand, steel scrap, Fe-V and vanadium contained oxidized slag.
Then compared with plain high grade cast iron, we clarified the mechanical properties of this cast iron.
It is much better to add in furnace, than in ladle, to add vanadium to cast iron by Fe-V alloy.
The addition of vanadium by oxidized slag containing vanadium is almost completely alloyed.
High carbon cast iron of about 3.4% carbon has tensile strength of about 35 kg/mm2, if it contained 0.5∼0.7% vanadium.抄録全体を表示PDF形式でダウンロード (673K) -
真鍋 健太郎, 喜多 章1965 年 37 巻 11 号 p. 981-985
発行日: 1965/11/25
公開日: 2012/10/11
ジャーナル フリーIn this report, authors researched changs of compositions and characteristics of molten cast iron treated with yttrium, holding at high temperature, and also investigated effects of remelting as J.J. Kanter and his collaborator described.
Several kinds of Fe-C-Si alloys were prepared as base alloy and after melting of each alloys added yttrium and imoculated by ferro-silicon. Test speecimens were castfrom these molten metal at reguler interval, keeping the required temperature. Authors tested to clarify the relation among gas content, cooling curve, chemical constituent and formed graphite characteristic.
Following results were obtained :
(1) Oxygen content increased a little by addition of yttrium and inoculation by addition of yttrium and inoculation, by ferro-silicon, nevertheless the graphite form changed from flake to spheroid.
(2) The residual content of yttrium and the extent of super cooling decreased according to the holding duration in molten state in spite of oxygen and sulpher content in original sample alloys, and the graphite form changed into quasiflake-euteeticflake from spheroid, therefore the graphite from is influenced by the residual content of yttrium and the extent of super cooling.
(3) Incase of comparatively rapid remelting at low temperature, using the electric furnace, the spheroidal graphite will be reappeared, but it will be imposible to produce the spheroidal graphite cast iron fron the cupola melt because of the increase of sulpher content.抄録全体を表示PDF形式でダウンロード (731K) -
草川 隆次, 渡辺 靖夫1965 年 37 巻 11 号 p. 987-994
発行日: 1965/11/25
公開日: 2012/10/11
ジャーナル フリーThe effects of the addition of cerium on the macro and microstructure of cast iron have been investigated.
The results were as follows.
(1) Added on the surface of molten iron, cerium reacts with oxygen so actively that cerium forms oxide and is lost without any suitable flux or coating.
(2) The microstructures of cast iron added cerium showed, in turn from surface to bottom, unknown high cerium content ctructure, chilled structure and flake or eutectic graphite structure.
The unknown structure consisted of Fe-Ce compound, cerium oxide and cerium sulfide.
Cerium was remained in the chilled structure, but in the graphitized structure, cerium could not be detected at all.
(3) With the aid of electron probe X-ray micro-analyser, it was cleared that cerium did not exist in cementite but on the boundary between cementite and austenite.
(4) Silicon was detected in the same place that had high cerium concentration in the chilled structure.抄録全体を表示PDF形式でダウンロード (876K)
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