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36 巻, 6 号
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研究論文
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宮川 嘉人, 阿南 秀則1964 年 36 巻 6 号 p. 533-544
発行日: 1964/06/25
公開日: 2012/10/15
ジャーナル フリーIn the comparison of oxygen blowing and ore process in steel melting, the decurburizing velocity is big and less content of non-metallic inclusion in the former process.
This is because of the effect of pure oxygen and its active bubbling action in the process.
Therefore, the author tried to know the change of carbon and gas content with different blowing velocity and time.
The results obtained are as follows.
(1) In case of small ratio of blowing velocity to time for same oxygen quantity, the degree of decarburization and oxygen content are bigger than when the ratio is big. The decrease of nitrogen and oxygen showed maximum at the ratio of 8.
(2) At the oxygen blowing ratio of 8 above mentioned, the quantity of increased oxygen is comparatively less while the decarburization is rather remarkable.
(3) The decrease of nitorogen and hydrogen content is much influenced by the velocity of oxygen blowing.
(4) The empirical formula between carbon and oxygen in steel bath during oxidizing period is obtained as follows.
0(p.p.m.)= 30⁄C(%) +100抄録全体を表示PDF形式でダウンロード (984K) -
岡本 平, 茨木 正雄1964 年 36 巻 6 号 p. 544-551
発行日: 1964/06/25
公開日: 2012/10/15
ジャーナル フリーA study was made to make clear the effect of slag basisity on the structure of cast iron melted in a graphite crucible. The slags used were composed of CaO-SiO2-Al2O3 system containing 10 −20% of Al2O3, and added CaF2 and MgO in some basic slags. The irons used were a pig iron and alloys made from electrolytic iron, electrode graphite, metallic silicon and sulphur.
The results obtained are as follows:
(1) The slags added CaF2 change remarkably the value of R〔=(NCaO+2/3 NMgO) / (NSiO2+NAl2O3)〕 due to decomposition of CaF2 in contact with molton iron.
(2) The powder of CaO or MgO with which molton iron makes in contact has the same effect as the basic slag with 1.5 −2.0 or 1.0 −1.5 of R, respectively.
(3) The amounts of FeO in slag, silicon and sulphur in iron decrease with increasing R of slag.
(4) The structure of cast iron treated under higher basicity of slag contains more amounts of eutectic graphite and ferrite. The change in the structure of high carbon cast iron is related to the change of sulphur content.抄録全体を表示PDF形式でダウンロード (897K) -
—凝固収縮量について—矢作 恭蔵1964 年 36 巻 6 号 p. 551-560
発行日: 1964/06/25
公開日: 2012/10/15
ジャーナル フリーThe reports on the shrinkage defects of gray cast iron would provide the foundrymen with some solutions for the casting defects.
In this report, the shrinkage volume of gray cast iron during solidification was measured. The measured figures show not only the shrinkage volume in solidification, but also the volume of outer-shrinkage defects which are supposed to appear in casting without feeding.
The results are the volume and temperature changes during cooling of cast iron, and the volume changes depending on the carbon-equivalent.抄録全体を表示PDF形式でダウンロード (1080K) -
竹内 栄一1964 年 36 巻 6 号 p. 561-569
発行日: 1964/06/25
公開日: 2012/10/15
ジャーナル フリーSo many works have been done on the slidingwear of cast iron, but still left a few questionable points.
In this work, the sliding surface and the powders produced during wear process were observed and from the observation, the mechanism of dry sliding wear of cast iron was examined. And further, the relation between wear mechanism and reproducibility of wear loss amount or volume was studied.
Results are summarized as follows.
(1) In the oxidation wear range, conventionally called, plastic deformation due to frictional force is observed on the sliding surface. It is named that the layer of plastic displacement and of plastic flow.
(2) In the range of mechanical wear, wear develops by breaking out from the crack propagating from the both end of graphite flake to adjacent graphite or to the surface.
(3) In the range of adhesion wear, conventionally called, wear develops by breaking out from the cracks on the sliding surface which are the results of thermal stress generated by frictional heat. It is named the high temperature destruction wear.
(4) Study is done within the range of preferable reproducibility in wear loss. In the lighter load and slower velocity range than oxidation wear limit, as slide distance increases, wear mechanism changes from oxidation type to mechanical one, but mechanical wear does not change with increase of slide distance.抄録全体を表示PDF形式でダウンロード (1270K) -
石野 亨, 塩田 俊雄1964 年 36 巻 6 号 p. 570-579
発行日: 1964/06/25
公開日: 2012/10/15
ジャーナル フリーIt is well known that mechanical properties of cast iron are influenced by deposition, distribution and shape of graphite. Then, in order to we know how graphite influences for fracture of cast iron, tension, transverse (bending) and impact were loaded in commercial cast irons with various shapes and distributions of graphite, and observed the fracturing process.
In the flake and eutectic graphite cast irons, the fractures started first from flake and eutectic graphite and it proceeded along graphites in any case tension, transverse and impact loading. In the ductile and malleable cast irons, however, crack in graphite and slip lines of the matrix were observed first, with increased loading, under tensile loading the deformation of the matrix occurs relatively uniform, and under transverse loading it occurs in a very wide regions. We can't think, therefore, that fracture starts and developes always from spheroidal and noduler graphite. It is also found that spheroidal and noduler graphite tend to radiate crack in impact loading.抄録全体を表示PDF形式でダウンロード (1159K)
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