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28 巻, 9 号
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研究論文
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—高炭素銑の処理組織—丸山 益輝1956 年 28 巻 9 号 p. 615-621
発行日: 1956/09/25
公開日: 2012/11/09
ジャーナル フリーChanges of graphite form in irons, which were electrolytically treated using the molten slag of CaO-SiO2-Al2O3 system as an electrolyte and the molten iron itself as a cathode, were studied. The original form of graphite in iron was coarsely flaky, but it changed into fine form by this treatment. Above all, by the electrolytic treatment with basic slag, kish graphite changed into spheroidal form. By the addition of a little amount of CaF2 into slag-even by the treatment with acid or neutral slag-excellent compact or spheroidal graphite was obtained. With the increase of silicon content in iron, graphite gradually got out of compact or spheroidal form. When inoculating the molten iron with Ca-Si, not only the compact or spheroidal graphite was obtained even in high silicon iron, but a part of eutectic graphite changed into spheroidal form.抄録全体を表示PDF形式でダウンロード (973K) -
中田 節治, 西村 修明, 藤田 泰1956 年 28 巻 9 号 p. 621-627
発行日: 1956/09/25
公開日: 2012/11/09
ジャーナル フリーThe authors studied the relation between the mechanical properties and ultra-sonic wave attenuations of various ductile cast irons, giving the same heat treatment by the use of a ultra-sonic flaw detector, in order to estimate the quality of works non-destructively.
The value of attenuation was measured by the numbers of multiple-echo n conveniently, at the constant sensivity of detector. Frequency available was only 5 MC/sec. The results obtained were as follows :
1) At a very large value of attenuation, graphite is flaky, consequently the mechanical properties are poor.
2) The specimen having an extremely small value of attenuation shows a tendency of high tensile strength but low elongation.
3) We can find the excellent mechanical properties from only the specimen having a moderate value of attenuation at the range of n from 10 to 28.抄録全体を表示PDF形式でダウンロード (1003K) -
前川 静彌, 鈴木 孝範1956 年 28 巻 9 号 p. 628-632
発行日: 1956/09/25
公開日: 2012/11/09
ジャーナル フリーThe object of this study is to find out the segregation of Si, Mn, Cu, Mg, etc. which are contained in cast iron, pig iron or noduler cast iron. The detection of the segregation of such elements is made on the transverse section of the round or wedge shaped specimen of those irons by means of a Carl Zeiss Qu 24 type quality spectrograph. And this is done under a certain measuring condition and by the usc of a fixed line pairs of quantitative spectrographic analysis.
Either pure zink or silver was used for a counter electrode when we made the local spectrographic analysis.
The results we obtained are summarized as follows :
(1) The structure of cast iron changes as the solidifying rate changes, and it also has an influence upon the luminecent source, and shows the result as it were the segregation of the specimen.
(2) The structure brings about a great change to the analysis values of Si in inverse proportion to the solidifying rate, showing “inverse V or W” type segregation curve.
(3) It seems that Mn, Cu and Mg containing in pig iron or cast iron will be given a little influence by the structure, though they are not so clear as Si. Therefore, it is suggested that the spectroscopic analysis of pig iron or cast iron should be done after distinguishing the structure of each sample.
(4) It should be noted that some local segregations are found on the parts of inclusions or shrinkage cavities.抄録全体を表示PDF形式でダウンロード (635K) -
—砂型および金型の熱吸収性について—椙山 正孝, 高橋 守雄, 新山 英輔1956 年 28 巻 9 号 p. 633-640
発行日: 1956/09/25
公開日: 2012/11/09
ジャーナル フリーHeat absorbing characteristics of sand and permanent molds ware quantitatively observed by the temperature measuring method and the relations between heat absorbing characteristics and soiidification mechanism of castings were discussed. Results obtained are as follows :
1) Heat absorbing curves described on this paper may be useful to express effectively heat absorbing characteristics of various types of molds. Using these curves, solidification time and cooling rate can be calculated and also suitable section of permanent maids or chill blocks can be suggested.
2) Heat absorbing curve of a given mold, is practically constant and is not almost affected by the casting conditions such as the section of casting, pouring temperature or moisture of the sand mold.
3) Difference of heat absorbing properties between the green sand mold and the dried one was only observed in the case of the light sectioned casting.
4) Heat absorbing ability of the metal mold depended upon its heat capacity at the initial stage and surface heat radiation at the later stage, the former was determined by the mold section and the latter agrceded with the value which is calculated from the Stefan-Boltzman's equation.
5) The solidification time of the metal mold castings remarkably varied when the value of the thermal capacity ratio of the metal mold to the castings reached to about unity.抄録全体を表示PDF形式でダウンロード (929K)
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