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40 巻, 11 号
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研究論文
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喜多 清1968 年 40 巻 11 号 p. 859-866
発行日: 1968/11/25
公開日: 2012/10/04
ジャーナル フリーA comparison of the strength of low manganese spheroidal cast iron was made between actual castings and Y-block test pieces. Castings used for this were those of valve, box and frame. As a result of the measurememts, it was known that there were few differences in strength between actual castings and test pieces while there was a large difference in elongation between them. That is, the elongation of actual castings was only 8 to 52% of that of y-block, while the strength of the former was 83 to 116% of that of the latter. The hardness of actual castings was 110 to 125% of that of Y-block. This difference was caused by the change in the ratio of ferrite to pearlite, which took place more remarkably in case of low manganese case iron. Destructive test well proved that its result coincided with said experimental result.抄録全体を表示PDF形式でダウンロード (1164K) -
大出 卓, 大平 五郎, 井川 克也1968 年 40 巻 11 号 p. 866-876
発行日: 1968/11/25
公開日: 2012/10/04
ジャーナル フリーAlthough a number of reports were published on the graphitization of cast iron, there have been carried out few studies to clarify the relation between graphitization and ledeburite structure of cast iron in pure iron-carbon-silicon alloy. Cast iron used for the present experiment was made by melting electrolytic iron, electrode graphite and metallic silicon in an induction furnace and cast into an exothermic mold, green sand mold or metallic mold. Cast specimens of varying chemical composition were annealed in vacuum at a constant temperature. The first stage graphitization was measured by using a displacement measuring apparatus. The experimental result was:
1) In the case of pure Fe-C-Si alloy the time of graphitization, linear expansiton caused due to graphitization and graphite structure changed with the change of ledeburite structure of white cast iron.
2) The time of graphitization was decreased more remarkably by increasing silicon content than by increasing carbon content.
3) The degree of linear expansion caused due to graphitization depended extensively on the form, size and distribution of temper carbon.
4) The form, size and distribution of temper carbon were remarkably influenced by the condition of ledeburite structure of white cast iron.抄録全体を表示PDF形式でダウンロード (1346K) -
佐藤 敬, 丸山 益輝, 音谷 登平1968 年 40 巻 11 号 p. 877-882
発行日: 1968/11/25
公開日: 2012/10/04
ジャーナル フリーThe segregation behaviour of silicon in cast irons treated with different alloys in molten state was studied on four heats which were melted in a magnesia lining high frequency induction furnace of 50 kg capacity under lime fluorspar slag. Silicon content was adjusted by adding ferrosilicon of ordinary grade beforet apping. Inoculation was made in a preheated ladle by adding refined ferrosilicon or a mixture of calcium silicide and magnesium fluoride. The melt was cast into a Y-block of 50mm wide. The test pieces were subjected to tensile test and metallographic examination.
Segregation of silicon was detected by potentiostatic etching in sodium hydroxide aqueous solution of 10 normal at 400 mV versus saturated calomel electrode and electron probe microanalysis. The results obtained were:
1) In case the melt was treated with large amount of refined ferrosilicon, there were observed regions in which silicon was highly concentrated. Spheroidal graphites were formed mostly in silicon segregated points.
2) Segregation of silicon took place less significantly in samples treated with the mixture of calcium silicide and magnesiun fluoride, when the amount of silicon introduced into melt was smaller.
3) The primary structure could be distinguished from ferritic matrix of large casting by applying the potentiostatic etdhing teching technique. In case of hypereutectic spheroidal graphite cast iron dendrite pattern could be clarified and in case of flaky graphite cast iron eutectic cells could be observed.
4) The segregation of silicon in matrix had few influences upon the tensile strength of cast iron.抄録全体を表示PDF形式でダウンロード (817K) -
吉村 浩, 栗原 豊, 土井 仁1968 年 40 巻 11 号 p. 883-888
発行日: 1968/11/25
公開日: 2012/10/04
ジャーナル フリーA statistical investigation was conducted to clarify the relations among the various factors influencing the condition of cupola operation. A water cooled hot blast cupola was operatd in basic condition with charging steel scrap and pig iron of uniformity. The operating condition was mantained constant during melting. The data of those factors were obtained by continuous measurement extending over 144 minutes during each operation.
As a result of the process analysis both CO2 content and tapping temperature were recognized as an informatIon factor, and further the temperature of hot blast as a controlling factor.抄録全体を表示PDF形式でダウンロード (648K)
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