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34 巻, 1 号
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研究論文
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落合 三雄, 表野 明1962 年 34 巻 1 号 p. 13-21
発行日: 1962/01/25
公開日: 2013/03/05
ジャーナル フリーMechanical properties of the tubular steel casted centrifugally were improved by annealing according to their rotating speed, in the case the castings have thickness of 20～30mm and the speed of 1100～1600r. p. m.
Then the microscopic structures were investigated in relation to the size of wall thicknesses of the castings and the rotating speed. The results were summarized as follows :
1. The more increase the rotating speed, the more inproved the mechanical properties by refining the grains of ferrite and austenite.
But, this refining action is not only by its centrifugal force but partially it is attributed to its rapid cooling.
2. Segregation of carbon in plain carbon steel casting would hardly affect to the mechanical properties, but segregation of copper will give great influence on them when the steel contains some copper.
3. As the thickness of the castings is increased or the rotating speed is increased, non-metalic inclusions will gather more easily on inner surfaces and the mechanical properties of the castings will be improved, but their quantitative relations are not made clear.抄録全体を表示PDF形式でダウンロード (1396K) -
鈴木 和郎, 山岡 弘1962 年 34 巻 1 号 p. 22-27
発行日: 1962/01/25
公開日: 2013/03/05
ジャーナル フリーAs a result of the present study, it was obvious that, when metal was cast into a mould of a good permeability, the portion of pressure functioning as the back pressure on the contacting surface of the mould, including a partial pressure of the gas being emanated inside the it was of an unexpectedly low value, and, also, that, in the cases of a green sand mould containing 4% of moisture, the maximum back pressure on the surface was only to such an extent that 25～30mm water column is formed. However, in these moulds of such a low back pressure, still the blow holes were observed to be formed.
On the basis of this finding, a conparetive study was conducted referred to the changes of the gravity pressure and back pressure on the mould surface, depend on the rising surface of the molten metal on casting.
As a result of the study, it was quite clear that it is inadequate to discuss the formation of blow holes simply in relation to the maximum back pressure on the surface.
In other words it was found that the conventional idea on the formation of blow holes will be applicable to rather exceptional cases and that furthe study will be required before mechanical designers cease from blaming the unreliable castings.抄録全体を表示PDF形式でダウンロード (390K) -
鹿島 次郎, 山崎 卓雄1962 年 34 巻 1 号 p. 28-31
発行日: 1962/01/25
公開日: 2013/03/05
ジャーナル フリーThe hydrogen pick-up in a molten cast iron, from the sand moulds was studied by spiral mould method, and the hydrogen content in several positions have determined with the method of the inert gas fusion-gaschromatography.
The experimental results are shown in the following ; (1). The hydrogen in the gray cast iron held over about 6 minutes in the CO2-process mould was increased on the whole of 2-3 times against chill mould bar. (2). In the white cast iron cooled quickly in air the rate of qick-up hydrogen in spiral sample was shown so small, such as the increase of 20-30% in the sand moulds against chill mould. (3). In the white cast iron, the rate of pick-up hydrogen from the sand moulds have concern with the moisture content in the mould ; it was in the order of green sand mould>CO2-process mould>dry sand mould. (4). In the spiral samples cast in shell mould, the hydrogen was remarkably segregated.抄録全体を表示PDF形式でダウンロード (205K) -
－耐生長性－津田 昌利, 富田 昭津, 中川 三三1962 年 34 巻 1 号 p. 31-39
発行日: 1962/01/25
公開日: 2013/03/05
ジャーナル フリーThe properties of heat-resistance are the most important properties of gray iron castings using in air at high temperature. It seems that the S-H cast iron developing the structures refined extremely by titanium is provided for a advantage of growth-resistance.
The authers investigated to confirm the degrees of growth-resistance of cast irons such as S-H cast iron, nodular graphite cast iron, coarse flake graphite cast iron, common grade gray cast iron, special pearlitic cast iron and others. The growth values offered are measured by using a dilatometer and certified by microscopical observation and others.
The results obtained are as follows.
(1) Provided that the heating and cooling are repeated continuously six times between 600°C and 900°C at 7°C/mn, the average values for the rate of growth are as follows ; coarse flake graphite cast iron; 1.46%, common grade gray cast iron ; 1.12%, S-H cast iron ; 0.76%, special pearlitic cast iron ; 0.55%, nodular graphite cast iron ; 0.44%.
(2) Providad that tha heating at 7°C/mn the holding at 900°C for 5 hours and then the cooling at 7°C/mn are proceeded according to such orders, the average values are as follows : coarse flake graphite cast iron ; 1.56%, common grade gray cast iron ; 1.08%, S-H cast iron ; 0.45%, special pearlitic cast iron ; 0.38%.
(3) The thickness of decarburized layer consists of ferrite, may be developed roughly accordind to such values of growth.
(4) For S-H cast iron developing the structure refined extremely such as beforementioned increases the degrees of resistance aganist internal oxidation it can be noted that S-H cast iron takes almost the same growth degrees as special pearlitic cast iron and nodular graphite cast iron.抄録全体を表示PDF形式でダウンロード (569K)
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