巻号一覧
1954 巻 (1954)
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1954 巻, 13 号
選択された号の論文の17件中1～17を表示しています
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池野 尚志1954 年 1954 巻 13 号 p. 3-19
発行日: 1954/11/10
公開日: 2008/10/30
ジャーナル フリー(1) The Casting
The effect of Fe, Si, Cu or Mn upon casting cracks of aluminium ingots were investigated by measuring shrinkages or cracks which were found in casting into a particular metal mould (See Fig. (2)). Results obtained are as follows: There is a relationship of casting and mould temperature within a limited range which favors prevention of cracking, varying according to the kind and the content of the impurities. The higher the casting temperature, the larger the shrinkage, and so the casting at higher temperature promotes the opportunity for cracks. Cracks which were found in such cases as hindrance of free contraction, become finer by slow cooling but larger by the rapid cooling, and also the higher the purity of Al, the finer they become generally.
In this experiment, the cause of cracking was assumed, in a general way, to lie in the stress due to the disparity of the solidification range of the alloy, but in practical operation, the tendency to cracking is to a marked degree affected by other factors for example, the casting technique.
(2) On the Developement of the Faults in the Slab Ingots.
The relation between casting techniques and cracks appearing in aluminium ingots has been studied with a practical tilting mould. These experiments were made for the purpose to find and prevent the developement of faults in aluminium ingots. The faults of the ingots were examined by means of specific gravity and hardness tests or microscopic examinations, and also the change of temperature inclination in the course of pouring.
The pouring temperature and the temperature of moulds affect seriously the cracks. The rate of casting, the shape of the runner, the degree of tilting the mould, etc. also influence the cracking. Among these, it was found: when the pouring temperature is high the temperature gradient along the vertical direction becomes large, and the gradient in the neighbourhood of the gate becomes much larger than in the opposite portion, and in such a condition, cracking appears mainly on the gate side.
From change of the thickness of slabs, the following formula was introduced:
Hy=(2Ha+ql2)/2lx-q/2x2
On the other hand, the developement of faults were identified by calculating the ratio of q to H, where the former is the force by which the slab tends to contract to the inner direction and the latter is that by which it tends to maintain the original form (See Fig. 50)抄録全体を表示PDF形式でダウンロード (3100K) -
(第3報)ミクロ組織川島 浪夫, 中村 雄造1954 年 1954 巻 13 号 p. 20-26
発行日: 1954/11/10
公開日: 2008/10/30
ジャーナル フリーIn the previous works, it was found that there was a macroscopical black zone, which seems a segregation zone, below the surface of 99.9% and 99.0%Al Sheet ingots made by continuous-casting process.
In this paper the authors investigated the microstructure to make clear the correlation between the macroscopical black zone, segregation zone, peridic exuded zone and periodic uneveness of the ingot surface, and the following results were obtained.
(I) High-Purity Aluminium.
1. The net-work structure by segregation was clearly found within the depth of 10mm bellow the surface of 99.9%Al Sheet ingot which corresponds to the black zone, the thickness of the segregation zone being 4-5mm, and the high content of Iron being in this zone.
2. If the peak of this way zone exuded from the ingot surface, anexudation phenomena shall happen to occur, but in the case of 99.9%Al this zone conceals oneself below the ingot surface.
3. After the soaking treatment, this segregation could not be disappeared.
(II) Commercial pure aluminium.
1. The segregation zone of the commercial pure aluminium sheet ingot is less clear than 99.9%Al. This zone of 99.7%Al ingot has the maximum content of iron corresponding to black zone.
2. Concerning the 99.5%Al sheet ingot, the periodic uneveness of surface by casting contraction is hardly found, but the remarkable exudation zone is found periodically.
3. The 99.5%Al sheet ingot made by the chill casting process has neither segregation zone nor black zone, but has grain boundary cavities and blow-holes at the centre of ingot, and the iron content is inhomogeneous at the various depth below surface.抄録全体を表示PDF形式でダウンロード (1678K) -
1954 年 1954 巻 13 号 p. 26
発行日: 1954年
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (160K) -
池野 尚志, 夏野 美輝雄1954 年 1954 巻 13 号 p. 27-30
発行日: 1954/11/10
公開日: 2008/10/30
ジャーナル フリーIn order to obtain industrially so sheets as possesing suitable properties to following workings by annealing after cold rolling, the change of mechanical properties of cold rolled 2S sheets was measured after heating at several conditions.抄録全体を表示PDF形式でダウンロード (510K) -
石田 四郎, Hiroshi NAKAMURA1954 年 1954 巻 13 号 p. 31-40
発行日: 1954/11/10
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (728K) -
中山 孝廉, 大鷹 浩介, 税所 裕1954 年 1954 巻 13 号 p. 41-43
発行日: 1954/11/10
公開日: 2008/10/30
ジャーナル フリーWhen aluminium is given on electropolishing it possesses such a reflectivity as of more than 96%, its reflectivity however, depends not only upon the composition of material but also the ingot production process greatly.
Therefore, we used 99.996% aluminum ingot made by Hoopes process and 99.8% ingot by Hall & Héroult process, and added intentinally such impurities as Fe & Si, then has prepared slabs under the same method, it being cold rolled to the thickness of 1m/m sheet. Then, under the same treatment condition the electropolishing have been given on the test pieces and the reflectivity was measured, and examined as to the relation between the reflectivity and the ternary system Al-Si-Fe diagram.
From results of this testing, the following points have been explained;-
(1) Si up to 0.2% does decrease the reflection appreciably, but more than that it decreases rapidly. This indicates that there presents of Si solid solution.
(2) Fe deteriorates the reflectivity, even if it contains only 0.1%. This indicates that there exists practically no solid solution of Al-Fe.
(3) If Si is increased to more than 0.4-0.5%, the effect of Fe increases rapidly. This may be due to a new compound produced.
(4) In order to prevent the effect of Si, iron content should be avoided. In this test there appeared no difference of production between Hall & Hèroult process ingot and and Hoopes process ingot, and this remains as a problem to be investigated later.抄録全体を表示PDF形式でダウンロード (295K) -
脱ガス処理効果と添加元素の影響塩田 信雄1954 年 1954 巻 13 号 p. 44-54
発行日: 1954/11/10
公開日: 2008/10/30
ジャーナル フリーThe continious mesurement for the difference of gas content or composition into aluminium is possible by the electrical method utilized the change of thermal conductivity. Above all, the thermister gas analytical method which was adopted by the author's idea is more effective one than any other method as reported to the present time.
The experimental results obtained are summarized as follows;
a) Although the effect of degassification by remelting of chlorine or nitrogen gas treatment, it is effective considerablly for the molten aluminium including a small amount of gas.
b) During the time of degasing treatment, nitrogen is absorped into molten aluminium for a long time.
c) The amount of occluded gas into Al and its alloys is not always decreased by the addition of Si, Cu. Especially the amount of extracted gas from its alloys in solid solution or eutectic composition increases than that of Al.
d) The additional effect of iron in Al is not recognized in the range of practical alloys. It is apt to increase the shrinkage cavity rather than gas content in casting materials.
In the last chatper, he calculates the quantity of heat by the dissolved gas into molten Al and the activation energy of degassification from Al and its alloys by the various treatments. From the above calculaton, the more heat of dissolution increases the more gas absorption decreases but once it absorbed hydrogen gas, degassification process from molten Al becomes more difficult on the contrary. The writer induced the following formula about the degassification process.
Ax=C×A0/x
A0 is the activation energy of non-treatment sample in Al, x is the decreament ratio of extracted gas by the various treatments of degassification and C is a constant.
From the experimental results, it is recognized that the degassification process is completed with the activation energy having 45, 000cal/mol in remelting method and 30, 000cal/mol in chlorination or nitrogen treatment.抄録全体を表示PDF形式でダウンロード (1500K) -
“圧延板の加熱温度の影響”潮田 豊治, 吉村 修, 増山 章一郎1954 年 1954 巻 13 号 p. 55-61
発行日: 1954/11/10
公開日: 2008/10/30
ジャーナル フリーThe authors studied the influence of heating temperature on 99.97%Al, 99.8%Al 99.5%Al, 99.0% Al (main impurities Fe and Si) and 1%Mg-Al Alloy sheets of the same gas content. In this report, gas grade 3 and 7 according to the measuring method shown in this paper part 2 were studied. The relation between heating temperature and the blister of the sheets which was hot rolled with or without slab soaking were also described.抄録全体を表示PDF形式でダウンロード (744K) -
(第2報)“皮疵との関係”伊藤 光1954 年 1954 巻 13 号 p. 62-66,61
発行日: 1954/11/10
公開日: 2008/10/30
ジャーナル フリーIn part 1, I reported that metallic silicon is one of the main causes of blister and in this part 2 I wish to express the results of the experiment by which it is cleared that "Kawakizu" is also influenced by Silicon as well as blisters.
"Kawakizu" is considered to be influenced by Silica involved, in other words it is caused by the powder of fire bricks in furnace and also mud attached to the raw materials, while blisters are caused by metallic Silicon.
It is known that there is something related between blister and "Kawakizu" by the experiment. I remelted aluminium sheets which contains comparatively many "Kawakizu" and removed its slag as much as possible.
The sheets produced through such process contain more blisters comparing with the original sheets.
It is considered that a part of Silica mixed in is reduced by aluminium in the remelting, and free metallic Silicon increases and consequently blisters increase on the sheets of remelting in comparison with the original sheets as stated previously.
It is concluded that Silicon has influence on both "Kawakizu" and blister, according to the state of Silicon existed, causes "Kawakizu" or blister, that is to say, the former is caused by Silica which is mixed in and the latter by free metallic Silicon.
This is to report the result of the experiment on the above subject.抄録全体を表示PDF形式でダウンロード (796K) -
潮田 豊治, 吉村 修, 伊藤 光, 原口 優1954 年 1954 巻 13 号 p. 67-70
発行日: 1954/11/10
公開日: 2008/10/30
ジャーナル フリーAluminum kitchen wares are generally sold with protective surface film, namely anodic oxidation film on them, but sometimes as special products they are sold after only washed with caustic soda and polished, baring white colour of the material. When these wares without protective films on them are actually used the colour turns to black and give us feeling as if they were not clean.
In order to find out, as to this black substance, what conditions cause the discoloration and what it consists of, we took up 99.96% Aluminum, 2S, 3S, 52S, 56S and 61S as materials for experiments, in which we studied about the influence of the purity of Aluminum, heat treatment and the character of water to find the conditions of dis-coloration, secondly we researched for the causes of the discolosion by chemically analysing this black substance and further by dropping various reagents into distilled water.
This is the report of the above experiments.抄録全体を表示PDF形式でダウンロード (840K) -
三島 良績1954 年 1954 巻 13 号 p. 71-76
発行日: 1954/11/10
公開日: 2008/10/30
ジャーナル フリーEffect of quenching condition upon the age-hardenability of Duralumin type alloys have been discussed here from three points of view; 1) the time and temperature of solution treatment, 2) the effect of lag between solution treatment and quenching and 3) temperature and specification of the quenching medium. Among these, the effect of the time of solution treatment on ageing characteristics of Al-3.9% Cu alloy has been further investigated and several experiments have been carried out to examine how age-hardenability depends upon three factors mentioned below, respectively; 1) degree of completion of disolution during solution treatment, 2) degree of grain growth during prolonged soaking and 3) amount of quenching strain. Satisfiable explanation of the experimental results could be made, when the third factor; i. e. quenching stress was thought to be predominant, solong as soaking time should be limited to the least necessary duration to bring the alloy completely into a single alpha phase and quenching should be carried out as quickly as possible.
Age-hardening was found to be accelerated when the alloy was quenched from the higher temperature, but no appereciable gain seemed to be obtained in the final strength when ageing saturated.
Quenching conditions at the factories were discussed in conclusion based on the informations hereto- fore obtained.抄録全体を表示PDF形式でダウンロード (1124K) -
小林 藤次郎, 坂上 健司1954 年 1954 巻 13 号 p. 77-81,70
発行日: 1954/11/10
公開日: 2008/10/30
ジャーナル フリーBecause of our lacking in any pefinite. materials regarding the Bend Radii of 17S-O Alloy Sheets, we tried the bending test on the Sheets-0.4-1.0, 2.0, 4.4, and 6.0mm thick, respectively.
The materials were annealed at 300°-450°C for an hour and furnace cooled and air cooled.
We carefully compared the test results with JIS, (Proposed Spec.) coming to the conclusion that Furnace Cooliing after Annealing to 350°-400°C is necessary in order to get a good workability.抄録全体を表示PDF形式でダウンロード (675K) -
森永 卓一, 呂 戊辰1954 年 1954 巻 13 号 p. 82-86
発行日: 1954/11/10
公開日: 2008/10/30
ジャーナル フリーThis study is chiefly lay stress upon practicably.
That is, various examination is treated with several production of Al and Al-alloy about to get off the grease and etching, intermediate layer, plating etc.
It is found that the neutral dip-sol is best condition as the solution of getting off the grease.
The electrolysis of cathode is carried on with the condition of 12 volt and 60C, the etching solution is the component of 25% manganese chloride 10% hydrochloric acid, the rest is water.
After the etching, deposited oxide is removed by acqur regis and with chemical substitution the oxided film is removed in the solution of zinc cyanic. Next to the cleaning, the deposited zinc is removed by 5% hydrochloric acid.
The two intermediate layer, which is zinc plated in the solution of alkaline the other is applied nickel plate, has been tested about the other is applied nickel plate, has been tested about the comparison of adhesion. The resolt of both is very excellent. According to this method, the Cu plated intermediatelayer, which is impede of the anticorrosive effect, is possible to expel. And in the case of the zinc intermediate layer, the temperature of nickel solution must not raise higher; and it is found that if possible the strike of nickel plate is set up into other tank is better.抄録全体を表示PDF形式でダウンロード (791K) -
石田 四郎, 中村 熈, 麻田 宏, 新井 三郎1954 年 1954 巻 13 号 p. 87-89
発行日: 1954/11/10
公開日: 2008/10/30
ジャーナル フリーTo-gether with well-known corrosion-resisting aluminium alloys such as 2S, 3S and 52S, a new corrosion-resisting one 54S are investigated.
2S and 3S are produced by Northern Aluminium Co. and 52S and 54S are by Alcoa. As the samples investigated were all too small for full investigation, determination of impurity content such as iron, copper, silicon etc. corrosion-testing by means of Mylius method and tensile testing were carried out.
As the result of investigation, it is found that lower limit of inpurities are kept to ensure good corrosion-resisting properties.抄録全体を表示PDF形式でダウンロード (464K) -
1954 年 1954 巻 13 号 p. 89
発行日: 1954年
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (117K) -
大沢 秀寿1954 年 1954 巻 13 号 p. 90-101
発行日: 1954/11/10
公開日: 2008/10/30
ジャーナル フリーDescription is given of the properties of aluminium foil as well as of its present use for packaging, insulation, decoration and capacitor with some examples.
With our increasing knowledge of the properties of aluminium foil the use of aluminium foil has been greatly accelerated, and the improvement of laboratorial methods and manufacturing technique concerning embossing, printing and lacquering has made new applications possible.
With the downward trend in prices and increasing interests of customers aluminium foil seems to to have the bright future finding new fields for more applications.抄録全体を表示PDF形式でダウンロード (3727K) -
1954 年 1954 巻 13 号 p. 102-125
発行日: 1954/11/10
公開日: 2014/02/24
ジャーナル フリーPDF形式でダウンロード (5452K)
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