巻号一覧
16 巻 (1966)
- 6 号 p. 282-
- 5 号 p. 217-
- 4 号 p. 169-
- 3 号 p. 113-
- 2 号 p. 57-
- 1 号 p. 1-
16 巻, 6 号
選択された号の論文の7件中1～7を表示しています
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池村 恭一1966 年 16 巻 6 号 p. 282-283
発行日: 1966/11/30
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (307K) -
西川 精一, 長島 信雄, 沢口 哲夫1966 年 16 巻 6 号 p. 284-292
発行日: 1966/11/30
公開日: 2008/10/30
ジャーナル フリーTwo kinds of Al-0.3wt% Zr ingot were prepared; one of which was cast in permanent mould and the other in heat insulating brick mould. The recrystallization characteristics of the above alloy sheets produced from the above ingots were researched under several heat-treated conditions.
The main results obtained were as follows:
(1) Under the condition of practical operation, the most excellent heat resisting properties would be given by so-called supercooled solid solution produced from homogeneous liquid phase by rapid solidification. However, rather excellent properties were given even by slow solidification when subjected to suitable heat treatments.
(2) The effects of heat treatments on heat resisting properties were able to be divided into two temperature stages.
In recovery stage (at lower temperature), there was observed a kind of low temperature temper hardening, which probably resulted from the so-called "Cottrell pinning" of dislocation by Zr atoms. However; the reason of the above hardening is still ambiguous and shall be re-examined in more detail. In addition, competition between recovery and recrystallization must be taken into account, because it may effect retardation on the following recrystallization kinetics.
In recrystallization stage (at higher temperature), fine precipitates of Zr-rich phase appeared by prolonged ageing at suitable temperatures. These precipitates preferentially appeared at dislocations introduced by cold working. The age hardening and locking mechanism of dislocations may be very effective in improving high temperature properties of this alloy.
(3) In slowly solidified material, precipitation hardening was scarcely observed in as cast state. However, when it was solution heat treated at high temperature, fairly strong age hardening was restored.
(4) The age hardening responce of the alloy was usually very sluggish. Even being aged at 350°C, hardening began to take place at about 50hr. after the start, and the hardness attained to the maximum value at about several hundred hours later. In practical, it may be required to accelerate the action by cold working. The increment of hardness by ageing was about 10 VHN.抄録全体を表示PDF形式でダウンロード (2420K) -
橋浦 広吉, 小松 允1966 年 16 巻 6 号 p. 293-297
発行日: 1966/11/30
公開日: 2008/10/30
ジャーナル フリーThe present paper relates to the experiments on the determination of feeding characteristics of molten metals. The author devised a novel method for the above study and the experiments were performed on Al-Si alloys. The results obtained were as follows:
(1) The feeding volume ratio of the molten metal was inversely proportional to the tendency of producing shrinkage holes in castings.
(2) The feeding characteristics of pure aluminum and eutectic alloys was superior to that of other alloys having wide solidification range.抄録全体を表示PDF形式でダウンロード (548K) -
アルミニウム溶湯の脱ガス剤に関する研究 (第2報)山田 始, 北村 寿朗, 岩尾 修1966 年 16 巻 6 号 p. 298-303
発行日: 1966/11/30
公開日: 2008/10/30
ジャーナル フリーChlorine and fluorine are well known as effective degassing agents for aluminum and its alloys. Fluorine has usually been used as a flux of fluorides. However, being different from gaseous chlorine, fluorine cannot be used so effectively as the "direct bubbling" of chlorine into molten metals.
On the other hand, "Freon l2 (CCl2F2)" which is widely used as a refrigerant, contains both of chlorine and fluorine. Because of its odorless and non-poisonous properties, it is very simple in handling. Hence, it is very promissing of excellent degassing agent for aluminum and its alloys.
In this paper, the authors report the effectiveness of CCl2F2 and N2-CCl2F2 mixture for degassing agents as well as the harmfulness of the waste gas after the degassing treatment.
The results obtained were as follows:
(1) Degassing ability of CCl2F2 evaluated by the porosity of aluminum castings was nearly twice as large as that of Cl2. However, the waste gas after the treatment of CCl2F2 was more poisonous than that of Cl2.
(2) Degassing ability of N2-CCl2F2 mixture was greater than that of N2-Cl2 mixture. The degassing ability rapidly increased with the increase of CCl2F2 content up to 30% and the ability of N2 70%-CCl2F2 30% mixture was almost equal to that of 100% Cl2.
(3) N2-CCl2F2 mixture containing less than 50% of CCl2F2 was less poisonous than 100% Cl2. The former was less corrosive against mild steel or aluminum than the latter.
(4) By mixing CCl2F2 with Cl2, the degassing ability of the mixture increased in linear proportion with the increase of CCl2F2 content. The ability of N2-Cl2 mixture also increased by mixing CCl2F2 and it was equal to that of N2 70%-CCl2F2 30% when 20% of CCl2F2 was mixed with N2 90%-Cl2 10% mixture.抄録全体を表示PDF形式でダウンロード (898K) -
過共晶Al-Mn合金の研究 (第3報)市川 理衛, 大橋 照男1966 年 16 巻 6 号 p. 304-311
発行日: 1966/11/30
公開日: 2008/10/30
ジャーナル フリーCooling conditions for easily obtaining the network microstructure of primary crystallized supersaturated α-solid solution, which was observed only by rapid cooling from the molten bath, were researched on ternary Al-3-5% Mn base alloys. Mechanical properties of the alloys having such structure were also studied. The results obtained were as follows:
(1) Cooling velocity of more than 900°C/sec. between 800°C and m.p. was indispensable for obtaining such network structure on binary Al-3-4% Mn alloys, but the limit of the velocity was dropped to 250-300°C/sec. on Al-3% Mn alloys containing a suitable amount of Ag, Cu, Mg, Si, or Zn.
(2) The critical cooling velocity of the ternary alloys containing Fe, Ni, and Ti was almost the same as that of binary alloys.
(3) Favorable data of tensile strength and elongation were observed on ternary alloys having such structure.抄録全体を表示PDF形式でダウンロード (1142K) -
佐藤 四郎1966 年 16 巻 6 号 p. 312-317
発行日: 1966/11/30
公開日: 2008/10/30
ジャーナル フリーCut-off turning tests were conducted on aluminum round bar of 40mm in dia. under the following conditions; the number of revolution of the lathe was in the range of 500-1, 000r.p.m., the feed was in 0.06-0.16mm/rev., and the principal component of cutting oil used was kerosene or mineral oil. The cutting tool was made of high speed steel (SKH4) having rake angle of 26°; clearance angle of 6°, and cutting edge of 4mm.
The main results obtained were as follows.
(1) Between the both cases of using kerosene and mineral oil as cutting oils, a clear difference was observed in the relation between the tangential force and cutting depth of the tool. When mineral oil was used, tangential force gradually increased with the increase of cutting depth; while, in the case of kerosene, the increase of tangential force was much greater as compared with the former case, and the value showed a maximum in the middle point of the radius of round bar, and subsequently, decreased violently.
(2) The tangential force was independent of cutting speed, but increased linearly with the advance of feed.
(3) The thickness of chips was not uniform even when the turning was under constant feed; but it increased with the increase of cutting depth. The value showed a maximum at the cutting depth giving the maximum tangential force.
(4) The chips tended to scratch the sides of neck, resulting the ruin of finished article. Then, the width of chips became smaller than that of tool. These tendencies were more remarkable when the feed was advanced, and were more remarkable in using kerosene than mineral oil.抄録全体を表示PDF形式でダウンロード (803K) -
五弓 勇雄, 斎藤 好弘1966 年 16 巻 6 号 p. 318-323
発行日: 1966/11/30
公開日: 2008/10/30
ジャーナル フリーThe process of producing E. C. Aluminum round wires from slitted strip by using universal rolling mill with grooved rolls has been developed in America. The authors devised to use roller dies instead of the rolling mill for the purpose of producing the same wires from the slitted strip and succeeded in trial. It was found that more merits were observed in the drawing process with roller dies than in the rolling process. Furthermore, mechanics of drawing with roller dies, was checked by measuring the drawing force. The results obtained were as follows:
(1) By using the combination of lip oval, and round passes, the wires were produced from the strip in rolling process without using universal mill.
(2) By using Type A-51 roller-dies, having flat rollers for the first rollers and round rollers for the second rollers, wires were produced in nearly a half number of passes of that of ordinary caliber rolling.
(3) Drawing force for roller dies was in good agreement with that estimated by the equations derived by A. Geleji.
(4) The properties of E. C. Aluminum wires produced from the strip were almost the same as those of the wires drawn from hot rolled wire rods. However, the properties of the wires produced by drawing with roller dies were more excellent than those produced by caliber rolling.抄録全体を表示PDF形式でダウンロード (775K)
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