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, 3 号
選択された号の論文の8件中1～8を表示しています
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五弓 勇雄1966 年 16 巻 3 号 p. 113-114
発行日: 1966/05/31
公開日: 2008/10/30
ジャーナル フリーPDF形式でダウンロード (262K) -
Al-Zr合金に関する研究 (第4報)荒木 喬, 小森 進一1966 年 16 巻 3 号 p. 115-119
発行日: 1966/05/31
公開日: 2008/10/30
ジャーナル フリーA part of precipitation hardening can be detected in hardness-annealing temperature curve which has been plotted for examining recrystallization characteristics.
The principal object of this study is to examine precipitation phenomena of Al-Zr alloys.
The results were summarized as follows.
(1) Chilled ingots of Al-Zr alloys were age hardened at 300-500°C both in as cast and as cold rolled state.
(2) Two-stepped aging treatment of Al-Zr alloys in as cast state was effective for improving hardness.
(3) Precipitates were ZrAl3 and Zr5Si3.抄録全体を表示PDF形式でダウンロード (680K) -
過共晶Al-Mn合金の研究 (第1報)市川 理衛, 大橋 照男1966 年 16 巻 3 号 p. 120-126
発行日: 1966/05/31
公開日: 2008/10/30
ジャーナル フリーThe effects of types of molds and sorts of additional elements on the cast structure and hardness of hyper-eutectic Al-Mn alloys were studied. The additional elements used were such considered to refine the primary crystals of the alloys, i.e., each 0.5-1% addition of Fe, Nb, W, Zr, V, Cu, Mg, Si, Ca, etc. The change of hardness by heat-treatment of these alloys was also examined.
The results obtained were as follows.
(1) It was found that the microstructures of Al-4% Mn Alloys were different from each other in sand mold castings, metallic mold castings, and die castings. It was observed that primary crystals were larger and angular in sand mold castings, but were finer in metallic mold castings. In die castings, especially, fine network microstructure, which would be regarded as supersaturated α solid solution, was observed.
(2) Remarkable variation was not observed on hardness of sand mold castings according to the sorts of additional elements. There was observed a difference of hardness between sand mold and metallic mold castings.
(3) Slight age-hardening was recognized on die castings having network microstructures when annealed at 360-500°C.抄録全体を表示PDF形式でダウンロード (2495K) -
過共晶Al-Mn合金の研究 (第2報)市川 理衛, 大橋 照男1966 年 16 巻 3 号 p. 127-133
発行日: 1966/05/31
公開日: 2008/10/30
ジャーナル フリーSome properties such as recrystallization temperature, hardness, structure, etc. of cold rolled and hot extruded Al-4% Mn alloys were studied.
Results obtained were as follows:
(1) The recrystallization phenomena after cold rolling of Al-1-4% Mn alloys prepared by sand mold casting depended upon pre-treatments before the rolling. It was found that the recrystallization temperature of these alloys after heat treatment at 630°C was higher in the case of water quenching than that of slow cooling.
(2) The recrystallization temperature of rolled Al-4% Mn prepared by metallic mold casting was found to be about 425-450°C, being higher than that of the said alloys prepared by sand mold casting.
(3) The microstructure of extruded binary Al-4% Mn alloys and most of the said alloys containing 0.5-1.0% of each one of additional elements (such as Ca, Cr, Fe, Mg, Nb, Si, Ti, V, and Zn) was found to be very fine. Especially, in metallic mold casting, the formation of these fine structures was caused by containing fine compounds, which had been precipitated from α solid solution during the extrusion at 550-580°C.抄録全体を表示PDF形式でダウンロード (1334K) -
佐々木 光夫, 藤田 良武, 山田 始1966 年 16 巻 3 号 p. 134-139
発行日: 1966/05/31
公開日: 2008/10/30
ジャーナル フリーMany studies have already been made on grain refining of cast structure of aluminum, and Ti and Ti-B have widely been used as the most effective grain refiners.
However, few investigations were made on the effects of the presence of small amounts of other elements on grain refining of aluminum by these refiners.
Accordingly, these studies were undertaken to achieve the effects of Fe, Si, Cu, Mg, Zn, or Zr on grain refining of aluminum by the addition of Ti or Ti-B.
The results obtained were as follows:
(1) The effects of grain refining by Ti and Ti-B were enhanced by the presence of Fe, Si, Cu, Mg, Zn or Zr. Among these, Si was the most effective, and Mg was the second.
(2) A relation was given between the amounts of Ti and Si or between Ti and Mg required for the grain refining of cast structure of aluminum.
For instance, grain refining of 99.99% Al was markedly enhanced by the presence of Si (over 0.65%) or Mg (over 0.8%) for 0.01% of Ti, and it was also enhanced by the presence of Si (over 0.05%) or Mg (0.1%) for 0.05% of Ti.
(3) The effects of grain refining by the addition of Ti alone were remarkably weakened when casting temperature was high, whereas the effects by the addition of Ti-B less depended upon the temperature. When Si or Mg was added together with Ti, the results were almost the same as that of Ti alone; but the critical casting temperature, at which a conspicuous weakening of grain refining was seen, was higher than that of Ti alone.抄録全体を表示PDF形式でダウンロード (1166K) -
財満 鎮雄, 加茂 進, 松山 昌治1966 年 16 巻 3 号 p. 140-146
発行日: 1966/05/31
公開日: 2008/10/30
ジャーナル フリーThe reaming tests on several kinds of wrought aluminum alloys were carried out for the purpose of examining machinability and finding proper reaming conditions. The kinds of alloy specimens used were 17ST4 (Hv=123), 24SF (Hv=103), and 56SF (Hv=103). The results obtained were summarized as follows:
1) In the case of the reaming at a constant feeding speed, torque greatly increased, but thrust slightly increased with the increase of the depth of reaming. The difference of reaming resistance, especially the difference of torque, among the kinds of alloys was rather great. The experiments showed that the ascending order of torque was 17ST4<24SF<56SF.
2) In the case of reaming under constant feeding load, torque was less affected by feeding load at a constant depth of reaming. The difference of torque among the kinds of alloys was clear when the diameter of predrilled hole was small (the torque of 56SF was the largest as mentioned above), but it was not so clear when the diameter was large and at a small depth of reaming.
3) In the case of reaming for 8.5mm, the enlargement of the diameter of the hole was in the range of 40-100μ regardless of the methods of reaming. Out-of-roundness of reamed hole (expressed by the difference between the maximum diameter and the diameter perpendicular to it) was in the range of 0-60μ.
4) The roughness of the surface of reamed hole was always in the range of 3-9μ.抄録全体を表示PDF形式でダウンロード (854K) -
井上 真由美1966 年 16 巻 3 号 p. 147-156
発行日: 1966/05/31
公開日: 2008/10/30
ジャーナル フリーIn Japan Air Self-Defense Force, serious corrosion problems were encountered, regarding to the presence of the microorganisms in JP-4 fuel. Fuel was dripping from a tank in jet fuel aircraft. Microorganisms were cultured after being isolated from the JP-4 fuel underground storage tank, tank-lorry, water separator, and aircraft fuel tank. The effects of microbiological corrosion were examined on the specimens of 61-S aluminum alloy which was used in aircraft fuel tanks.
The results were as follows:
(1) Seventeen sorts of bacteria and three sorts of fungi were found to be bred by the utilization of JP-4 as nutritious element.
(2) After culturing for 140 days, the surfaces of some aluminum specimens were covered with brown powdery blisters caused by the growth of microorganisms and other contaminations.
(3) Severe corrosion pits were made on aluminum specimens, on which Micrococcus caseolyticus, Comamonas, and Vibrio faecalis were cultured.
(4) It was observed that the surface of aluminum alloy specimens was covered with mycelium mats of Cladosporium resinae and tremendous corrosion existed under the mats.
As the results, it is concluded that the preparation of filter-separator equipment such as ultrafine filter will be effective for the purpose of perfect removal of microorganisms from aircraft fuel.抄録全体を表示PDF形式でダウンロード (3066K) -
ダイカスト用軽合金に関する研究 (第1報)磯部 俊夫, 花田 章, 佐藤 京司1966 年 16 巻 3 号 p. 157-163
発行日: 1966/05/31
公開日: 2008/10/30
ジャーナル フリーThe object of this study was to know the effects of various die casting conditions such as injection pressure, locking force, injection speed, sleeve temperature, chill period, molten metal temperature, automatically controlled mold temperature, and injection speed ratio on the mechanical properties of ADC12 alloy products (ASTM E8 test bar). The die casting machine used in our laboratory was of DC 250 type, which can record the measuring results of the above casting conditions and also can control the mold temperature. The results obtained were as follows:
1. Injection pressure and locking force gave almost no effects on the mechanical properties of ASTM test bar.
2. Mechanical properties decayed at extremely high or low injection speed, but they were improved with the increase of injection speed, because the pressure increased immediately after filling molten metal into the cavity, whereby beneficial effects were given on the strength of the products.
3. Higher casting temperature (680°C) was recommended for better mechanical properties from the viewpoints of fluidity and castability of molten metal.
4. Mechanical properties decayed with the elevation of mold temperature.
5. They were the best at the injection speed ratio of 1 to 1.
6. Mechanical properties of ASTM test bar, were independent of the chill period of 5-10 seconds.抄録全体を表示PDF形式でダウンロード (1628K)
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