巻号一覧
後続誌
66 巻, 1 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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研究論文
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大井 健次, 寺嶋 久栄, 戸田 広朗1994 年 66 巻 1 号 p. 3-9
発行日: 1994/01/25
公開日: 2011/06/15
ジャーナル フリーCooling process during Ti-6 Al-4 V alloy investment casting has been simulated to make clear the relationship between cooling rate, microstructure and hardness of the alloy, and also to investigate the performance of it. Furthermore, cooling rate on the inside face of mold during investment casting has been measured to estimate cooling behaviour of Ti-6 Al-4 V alloy, because direct measurement of cooling rate of Ti-6 Al-4 V alloy poured into the mold may well be impossible. Martensitic transformation, accompanied with diffusion of solute elements, is considered to be produced in Ti-6 Al-4 V alloy castings when cooled from 1273 to 1073 K at the cooling rate of more than about 20 K/s. Microstructure of as-cast Ti-6 Al-4 V alloy is determined by the cooling rate of 1273 to 1073 K during casting and as-cast microstructure of Ti-6 Al-4 V alloy can be classified into three types by the cooling rate ranging 1273 and 1073 K. Within the cooling rate presenting martensitic microstructure an increase in the cooling rate greatly increases the tensile strength and the hardness, and decreases the toughness of Ti-6 Al-4 V alloy.抄録全体を表示PDF形式でダウンロード (929K) -
加藤 鋭次, 村川 悟1994 年 66 巻 1 号 p. 10-14
発行日: 1994/01/25
公開日: 2011/06/15
ジャーナル フリーThe detailed microstructure and impact properties of Al-Si alloys which contained an amount of iron, had been investigated as a function of the addition of Cr and Be or Mn and Be. The shape of iron compound, which was formed during solidification of alloy containing an amount of iron, was the coarse needle-like compound. When small amounts of Cr and Be or Mn and be was added, the Chinese script shape of iron compound crystallized instead of needle-like compound. In case of alloys which contained iron above 0.5 %, there was a remarkable effect of Be addition with Cr or Mn. Casting alloys of 0.1 % Be addition with 0.2 % Cr were found to possess higher ductility and fracture toughness than casting alloys addition with 0.3 % Cr.抄録全体を表示PDF形式でダウンロード (726K) -
五家 政人, 森田 茂隆1994 年 66 巻 1 号 p. 15-19
発行日: 1994/01/25
公開日: 2011/06/15
ジャーナル フリーSand mold is very cost effective and applicable to production of general castings, and also is excellent in view of recyclic use. However the mold accuracy is inferior to the one for metal mold because of the nonuniformity of sand compaction and spring back phenomena during molding process. The mold accuracy is an important factor not only for casting accuracy but also for casting burrs. The mold accuracy consists of two main factors, which are the flatness of parting line and the accuracy of cavity contour. This study reports the former accuracy from the view point of measuring method, affecting factors and relation to casting burrs and dimensional accuracy of castings. The result obtained are : (1) Mold flatness can be precisely measured by LED distance meter. (2) Factors affecting mold flatness are the rigidity and flatness of carrier plate, and spring back of the mold. (3) Mold flatness usually shows slightly convex profile, and it causes casting burrs and large dimensional variation when exceeding some level.抄録全体を表示PDF形式でダウンロード (640K) -
小野 修二, 松尾 信太郎, 斉藤 正洋, 川添 強1994 年 66 巻 1 号 p. 20-24
発行日: 1994/01/25
公開日: 2011/06/15
ジャーナル フリーIn order to develop a new marine propeller material having 1.5 times as much as corrosion fatigue strength and erosion resistance of nickel aluminum bronze in sea water, effect of solution temperature (1173∼1223 K) on microstructure and mechanical properties of new high strength 18 % Cr cast stainless steel was investigated. The results are summarized as follows : (1) Tensile strength and 0.2 % proof stress decrease but elongation increases with rise of solution temperature. These tensile properties satisfy the target of the new steel, in case of solution-treatment at 1198∼1223 K. (2) A very small amount of carbide is precipitated in the microstructure of the steel solution-treated at temperatures below 1198 K. From the above mentioned results, it is concluded that 1198∼1223 K is suitable for solution temperature of the new high strength 18 % Cr cast stainless steel.抄録全体を表示PDF形式でダウンロード (652K) -
金 聖均, 梅田 高照, 村田 清, 桜井 大八郎, 南 三津男, 菅 道太郎, 今村 博人1994 年 66 巻 1 号 p. 25-30
発行日: 1994/01/25
公開日: 2011/06/15
ジャーナル フリーThe experimental and theoretical works are performed to develop the process for producing a container by centrifugal casting without cores. The production of cylindrical container castings can be made by dropping the metal volume below the critical solid fraction for the fluid flow with reducing/ stopping rotation of castings. The bottom thickness can be mainly controlled by a falling time. Coating materials and their thickness greatly influence the bottom thikness of castings. In this method the critical solid fraction for the fluid flow of drop is estimated as 0.3∼0.4.抄録全体を表示PDF形式でダウンロード (643K) -
新山 英輔, 安斎 浩一1994 年 66 巻 1 号 p. 31-37
発行日: 1994/01/25
公開日: 2011/06/15
ジャーナル フリーThe end cooling effects in plate castings of different alloys and molds were studied by numerical calculation of solidification time. The range of end effect is longer in aluminium alloy casting than in steel casting. End effect is longer in sand mold than in metallic mold. End effect is increased by increasing mold temperature or by increasing casting temperature. End effects becomes shorter if judged at a lower solid fraction. These effects are explained from the differences in such factors as heat diffusivity and latent heat of fusion. A hot spot occurs in a casting connected to a riser through a narrow neck, when the neck is longer than a critical length. The critical length depends on the cast metal, mold, mold temperature and casting temperature. It is closely related to the end effect in plate castings.抄録全体を表示PDF形式でダウンロード (689K)
技術報告
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秋山 茂1994 年 66 巻 1 号 p. 38-42
発行日: 1994/01/25
公開日: 2015/01/21
ジャーナル フリーPDF形式でダウンロード (2492K)
解説
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滝 勇1994 年 66 巻 1 号 p. 43-49
発行日: 1994/01/25
公開日: 2015/01/21
ジャーナル フリーPDF形式でダウンロード (3780K)
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