巻号一覧
後続誌
57 巻, 2 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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解説
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第2部 アジア地域の生産動向編集委員会1985 年 57 巻 2 号 p. 81-83
発行日: 1985/02/25
公開日: 2015/01/27
ジャーナル フリーPDF形式でダウンロード (1383K)
研究部会報告
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喜多 清1985 年 57 巻 2 号 p. 84-86
発行日: 1985/02/25
公開日: 2015/01/27
ジャーナル フリーPDF形式でダウンロード (1782K)
研究論文
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上田 俶完, 谷 耕治1985 年 57 巻 2 号 p. 90-95
発行日: 1985/02/25
公開日: 2011/11/17
ジャーナル フリーThe use of olivine sand as a molding material is limited in comparison with silica sand, and characteristics of olivine sand are not sufficiently known. Previous papers by the authors described that the olivine sand mold prevents burning not only in the case of high manganese cast steel but also of low carbon cast steel. Metal-mold reactions between high chromium and austenitic stainless cast steels and olivine and silica sand molds were investigated in the present work. The olivine sand mold exhibited similar or better resistance to burning than the silica sand mold with the high chromium or austenitic stainless steels. Cr and Mn in the liquid steels reacted with the surface of the olivine sand and formed a smooth shell on the mold surface. The smooth shell had a high packed density of solid sand particles and prevented metal penetration. After cooling, therefore, castings could be easily peeled off and showed no burning. But in the silica sand mold similar smooth shell was formed only with 25% chromium and austenitic steels. Quartz (silica sand) and olivine (dunite in olivine sand) scarcely reacted with Cr and/or Mn in the liquid high chromium steel. Neither Cr nor Mn were detected inside the quartz or the olivine caught in the smooth shell layer.抄録全体を表示PDF形式でダウンロード (1043K) -
岩渕 義孝1985 年 57 巻 2 号 p. 96-101
発行日: 1985/02/25
公開日: 2011/11/17
ジャーナル フリーStudies were made on the effects of chemistry and heat treatment on mechanical properties, fatigue strength and intergranular corrosion (I.G.C) of 19Cr-9Ni austenitic stainless cast steels. The results are summarized as follows.
(1) Mechanical strength increases with the increase of delta ferrite and nitrogen contents as expressed by the equation;
0.2% Y.S. (kgf/mm2)=0.34(%δ)+33(%N)+16.2
(2) Smooth and notched bar fatigue strengths are improved by increasing the machanical strength.
(3) I.G.C. is developed at the δ/γ grain boundaries and the degree of I.G.C. caused by slow cooling during heat treatment can be predicted from the time to pass the sensitizing region in the TTS diagram.
(4) Since the diffusion rate of chromium element in the delta phase is much higher than that in the austenite phase, sensitized steel can be recovered by re-heating at 700°C for 10h, if some amount of delta phase is contained.抄録全体を表示PDF形式でダウンロード (660K) -
杉下 潤二1985 年 57 巻 2 号 p. 102-107
発行日: 1985/02/25
公開日: 2011/11/17
ジャーナル フリーAl-11%Si alloy composite castings with partially dispersed carbon balloons, flake graphites and ceramic particles were fabricated using a centrifugal casting method, and checked for the wear and impact resistance. The results obtained are as follows. 1) When the dispersive particles have no wettability with the molten metal, the addition of oxidized ceramics or metallic perticles is very effective to form the most desirable dispersed layers near the surface of the castings. 2) If the position of the dispersive materials with respect to the base alloy in the mold is constant, the thickness of the dispersive layer is dependent mainly on casting temperature and G number. 3) Impact resistance of the composites with the dispersive layer of 0.75mm in width decreases by approximately one-half compared to the base alloy, AC3A. 4) The wear resistance of the castings containing WA700 particles increases by about three times that of the base alloy.抄録全体を表示PDF形式でダウンロード (818K) -
岡林 邦夫, 川本 信, 池永 明, 辻川 正人, 野村 和弘1985 年 57 巻 2 号 p. 108-112
発行日: 1985/02/25
公開日: 2011/11/17
ジャーナル フリーTension, Charpy impact and fracture toughness tests were made on hyper-eutectic Al-Si alloy castings containing Si up to 20% and having primary Si particles up to 42μm in diameter in order to clarify the effects of coarse and hard particles dispersed in a matrix on the fracture properties. Cracks in the alloy propagate by successive cleavage of primary Si particles. The crack propagation behavior is governed by the primary Si particles. If the particle diameter is constant, an alloy having more of the particles has lower resistance to crack propagation. If the volume ratio of the primary Si is constant, the resistance to crack propagation depends on 1/√D, where D is the particle diameter.抄録全体を表示PDF形式でダウンロード (673K) -
香川 明男, 岡本 平1985 年 57 巻 2 号 p. 113-119
発行日: 1985/02/25
公開日: 2011/11/17
ジャーナル フリーA theoretical approach to graphitization of cast iron has been made in terms of the effect of alloying elements on both the stable and metastable eutectic temperatures. Equations for changes in the eutectic temperatures and the eutectic compositions were introduced on the basis of iron-carbon binary phase diagram. The influence of alloying elements on the temperature difference between the stable and metastable eutectic temperatures was related to the thermal stability of the phases existing during the eutectic solidifications. The relation of two parameters, that is, the partition behavior of alloying elements between cementite and austenite and the effect of alloying elements on the carbon activity in liquid iron, to graphitization of cast iron was examined. It was revealed that the former was related to the effect on the difference between the two eutectic temperatures, and hence, to graphitization of cast iron, while no strict relation was found between the latter and graphitization of cast iron.抄録全体を表示PDF形式でダウンロード (734K) -
李 鏞河, 井ノ山 直哉, 川野 豊, 山本 悟, 原 邦夫1985 年 57 巻 2 号 p. 120-127
発行日: 1985/02/25
公開日: 2011/11/17
ジャーナル フリーPrior to experimental investigation, the characteristics of the components of inoculants and empirically obtained facts on inoculation were discussed in connection with the formation and stability of cementite. Based on this discussion the mechanism of inoculation was assumed as follows ; the action of inoculation is, in its essence, elimination of gas elements dissolved in the molten iron to stabilize cementite. Fading is due to the reabsorption of gas elements during holding of the melt. Experiments have been carried out to prove this hypothesis. When nitrogen content dissolved in cast iron is reduced, not only with inoculation but also without inoculation, chill is inhibited. Further, under the condition of decreased pressure, fading does not occur in an inoculated iron melt. These facts support the author's degassification theory on the mechanism of inoculation.抄録全体を表示PDF形式でダウンロード (792K)
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