巻号一覧
後続誌
65 巻, 11 号
選択された号の論文の9件中1～9を表示しています
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研究論文
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大井 健次, 戸田 広朗, 寺嶋 久栄1993 年 65 巻 11 号 p. 827-832
発行日: 1993/11/25
公開日: 2011/06/22
ジャーナル フリーThermal cycles consisting of 1623 K peak temperature and 270∼0.4 K/s cooling rate were applied for nine kinds of Ti-6 Al-4 V alloys of 0.17 mass % to 2.35 mass % oxygen content, which made using the arc-melting furnace, to fundamentally investigate the effects of cooling rate and oxygen content on the microstructure and the hardness of Ti-6 Al-4 V alloys. These experiments made clear that the critical cooling rates to create a martensitic microstructure and a grain boundary α became higher with increasing the oxygen content of Ti-6 Al-4 V alloy, and that the hardness of Ti-6 Al-4 V alloy was increased with an increase in oxygen content and/or cooling rate of Ti-6 Al-4 V alloy. Furthermore, a new concept of characteristics of surface hardened layer of Ti-6 Al-4 V alloy investment casting was presented, based on the above mentioned experimental results.抄録全体を表示PDF形式でダウンロード (781K) -
山田 俊宏, 名取 達雄, 功刀 能文1993 年 65 巻 11 号 p. 833-838
発行日: 1993/11/25
公開日: 2011/06/22
ジャーナル フリーBoth fracture and wear process of electroless Ni-P plating on cast iron have been studied by rolling contact under the dry condition. Ni-P films were deposited on flaky graphite cast irons. The rolling-10 % slip wear test was carried out at 210 rpm of rotating speed and 245 N of load. Wear characteristics, change of surface and microstructure of the films were simultaneously observed. The plated specimens were heated from 453 K to 923 K in order to control the crystal structure of the film. The results obtained here are as follows : (1) Wear characteristics of the plating films was extremely changed with the heating temperature, that is to say, crystal change. (2) The plating film was fractured at early stage of rolling when specimens were heated below 823 K. (3) Number of rolling when film fracture on the rolling surface was observed was increased by increasing heating temperature above 823 K. (4) It was shown that wear resistance of the plating film was improved by heating beyond 823 K. (5) It could be concluded that fracture and wear characteristics were influenced by mechanical property change of film itself induced by heating.抄録全体を表示PDF形式でダウンロード (916K) -
笹栗 信也, 松原 安宏, 大城 桂作1993 年 65 巻 11 号 p. 839-845
発行日: 1993/11/25
公開日: 2011/06/22
ジャーナル フリーA 26 % Cr eutectic cast iron and steels varying chromium, nickel or carbon content independently were copper brazed under a bonding condition of 1383 K × 0.6 ks, and the effects of alloying elements on the microstructure of bonded zone and the bond-strength were clarified. Length (LA) of rod-like crystals which precipitate at cast iron side of bonded zone and width (WB) of the bonded zone increase with an increase in chromium content, and which leads to larger bond-strength (τB). Nickel delays both precipitation of the rod-like crystals and growth of bonded zone, but the τB increases. The LA and the WB decrease and the τB lowers as carbon content increases. When carbon increases over a critical content, the rod-like crystals crystallize at the steel side and the LA and the WB also become larger. Since chromium, nickel and carbon change the chemical potential of the iron in steel as well as in molten copper adjacent to the steel, the bonding process is resultantly influenced by these alloying elements.抄録全体を表示PDF形式でダウンロード (881K) -
林 守仁, 辰本 信哉1993 年 65 巻 11 号 p. 846-852
発行日: 1993/11/25
公開日: 2011/06/22
ジャーナル フリーIt is tried to make ceramics particle dispersion strengthened metal matrix composite inexpensively by casting with the process of stirring. For the purpose, it is paid attention to remove the absorbed gases, which act to reduce wettability on the particle surface to molten metal for dispersing SiC particles into AC8A matrix. As a result, by these processes, heating particles in argon gas, effusing particles by hot argon gas, blowing down particles directly to the surface of molten metal it becomes possible to make the composite. However, gas is easy to be trapped into molten metal by stirring, so it is necessary to get rid of bubbles by pressure process. And it is found that the particle size below 0.61 μm is too fine to disperse uniformly, and in such a case it takes too long time for addition of particles. As to the mechanical properties of composite, they are dependent on the state of dispersion of particles. Finally, the proof stresses of 0.02 % strain of the composites show sound agreement with the theory of Ashby.抄録全体を表示PDF形式でダウンロード (1448K) -
大出 卓, 堀 裕一1993 年 65 巻 11 号 p. 853-859
発行日: 1993/11/25
公開日: 2011/06/22
ジャーナル フリーDirect austempering (DAT) process of spheroidal graphite cast iron has continuous heat cycle from casting to austempering of the iron. Namely, DAT process is successive producing system of austempered spheroidal graphite cast iron (ADI) in organic combination with casting, austenitizing and bainitizing heat cycle. The DAT process which was developed in this study was made up three parts of upright equipment ; graphite mold for casting, electric furnace for austenitizing and salt bath for bainitizing. The microstructure of ADI manufactured by DAT process was observed and investigated quantitatively under the various producing conditions of specimens. Much more nodule count of spheroidal graphite than the normal process was obtained by rapid solidification and austenitization, leading remarkable graphitization and austemperability. Even if the iron was manganese alloyed, the austemperability was practically unaffected by the fine-dispersion of the normal segregation in eutectic cellular boundary.抄録全体を表示PDF形式でダウンロード (1085K)
技術報告
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武蔵 弘毅1993 年 65 巻 11 号 p. 860-862
発行日: 1993/11/25
公開日: 2015/01/21
ジャーナル フリーPDF形式でダウンロード (1241K)
解説
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大原 伸昭, 加藤 榮一1993 年 65 巻 11 号 p. 863-869
発行日: 1993/11/25
公開日: 2015/01/21
ジャーナル フリーPDF形式でダウンロード (4117K) -
寺嶋 一彦1993 年 65 巻 11 号 p. 870-876
発行日: 1993/11/25
公開日: 2015/01/21
ジャーナル フリーPDF形式でダウンロード (3417K) -
小野 壮平1993 年 65 巻 11 号 p. 877-885
発行日: 1993/11/25
公開日: 2015/01/21
ジャーナル フリーPDF形式でダウンロード (5049K)
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