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後続誌
58 巻, 1 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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技術報告
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黒川 豊, 太田 英明1986 年 58 巻 1 号 p. 16-20
発行日: 1986/01/25
公開日: 2015/01/27
ジャーナル フリーPDF形式でダウンロード (2322K)
研究論文
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堀江 皓, 小錦 利憲, 阿部 喜佐男, 千田 昭夫1986 年 58 巻 1 号 p. 21-25
発行日: 1986/01/25
公開日: 2011/10/25
ジャーナル フリーIrons containing sulfur from 0.004 to 0.15% were melted in a high frequency induction furnace and nodularization treated at 1,530°C by adding 1.6wt% of Fe-Si-Mg alloy together with various amounts of mishmetal. Different amounts of RE were also added before nodularization treatment to determine the effect of RE addition time on nodule count. The melt was post-inoculated with 0.4% Fe-Si and was cast in CO2 molds 3, 6 and 9mm in mold cavity thickness and in knock off-type shell molds of 30mm diameter and 150mm length. The chilled structure and nodule count were image analyzed. The nodule count is enhanced by adding RE in the stoichiometric amount to the sulfur content of base iron. The difference of nodule count between the irons containing and not containing RE extends with the cooling rate. The high sulfur iron to which RE has been added before nodularization treatment has lower nodule count, less sulfur and less cerium than the RE added iron.抄録全体を表示PDF形式でダウンロード (744K) -
岡田 明, 三宅 秀和, 尾埼 良平1986 年 58 巻 1 号 p. 26-32
発行日: 1986/01/25
公開日: 2011/10/25
ジャーナル フリーDifferential thermal analysis and microscopy were made on hypereutectic white cast iron heated at constant rates. The hypereutectic iron is graphitized further easily than the hypoeutectic iron, because “frozen in” carbon microgroups easily play a role of nucleous for graphite. Endothermic, exothermic and endothermic reactions are found on the differential thermal analysis curves in a temperature range from 1,125°C to 1,140°C. These reactions are stronger and more complicated than those in hypoeutectic iron. This phenomenon is caused by easiness of cementite graphitization, solution (diffusion) of cementite in the mosaic-structure (γ and cementite) at about 1,125°C, precipitation of graphite from γ saturated with respect to cementite, and resolution of cementite into carbon-deficient γ at about 1,140°C. Primary cementite acts as sources of deposited graphite and solvent (γ) of cementite.抄録全体を表示PDF形式でダウンロード (929K) -
寺嶋 一彦, 野村 宏之, 坂野 武男, 臼井 祥枝1986 年 58 巻 1 号 p. 33-39
発行日: 1986/01/25
公開日: 2011/10/25
ジャーナル フリーThe first water injection at the start of mulling process was followed by the second water injection for potentially controlling moldability of green sand. A slide-type moldability sensor has been developed for on-line measurement of moldability index. The steady-state value of moldability index can be predicted from the early transient response of moldability index by introducing the autoregressive model. The optimal amount of water in the second water injection to control the moldability index at 75 accepted as a temper point value was determined and related with the moldability index predicted from experiments. This control method is reasonable with respect both to control precision and mulling time.抄録全体を表示PDF形式でダウンロード (702K) -
桑野 正司, 大城 桂作, 沢本 章, 松田 公扶1986 年 58 巻 1 号 p. 40-45
発行日: 1986/01/25
公開日: 2011/10/25
ジャーナル フリーInfluences of vanadium on martensitic and eutectoid transformations of 5 and 15%Cr irons containing 1.6 to 4.0%C, 5 to 8%V and 0.2%Ti were dilatometrically investigated. The irons were heated at temperatures from 800° to 1,200°C for 100min, and cooled rapidly to room temperature by argon gas jet. The hardness of the irons attains the maximum and remarkably lowers as the annealing temperature is elevated. 5%Cr iron annealed at 1,000°C and 15%Cr iron annealed at 1,130°C have their maximum hardness Hv 750 and 840 respectively. Cr and V decrease carbon solubility in austenite. 15%Cr cast iron with V should be austenitized at higher temperatures to get the maximum hardness. The sharp drop of quenched hardness at higher austenitizing temperatures is caused by retained austenite. Vanadium raises the eutectic temperature at ratios of 10°C/V(%) in 5%Cr cast iron and 20°C/V(%) in 15%Cr iron, but lowers the critical cooling rates of both 5 and 15%Cr cast irons.抄録全体を表示PDF形式でダウンロード (672K) -
田中 照司, 末光 毅, 藤岡 順三, 西山 幸夫, 福迫 達一1986 年 58 巻 1 号 p. 46-52
発行日: 1986/01/25
公開日: 2011/10/25
ジャーナル フリーThis work was carried out to develop a manufacturing technology of directionally solidified (DS) or single crystalline (SC), and solid or cored turbine blades as long as 100mm. The stable ignition of exothermic material which ensures uniform mold heating is required for producing DS or SC blades with a high yield. It is achieved by adopting a furnace ignition method and controlling elapsing time after ignition. The maximum length 150mm or more obtainable of DS structure depends on thickness of specimens, design of starters and the like. Properties of DS specimens thus produced are comparable to those of withdrawal-processed specimens. The application of the process to cored blades is not so much difficult and even intricately cored SC blades of 60mm length are successfully produced.抄録全体を表示PDF形式でダウンロード (735K) -
生井 亨, 大沢 嘉昭, 菊地 政郎1986 年 58 巻 1 号 p. 53-58
発行日: 1986/01/25
公開日: 2011/10/25
ジャーナル フリーA feasibility to produce particle dispersed gray iron was examined by means of a gas atomizing method. Sliding wear tests were also performed on the particle dispersed iron. Particles of alumina, carborundum and graphite 25μm or more in size are successfully dispersed in cast iron by atomizing at 1,350°C and 10kgf/cm2 in gas pressure. Cast iron containing a larger amount of graphite than usual can be produced by the method in which iron is quenched after graphite dispersion. Characteristic reacted layers are formed around the dispersed particles by quenching after dispersion of such particles having interaction with iron melt as carborundum, graphite, iron powder, ferrosilicon and chromium-carbide. Irons including larger amounts of hard particles have a resistance to wear loss.抄録全体を表示PDF形式でダウンロード (771K)
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