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58 巻, 12 号
選択された号の論文の6件中1～6を表示しています
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研究論文
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旗手 稔, 中村 幸吉, 炭本 治喜1986 年 58 巻 12 号 p. 831-836
発行日: 1986/12/25
公開日: 2011/10/25
ジャーナル フリーThe section sensitivity to mechanical properties of ductile cast iron was investigated in Y-block castings with section thickness of 12—75mm and 9—25mm. The graphite nodule number in 45kgf/mm2 grade iron increased when the section thickness became thin, silicon content increased and rare earth metal was added. The graphite nodule number varied from 97 counts/mm2 to 333 counts/mm2, but mechanical properties little changed with graphite nodule number. In the section thickness of 12—75mm, the section sensitivity to mechanical properties was scarcely recognized. However, the tensile strength decreased in the section thickness below 9mm and the elongation clearly decreased in the thickness below 12mm. It is surmised that these decrease in tensile strength and elongation is not caused by the size effect of the test pieces, but it is caused by the decrease in the size of spheroidal graphite. The small graphites may be not easily deformed and the whole deformation of the material may be retarded.抄録全体を表示PDF形式でダウンロード (695K) -
山本 志郎, 田代 康統, 佐伯 啓治, 竹林 一成, 川崎 正寿1986 年 58 巻 12 号 p. 837-842
発行日: 1986/12/25
公開日: 2011/10/25
ジャーナル フリーThe vibration of the molten steel surface during the pouring was applied to change the freezing manner of heavy wall steel casting with dome style using sand mold. Several results concernig improvement of internal soundness were confirmed in comparison with castings produced by conventional pouring method.抄録全体を表示PDF形式でダウンロード (663K) -
山田 始, 田中 他喜男1986 年 58 巻 12 号 p. 843-848
発行日: 1986/12/25
公開日: 2011/10/25
ジャーナル フリーIn the turning of CV graphite cast iron, the shear typed chip is formed as same as in spheroidal graphite cast iron. The cutting resistance of CV graphite cast iron is smaller than that of spheroidal graphite cast iron and greater than that of flake graphite cast iron. The tool life in the turning of CV graphite cast iron is longer than that in spheroidal graphite cast iron but shorter than that in flake graphite cast iron. The finished surface of CV graphite cast iron is superior to that of flake graphite cast iron and it is equivalent to that of spheroidal graphite cast iron. The fiake adhesion is observed when cutting CV graphite cast iron. However, its adhesive is very small and thin, and hardly grows. Furthermore, the increase of cutting resistance due to the flank adhesion is scarecely observed.抄録全体を表示PDF形式でダウンロード (710K) -
中江 秀雄, 折井 敬1986 年 58 巻 12 号 p. 849-854
発行日: 1986/12/25
公開日: 2011/10/25
ジャーナル フリーFe-C-Si alloys encased by molten glass were successively melted and solidified in mullite crucible to obtain large undercooling, i.e. by so-called, glass-encased technique. By means of molten glass encasing, metal was impeded from direct contact with crucible and non-metallic inclusions which act as nucleating agent during solidification were eliminated. Four kinds of glasses were prepared, i.e. soda-lime glass, alkali-free glass and two kinds of synthetic glasses which consisted of Na2O and alkali-free glass. In each glass, successive repetition of melting and solidification of samples were carried out and influence of the respective glass on the undercooling of primary γ, γ-graphite eutectic and γ-Fe3C eutectic phases was measured.
The degree of undercooling apparently depends on the kind of glass. When melt was encased by alkali-free glass, the undercooling of primary γ and γ-graphite eutectic phases increased with number of repetition of melting and solidification, but by soda-lime glass, that of γ-graphite eutectic phase did not increase.抄録全体を表示PDF形式でダウンロード (644K) -
渋谷 慎一郎, 鬼沢 秀和, 加藤 政治郎, 吉田 千里, 須藤 正俊1986 年 58 巻 12 号 p. 855-861
発行日: 1986/12/25
公開日: 2011/10/25
ジャーナル フリーThe microstructure and mechanical properties of high strength ductile cast iron which were produced by addition of alloy elements, tempering, quenching-tempering or austempering were investigated. The austempered ductile cast iron showed the best mechanical properties among them. Tensile strength was about 100 kgf/mm2 and the elongation was 9 to 15%. In as-cast condition, the high strength ductile cast iron with small amount of molybdenum, nickel and copper had tensile strength of 90 kgf/mm2 and elongation of 2.8%. The low elongation was caused by the formation of molybdenum carbide at eutectic cell boundaries.抄録全体を表示PDF形式でダウンロード (750K) -
堀江 皓, 斉藤 実1986 年 58 巻 12 号 p. 862-867
発行日: 1986/12/25
公開日: 2011/10/25
ジャーナル フリーThe neutralization by cerium of the harmful effect of sulfur and selenium on the formation manner of spheroidal graphite was investigated. The base metal with carbon content of 4.35%, composed of electrolytic iron and electrode graphite, was melted in a fused silica crucible in an electric resistant furnace, and sulfur and selenium were added to the melt before the addition of cerium, and then at 1,350°C the melt was treated with Fe-Si-Mg (21.4%) alloy and cooled to room temperature. Some of the specimens were quenched into water before eutectic solidification. The graphite structure was observed and the degree of spheroidization was determined microscopically.
The amount of sulfur and selenium remaining in the specimens gradually decreases with increasing cerium, and it results in disappearance of degenerated graphite and improvement of the degree of spheroidization by proper addition of cerium. In these specimens a large number of granular compounds were observed. Quantitative EPMA and X-ray diffraction analysis show that the compounds in the specimen in which the harmful effect of sulfur was suppressed by pure cerium are CeS and Ce2S3, while the compound in one with selenium and cerium is Ce2Se3.抄録全体を表示PDF形式でダウンロード (737K)
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