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51 巻, 12 号
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研究論文
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中江 秀雄, 清祐 等, 岡田 千里1979 年 51 巻 12 号 p. 684-690
発行日: 1979/12/25
公開日: 2012/06/02
ジャーナル フリーIt has been supposed that the inoculation in cast iron is affected by the sulfur content in the melt. The present experiment was carried out to verify this hypothesis. Inoculation is more effective for low sulfur melt than high sulfur melt. The effect of inoculation decreases by the formation of sulfide with potent inoculating elements in the inoculants, such as Ca, Sr, Ba, Ce and etc. Moreover, segregation and surface adsorption of sulfur suppress the eutectic solidification rate. The most significant inoculating effect was observed in case of melt containing about 0.03% sulfur. The practical evaluation of the effect of inoculation should be based on the degree of increase of tensile strength of iron and the decrease in chilling. Measures of selecting inoculants have been proposed, based on the purpose of inoculation and sulfur content of melt.抄録全体を表示PDF形式でダウンロード (726K) -
松田 政夫1979 年 51 巻 12 号 p. 691-696
発行日: 1979/12/25
公開日: 2012/06/02
ジャーナル フリーThis paper deals with the temperature distribution of molten metal in the mold for casting plate with uniform thickness. The molten metal flows with a constant velocity inside the metal layers after flowing through the range where once formed metal layers have been remelted. The dimentionless superheat temperature Θp is defined as follows : Θp=(θp−θr)/(M/√λcγ), where θp is the initial temperature, θf the melting point of metal, M the mold constant, λ the thermal conductivity, c the specific heat and γ the specific weight of molten metal. The values of the remelted zone fraction α were then defined by the ratio of the remelted distance of the metal layers to the total are shown by a chart as the function of Θp and the Fourier number τ. The average superheat temperature θm−θf of the molten metal is expressed in the relation with θp−θf, M, √λcγ, τ and α.抄録全体を表示PDF形式でダウンロード (710K) -
喜多 清, 日野 春樹, 田中 照司1979 年 51 巻 12 号 p. 697-702
発行日: 1979/12/25
公開日: 2012/06/02
ジャーナル フリーAs for the descent of temperature of castings after pouring, it became more rapid in the order of V-process-full mold process, V-process, Full mold process, Furan resin mold process and CO2 process. This difference was attributed to the heat transfer rate. In regard to the mechanical properties of cast steel, elongation and reduction of area increase as cooling rate of castings decrease, but proof stress and tensile strength increase as cooling rate of castings increase. The mechanical properties of spheroidal graphite cast iron improved as solidification time became longer. The effects of Full mold and V-process-full mold on the microstructure were found on the surface appearance in cast steel, but not in shperoidal graphite cast iron.抄録全体を表示PDF形式でダウンロード (793K) -
鈴木 克美, 小山 和夫1979 年 51 巻 12 号 p. 703-708
発行日: 1979/12/25
公開日: 2012/06/02
ジャーナル フリーIt is well known that cast iron slowly melted or held for a long time at high temperatures are apt to chill, even if they have the same chemical compositions. This phenomenon is attributable to the disappearance of graphite nucleus. This nucleus is considered to be the remaining micro-graphite particles which were brought from the graphites in charged materials and in recarburizers, because they require some time to dissolve completely. It is reasonable, therefore, that irons slowly melted in low frequency induction furnace tend to chill more than irons quickly melted in cuploa. However, even in irons melted in the induction furnace, the remaining graphites can be increased by adding recarburizer just before tapping. As it is known that graphite precipitation is affected by sulfur content, some experiments with irons of various sulfur content have been made. Chill depth was minimum when the recarburizer was added to the melt containing about 0.12%S just before tapping.抄録全体を表示PDF形式でダウンロード (745K) -
雄谷 重夫, 戸田 善久1979 年 51 巻 12 号 p. 709-714
発行日: 1979/12/25
公開日: 2012/06/02
ジャーナル フリーA bar-shape hot tearing test and measurements of freezing contraction were carried out on brasses containing elements such as Pb, Si, Sn, Al, Ni and Mn to give variety to the dendritic structure. The α-phase in the binary Cu-Zn alloys grows more dendritically than the β-phase. The β-phase grows in nearly a cellular form. The α-phase binary Cu-Zn alloys have less fraction solid at contraction start and poorer resistance to hot tearing than the β-phase alloys. The proportion of the secondary dendrite arm length to the spacing increases and the tear-resistance is weakened both in α-brasses containing Si and Sn and in the β-brasses containing Pb, Si, Sn and Al. The fraction solid at start of contraction decreases with increasing the proportion of the secondary arm length to the spacing.抄録全体を表示PDF形式でダウンロード (770K) -
炭本 治喜, 中村 幸吉1979 年 51 巻 12 号 p. 715-720
発行日: 1979/12/25
公開日: 2012/06/02
ジャーナル フリーIn the static bending test, load in opposite directions is given on either side of the neutral axis. And it is known that the neutral axis shifts toward the side of the compression in cast iron without regard to the shape of the graphite-spheroidal or flaky. This is due to the presence of graphite, but the details of the role and behavior of the graphite have been not clarified. The microscopic analysis of deformation behavior of graphite will thus povide a guide in evaluating the toughness of cast iron (chiefly of spheroidal graphite cast iron). In this study, the displacement of the neutral axis in impact bending test and the deformation behavior of graphite in cast iron receiving static tensile load or compressive load were examined.
In the impact fracture, the breadth of tensile stress side is larger than that of compressive stress side and, therefore, the neutral axis is shifted toward the compressive side. When tensile load is given, the outer layers of the spheroidal graphite are stripped and move so that they fill up the space between graphite and matrix. On the other hand, when compressive load is given, the deformation and fracture of graphite progress as it shows resistance against the load. Therefore the deformation behavior under compressive load is essentially different from that under tensile load. It is considered that the graphite not only act as a mere “Vacant space”, but has a certain role in the total deformation of spheroidal graphite cast iron.抄録全体を表示PDF形式でダウンロード (762K)
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