巻号一覧
後続誌
54 巻, 7 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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研究論文
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恒川 好樹, 篠沢 民夫1982 年 54 巻 7 号 p. 423-428
発行日: 1982/07/25
公開日: 2011/12/29
ジャーナル フリーCompacted/vermicular graphite cast irons containing different amounts of C and Si were prepared through the addition of Ca-type CV graphitizing reagents. A comprehensive investigation was made of the effect of C and Si on the cementite crystallization, section thickness sensitivity and external shrinkage in light section castings of CV graphite cast iron. The CV graphite cast iron treated with a Ca-type CV graphitizing reagent has a lower critical carbon equivalent for cementite crystallization than that treated with a Mg-type reagent. It is also superior in section thickness sensitivity and external shrinkage. The section thickness sensitivity moderates and the ratio of CV graphite in total graphite rises particularly in the light section with lowering of C content. The external shrinkage moderates at higher C and Si contents. Coarse graphite nodules appear, however, if the carbon equivalent exceeds 4.7.抄録全体を表示PDF形式でダウンロード (699K) -
安江 和夫, 磯谷 三男, 近藤 靖彦, 河合 真1982 年 54 巻 7 号 p. 429-433
発行日: 1982/07/25
公開日: 2011/12/29
ジャーナル フリーInfluence of mean strain on fatigue life (Nf) of flake graphite cast iron (FC25) and spheroidal graphite cast iron (FCD45) were studied. Effects of matrix structure on the mean strain dependence were discussed. Nf of spheroidal graphite cast iron with pearlite matrix is dependent on the mean strain, but that of FCD45 with ferrite matrix is independent. The relationship of Nf and mean strain agrees approximately with the fatigue theory assuming that mean strain is the residual strain. Nf of FC25 is affected by mean strain not only in ferrite matrix but also pearlite matrix. A characteristic of cast iron is significantly shown, that is, Nf of FC25 is weak to tension and is strong against compression.抄録全体を表示PDF形式でダウンロード (585K) -
塩田 俊雄, 小松 真一郎1982 年 54 巻 7 号 p. 434-439
発行日: 1982/07/25
公開日: 2011/12/29
ジャーナル フリーRotational bending tests of ferritic spheroidal graphite cast irons containing different graphite nodule diameters were carried out. The cast irons were prepared by solidifying the same molten metal at different cooling rates. Reduction in the graphite nodule diameter results in reducing the ferrite grain size, increasing the graphite nodule count, and also increasing the tensile strength, fatigue strength and endurance ratio. The external notches increase the static tensile strength due to the triaxial stresses, but decrease the fatigue strength remarkably with the external-notch factors of approximately 2.3. An influence of graphite nodule diameter on the external notch effect is hardly recognized both in tension and fatigue. The graphite-notch factor in fatigue is almost 1.0 when a number of considerably fine graphite nodules and ferrite grains are dispersed, and it enlarges as the graphite nodule diameter increases. The relation between crack propagation rate (dl/dN) and stress intensity factor (K) is expressed as; dl/dN=CKm, where C and m are constants. The value of m enlarges as the graphite nodule diameter increases.抄録全体を表示PDF形式でダウンロード (688K) -
西辻 泰生1982 年 54 巻 7 号 p. 440-445
発行日: 1982/07/25
公開日: 2011/12/29
ジャーナル フリーFe-C-Si melts into which Al was added were statistically solidified at different cooling rates. Generation and distribution of AlN insoluble in 6N-HCl were examined by chemical analyses. AlN in the melt floats off more easily at lower cooling rate down to the completion of eutectic solidification. Most of the AlN forms in the liquid state. The amount of AlN depends on the cooling rate down to the completion of eutectic solidification. More of AlN forms at lower cooling rate.抄録全体を表示PDF形式でダウンロード (697K) -
久保 公雄, 佐藤 武, 大中 逸雄, 福迫 達一1982 年 54 巻 7 号 p. 446-453
発行日: 1982/07/25
公開日: 2011/12/29
ジャーナル フリーThe permeability of sand molds is expressed in the following equation applying Kozeny Carman's equation of packed bed.
P=12ε3⁄(1-ε)2Sv2μ
where ε and μ are void fraction of sand mold and viscosity of air. Sv is surface area per unit volume of mixture of sand and binder, and is expressed as:
Sv=6φs ⁄ Dp
where φs and Dp are shape factor of sand mold and diameter of sand particle. The shape factor varies from 0.7 to 1.7 and the value becomes smaller for round sand particles. For the same sand particle, the shape factor decreases in order of green sand mold, furan resin bonded sand mold and CO2 mold. The shape factor of CO2 mold is smallest, because the surface of the binder is smooth and the narrow space between sand particles decreases. The shape factor of green sand mold using sand of different sizes increases about 20%. Configuration of void differs from that using sand of single size.抄録全体を表示PDF形式でダウンロード (826K) -
三宅 秀和, 岡田 明, 尾崎 良平1982 年 54 巻 7 号 p. 454-459
発行日: 1982/07/25
公開日: 2011/12/29
ジャーナル フリーThe nucleation temperature and both the degree of nucleation and the growth morphology of the primary austenite (γ) in hypo-eutectic gray cast iron in Fe-C system were determined by accurate thermal analysis and from the primary γ structure revealed by quenching at the start of eutectic solidification. The degree of undercooling for nucleation increases and the degree of nucleation (the number of dendritic cells) decreases with an increase of cooling rate, degree of superheat or holding time. The solidification morphology of the primary γ tends to become exogenous and the growth rate increases with an increase of cooling rate, degree of superheat or holding time. When the primary γ solidifies endogenously, nucleation is easily to occur and numerous nuclei grow.抄録全体を表示PDF形式でダウンロード (882K)
技術報告
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渥美 猪三男, 牧口 直史1982 年 54 巻 7 号 p. 460-464
発行日: 1982/07/25
公開日: 2015/01/27
ジャーナル フリーPDF形式でダウンロード (2398K)
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