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51 巻, 7 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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津田 昌利, 小林 武, 笠 一也, 上治 豊1979 年 51 巻 7 号 p. 383-388
発行日: 1979/07/25
公開日: 2012/06/02
ジャーナル フリーIn became clear in the preceding reports that para-toluen sulfonic acid which have been used as hardening catalyser on the furan resin mold release several types of sulfur system gases by thermal decomposition. An abnormal structure is formed on the interface of castings by interface reaction between sulfur system gases and spheroidal graphite cast iron melts. This is a paper on the abnormal structure studied from the behavior of magnesium, sulfur and manganese on the interface of castings. It was found that there is a remarkable concentration of residual magnesium, sulfur and manganese in the neighborhood of the interface where the abnormal structures appear. Magnesium and manganese in the melts react with sulfur in the pyrolytic gases of the furan mold until solidification completes on the surface layers of castings. Therefore, magnesium sulfides and manganese sulfides were formed, both of which were concentrated in the neighborhood of the interface of castings. The effective magnesium contents for graphite spheroidization decrease with the reaction on the interface of the casting and mold, and form abnormal structures on the interface.抄録全体を表示PDF形式でダウンロード (896K) -
西 成基, 小林 俊郎, 近藤 雅博1979 年 51 巻 7 号 p. 389-394
発行日: 1979/07/25
公開日: 2012/06/02
ジャーナル フリーTo improve the toughness of 13%Cr cast steel by heat treatment, low temperature quenching treatment from the (α + γ) transformation range in the intermediate stage between usual quenching and tempering was applied and studied in detail. It is shown that improved toughness and lower transition temperature are obtained by this treatment and that the toughness is not influenced very much by the cooling rate after this treatment. It is also shown that this treatment is most effective in lower Ni content steel improving temper embrittlement and extending the favorable tempering temperature range.抄録全体を表示PDF形式でダウンロード (730K) -
千々岩 健児, 林 守仁1979 年 51 巻 7 号 p. 395-400
発行日: 1979/07/25
公開日: 2012/06/02
ジャーナル フリーTo examine the influence of strain rate and temperature on the ultimate strength and elongation of ductile cast iron, tensile tests were carried from room temperature to liquidus at strain rates which varied from 10−4 to 10−1 per sec. The ultimate tensile strength from room temperature to liquidus can be divided into 5 ranges according to temperature : (i) high strength range, room temperature to about 400°C ; (ii) rapid falling strength range, about 400°C to α→γ transformation start point ; (iii) transition strength range, eutectoid transformation range ; (iv) trans-cellular fracture strength range, α→γ transformation finish point to about 1,100°C ; and (v) inter-cellular fracture strength range, about 1,100°C to liquidus temperature. Generally, the elongation increases with increasing temperature, but brittle behaviors and small elongation are observed 5 times : at 180°C, 400°C, eutectoid transformation range, 1,000°C and above 1,120°C. The maximum true stress in the (ii) range in ferrite and pearlite-ferritic ductile irons is greatly influenced by the rate of strain. The deformation behavior in the austenitic matrix range is dominated by a thermally activated process.抄録全体を表示PDF形式でダウンロード (710K) -
中野 幸紀, 川野 豊1979 年 51 巻 7 号 p. 401-407
発行日: 1979/07/25
公開日: 2012/06/02
ジャーナル フリーThe magnetic properties of cast irons having nodular to flake graphite morphology were investigated. The relation of the principal magnetic components composed of residual induction ratio Br/Bm, coercive force Hc, initial permiability μa, differencial permeability dB/dH and induction Bm in the magnetic field of 400 Oe to distribution, size and shape of graphite was examined. The principal component Z=5.5 (Br/Bm)+0.005Hc+0.12μa−0.28 (dB/dH)+0.40Bm−6.8 was found to increase in the following order : C-type graphite, mesh (Widmannstätten) graphite, A-, D-, E-type graphite, vermicular and nodular type graphite. In terms of the proper magnetic parameters of cast irons, dB/dH and Bm have a significant relation to morphology of graphite.抄録全体を表示PDF形式でダウンロード (824K) -
神尾 彰彦, 手塚 裕康, 熊野 正彦, 高橋 恒夫1979 年 51 巻 7 号 p. 408-413
発行日: 1979/07/25
公開日: 2012/06/02
ジャーナル フリーMechanical properties of permanent mold castings were examined in Al-5.5%Mg and Al-4%Cu-4.5%Si alloys containing Ti up to 0.2%. Ultimate and 0.2% proof strengths and elongation of the former are raised appreciably by Ti content up to 0.1% and then moderately by Ti up to 0.2%. An appreciable advance in mechanical properties can not be expected in the latter. Change in mechanical properties of both alloys with Ti content is not so corresponding to the grain refining effect of Ti. Despite the considerable grain refinement in the alloy containing 0.2%Ti, mechanical properties are not so improved. This is attributed to the fact that increase in Ti content changes the dendritic shape of the α-phase to petal-like shape and increases the dendrite cell size, and the distribution of the eutectic phase and crystallized compounds becomes rough. The Al-Cu-Si alloy in which a lot of needle-like eutectic Si and intermetallic compounds crystallize is insusceptible in mechanical properties to the Ti grain refining.抄録全体を表示PDF形式でダウンロード (669K) -
池田 実, 竹内 宏昌, 梅田 高照, 木村 康夫1979 年 51 巻 7 号 p. 414-418
発行日: 1979/07/25
公開日: 2012/06/02
ジャーナル フリーRelation between solidification conditions and solidification structures and solute distribution is examined by quenching the nickel-aluminum bronzes during unidirectional solidification. Equiaxed structures form as the liquid temperature gradient becomes lower and solidification rate larger. Formation of equiaxed structures is due to the presence of constitutional supercooling. Secondary dendrite arm spacing d is represented as : d=c·θn, where c is constant, θ is time spent from the passage of the solid-liquid interface prior to quench, and n is constant and approximately 0.3 when the solidification rate is low. Equilibrium distribution coefficients for Al, Fe, Ni and Mn are 1.13, 2.50, 1.51 and 0.57, respectively.抄録全体を表示PDF形式でダウンロード (707K)
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