巻号一覧
19 巻, 4 号
選択された号の論文の15件中1～15を表示しています
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京谷 崋1955 年 19 巻 4 号 p. 255-258
発行日: 1955年
公開日: 2008/04/04
ジャーナル フリーIt has been reported that the mechanical properties of metals are improved by “KRK” process which consists of simultaneous action of heat applied for a few minutes or shorter and mechanical force.
The present paper deals with the effects of KRK process on the recrystallization of low carbon steel. Tests were made on 75% cold-worked specimens. The temperature for recrystallization was determined by the change in hardness and tensile strength. The results obtained are as follows: The temperature for recrystallization moves at lower and higher temperatures than is predicted from static tests, as according to the magnitude of force in KRK treatment. On heating the specimens subjected to KRK treatment at higher temperature than the recrystallization temperature, remarkable recrystallization is evident at the temperature of KRK treatment. By this process, the rate of nucleation and growth did not particularly change.抄録全体を表示PDF形式でダウンロード (701K) -
雹 武人, 橋本 文雄1955 年 19 巻 4 号 p. 259-263
発行日: 1955年
公開日: 2008/04/04
ジャーナル フリーIn this paper, the influence of cold-working on nitriding given before nitriding by NH3 is reported. One of the present authors previously drew curves concerning the grain growth of carbon steel affected by cold-working, the temperature and the length of time of the annealing. Also in the case of nitriding of steel, if different degree of cold-working was given before nitriding and annealing was continued for various lengths of time, the hardness and the micro-structure of the specimens were also quite different as shown in Fig. 4. The variation of the hardness of the specimen along the section from the surface to the centre is shown in Fig. 7. When the length of time of the nitriding is short, the work-hardening effect still remains but in the case of nitriding of a specimen that has received high degree of cold-working, or a higher temperature than 540° and a longer length of time than 10 hrs were used, the work hardening effect is vanished. The cold-working has the effect to lower the hardness but increases the depth of the layer of the diffusion of N2. As a conclusion in a word, it seems that the strain of the material to be nitrided promotes the chemical reaction of the nitriding. The nitrided layer and the central part of the specimen are shown in photo. 4.抄録全体を表示PDF形式でダウンロード (1041K) -
安房 信輝1955 年 19 巻 4 号 p. 263-267
発行日: 1955年
公開日: 2008/04/04
ジャーナル フリーThe various changes of the copper anode in the passivation phenomenon due to such factors as concentration and temperature of the solution and we surface areas of the electrodes are observed in electroplating of copper cyanide. The passivation voltage is not so much affected by the temperature of the solution as in the case of acid solutions. The measure of ionization of the anode is found much larger in the solution of lower concentration than in that of higher one while higher passivation voltage is obtained in a solution of lower concentration. It is a control of bath voltage that will serve in perventing the electrolytic decomposition and the passivation of the anode in interrupting, the formation of the molecules of caustic soda, and, consequently, increasing the polish of the material that is made by electroplating in such a way. As a result of this experiment, it is made clear that the limitation of bath voltage should be kept under 2 volts for any of the solutions in electroplating with copper cyanide. For solutions of comparatively low concentration, it is recomended that the bath voltage is maintained between 1.8 volts and 2.0 volts and between 1.6 volts and 1.8 volts for solutions of high concentration. In addition, it is seen that these values of bath voltage correspond, approximately, to the decomposition voltage of the solution in the electroplating of copper cyanide.抄録全体を表示PDF形式でダウンロード (775K) -
安房 信輝1955 年 19 巻 4 号 p. 267-271
発行日: 1955年
公開日: 2008/04/04
ジャーナル フリーThe typical figure of an A-V curve for the solution of copper cyanide plating is shown, the character of whose tracing is that a passivation phenomenon regularly occurs twice through each experiment. The A-V curve, however, is not always constant since its tracings have a different path in accordance with slight changes of the various factors involved in the experiment. Among them, there is the matter of the velocity to increase the bath voltage, which influences the shape of an A-V curve to some extent. It can be observed by making a thorough investigation of passive films that no rigid films composed of some higher oxides are formed on the anode, so that either the formation or the peeling-off of the passive films is easy enough. The passive film formed on the anode is probably composed of either CuCN or CuO. One of the charcters of an A-V curve is a simultaneous expression for the amount of the anode dissolved by galvanizing and that of the metal deposited on the surface of the cathode. For copper cyanide plating, between 1.8 volts and 2.0 volts is the bath voltage at which the amount of the anode dissolved becomes equal to that of the metal deposited on the surface of the cathode.抄録全体を表示PDF形式でダウンロード (771K) -
吉永 弘, 南 茂夫, 藤田 茂1955 年 19 巻 4 号 p. 271-274
発行日: 1955年
公開日: 2008/04/04
ジャーナル フリーThe authors have been carrying out quantitative analysis of various metal and alloy samples by the quantometer. Sometimes fluctuations greater than the accuracy limit, determined by the photometric error of the quantometer and the reproducibility of the spark generator, were found in analyzed data. The fluctuations show obviously the influence of the nonhomogeneous distribution of elements in the sample. This paper shows the results on the nonhomogeneity of the followings: Fe in aluminum, Ti in steel and Mg in nodular iron. Moreover the results on Mn, Si and Ni in steel bars are shown in detail. From these experiments the authors emphasize the difference between the data in chemical and spectrochemical analysis.抄録全体を表示PDF形式でダウンロード (644K) -
辛島 誠一1955 年 19 巻 4 号 p. 275-278
発行日: 1955年
公開日: 2008/04/04
ジャーナル フリーOne of the two specimens cut from the same high purity aluminium single crystal was extended by means of a freely suspended lower grip, and the other by a constrained one. The behaviours exhibited in both deformations were examined in detail and the following differences were observed. The critical resolved shear stress and the yield stresses in later stage of deformation were a little higher, but the yield stresses in early stage rather a little lower in constrained extension Inhomogeneities such as deformation bands and striae shown by microscopic examinations were either more numerous or more distinct in specimens extended by constrained tests. And, it was ascertained that the net twisting of crystals occurred in the course of free extensions.抄録全体を表示PDF形式でダウンロード (937K) -
辛島 誠一1955 年 19 巻 4 号 p. 279-282
発行日: 1955年
公開日: 2008/04/04
ジャーナル フリーThe necessity of intervening regions consisting of edge and screw dislocations connecting two regions deformed in different degrees is discussed in view of crystal lattice rotations. It is made clear that a rotation of freely suspended grip is caused both by an apparent rotation of specimen surface and by a twisting of crystal, and also that the latter is due to the presence of such intermediate region. The fact that the twistings of crystals oriented near (111), and (100) poles of the stereographic triangle are generally large, and various differences observed by microscopic examinations in the specimens subjected to two forms of extension—free and const—rained—are explained by the same idea.抄録全体を表示PDF形式でダウンロード (666K) -
服部 喬, 村 外志夫1955 年 19 巻 4 号 p. 282-286
発行日: 1955年
公開日: 2008/04/04
ジャーナル フリーResidual stresses due to quenching of steel bars and tubes having circular cross section have been investigated theoretically and experimentally by several authors, but we can scarcely find any report on the residual stresses of rings. In this paper we propose an experimental method for measuring the residual stresses of a ring and report on some properties of them. The residual stresses of a ring σr and σθ are a sum of σr′, σθ′ of dislocation type, and σr″ , σθ″ of incompatibility type. For the formr
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\ oindentwhere a and b are the inner outer and radius of the ring and \fboxω is the Volterra’s dislocation angle which is made by a cut through a width of the ring. For the latter
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\ oindentwhere Δa means the increment of a when the outer surface of the ring has been ground by r. Using the above formulas the quenching stresses of bearing rings have been obtained from the experimental data \fboxω and Δa. The effects of shot blasting on the residual stresses have been investigated. We have obtained the follwing results. (1) The incompatibility type residual stress much exceeds the other. (2) The tangential stress σθ′, σθ″ is prominent compared with the radial stress σr′, σr″. The tangential stress σθ is a tension on the outer surface of the ring and has a tendency to change the sign by the shot blasting on the surface. And the stress distribution is unsymmetrical with respect to the median line of the width. (3) The measurement of micro hardness shows an increase of hardness of the surface by the shot blasting. It means the increase of micro stresses.抄録全体を表示PDF形式でダウンロード (608K) -
關口 春次, 稻垣 道夫1955 年 19 巻 4 号 p. 286-290
発行日: 1955年
公開日: 2008/04/04
ジャーナル フリーThe dimensional changes due to low temperature annealing of cold-worked low carbon steel bars occur in the same direction as the deformation due to working before annealing, but the dimensional changes of high carbon steel bars occur in the opposite direction to the deformation due to working before annealing. As the authors called the former “the same direction change of dimension due to annealing after plastic deformation”, they will call the later “the opposite direction change of dimension due to annealing after plastic deformation”. On the dimensional changes due to high temperature annealing of low carbon steel bar, th length decreases and the diameter increases after the annealing, regardless of working or non-working. But the dimensional changes due to high temperature annealing of cold-worked high carbon steel bar occur in the same direction as those due to the low temperature annealing and the percentages of dimensional changes are larger than those in the case of low temperature annealing.抄録全体を表示PDF形式でダウンロード (714K) -
關口 春次, 稻垣 道夫1955 年 19 巻 4 号 p. 290-293
発行日: 1955年
公開日: 2008/04/04
ジャーナル フリーIf carbon steel bars are heated above the Al transformation point and cooled, their dimensions at room temperature change. The dimensional changes in the case of air cooling are similar with that in the case of furnace cooling. The carbon content of steel bars has effect on the percentage and the direction of dimensional changes.Such dimensional changes are enlarged by the repetition of heating above transformation point and cooling, while they become smaller in some measure with the increase of the holding time at a temperature above the transformation point.抄録全体を表示PDF形式でダウンロード (660K) -
丹 貴知藏, 下地 光雄, 門 智, 渡邊 芳彦1955 年 19 巻 4 号 p. 294-296
発行日: 1955年
公開日: 2008/04/04
ジャーナル フリーThe diffusion coefficients of bismuth in molten lead-bismuth system have been measured under the following two diffenent conditions. Firstly, the temperature range from 450° to 600° was adopted with comparatively dilute solutions permitting the use of the table of Gauss’ error integral. Secondly, the influence of the concentration on the diffusion coefficient was investigated at 500°. The result of the former is compiled as follows:
D=0.00096exp(−4,200⁄RT) cm2/sec. This figure confirms that the substance of diffusion in molten metals is the metal ions as described in the previous author’s paper. The calcu lated value by means of Stokes-Einstein equation in dilute solution at 500° agrees only with the order of the experimental value. The result of the latter shows that the diffusion coefficient in molten lead-bismuth system has a maximum at about atomic fraction of 0.6 of bismuth. This fact agrees with thermodynamic property of this solution which has a strong negative deviation from the Raoult’s law.抄録全体を表示PDF形式でダウンロード (426K) -
丹 貴知藏, 下地 光雄, 門 智, 渡邊 芳彦1955 年 19 巻 4 号 p. 296-299
発行日: 1955年
公開日: 2008/04/04
ジャーナル フリーDiffusion coefficients of antimony in molten lead have been measured at the same temperature range (from 450° to 600°) as in the previous investigations. Since the concentration of antimony is chosen at a comparatively dilution in the present investigation, the diffusion coefficients have been estimated as constants independent of the concentration. Thus,
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\ oindenthas been obtained. This result shows that it is the cations of antimony that diffuse in molten lead-antimony solution, because the activation energy of diffusion is of the same order as in lead-tin and lead-bismuth solutions. According to our experimental results, it has been shown that metal cations diffuse in molten alloys, because the free volume of metallic solution has been estimated as larger than the valus calculated in accordance with the usual equilibrium theory. In other words, if the diffusing substances are assumed to be such a small particles as a meta ion, the theoretical value of diffusion coefficient, which is calculated by using the atomistic theory of diffusion based upon the intuitive free volume model in liquid, should be of the same order as that obtained in our experimental results.抄録全体を表示PDF形式でダウンロード (422K) -
丹 貴知藏, 下地 光雄, 門 智, 渡邊 芳彦, 霎 敏雄1955 年 19 巻 4 号 p. 299-302
発行日: 1955年
公開日: 2008/04/04
ジャーナル フリーDiffusion coefficients of tin and bismuth in molten tin-bismuth system have been measured over the temperature range from 450° to 600° at comparatively low concentration of diffusate; then, the diffusion coefficients have been estimated as constants independent of concentration. Thus DBi=0.0013exp(−5,000⁄RT) and DSn=0.00052exp(−3,200⁄RT) have been obtained. These results show that it is not the stoms but the cations of diffusate that diffuse in tin-bismuth solution, because the activation energy of diffusion is of the same order as in non-metallic solution in spite of the great discrepancy between their energies of vaporization. The theoretical values of diffusion coefficients which are calculated roughly by Stokes-Einstein’s equation are in good agreement with the experimental results. Subsequently, the dependency of the diffusion coefficient of this system on the concentration has been measured at 500°, using Boltzman’s method, with respect to many sorts of samples. It has been shown that the diffusion coefficient changes almost linearly with concentration. Moreover, the product of diffusion coefficient D, and viscosity η, of this system varies linearly with concentration of bismuth. This is in agreement with the fact that thermodynamically the tin-bismuth system has ideal behaviours.抄録全体を表示PDF形式でダウンロード (524K) -
木島 茂1955 年 19 巻 4 号 p. A57-A62
発行日: 1955/04/20
公開日: 2008/11/11
ジャーナル フリーPDF形式でダウンロード (698K) -
大日方 一司, 竹内 庸1955 年 19 巻 4 号 p. A63-A68
発行日: 1955/04/20
公開日: 2008/11/11
ジャーナル フリーPDF形式でダウンロード (727K)
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