巻号一覧
33 巻, 3 号
選択された号の論文の26件中1～26を表示しています
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竹内 栄, 鈴木 謙爾1969 年 33 巻 3 号 p. 279-284
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe magnetic susceptibilities were measured as a function of oxygen concentration and of temperature for the NaCl-type TiO phase. The TiO phase was found to have the small paramagnetic susceptibility with a very weak positive temperature coefficient. The main part contributing to the observed susceptibility is the Pauli spin-paramagnetism due to the 3d-conduction electron. It was estimated from the measurement of susceptibilities that the Fermi level of the TiO phase was located at the concave position in the density of states∼energy curve. In connection with the peculiar defect structure of the NaCl-type TiO phase, one might regard the presence of the “impurity band” due to the electrons fallen in the oxygen vacancies from the 3d-conduction band as the feature of the electronic band structure of this phase. From such a point of view, it is preferably considered that the concave position in the density of states∼energy curve would be formed by the overlapping of the bottom of the 3d-conduction band with the top of the “impurity band”, but the conclusive result must be obtained from the measurements of Hall coefficients and electrical resistivities.抄録全体を表示PDF形式でダウンロード (1851K) -
竹内 栄, 鈴木 謙爾1969 年 33 巻 3 号 p. 284-290
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe electrical resistivities and Hall coefficients were measured as a function of temperature and of oxygen concentration for the NaCl-type TiO phase. The main part of the observed resistivity is a residual resistivity and the temperature dependent part is a little. The temperature coefficient of resistivity on the stoichiomtric TiO phase was found to be positive, but those for the nonstoichiometric TiO phase negative. The residual resistivity has a minimum value near the stoichiometric composition. The Hall coefficient has the positive value with a considerable temperature dependence in the composition range from excess titanium to near the stoichiometry, but the temperature independent negative value in the range of oxygen rich composition. In connection with the peculiar defect structure of the NaCl-type TiO phase, the special features of the electronic band structure of the TiO phase would be attributed to the presence of the “impurity band” formed by the electrons fallen in the oxygen vacancies from the 3d-band. On the basis of the above point of view, it may be deduced from the measurement of Hall coefficients that the Fermi levels of the TiO phase with titanium-rich or near-stoichiometric compositions are located in the overlapping region of the 3d-band and the “impurity band”, and that those of oxygen-rich compositions exist merely in the 3d-band. The results of electrical resistivity measurements, like those of magnetic susceptibility measurements, indicate that the Fermi levels are located at the concave position in the density of states∼energy curve. Therefore, it is very difficult to conclude that this concave region in the density of states∼energy curve is formed from the overlapping of the 3d-band with the “impurity band”, and a more reasonable conclusion must be that this concave region exists in the original 3d-band.抄録全体を表示PDF形式でダウンロード (2234K) -
美馬 源次郎, 山口 正治, 盛田 慎一, 高橋 純造1969 年 33 巻 3 号 p. 291-294
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーIn order to provide additional information to the reduction mechanism, the formation process of the sponge iron has been studied by means of the X-ray diffraction technique. In the X-ray diffraction study, the separation of the peak for iron crystals from the background is obscure in the early stage of reduction, and as the reduction proceeds, the separation gradually becomes clear. This can be explained in terms of the defective structure of iron crystals; that is, in the early stages of reduction the iron crystals contains lattice defects which decrease as reduction proceeds.
The lattice parameter of iron crystals determined by the extrapolation method decreases linearly with increasing reduction time, and it coincides with that of pure iron produced by reduction for 17 hour at 900°C.抄録全体を表示PDF形式でダウンロード (1283K) -
美馬 源次郎, 山根 寿巳, 岡崎 卓1969 年 33 巻 3 号 p. 295-299
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーTo clarify the fatigue process of a Al-2%Mg alloy which has a linear S-N relation and a fatigue limit, transmission electron microscope observations were made on the specimens bend-fatigued at constant strain amplitude by a Schenk type fatigue machine, changing the strain amplitude and the number of the strain cycle.
Main experimental results obtained are as follows:
(1) Rohmbic shape arrangements of dislocations were seen in a specimen fatigued with one cycle at a small strain amplitude of ±0.8×10−3 where fatigue fracture did not occur. Subgrains were observed after fatigued with 100 cycles and long subgrains which grew a special direction, were observed after fatigued with more than 100 cycles.
(2) The cell structures formed by tangled dislocations, were observed after fatigued with one cycle at a high strain amplitude of ±1.7×10−3, and subgrains were seen after fatigued with 100 cycles.抄録全体を表示PDF形式でダウンロード (1442K) -
小野 清雄, 郡司 好喜, 荒木 透1969 年 33 巻 3 号 p. 299-304
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーIn order to determine the surface tension of molten binary CaO-SiO2 slag, surface tension measurements on synthetic slags have been made by the maximum bubble pressure method using argon or oxygen as the bubble forming gas. During the experiment, the rate of bubble formation has been kept constant at the rate of one bubble every 60 sec. The results obtained are as follows:
(1) The surface tension of a series of compositions ranging from 43.8 to 63.2 molar % of SiO2 in the temperature range from 1475° to 1600°C is determined.
(2) The surface tension of the slag decreases as the content of SiO2 increases, and this tendency is more marked in the case of using argon as the bubble forming gas than the case of oxygen.
(3) In the case of argon, the temperature coefficient of the surface tension is negative, but it becomes positive in the case of oxygen.抄録全体を表示PDF形式でダウンロード (1728K) -
菊池 武昭, 黒沢 利夫, 柳橋 哲夫1969 年 33 巻 3 号 p. 305-309
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe kinetics of a fundamental reaction of the aluminium subhalide process, 2Al(l)+AlCl3(g)=3AlCl(g), were determined by the flow method under a reduced pressure of trichloride at 900°∼1100°C.
The reaction rate increased with the increment in the flow rate of trichloride, namely its pressure.
As a result of the present experiment, the reaction rate was expressed by the following equation:
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The apparent activation energy of this reaction was 11.8 kcal/mol.
The reaction ratio of AlCl3 increased with the rising temperature and lowering trichloride pressure.抄録全体を表示PDF形式でダウンロード (1404K) -
大山 致知, 渡辺 貞夫, 寺嶋 俊光, 田中 英八郎1969 年 33 巻 3 号 p. 309-313
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーIn order to elucidate the interaction of tool and specimen interface under superimposed ultrasonic vibration, the hardness distribution, decreased stress level and frictional condition were studied as a function of the vibrational mode. The results obtained are summarized as follows: (1) Work hardening of the specimen deformed with the superimposed high amplitude vibration is lowered remarkably. Compared with the specimen core, a low hardness of the surface region is generally observed. (2) The difference in the decrease of compressive stress between the positions of the node and the loop is not observed. (3) The friction of tool and specimen interface is varied during vibrational compression. The friction coefficient is also increased remarkably in bulk deformation. These are chiefly due to sticking of the specimen to the tool.抄録全体を表示PDF形式でダウンロード (936K) -
柳原 正, 小林 剛1969 年 33 巻 3 号 p. 314-317
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーIn order to observe the binding state of Fe++ in Fayalite, the process of the reduction of Fayalite with hydrogen has been studied. The process of the hydrogen reduction was pursued with X-ray diffraction and infra-red absorption techniques. The products of the hydrogen reduction of Fayalite were Fe, SiO2 and H2O. On account of the high reduction temperature, H2O escaped out of the system. The Fe atoms which were congregated in the holes of the SiO2 crystals formed the Fe crystals. From the infra-red absorption curves of SiO2 and Fayalite and the changes of the infra-red absorption curves during the hydrogen reduction of Fayalite, the following points were made clear. From the beginning of the hydrogen reduction process, i.e. the Si-O-Fe-O-Si binding of Fayalite, changes to the Si-O-Si binding of SiO2 and the absorption having a maximum at 1098 cm−1 appears. With the advance of the hydrogen reduction process, the intensity of this absorption increased. Accordingly, the vibration of the Si-O-Si binding of SiO2 causes the absorption with a maximum at 1098 cm−1. The infra-red absorption of Fayalite having a maximum at 830 cm−1 shifts to the absorption of SiO2 with a maximum at 797 cm−1 with increasing hydrogen reduction. It may be assumed that the O-Si-O binding of SiO2 causes the absorption of SiO2 with a maximum at 797 cm−1, and the existence of Fe++ brings about the absorption of Fayalite with a maximum at 830 cm−1.
The absorption of Fayalite having a maximum at 950 cm−1 disappears earlier than the absorption of Fayalite having a maximum at 870 cm−1. The SiO2 produced by hydrogen reduction shows no X-ray diffraction pattern.抄録全体を表示PDF形式でダウンロード (853K) -
矢沢 彬, 李 容根1969 年 33 巻 3 号 p. 318-323
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーIn order to clarify thermodynamic properties of the molten aluminum-indium alloy system, the values of electromotive force for the following reversible galvanic cell have been determined in the temperature range 700° to 950°C.
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The activities derived show considerable positive deviations from Raoult’s law as expected from the phase diagram. The experimental results agree with the activities estimated from the liquidus line, or those derived from Lumsden’s model. The activity coefficients at infinite dilution were determined at 700°C to be 11.4 and 13.2 for aluminum and indium, respectively. Limits of the miscibility gap and the location of critical point which had involved uncertainty were confirmed with the observed lines of electromotive force. Various partial and integral thermodynamic quantities were derived from experimental data, and it was found that the heats of mixing obtained were in good agreement with those determined directly with calorimeter by Wittig. Furthermore, the interaction energy and the short-range order in this liquid alloy have been evaluated by the aid of the theory of quasichemical approach, and the results obtained show reasonable agreements with those derived by the classical thermodynamic method.抄録全体を表示PDF形式でダウンロード (1646K) -
李 容根, 矢沢 彬1969 年 33 巻 3 号 p. 323-328
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーUsing the same method as in a previous study for molten aluminum-indium alloys, the measurement of emf of the cells
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\ oindentfor molten aluminum-tin and aluminum-gallium alloys has been carried out. In the molten Al-Sn system, the activities obtained show considerable positive deviations from Raoult’s law and agree well with those estimated from the liquidus line. On the other hand, the activities derived for the molten Al-Ga system obey Raoult’s law fairly well. The activity coefficients determined at infinite dilution are 4.05 for aluminum and 7.11 for tin in the aluminum-tin system at 800°C, and those in the aluminum-gallium system at 700°C are 1.15 and 1.27 for aluminum and gallium, respectively. Other thermodynamic properties of both molten systems have then been derived from experimental data and the heats of mixing obtained are in good agreement with those determined directly with calorimeter by Wittig. The experimental results obtained agree fairly well with the values calculated with models based upon statistical thermodynamics in both aluminum-tin and aluminum-gallium systems. Furthermore, the interaction energy and the short-range order in both systems have been evaluated by the aid of the theory of quasichemical approach, and the results obtained show reasonable agreement with those derived by the classical thermodynamic method.抄録全体を表示PDF形式でダウンロード (1268K) -
鈴木 寿, 植木 光生, 川勝 一郎1969 年 33 巻 3 号 p. 328-334
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe purpose of this study was to obtain the material having an excellent spring property and high corrosion resistance. Mechanical properties of Cu-20%Ni alloys containing various amounts of Sn, Mn, Al and Si respectively, have mainly been investigated. These alloys were cast, homogenized, hot-worked and cold-worked to 0.5 mm thickness sheets and subsequently heat-treated at various temperatures for various times. The alloys containing a large amount of additions were solution-treated at 950°C before the final cold-reduction.
The results obtained were as follows:
(1) The spring and the other mechanical properties of Cu-20%Ni alloys with a small amount of additions were slightly improved with increasing amount of additions and the cold-reduction. This improvement was attributed to the low temperature annealing effect.
(2) The spring property of the alloys containing more than about 3%Sn, 10%Mn, 2%Al and 0.5%Si was sharply improved by precipitation hardening.
(3) The stress corrosion resistance of Cu-20%Ni alloy systems was lowered with increasing amount of additions, but it was much higher than the resistance of nickel-silver. The alloy with Mn showed the most excellent resistance.
(4) It was found that Cu-20%Ni alloy systems with more than about 5%Sn, 25%Mn or with 2∼3%Al were superior in the spring property and the corrosion resistance to commercially available nickel-silver.抄録全体を表示PDF形式でダウンロード (2306K) -
鈴木 寿, 北野 均, 菅野 幹宏1969 年 33 巻 3 号 p. 334-338
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーReversion phenomena in aged Cu-0.12%Zr-0.28%Cr alloy have been investigated by means of resistivity measurement and transmission electron microscopy, comparing with those of Cu-0.30%Zr and Cu-0.26%Cr alloys. Specimens in the form of a 0.5 mm sheet were solution-treated at 950°C for 1 hr, water-quenched, aged and finally reversed.
Main results obtained were as follows:
(1) The reversion phenomena were confirmed to exist in Cu-Zr and Cu-Zr-Cr alloys as well as Cu-Cr alloys, at aging temperatures between 300° and 500°C. The critical aging temperature for the reversion was not observed in all the alloys.
(2) The reversion behavior was commonly observed in each alloy: the greater the difference between aging and reversion temperatures, the larger the amount of reversion and the shorter the time to reach the maximum amount of reversion. Split aging increased the amount of reversion particularly in Cu-Zr and Cu-Zr-Cr alloys, compared with that by conventional aging. The amount of reversion in Cu-Zr-Cr alloy was greatly affected by the resolution of Cr precipitate formed by pre-aging.
(3) Structural changes in Cu-Zr-Cr alloy due to the reversion were hardly observed by transmission electron microscopy.
(4) The above results should be explained on the assumption that the size of the precipitate is below the critical size for growth at the reversion temperature.抄録全体を表示PDF形式でダウンロード (1477K) -
上城 太一, 西口 勝1969 年 33 巻 3 号 p. 339-344
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe stability of a (111)[\bar101] orientation at high reduction and the development of two partial ⟨110⟩ fiber textures were examined by rolling of α-iron strips having orientations (111)[\bar101], (111)[\bar1\bar12], (001)[010] and (011)[0\bar11]. A ⟨111⟩ fiber texture parallel to the normal direction, which is the main component of the rolling texture for the strips rolled up to 65 pct, changes into a partial fiber texture with a ⟨110⟩ axis inclined by 60° from the rolling direction at the reduction more than 80 pct. This corresponds to the decrease in the (111)[\bar101] orientation owing to the slip rotation toward a (121)[\bar101] orientation. A partial ⟨110⟩ fiber texture parallel to the rolling direction is observed in the strip rolled 90 pct and is developed remarkably at 98 pct reduction. The cause of retardation in the developement of this texture is considered to be due to the lack of crystals oriented in such a way that a ⟨110⟩ axis lies between the rolling direction and the operative slip direction.抄録全体を表示PDF形式でダウンロード (1420K) -
三谷 裕康, 永井 宏1969 年 33 巻 3 号 p. 344-348
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーOn utilizing the subhalide reaction to the aluminum refining process, it is very important to know the reactivity between crude aluminum alloys and aluminum trichloride. However, very little work has been reported concerning the influence of the alloying elements in crude aluminum alloys on this reaction.
In a previous work, the reactivity of AlCl3 with liquid Al-Si and Al-Fe binary alloys was investigated by the bubbling method, and at the same time the activities of Al in these alloys were determined.
In this report, the reactivity between AlCl3 and liquid Al-Cu binary alloys in the composition range 0<NCu<0.574 was investigated by the same method. Combining the equilibrium constant determined in the previous work with the experimental data on these alloys, the activities of Al and Cu were determined at 1200° and 1100°C. The activities of Al show a large negative deviation from Raoult’s law below 70 at%Al. The activity curve was found to be similar in shape to that obtained by Wilder, who determined the values by e. m. f. measurements using a molten chloride electlyte at 1100°C.
Moreover, from the reaction ratio and the flow rate of AlCl3 obtained in the present experiment, the relations among the transporting velocity of Al, the flow rate of AlCl3 and the composition of Cu were discussed.抄録全体を表示PDF形式でダウンロード (1546K) -
荒牧 透, 遠藤 孝雄, 圓城 敏男, 足立 正雄1969 年 33 巻 3 号 p. 349-354
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe effects of temperature and strain rate on the flow stress of Al-Mg alloys containing up to 3.5 at% magnesium have been studied in the temperature range from 300° to 600°C. The activation volume v satisfies the relationship, v∝σ−1, where σ is the stress at which the rate change was made. The magnitude of the activation volume is of the order of 10−19 cm3 to 10−21 cm3. The temperature dependence of the activation volume for a constant base-strain rate is given by v∝exp(−Q⁄kT), where Q is the activation energy which depends on the base-strain rate and solute concentration. The activation energy for creep determined by a minimum creep rate method is found to be 1.44 eV. The results are interpreted on the basis that the thermally activated process is controlled by a non-conservative motion of jogs in screw dislocations.抄録全体を表示PDF形式でダウンロード (2361K) -
天野 嘉次, 三木 雅道1969 年 33 巻 3 号 p. 355-361
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe properties of aging and corrosion resistance of Cu-30∼60%Ni alloys containing 2.6∼2.7%Ti were studied.
The age hardening of these alloys took place by tempering above 500°C after solution treatment at 1050°C. It is seemed that such hardening is due to the precipitation of the finely dispersed non-equilibrium phase γ′(FCC Ni3Ti) which is transformed to an equilibrium phase η(HCP Ni3Ti) in the over-aging stage. Moreover, the denuded zone which is thought to be caused by the denudation of titanium atoms due to the precipitates at the grain boundary was observed at the grain boundary in the over-aging stage above 800°C.
When the Cu-30%Ni-2.6%Ti and Cu-45%Ni-2.7%Ti alloys were cold worked at room temperature, the martensitic transformation was observed. From the results of X-ray analysis and microscopic observation, it is deduced that the transformation is caused by displacement of atoms on the matrix FCC (111) plane which is parallel to the transformed Ni3Ti HCP(00.1) plane.
Next, the corrosion weight losses of these alloys, Cupro-nickel and Monel metal immersed into 20%HCl, 10%HNO3 and 10%H2SO4 solutions kept at 50°±1°C were measured. From the present experiment, it was made clear that the corrosion resistance of the alloys is slightly inferior to Monel metal but superior to Cupro-nickel.抄録全体を表示PDF形式でダウンロード (2500K) -
千田 晃, 田中 時昭1969 年 33 巻 3 号 p. 362-365
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe inter-diffusion coefficients \ ildeD in molten lead-antimony and lead-antimony-bismuth alloys have been measured by means of the diffusion couple method in the temperature range 400° to 700°C. Antimony distribution in the specimen was determined with an electron probe microanalyser. The results can be represented by the following equation:
(This article is not displayable. Please see full text pdf.)
Dependence of \ ildeD on concentrations of antimony was not found up to 0.0822 atomic fraction of antimony in the lead-antimony binary system. Influence of bismuth on \ ildeD in the lead-antimony-bismuth system was also negligible up to 0.1489 atomic fraction of bismuth within the limit of experimental error. The experimental results proved the validity of theoretical prediction that the inter-diffusion coefficients \ ildeD takes the values colse to the self-diffusion coefficient of lead DPb* under given conditions.抄録全体を表示PDF形式でダウンロード (1519K) -
永森 斡, 畠山 健, 亀田 満雄1969 年 33 巻 3 号 p. 366-370
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーThe present paper is a subsequent study of “Thermodynamics of pyrrhotite at the temperature range of 800°∼1100°C” by Nagamori and Kameda(1)(2). The activity-composition relations for the Fe-S melts were established at 1100°∼1300°C by using a gaseous mixture of H2S-H2. The activities of Fe (γ) and FeS(l), ΔGT° for the formation of FeS(l), the heat and the entropy of mixing were calculated from the experimental results.抄録全体を表示PDF形式でダウンロード (1358K) -
井垣 謙三, 野田 泰稔1969 年 33 巻 3 号 p. 371-375
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーSingle crystals with nominal composition CoSe1.05 were grown by the Bridgman method and heat-treated under the variously controlled selenium atmospheres. Heat-treated specimens were chemically analyzed by means of the colorimetric method, the crystal structures were studied by X-ray oscillation and Weissenberg photographs, electrical properties and magnetic susceptibilities were measured from the liquid air temperature to room temperature.
The reported γ-CoSe region of the Co-Se phase diagram is found to be not of a single phase region but composed of a three-phase regions. Specimens of the composition CoSe1.03, treated under lower selenium pressure, have the fundamental NiAs type structure. After the treatment under a higher selenium pressure, two different types of superstructures were observed; the dimensions of orthohexagonal unit cells are A=\sqrt3B, B=2a, C=3c for the composition CoSe1.13 and A=\sqrt3B, B=2a, C=2c for the composition CoSe1.30. The melting points were measured under various selenium pressures and the P-T phase diagram was made out.
All specimens show the n type conduction and the electrical resistivity at room temperature was of the order of 10−4 Ω·cm. The temperature dependence of resistivity was metallic from the liquid air to room temperature. The resistivity increased with increasing selenium pressure on treatment. The magnetic susceptibility was slightly temperature dependent and the slope of the 1⁄χ-T curve increased a little with increasing selenium pressure on treatment.抄録全体を表示PDF形式でダウンロード (1581K) -
藤森 啓安, 斎藤 英夫1969 年 33 巻 3 号 p. 375-379
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーTo make clear the mechanism of the appearance of large spontaneous volume magnetostriction of fcc (Fe1−xCox)0.89Cr0.11 alloys, their magnetization and electrical resistivity were measured and the following results were obtained:
(1) The dependences of the mean magnetic moments and the Curie temperature on the concentration, x and the outer electron concentration, n in the alloys were just similar to those in Fe-Ni and Fe-Pd invar type alloy systems. That is, the alloys in these three systems are ferromagnetic in the Co-and Ni-rich sides and their ferromagnetic moments disappeared at the n of about 8.2∼8.4 which corresponds to the concentration containing Fe more than it in invar type alloys.
(2) The mangetization-temperature curve of the invar type alloys mentioned above did not follow the Brillouin’s function.
(3) The electrical resistivity-temperature curve of the invar type alloys showed an anomalous broad maximum near the Curie temperature. And the residual resistivity were very large. These phenomena may be explained on the assumption of the co-exsistence of ferromagnetic and antiferromagnetic states. It may be considered that the co-exsistence of two magnetic states is closely connected with the sharp drop of the ferromagnetic moments near the concentration of invar type alloys.抄録全体を表示PDF形式でダウンロード (1734K) -
日下 邦男, 鶴見 州宏1969 年 33 巻 3 号 p. 380-385
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーSome experiments were carried out by means of crucible tests, metallographic and X-ray diffraction techniques in order to make clear the effect of alloying elements on the vanadium pentoxide attack in 20%Cr-10%Ni heat resisting steels. The experiments were mainly conducted at 900°C for 1 hr using V2O5-10%Na2SO4 and V2O5-20%Na2SO4. The results obtained are summarized as follows:
(1) The alloying elements which improve the corrosion resistance are Cr, Si, P, As, Al, Ni, Y and Be.
(2) The alloying elements which decrease the corrosion resistance are Mo, Nb, V, Cu, W, Co and B.
(3) Mn, C and Ti have an inconsiderable effect on the corrosion resistance.
(4) Silicon has a favorable influence at high temperatures, but it has a considerably less favorable influence at 700°C.抄録全体を表示PDF形式でダウンロード (1732K) -
加藤 春男, 田中 英八郎1969 年 33 巻 3 号 p. 385-391
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーIn order to clarify the cold rolling textures of ultra-thin sheets of 50%Ni-Fe alloy, the effects of extremely high reduction and thickness on the textures and the variation of textures through the thickness have been investigated. It has been recognized that the rolling texture of this alloy is of the copper type. However, under the above extreme condition, the alloy shows a peculiar textures. The results obtained are summarized as follows:
(1) Center textures up to 99.4% reduction and thicker sheets than 20 μ in thickness show a sharp copper type.
(2) After the reduction higher than 99.4% {110}⟨112⟩ decreases and {112}⟨111⟩ increases and such a tendency is more remarkable in the thinner sheets and the surface layer.
(3) After the reduction higher than 99.9%, weak {110}⟨335⟩ and {110}⟨100⟩ increase slowly with increase in reduction and is stronger in the surface layer.
(4) Very weak {100}⟨001⟩ component exists in the deformed matrix but after the reduction higher than 99.4%, this component decreases. The integrated intensity of {100}⟨001⟩ in the deformed matrix corresponds to the number of {100}⟨001⟩ recrystallization nuclei.抄録全体を表示PDF形式でダウンロード (1294K) -
志村 宗昭, 篠原 義広, 和泉 修1969 年 33 巻 3 号 p. 391-396
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーA study by optical and electron microscopy has been made of crack propagation at room temperature in pure α-titanium. The rate of crack growth is large in the early stage and then decreases, and afterwards increases radically to failure. According to analysis by the Frost-Dugdale method which assumes that the rate of crack propagation is proportional to one power of crack length, there is a linear relationship between the logarithm of crack length and the number of cycles in the intermediate stage of crack growth. The relation between the slope of the line and the strain amplitude is linear. This suggests that the strain amplitude dependency of the rate of crack growth does not change over a wide range of strain amplitude in pure α-titanium. According to analysis by the Master curve method which assumes that the rate of crack propagation is an exponential function of the stress intensity factor at the crack tip, the growth process is divided clearly into two stages. The second stage is mostly expressed as a band and the slope of the band is slightly less than five and is a little larger than that in the case of aluminium alloys and steels. In the first stage, the dependency of the rate of crack growth on the strain intensity factor is vice versa. The crack length in the first stage is very small, but the proportion of the first stage in the total fatigue life is about 30 percent. The results of the observation on the structural change in the vicinity of the crack tip and the fracture surface show that the process of the crack propagation is not always continuous and also includes the formation of micro cracks ahead of the main crack tip and the process of connecting the main crack with the isolated cracks.抄録全体を表示PDF形式でダウンロード (1436K) -
田中 良平, 藤平 昭男, 湊 理宙1969 年 33 巻 3 号 p. 397-402
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーIn order to obtain fundamental information on the characteristics in heat-treatment of graphitized structural low alloy steels, the effects of graphite size, austenitization temperature and additions of Ni and Cu on the behavior of austenitization of the graphitized steels were studied. The degree of austenitization was measured over a temperature range of 800°∼1000°C by means of the hardness test after water quenching.
The main results obtained were as follows:
(1) Time-temperature-austenitization diagrams of the graphitized steels shifted to the longer time side than those of normalized steels. For example, at 950°C, the graphitized steels required 2∼5 sec to start austenitization and 20∼2000 sec to finish, whereas the normalized steel 3∼5 sec to start and 7∼10 sec to finish.
(2) At a lower temperature (800°C or 850°C), the graphitized steels, especially one containing coarse graphite particles, showed a different austenitization behavior that proceeds in two stages.
(3) The steels of fine graphite particles were austenitized more quickly than those of coarse graphite.
(4) The graphite size affects the behavior of austenite nucleation, so that in the steels of coarse graphite particles, the austenite nucleates on the ferrite-graphite interface and on ferritegrain boundaries in the steels of fine graphite particles.
(5) Although the effects of additional elements were rather obscure, a small amount of Cu and Ni seemed to change the effects of the graphite size.抄録全体を表示PDF形式でダウンロード (2552K) -
神森 大彦, 田口 勇, 小野 昭紘1969 年 33 巻 3 号 p. 403-407
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリーA method was developed for measuring the potential-current curve of small amounts of carbide residues extracted from steel. The curve is necessary for selecting a suitable electrolytic potential when a potentiostatic electrolysis method is applied for the quantitative extraction of carbide from steel.
About 20 mg of dried carbide residues are mixed with about 100 mg of carbon electric conductive paint and the mixture is painted on a platinum plate (55×25×0.2 mm). The plate is suspended as the anode in electrolyte. Carbide residues begin to be electrolyzed by potentiostat and the electrolytic potential is varied at a speed of 10 mV/min. The potential and the current are automatically recorded.
The proposed method was about ten times as sensitive as the pressed graphite method which was previously reported by one of the present authors. The procedure for the measurement was simpler and the time was shorter.
Potential-current curves of commercial synthetic carbides and vanadium carbide extracted from steels were measured.抄録全体を表示PDF形式でダウンロード (1843K) -
1969 年 33 巻 3 号 p. 407
発行日: 1969年
公開日: 2008/04/04
ジャーナル フリー
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