巻号一覧
23 巻, 9 号
選択された号の論文の16件中1～16を表示しています
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福元 一郎1959 年 23 巻 9 号 p. 499-503
発行日: 1959年
公開日: 2008/04/04
ジャーナル フリーCompression tests were performed on as-cast and heat-treated specimens of the alloys Nos. 1∼12 in report No. 6. The summarized results were as follows: (1) As the hardness of primary crystal increased, the yielding stress increased from 30 to 140 kg/mm2, but was not affected so much by C% of alloys. (2) At about constant strain of 1%, the compressive stress increased almost in proportion to the hardness of the specimens, but at 0.3% strain the compressive stress varied markedly for the specimens having the same hardness. The factors causing this variation seemed to be the S, C contents, the melting and the casting conditions and the heat-treatment of the alloys. (3) The specimens having hardness of above 60HRC fractured vertically or were crushed to pieces, at about 1% strain and the stress of about 320 kg/mm2. On the other hand, the specimens below about 55HRC fractured on the plane about 45° to the compressed axes, at the stress of 160∼280 kg/mm2 and about 3∼30% strain.抄録全体を表示PDF形式でダウンロード (847K) -
真野 育三1959 年 23 巻 9 号 p. 503-505
発行日: 1959年
公開日: 2008/04/04
ジャーナル フリーIn order to clarify the effects of surface roughness of grit-blasted base metal and time of exposure to air after blasting on the adherence of sprayed zinc coatings to the base metal, the bent angle of steel sheet specimens which have two notches was measured by a bending tester as specified in JIS. The following results were obtained: (1) There is a linear relation between the adherence of sprayed coatings and surface roughness of base metals. The coarsely blasted surface has higher strength of adhesion than the finely blasted surface. (2) The adherence-exposure time curve is approximately represented by a parabolic curve, therefore, the strength of adhesion decreases rapidly at the initial period of exposure. It is desirable to apply spray coatings within 150 minutes after blasting in order to ensure good adhesion. (3) When fine blasting is applied, the influence of exposure time is not remarkable, but when coarse blasting is applied, the influence is evident.抄録全体を表示PDF形式でダウンロード (358K) -
菅野 猛, 粟谷 丈夫, 吉川 明静1959 年 23 巻 9 号 p. 505-507
発行日: 1959年
公開日: 2008/04/04
ジャーナル フリーThe method of the use of ultrasonic vibration for quick results in fatigue tests has been developed. The authors built the apparatus by using a nickel magnetostriction transducer operated at 18.6 kC/s and an exponential horn as a focusing device. It causes the stress amplitude of 30 kg/mm2 in a mild steel rod of 3.8 mm dia. This is the report on the characteristics of fatigue testing by this apparatus.抄録全体を表示PDF形式でダウンロード (506K) -
網谷 俊男1959 年 23 巻 9 号 p. 508-511
発行日: 1959年
公開日: 2008/04/04
ジャーナル フリーExperiments were carried out on the effect of very small quantities of cadmium on the aging characteristics of aluminium-1.6% magnesium silicide alloys. A small quantity of cadmium has a definite influence on the course of aging. The natural aging is depressed, but the rate of artificial aging is accelerated by addition of cadmium. It is also found that small addition of cadmium of the order of 0.2 wt% exerted a marked effect on the mechanical properties of a commercial-purity aluminium-1.6% magnesium silicide alloy (61S type). At the same time it is found that by small addition of cadmium, the split aging effect and the retrogression disappeared.抄録全体を表示PDF形式でダウンロード (592K) -
西岡 多三郎, 安国 幸雄1959 年 23 巻 9 号 p. 511-515
発行日: 1959年
公開日: 2008/04/04
ジャーナル フリーIn diesem Bericht wurde der Einfluss der raschen Erhitzung beim Wärmebehandeln sowie der geringen Zugabnahme, Rundheit des Ziehloches, Ziehrichtung und Ziehgeschwindigkeit beim Ziehen auf die Härteverteilungen der Stahldrähten untersucht. Der beim Wärmebehandeln rasch erhitzte Draht hat keinen grossen Unterschied in mittlerer Härte in Vergleich mit dem gewöhnlich erhitzten Draht und ist ungleicher in der Verteilung der Härte, nämlich niedriger in Kern, höher in Rand. Der mit günstiger geringer Zugabnahme gezogene Stahldraht hat sehr gleichmässige Härteverteilung. Hinsichtlich des Einflusses der Rundheit des Ziehloches hat der abwechselnd mit rundem und elliptischem Ziehloch gezogene Draht die gleichmässigere Härteverteilung als der ständig mit rundem Ziehloch gezogenen Draht. Die Ziehrichtung beeinflusst kaum die Härteverteilung. Die Härte des gezogenen Drahtes wird mit zunehmender Ziehgeschwindigkeit höher, besonders im Rand.抄録全体を表示PDF形式でダウンロード (828K) -
西岡 多三郎, 安国 幸雄1959 年 23 巻 9 号 p. 515-518
発行日: 1959年
公開日: 2008/04/04
ジャーナル フリーIn diesem Bericht wurde der Einfluss des speziellen Bearbeitens, wie Zug, Druck, Torsion und Biegen, und des Anlassens auf die Härteverteilungen der Stahldrähte untersucht. Durch die Zugbelastung über die Streckgrenze wird die Härteverteilung des Stahldrahtes gleichmässiger. Die Härte in Einschnürungsstelle ist höher in Rand als in Kern. Durch das Drucken nimmt die Härte des Drahtes im luftpatentierten Zustand zu, besonders in Kern beträchtlich und im gezogenen Zustand ab und wird in der Verteilung gleichmässiger. Durch das Torsionsbearbeiten des Drahtes wird die Härte in Kern ein wenig höher und in Rand am grössten, insbesonders beträchtlich beim luftpatentierten Draht. Beim um 90° gebogenen Zustand ist die Härte in luftpatentiertem Stahldraht in aussem und innem Rand am höchsten und in gezogenem Draht nimmt in der Innenseite der Biegung ab und in der Aussenseite zu. Beim um ±90° gebogenen Zustand ist die Härte in luftpatentiertem Draht in Rand am höchsten und in gezogenem Draht zeigt im ganzen eine komplizierte Änderung, nämlich im kernigen Teil nimmt die Härte in der Innenseite der ersten Biegung zu und in der Aussenseite ab. Durch das Anlassen wird die Härte des gezogenen Stahldrahtes bei 300°C am höchsten und mit steigender Temperatur in der Verteilung gleichmässiger.抄録全体を表示PDF形式でダウンロード (553K) -
今井 勇之進, 熊沢 増治1959 年 23 巻 9 号 p. 518-522
発行日: 1959年
公開日: 2008/04/04
ジャーナル フリーIn oder to clear the sintering process of intermetallic compound CoAl, the density and hardness were measured, and the thermal expansion was observed, as funnctions of sintering temperature, time and compacting pressure. The most suitable sintering conditions were compacting pressure of 2∼7 t/cm2, sintering temperature of 1400∼1550° and sintering time of 4∼8 hrs in vacuum of 10−4 mmHg. The physical and mechanical properties of sintered CoAl, namely, the oxidation resistance in air at 1000°, the axial rupture strength by compression, the transverse rupture strength by bending and the impact strength by Charpy were examined. The following experimental results were obtained. The oxidation resistance of sintered CoAl was more excellent than the super-alloys LCN-155 and 25-20, and the maximum rupture strength by compression was 9.5 t/cm2. The transverse rupture strength and impact strength were larger at higher temperature.抄録全体を表示PDF形式でダウンロード (727K) -
若松 茂雄1959 年 23 巻 9 号 p. 522-525
発行日: 1959年
公開日: 2008/04/04
ジャーナル フリーThe Spectrophotometric method for quantitatively determining minute amounts of Be is based on the reaction of Be with aluminon in the presence of a sequestering agent which acts to remove interferences (Al, V, etc.). A red-colored complex is formed having an absorption peak at 530 mμ. The system obeys Beer’s law between the limits of 0.01 and 0.1 mg of Be. The method is accurate and precise. A satisfactory procedure for determing Be in stainless steels was developed. The interfering effect caused by large amounts of Fe, Ni, Cr, etc. were eliminated by the magnetic mercury cathode method.抄録全体を表示PDF形式でダウンロード (505K) -
市山 正, 高階 喜久男, 今井 卓雄, 吉見 竹司1959 年 23 巻 9 号 p. 526-530
発行日: 1959年
公開日: 2008/04/04
ジャーナル フリーThe Snoek damping peak in iron has been studied in Armco iron with variation in microstructure, using a torsion pendulum at about 3 cps. Fully developed α-veining and grain boundary ridges are observed in a specimen cooled in furnace from γ-range. A Snoek damping peak in such a specimen quenched from temperatures below 650°C is only the normal nitrogen peak. On the other hand, that in a specimen freed from α-veining by quenching from 720°C becomes broadened with the internal friction considerably higher on the higher temperature side of the normal nitrogen peak. This broadened peak can be described as the sum of the normal carbon and nitrogen peaks. The height of the nitrogen peak does not vary appreciably with increasing quenching temperature up to 650°C. From this nitrogen peak, we estimate that the nitrogen content in the alpha solid solution was about equal to that in Armco iron. From these results, it is evident that carbon concentrates along the sub-boundaries and grain boundaries. Therefore, it seems likely that carbon is responsible for the α-veining and grain boundary ridging effects visible under the microscope. The Snoek damping peak in a specimen freed from the α-veining and grain boundary ridges by recrystallization in α-range is broadened. This broadened peak also can be described as the sum of the normal carbon and nitrogen peaks. The height of the component carbon peak increases with increasing quenching temperature, but that of the component nitrogen peak does not vary appreciably.抄録全体を表示PDF形式でダウンロード (845K) -
椙山 正孝, 中山 忠行1959 年 23 巻 9 号 p. 530-534
発行日: 1959年
公開日: 2008/04/04
ジャーナル フリーThe present authors made observations on oxide films formed on the surface layers of Fe-Cr-Al alloys and electrical heating alloys (Kanthal A and Fe-Cr JIS No. 2), when the alloys came into contact with air at high temperature (700∼1000°C), by using the transmission electron diffraction method. Thereby the authors detected heat-resisting films consisting of fine γ- and α-Al2O3 crystals which are supposed to be already in existence on the surfaces of excellent heat-resisting Fe-Cr-Al alloys (ca. 2∼5%Al) and electrical heating alloys in the earliest stage of oxidation. In the course of the observations, the authors studied the effects that the quantities of Al and Cr contained in the alloys and their oxidation temperatures exert on the high temperature oxidation films. The present studies also verified experimentally that Cr2O3 and α-Fe2O3 crystals produced on the surfaces of electrical heating alloys at 700° for 3 min change into α-Al2O3 crystals in the course of alumino-thermic reaction at 1000°C.抄録全体を表示PDF形式でダウンロード (785K) -
椙山 正孝, 中山 忠行1959 年 23 巻 9 号 p. 534-538
発行日: 1959年
公開日: 2008/04/04
ジャーナル フリーThe present authors made observation on oxide films and scales produced on the surface layers of Fe-Si alloys (ca. 1∼6%Si) and Fe-Si-Al alloys (ca. 1∼6%Si-1∼6%Al), when the alloys came into contact with air at high temperatures (700∼1200°) by using the transmission electron diffraction and X-ray diffraction methods. Thereby the authors detected the special heat-resisting films consisting of amorphous oxides or fine Al2O3 crystals which were formed on the surfaces of Fe-Si and Fe-Si-Al alloys in the earliest stage of oxidation at 700°C and 1000°C (Table 1). The amorphous oxide films produced on the alloys at 700°C for 5 min and 1000°C for 2 min changed into α-cristobalite crystals by reheating the films at 1200°C for 3 hr. The present studies also clarified experimentally that SiO2 (α-quartz, α-cristobalite and α-tridymite, and Fe2SiO4 crystal layers are formed inside the iron oxide scales on the surfaces of Fe-Si alloys oxidized in air at 1100°C and 1200°C (Table 2).抄録全体を表示PDF形式でダウンロード (744K) -
麻田 宏, 小池 吉蔵1959 年 23 巻 9 号 p. 538-542
発行日: 1959年
公開日: 2008/04/04
ジャーナル フリーThe strengthening effect of annealing prior to solution heat-treatment of extruded 17S rods has been studied. The tensile strength of 17S rods was shown to be increased by preheating at suitable temperatures. The improvement in strength, however, did not take place when the extruded temperature was lower than 400°C, and also it could not be observed when manganese was absent in the alloy. The preferable preheating temperature for improvement in tensile strength was determined by the preheating time and the extruding temperature. From the above experimental evidences, it has been concluded that the strengthening effect due to the preheating may be explained in conformity to the constraining effect on boundary migration due to the precipitated particles of manganese compounds in the subboundary regions and the effect as a barrier of the small angle boundary to moving dislocations.抄録全体を表示PDF形式でダウンロード (886K) -
久保田 喜雄1959 年 23 巻 9 号 p. 542-545
発行日: 1959年
公開日: 2008/04/04
ジャーナル フリーBy heating in vacuo, the reactivity (the rate of H2 evolution in HCl) of distilled Zn powder (D-Zn) increases slightly, while that of the high-active electrolytic Zn powder (E-Zn) decreases nearly to that of D-Zn, inspite of only 10 to 20 per cent decrease in the specific surface area by possible sintering. This enormous decrease in activity is accompanied by the decrease in the X-ray diffraction broadening in {103}, corresponding to decrease in the degree of crystal imperfection. An attempt to increase the reactivity by grinding, or to diminish the crystal imperfection by exposing to ultrasonic waves has been unsuccessful. It was found that the reactivity of Zn powder is independent of the quantity that has already dissolved, indicating that the crystal imperfection prevails homogeneously throughout the Zn particle. The observed slight change in reactivity of Zn powder on heating or on dissolving the surface layer seems to have much to do with the surface film that has been formed in air and not necessarily with the crystal imperfection limited to the surface.抄録全体を表示PDF形式でダウンロード (665K) -
久保田 喜雄1959 年 23 巻 9 号 p. 546-548
発行日: 1959年
公開日: 2008/04/04
ジャーナル フリーIt has been found that large dendritic particles were obtained under moderate current densities without stirring, that a high degree of crystal imperfection resulted when an electrolytic solution dilute in zincate and concentrated in NaOH was electrolysed with high current density below 35°C, and that the degree of crystal imperfection corresponded with the reactivity per unit surface area. The low chemical reactivity of E-Zn deposited at higher temperature is due rather to the stabilization of the lattice during the crystal growth than the possible dissolution of the active parts, or the crystal imperfection as formed.抄録全体を表示PDF形式でダウンロード (576K) -
作井 誠太, 森 勉1959 年 23 巻 9 号 p. 549-552
発行日: 1959年
公開日: 2008/04/04
ジャーナル フリーThe tensile properties of polycrystalline zinc specimens under dynamic loading were investigated, comparing them with those obtained under static loading. The strain rate in dynamic tensile test was changed from 2.00×103%/sec to 1.10×104%/sec, while in static test it was 3.3×10−1%/sec. Of the specimens with smaller grains, the tensile strength in dynamic test was twice as large as that in static test and the elongation decreased to half. The larger the grain size of the specimen was, the smaller became the difference of these properties at dynamic and at static tests. A slight increase in the strain rate at dynamic test resulted resulted in an increase of the tensile strength and a decrease of the elongation. When the specimens were pre-elongated about 15% or more before dynamic tests, they showed the same total elongation as in static tests.抄録全体を表示PDF形式でダウンロード (837K) -
作井 誠太, 森 勉1959 年 23 巻 9 号 p. 552-555
発行日: 1959年
公開日: 2008/04/04
ジャーナル フリーThe behaviour of zinc single crystals, mainly with respect to twinning, under dynamic tensile loading was investigated by the use of the piezoelectricity-cathode ray oscillograph system without any electronic amplification. This load measuring system was very suitable to record with high fidelity such a phenomenon as twinning which always accompanies rapid stress relaxation. In dynamic loading the twinning stress, resolved to the twinning direction on the twinning plane, was larger by about 30% than that in static loading. The deformation twin seemed to grow in much shorter time than 0.7×10−3 sec, at least, in dynamic loading. The specimens, which fractured with little elongation and formed no twin on the surface in dynamic loading, broke down by cleavage across the (0001) plane. On the cleavage plane of the specimen, which formed many twins on its surface, there appeared the traces of the (10\bar10) plane of the matrix and of the (0001) plane of the deformation twins in all cases of loading, both static and dynamic.抄録全体を表示PDF形式でダウンロード (973K)
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