巻号一覧
28 巻, 2 号
選択された号の論文の11件中1～11を表示しています
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鈴木 寿, 椙山 正孝, 梅田 高照1964 年 28 巻 2 号 p. 55-58
発行日: 1964年
公開日: 2008/04/04
ジャーナル フリーWC-10%Co alloys with various contents of carbon were prepared by the addition of sugar carbon to as-received WC powder and subsequent ball-milling and vacuum-sintering at 1370°∼1450°C for 1 hr followed by furnace cooling. The effect of the carbon content on the properties of the alloys such as hardness, transverse-rupture strength, density, grain size, electrical resistivity and its coefficient, lattice constant of binder phase, relative magnetic saturation, coercive force and microstructure were studied in detail. The main results obtained are as follows.
(1) All properties of the alloy vary characteristically with carbon content. (2) The strength of the alloy becomes a maximum, when the carbon content of the alloy in the two-phase range attains approximately a maximum (when at 6.15∼6.18 wt%C it is larger than the theoretical carbon content of WC). (3) Under this condition, for example, lattice constant of the binder and the electrical resistivity is at its minimum. (4) The narrow two-phase range corresponds to the width of about 0.15∼0.18 wt%C, which is wider than that induced from the result by J. Gurland(1). (5) The carbon content in cemented carbides is successfully controlled by adding free carbon to the powder as already mentioned.抄録全体を表示PDF形式でダウンロード (954K) -
郡司 好喜, 的場 幸雄, 小野 清雄1964 年 28 巻 2 号 p. 59-64
発行日: 1964年
公開日: 2008/04/04
ジャーナル フリーData on the solubility of hydrogen in liquid metals are of practical interest. The solubility of hydrogen in liquid pure iron was measured with the ordinary hot-volume method. The following problems regarding the hot-volume method were examined: Selection of the melting crucible; selection of the standard gas for determination of the hot volumes of the apparatus; effects of the shapes, the magnitude of the dead spaces and the cooling methods of the melting chamber on the solubility of hydrogen.
The results obtained were as follows:
(1) Among alumina-, magnesia-, beryllia- and thoria-crucible, thoria crucible was the only melting crucible which could be used in the hot-volume method.
(2) Helium and argon were used for the standard gas. But according to the difference in the thermal properties between the gases, different experimental solubility values were obtained.
(3) Among the experimental solubility values, the most reliable value was obtained by using helium whose thermal properties are most akin to hydrogen and at the same time by using a completely water cooled reaction tube whose inner volume was reduced to an extreme.
(4) The solubility of hydrogen in liquid pure iron and the standard free energy change in dissolving of 1 wt%H were expressed as a function of temperature as follows:
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郡司 好喜, 小野 清雄, 青木 愿樹1964 年 28 巻 2 号 p. 64-68
発行日: 1964年
公開日: 2008/04/04
ジャーナル フリーIn a previous report the solubility of hydrogen in liquid pure iron was determined with an improved hot-volume method. From the results, the authors judged it possible to measure the effects of various elements on the solubility of hydrogen in liquid pure iron with the same method, and examined the effects of chromium, vanadium, wolfram, molybdenum, nickel and cobalt. The experimental methods were quite the same as those in the previous experiments. According to the previous results, the completely water cooled reaction tube of fused quartz for the melting chamber, helium gas for the standard gas and thoria crucible for the meltingcrucible were used.
The results obtained were as follows:
(1) The solubility of hydrogen in liquid iron was increased by chromium, vanadium, and nickel. It was decreased by wolfram, molybdenum and cobalt.
(2) The effect of carbon on the solubility of hydrogen could not be determined owing to the reaction between thoria and dissolved carbon.
(3) The interaction parameters between each of the alloying elements and hydrogen dissolved in liquid iron in the temperature range from 1550°C to 1650°C were as follows:
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三谷 裕康, 大西 正己1964 年 28 巻 2 号 p. 68-72
発行日: 1964年
公開日: 2008/04/04
ジャーナル フリーIn den Si-Fe-Legierungen bringt die 6∼7% siliziumhaltige Legierung die höchste Permeabilität und den kleinsten Hysteresisverlust. Diese siliziumhaltige Legierung ist aber als das Transformatorblech zu der praktischen Anwendung noch nicht gelangt, weil die Walzeverformung zum Blech wegen der Sprödigkeit dieser Legierung schwierig ist.
In dieser Versuchung wurde nach Bildung der porenfreien Silizierungsschicht auf dem niedriggekohlten Stahlplättchen die Diffusionsglühen für Gleichung der Si Konzentration durchgefurt. Das Ergebnis zeigt, daß eine 6.25% siliziumhaltende Probe, welche durch die zweimal 21.5 minutigen Silizierungen von der Ober- und Rückflächen eines Stahlplättchens und die 8 stundigen Nachglühen gewonnen wurde, die beste war. Dabei waren Maximalpermeabilität μmax, koerzitive Kraft HC10 und Hysteresisverlust Wh10 bzw. 10800, 0.22 Oe und 770 erg/cm3/cycle.抄録全体を表示PDF形式でダウンロード (787K) -
戸田 忠俊1964 年 28 巻 2 号 p. 72-78
発行日: 1964年
公開日: 2008/04/04
ジャーナル フリーRods of Co-W (0∼25%) alloys were made by sintering and hot swaging. Dilation behaviors through the α\ ightleftarrowsβ transformation and X-ray diffraction analyses of quenched or tempered specimens were examined for these alloys. The temper hardening and the T.T.T. diagram of the β-to-α transformation were measured in detail for Co-25%W alloys. The results obtained are concluded as follows: (1) The crystal structure of Co-25%W alloy quenched from 1100°C has the f.c.c. lattice of β-phase. (2) Upon the tempering of quenched specimen at 600°∼675°C, retained β-phase transforms slowly into the h.c.p. lattice of α-phase accompanying the increase in hardness. The rate of the transformation is apparently controlled by diffusion. The maximum Vicker’s hardness value, 750, is attainable by optimum conditions of the tempering. (3) The T.T.T. diagram of the β-to-α transformation was determined in Co-25%W alloy by the metallographic method. The nose of the T.T.T. diagram is placed at about 750°C, where the beginning or the ending time of the transformation is equal to about 700 sec or 10,000 sec respectively.抄録全体を表示PDF形式でダウンロード (1578K) -
石河 三郎, 中沢 一雄1964 年 28 巻 2 号 p. 79-86
発行日: 1964年
公開日: 2008/04/04
ジャーナル フリーWith the use of cold-rolled 7-3 brass plates of 10, 25, 50, 75 and 90% reductions and cold-rolled OFHC copper, tough pitch copper and phosphorus-deoxidized copper of 90% reduction, the dilatation changes in the perpendicular or parallel direction to the rolling direction were measured during heating by the differential dilatometer to examine the anisotropy in the dilatation changes. Further, using cold-drawn aluminium-brass tubes of 3, 7, 10, 25 and 30% reductions and 0.25, 0.10 and 0.015 mm in grain size, the effects of grain size, degree of reduction and annealing temperature on the circumferential residual stress were determined by a longitudinally slitting method. The anisotropy in dilatation change was found in both copper and 7-3 brass but the degree of dilatation in copper is much smaller than that in 7-3 brass. And the dilatation becomes larger with the increasing degree of reduction. The dilatation changes in 7-3 brass revealed a remarkable anisotropy in the degree of dilatation and its process, and a most part of the dilatation changes occurred at the temperature range corresponding to the recrystallization stage, but not to the “anneal-hardening” stage. This indicates that the circumferential residual stress measured for cold-drawn aluminium-brass tubes increases with the decrease in grain size and the increase in the degree of reduction, but in the case of fine grain size there is a limiting degree of reduction which provides the maximum residual stress. The sharp anisotropic changes observed at the temperature near 300°C in the dilatation curves of 7-3 brass with a high degree of reduction correspond to the occurrence of the embrittlement phenomenon during annealing as found mainly in the manufacturing process of aluminium-brass tubes. This anisotropic dilatation change seems to exist commonly in the cold-worked brass and to have relation to the embrittlement phenomenon during annealing, together with other factors such as residual stress and the heating condition.抄録全体を表示PDF形式でダウンロード (1987K) -
椙山 正孝, 鈴木 寿, 貴堂 隆明1964 年 28 巻 2 号 p. 86-90
発行日: 1964年
公開日: 2008/04/04
ジャーナル フリーMechanical properties of Zn-0.6Cu-0.10Ti rod and wire, fabricated by hot extruding and subsequently by cold rolling or drawing, were mainly investigated. The experimental results were as follows; (1) Tensile strength of the hot-extruded rod showed, independently of the extruding ratio, 26∼30 kg/mm2 which exceeded the value of rolled strip, but the tensile elongation and hardness were almost the same as those of the strip and the annealing temperature had a little effect on these properties. (2) When the rod was cold-reduced, the strength and hardness were decreased and the elongation was increased with increasing reduction. (3) The tensile strength and hardness of rod and wire were increased after low-temperature annealing, when the cold reduction exceeded about 75% for the tensile strength and about 50% for the hardness. And the almost same values as the extruded ones could be obtained by annealing of more than 90% reduction. (4) The most suitable annealing temperature to get the maximum strength for the highly cold-reduced wire was over the range from 150° to 200°C.抄録全体を表示PDF形式でダウンロード (753K) -
前田 久義, 河部 寿雄, 遠藤 敬人1964 年 28 巻 2 号 p. 91-95
発行日: 1964年
公開日: 2008/04/04
ジャーナル フリーIt is generally said that the toughness of quenched and tempered steel depends upon the austenitic grain size of steel iust before quenching. However, we have compared, on the structural steel in case of insufficient quenching, the toughness and the fatigue strength after tempering between ordinary quenched steel with fine austenitic grain and forge-quenched steel with coarse austenitic grain, and also investigated the effects of the forging ratio and the final forging temperature on the toughness of the forge-quenched steel. The above study has lead us to the following conclusions. (1) In case of the absence of complete quenching, the toughness of quenched and tempered structural steel is more heavily affected by the degree of insufficient quenching rather than by the size of austenitic grain. Thus, the impact value of a tempered medium carbon steel which has been forge-quenched is doubled as compared with that of ordinary quenched steel. (2) Since the heating temperature of the die forging process is generally held at about 1,300°C in applying the forge-quenching method, the toughness of forge-quenched steel is hardly influenced by the forging ratio and the finishing temperature of forging. (3) In respect of the fatigue strength, the forge-quenched steel is equal or superior to the ordinary quenched steel. (4) In view of the above results, it may be concluded that application of the forge-quenching method often makes it possible to replace alloy steel parts with carbon steel parts or to reduce the weight of carbon steel parts.抄録全体を表示PDF形式でダウンロード (654K) -
増本 量, 斎藤 英夫, 菅井 富1964 年 28 巻 2 号 p. 96-101
発行日: 1964年
公開日: 2008/04/04
ジャーナル フリーThe mean thermal expansion coefficient in the temperature range from 20° to 50°C, and Young’s or rigidity modulus at 20°C and their mean temperature coefficient in the range of 20° to 50°C were measured with annealed alloys of cobalt, iron and manganese, and the influence of the addition of nickel on the property was also examined to ascertain whether the theory of the small expansibility of Invar, proposed previously by one of the present investigators, is valid in the above alloy system, and whether the effect of the addition of nickel observed with the alloys of cobalt-iron-chromium, cobalt-iron-vanadium, cobalt-iron-molybdenum and cobalt-iron-tungsten systems can be observed with the alloys mentioned above.
In the ternary system of cobalt, iron and manganese, it was found that the temperature coefficient of Young’s modulus showed its negative minimum value in the neighbourhood of the composition having the minimum thermal expansion coefficient, and the relation of the temperature coefficient of the elastic modulus to the alloying concentration was almost similar to that observed with each alloy system mentioned above, with the exception that the present alloys did not show any positive value of the coefficient. When 10% of nickel was added to the ternary alloys, the range showing a positive value of the temperature coefficient of the modulus began to appear. With an increase of the nickel content, the minimum value of the thermal expansion coefficient became smaller, and the positive maximum value of the temperature coefficient of elastic modulus larger, and the cobalt content in the alloy showing these characteristics was substituted by nickel in the same way as in the case of the alloys mentioned above, while in the quaternary system containing 10% nickel, the manganese content was deviated to a higher content than that calculated from the substitutional law which is valid for the elements of chromium, vanadium, molybdenum and tungsten; this deviation was explained by the fact that the microstructure of the alloy is not composed of an austenite or a mixture of austenite and ferrite, but of a martensite. Some alloys having a small temperature coefficient of elastic modulus were named “Mangelinvar”.抄録全体を表示PDF形式でダウンロード (1395K) -
馬場 義雄, 寺井 士郎1964 年 28 巻 2 号 p. 102-107
発行日: 1964年
公開日: 2008/04/04
ジャーナル フリーIt is well known that very coarse crystals, up to 2 mm in length, found in large extrusions of 7075 alloy, have been identified as primary crystals of CrAl7 which grew under semi-continuous casting, and have caused the decrease in fatigue strength.
Experiments were carried out to make a study of the prevention of the occurrence of “giant” chromium compounds without decreasing the resistance to stress corrosion cracking in Al-Zn-Mg-Cu alloys.
The results obtained are as follows:
(1) When the Cr content is less than 0.23% in Al-5.5%Zn-2.5%Mg-1.6%Cu alloy, the occurrence of “giant” chromium compounds is suppressed in commercial practice. However, the addition of >0.3%Mn, >0.3%Fe or >0.05%Ti promotes their occurrence.
(2) The addition of Zr 0.1% has no influence on the occurrence of “giant” chromium compounds, and the addition of 0.2 to 0.3%Zr prevents their occurrence. It might be due to the increase in solubility of Cr in the Al-matrix caused by the formation of primary crystals of ZrAl3 before CrAl7 at a higher temperature.
(3) It is concluded that Al-Zn-Mg-Cu alloy containing both 0.2%Cr and 0.1%Zr is a material having an excellent resistance to stress corrosion cracking, without fear of the occurrence of “giant” intermetallic compounds in industrial production.抄録全体を表示PDF形式でダウンロード (1636K) -
斎藤 英夫, 菅井 富, 森田 博昭1964 年 28 巻 2 号 p. 108-109
発行日: 1964年
公開日: 2008/04/04
ジャーナル フリーPDF形式でダウンロード (195K)
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