All issues
Volume 18, Issue 12
Displaying 1-12 of 12 articles from this issue
- |<
- <
- 1
- >
- >|
-
Takuichi Morinaga, Tsuneo Takahashi, Shigeo Muromachi, Shigenori Hori1954 Volume 18 Issue 12 Pages 607-609
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSDirectionality in sheet by oneway rolling was revealed by earing in deep drawing, or by pattern in surface finishing. Then the authors took up the problem how to control the directional properties of sheet. The results are summarized as follow: (1) The rolling schedule shown in Table 1 was not effective to control the directional properties. (2) Some added elements were effective to control the above properties. (3) The rolling texture of sheet by oneway rolling may approximately coincide with the drawing texture of wire.View full abstractDownload PDF (474K) -
Hikozô Endo, Saburô Shimodaira, Yoshinobu Sawada1954 Volume 18 Issue 12 Pages 610-613
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe change in natural electrode potential resulting from the relative movement between the electrode and adjacent solutions was measured. Measurements were carried on mild steel, 16 per cent chromium steel, copper and aluminum in dilute acid and alkaline solutions (pH 11∼0). Mild steel electrode became more positive by motion. A 16 per cent chromium steel electrode was similar to that of mild steel in its behaviou, but the magnitude of potential change was larger than that of mild steel. Copper electrodes had a transition point of potential change. The change was more positive above the point and more negative under the point. Aluminum electrode hecame always more positive. These results were explained with the local cell theory of corrosion.View full abstractDownload PDF (618K) -
Yuzo Nakamura, Motoi Nishisaka1954 Volume 18 Issue 12 Pages 614-617
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIt is not yet cleared whether the electrostatic capacity and leakage current of dielectric film is influenced or not by the grain size of high-purity aluminium foil which are used for anode of electrolytic condenser. The investigation was carried out with foils of 99.99% and 99.9% purities. Various grain sizes were obtained by the following methods. (1) After rolling with a heavy reduction from 1 mm to 0.1 mm (90%), the specimens 0.1 mm thick were annealed at various temperatures (250∼550°). (2) Initial sheets (0.125, 0.20, 0.40 mm) were rolled down to 0.1 mm in thickness. All the specimens were then annealed at 380° for 2 hrs and were etched electrolytically so that their weight was reduced by 24% each. Then it was found that the foil annealed at the end temperature of recrystallization (300∼320°), i,e, the foil of minimum grain size, has the maximum capacity in the experiment using the specimens of method (1). With the specimens of method (2), it was also ascertained that the foil with smaller grain size has the larger capacity, and the larger the capacity, the higher the leakage current is. If the grain size of 99.99% aluminium foils made by method (2), is so small as 0.1 mmφ, it would have a superior dielectric property with not less capacity and lower leakage current than 99.9% aluminium foil.View full abstractDownload PDF (730K) -
Tomo-o Sato, Hideo Kaneko, Katashi Masumoto1954 Volume 18 Issue 12 Pages 617-620
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn order to furnish fundamental data for the production of cuprous oxide rectifier of high quality, the effect of oxygen or sulphur which decreases the rectifying resistance in the conducting direction and nickel which increases especially the resistance in the reverse direction coexisting in copper on the rectifying properties was studied. In this study, the measurement of the rectifying characteristics, their temperature dependence and the change of conducting current at 0.8 V and reverse current at 6 V in running test was carried out and the following results were obtained: (1) When a copper disk contains both nickel and oxygen, by nickel it shows higher rectifying resistance both in the conducting and the reverse directions than the other containing nickel or oxygen singly. (2) When a copper disk contains nickel and sulphur, with 0.01∼0.1% nickel it shows higher resistance in the reverse direction than the other containing nickel or sulphur singly, but the resistance in the conducting direction scarcely changes in comparison with the one containing sulphur alone. (3) Their temperature dependence and the change of conducting current at 0.8 V have nearly the same tendency with the others containing each element singly. (4) From the measurement of the change of reverse current, i.e. the creep, at 6 V, these copper disks show higher creeping percentage than the others containing oxygen, sulphur or nickel singly.View full abstractDownload PDF (531K) -
Kazuo Hori, Masatoshi Murohara1954 Volume 18 Issue 12 Pages 621-624
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSA many excellent Al-alloys are known in these days but a quite good castable Al-alloys which show high mechanical properties are very rare. The author has studied on the solidifying volume change of Al and its alloys and found the effective property of titanium in these regions. Titanium is aused in some Al-alloys with a view to make a fine crystallization but is not utilized as the element which reduces the solidifying shrinkage of Aluminium remarkably. Then, the composition of Al-multiple system containing titanium has been studied by measuring the castability, the mechanical, the physical and the chemical properties and a new composition of castable and strong Al-alloy has been decided. This composition is as follows: Si 3.5%, Cu 2%, Mg 0.4%, Mn 0.5∼2%, Ti 0.4%, Al residue.View full abstractDownload PDF (643K) -
Takuji Kanno1954 Volume 18 Issue 12 Pages 625-629
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSSimultaneous determination of Mn and Cr was studied with a spectrophotometer. Unless the period of boiling is kept within 2 mins. HMnO4 decomposed gradually, through the oxidation of Mn by (NH4)2S2O8, so that we could not obtain reproducible results. When oxidized with KIO4, the same absorbancy was obtained by boiling for 3 or 10 mins., and its solution was stable for 4 hrs. at least. If the solution included over 1.2 N of H3PO4, the oxidation of Mn by KIO4 was supressed. Therefore, oxidation should be done with a solution containing below 1N of it. The concentration of H3PO4 had strong influence on the absorption curve of H2Cr2O7, therefore, we must define the concentration of it rigidly.
When the solution contained large amount of Ni or Co, satisfactory results were obtained by using the same sample solution that was freed of Cr by NaOH-H2O2 method, as reference solution. At 565 mμ, Mn was determined without influence of absorption of H2Cr2O7, because the absorption of H2Cr2O7 was negligible. Accordingly, the determination of Mn and Cr was done simultaneously by measuring the absorbancies at 440 mμ and 565 mμ.View full abstractDownload PDF (804K) -
Gunji Shinoda, Yoshitsugu Amano1954 Volume 18 Issue 12 Pages 630-633
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSAfter 5∼30% roolling of 70/30 brass single crystals low temperature annealing at 255° was done. The methods of X-ray analysis were (1) Ordinary back reflection, (2) Ordinary transmission, (3) divergent ray back reflection and (4) divergent ray transmission methods. By annealing, the lattice constant at first decreases, then increases and finally reaches a certain limiting value. But in pure copper such complicated changes were not observed. Transmission Laue photographs show some changes after annealing of 10∼20 min, and after prolonged annealing the patterns are restored to the original ones. As these changes are not observed in pure copper, they must be attributed to a certain change in solid solution corresponding to anomalous hardening in α-brass. Kossel lines show some faults by 5% rolling, and slight changes have been observed after annealing of very short duration. By divergent ray back reflection method the same kind of changes in solid solution was observed upon annealing of 20∼40 min at 200°. Such changes were observed three days after cold twisting by measurement of electric resistance.View full abstractDownload PDF (790K) -
Katsumi Okada, Yoshihiro Shinoda1954 Volume 18 Issue 12 Pages 633-637
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn the previous paper, it has been shown that the banding behavior at room temperature is related to the orientation of crystals: i.e. cluster slips are formed in the crystals oriented (100) and (111) in standard stereographic projection. In the present paper, crvstals were extended at 300° and 500° with the strain rates of 12.7%/min and to 0.382%/min, respectively. As the results, it is shown that the orientation of crystals is responsible for the uniform slip, cross slip, unpredicted slip, and cluster slip, all with deformation bands, and for the cross slip only. In comparison with results at room temperature, deformation bands were easy to form and then the range of orientation of crystals forming deformation bands were spread, and the unpredicted slip increased with rising temperature. Furthermore, the indices of that plane were analysed.View full abstractDownload PDF (1245K) -
Toyojiro Isano1954 Volume 18 Issue 12 Pages 637-640
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSPure nickel plplates rolled to several thickness were anneald at various temperature, and the manner of their isothermal sofenting was studied, by observing the changes in their tensile strength and the hardness in the progress of annealing. The results obtained were discussed in connection with the influences of the received cold working, for the sake of study on the mechanism of sofenting.View full abstractDownload PDF (554K) -
Shigeo Ôwaku, Hideo Akasu1954 Volume 18 Issue 12 Pages 640-642
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn the earlier report the authors obtained the C.C.T. curve for 18-4-1 high speed steel (JES 2). In the present report the authors give the C.C.T. curve for 18-4-1+10 high speed steel (JIS4) containing Co (11%). Specimens are cooled under the method “end-cooling”, and rapidly cooled in water after the lapse of varying time, their structures being fixed at various phases thereby. Then, their microstructures and hardnesses are examined for determination of the C.C.T. curve. The results show that the temperature at which super-cooled austenite is most unstable is about 780° and the critical cooling velocity about 26°/min, which is slower than in still-air cooling. Compared with C.C.T. curve for 18-4-1, that of 18-4-1+10 is on a higher level and leans more to the left side. Presumably that is due to Co (11%), for this element tends as generally accepted to raise critical cooling velocity.View full abstractDownload PDF (523K) -
Susumu Morioka, Kazutaka Sakiyama1954 Volume 18 Issue 12 Pages 643-646
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe anodic polarization of iron-chromium alloys in 5%, 1% and 0.1% sulphuric acid solutions and in those containing varying amounts of chlorine ions was studied at 25°. The results obtained are as follows: (1) The magnitude of anodic polarization depends on the electric conductivity of the electrolyte used and the critical current density needed to cause the passivity is the lower, the greater the magnitude of polarization and the chromium content in the alloy. (2) The relation between the critical current density and the potential from which the passivation sets in is not definite, depending on the chromium content in alloys. (3) The chlorine ions in the electrolyte hinder the passivation of alloys and at a definite acid concentration the greater the chromium content in the alloy and with a definite alloy the greater the acid concentration the higher was the concentration of chlorine ions needed to hinder the complete passivation of the alloy.View full abstractDownload PDF (600K) -
Susumu Morioka, Kazutaka Sakiyama1954 Volume 18 Issue 12 Pages 647-650
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn order to explain the mechanism of the hindering effect of chlorine ions on the passivation of iron-chromium alloys, we investigated the process of anodic polarization in sulphuric acid solutions containing chlorine ions and containing no chlorine ions. It was deduced that the hindering effect of chlorine ions on the passivation of iron-chromium alloy is due to (1) the strong oxidizing action of chlorine atoms discharged and adsorbed on the anode (the direct action for dissolution of passive anode) and to (2) the reducing action of chlorine ions for Cr2O7=anions produced to from the complex salt of Cr3+ ions (the indirect action for dissolution of passive anode) and not to a power of the chlorine ions to penetrate oxide film, resulting in an active state.View full abstractDownload PDF (573K)
- |<
- <
- 1
- >
- >|