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Volume 18, Issue 1
Displaying 1-17 of 17 articles from this issue
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Kichizo Niwa, Tsuguyasu Wada1954 Volume 18 Issue 1 Pages 1-5
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe oxidation of pyrite in a stream of air was investigated with X-ray analysis and spring balance at the temperature range 600∼800°. The identified substances with X-ray analysis were FeS2, FeS1+x, and α-Fe2O3. None of other products, e.g. sulfate, was found out. The composition of FeS1+x was estimated as 1+x=1.15∼1.18 from its axial ratio. The kinetic consideration shows that the following three processes have proceeded in this oxidation:—
(This article is not displayable. Please see full text pdf.)
The rate constants of the first and the third processes of the above reaction were estimated as follows:—
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Masao Itoh, Toshiyuki Onoe, Gunji Shinoda1954 Volume 18 Issue 1 Pages 5-8
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe plastic deformation of single crystals of 99.9 percent aluminium has been investigated by utilizing a magnetically suspended and electromagnetically driven ultra-high rotational instruments. The dimensions of rotor used were about 22 mm in diameter and 18.5 mm in thickness. They were rotated up to the final rotating velocity of about 1400 r.p.s. and as the time required to attain this final velocity is more than 2 or 3 hours, the specimen had to be loaded quasi-statically. All the slip bands were observed at the outer most part of the rotor and calculating the local shearing stress of them. We have obtained that the critical shearing stress of aluminium is about 70 g/mm2 by the present method.View full abstractDownload PDF (677K) -
Akira Adachi1954 Volume 18 Issue 1 Pages 9-11
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe action of the acid pickling inhibitors such as Restin, Rodine No. 77 and Xylidine were measured. Potentials of mild steel were measured in N-H2SO4 with and without inhibitors. The steady state potentials were measured by a potentiometer and original unsteady state potentials were measured by an oscillograph. The adsorbed film of inhibitors on mild steel could not be removed in acid and neutral salt solution. The desorption in alkaline solution was shown to be nearly perfect but it is not so perfect as to achive a fine hot galvanized surface. The results are shown in Fig. 1∼6.View full abstractDownload PDF (440K) -
Hikozô Endô, Gorô Yokoyama1954 Volume 18 Issue 1 Pages 11-14
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSA research for the corrosion of iron in manufacturing plant of sulfuric acid by tower system was projected. In this paper the corrosion in 50∼90% sulfuric acid solutions without nitrogen oxide is reported. Iron can be employed in condition below 40° temperature and above 60% concentration of sulfuric acid.View full abstractDownload PDF (456K) -
Hikozô Endô, Gorô Yokoyama1954 Volume 18 Issue 1 Pages 14-18
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSCorrosion of iron in 50% sulfuric acid solution shows the same corrosion reaction as in more dilute acid solution. In the acid solution above 60% concentration, corrosion mechanism is different from the one below 50%. Sulfate ions are reduced to sulfite and sulfide ions on the iron surface and the sulfide ions combine with ferrous ions, forming a ferrous sulfide protective film on iron. Developing the corrosion with time, sulfide film is dissolved very slowly and is replaced by ferrous sulfate.View full abstractDownload PDF (939K) -
Jirô Watanabé1954 Volume 18 Issue 1 Pages 18-21
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSLight figures produced by single crystals of sendust containing 10% Si, 5% Al and remainder of Fe, etched with various reagents, have been observed, especially with an aim of finding out light figures suitable for the determination of crystal orientations. Experimental results obtained are summarized in Table 1 of the text. It was found that distinct light figures produced by the {100}, {110} and {111} planes of the crystals etched for a short time with dilute nitric acids (of the concentration less than about 20 percent) at room temperature and at 50∼60° and with boiling saturated aqueous solution of ammonium persulphate, were suitable for the orientation determination and that the most suitable light figures were those obtained by etching with 20 percent nitric acid at 50∼60°.View full abstractDownload PDF (517K) -
Hideji Hotta, Itsurô Tatsukawa1954 Volume 18 Issue 1 Pages 21-25
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSWe constructed the isothermal transformation diagrams at the temperature range of 260∼610°C for structural Ni-Cr steel (0.26 C, 3.39 Ni, 1.22% Cr) and Ni-Cr-Mo steel (0.45 C, 1.43 Ni, 0.84 Cr, 0.26% Mo) by micrography and hardness test, and then inspected the process of isothermal decomposition of austenite at the region of “bainite knee”, using the measurement of dilatation in austempering and tempering. The obtained results are summarized as follows: These isothermal transformation diagrams have the lower or bainite knee in the beginning lines respectively below about 550°C. The reaction in this range exhibits complexities in the form of multiple-stage transformaiotn of austenite as follows: γ→αm+γ′, αm→α+θ, that is, accicular αm separates from austenite at first and, with time, the separation of αm and the breakdown of αm to α−θ aggregate proceed simultaneously, the amount of γ decreasing. With more time, at so-called “ending point” γ disappears under the microscope and the expansion finishes, neverthless he dilatometric results in tempering subsequent to austempering reflect that austenite (chiefly γ′) still exists at the right-hand field of so-called “ending line”.View full abstractDownload PDF (780K) -
Keizo Iwase, Takao Kawakita1954 Volume 18 Issue 1 Pages 25-29
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSA sharpness tester for razor blades of a new type was devised and the mechanism of cutting hairs in shaving was discussed. By the new instrument, the pulling effect could be measured quantitatively and it was found that the pulling effect was an important factor in shaving. The load to cut a string was applied by means of water pressure, so that it could be increased continuously and shockless at a constant rate. The new instrument is capable of measuring the sharpness of a razor blade at any point and is very simple and rapid in operation.View full abstractDownload PDF (741K) -
Yoshikazu Hosoi1954 Volume 18 Issue 1 Pages 29-32
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe same problem was already investigated microscopically and discussed on the basis of meta-stable diagram by Dr. H. Nagasaki. However, other properties were still open to more testings. In the present paper, further experiments for 25.08, 26.88 and 27.31% Sn-Cu alloys were carried out by means of electric resistance measurement, hardness measurement and microscopic analysis. The three isothermal transformation curves which are analogous to Nagasaki’s results were obtained as shown in Fig. 1. In these curves, their nose temperatures are about 350∼400° and the rate of decomposition of 26.88% Sn-Cu alloy is slower than the others. The hardness curves owing to the micfostructural changes of each alloy were classified into two types. One of these types is a single stage hardening curve which has a smooth peak hardness value, and the other is a double stage hardening curve which has a minimum after the first stage hardening. The former is the type of the alloys transformed isothermally above the nose temperature and the latter of the alloys similarly treated below it. These hardness changes were discussed by microscopic and electric resistance.View full abstractDownload PDF (911K) -
Kiyokazu Ogawa, Kôji Ono1954 Volume 18 Issue 1 Pages 33-37
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSOn the grinding work we have previously seen a few investigations, but all of them was limited to inspect only from the side of steel under the grinding. The present authors recognized that failures of grinding work were caused (induced) from mutual relations of the condition of grinding work and steel under the grinding, and, therefore, inspected from both sides of them, and chiefly on bearing steel. On the experiment has been carried out several inspections by the conditions determined previously from the grinding work and obtained experimentally from the limit depth of cut to which the grinding burn on grinding crack occurred on the surface of steel. We could recognize that the formation of failure was dependent on grinding heat which is affected by conditions of the grinding work or the properties of steel under the grinding. The results were as follows: (1) On the grinding burn of various steels, the limit depth of cut of quenched steels is smaller than that of annealed one. (2) Thermal diffusion in the steel under the grinding is smaller, the more sensible grinding burn or grinding crack is. (3) Tempering temperature of the steel after quenching is higher, the less the formation of grinding burn or crack occurs. (4) In case of low tempering treatment, grinding crack precedes to grinding burn, but in case of high tempering treatment, this aspect becomes opposite. (5) Against several phenomena mentioned above, we carried out theoretical investigation from both sides of the grinding work and of the steel.View full abstractDownload PDF (923K) -
Ichiji Obinata, Kenkichi Yamaji1954 Volume 18 Issue 1 Pages 37-41
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSAbout 45 specimens whose liquidus lie in the range of temperature between 900°C and 1100°C, belonging to the Ni-Zn-Cu ternary system have been prepared. For the purpose of obtaining dental casting alloys, the corrosion-resistance the tarnish-resistance and the contraction during solidification of the specimens as well as their mechanical properties have been studied. Although the tarnish-resistance against Na2S solution was not always satisfactory, the alloy belonging to the range of composition: 12∼25% Ni, 42∼47% Zn, balance Cu, showed comparatively good corrosion-resistance. The tensile properties and the shrinkage of the specimens belonging to the range mentioned above, are found to be suitable for dental casting, except the fact that the hardness-value of the specimens is rather high for dental use. By the addition of small amounts of Ag, Si and Pd to the ternary system more suitable alloys for dental casting purpose have been obtained.View full abstractDownload PDF (788K) -
Takashi Ikeno1954 Volume 18 Issue 1 Pages 41-45
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThese experiments were made for the purpose to find and prevent the developement of faults in aluminium ingots produced by a tilting chill mould. The faults of the ingots, solidified under the same various casting conditions as reported previously, were examined by means of specific gravity and hardness tests or microscopic examinations, and also the change of temperature inclination in the course of pouring, reported in the third report, was again considered under another point of view. From the change of the thickness of slabs, the following formula was introduced: Hy=(2Ha+ql^2)/2l ·x-q/_2·x^2 On the otherhand the developement of faults were identified by calculating the ratio of q to H, where the former is the force by which the slab tends to contract to the inner direction and the latter is that by which it tends to maintain the original form (See Fig. 10).View full abstractDownload PDF (759K) -
Kazuo Hori1954 Volume 18 Issue 1 Pages 45-48
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSContinuing the former report, the essential properties of runnability were studied. In this report, the effects of casting condition for runnability were chiefly studied and the relation between runnability and running velocity was inspected using with these results. The results obtained were as follows: (1) The effects of the temperature of the moulds for runnability were clearly recognized and also the differences of running velocity were recognized as depending on different mould’s temperatures of the moulds. (2) The effects of casting temperature were measured with the effects of max. melting temperature and the results showed the runnability depended more on the max. melting temperature than casting temperature. (3) The general relation between the runnability and the running velocity was inspected based on the above experiments and the runing velocity was recognized as one of the chief factors which indicate the runnability.View full abstractDownload PDF (566K) -
Kazuo Hori1954 Volume 18 Issue 1 Pages 48-51
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIt was reported in former reported that the runnability of metals would be affected by the melting condition of metals and the running velocity was picked up as their visible factor. In this paper, many more specimens were prepared and their calorific conditions were fixed at quite same condition for experiments. The following results were obtained. (1) The effects of max. melting temperature for runnability were recognized for the same casting temperature in both zinc and tin. (2) The same effects for running velocity were quite mutually related and in every specimens, the differences of runnability were recognized as the differences of running velocity. (3) The comparison of three specimens in the same calorific conditions pointed out the different runnability and cleared up that the runnability more depended on the melting condition than calorific condition.View full abstractDownload PDF (524K) -
Takashi Ikeno1954 Volume 18 Issue 1 Pages 51-55
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe effect of Fe, Si, Cu and Mn upon the mechanical properties and the recrystallization phenomena of Al sheets which were cold-rolled (9) %) without annealing after hot-rolling was investigated. The results obtained are as follows: By addition of Fe the macro- and the micro-grains of ingots become considerably fine, moreover it lowers the recrystallization temperature and makes the recrystallized grain sizes finer with the rise of Fe contents. Si scarecely affects the above-mentioned properties up to 0.5%, but it lowers the recrystallization temperature above 0.5%. By the addition of Cu, the tensile strength and the hardness always increase with its contents, but it makes the recrystallized structure somewhat finer and lowers the recrystallization temperature. On the contrary, the addition of Mn exerts hardly any effect upon the mechanical properties but it raises the temperature for recrystallization and remarkably coarsens it’s grain size over 0.5%. The additon of Fe is most desirable for deep drawing manufacture of 2S sheets, because of its minimizing the developement of casting crack.View full abstractDownload PDF (977K) -
1954 Volume 18 Issue 1 Pages 56a
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSDownload PDF (59K) -
1954 Volume 18 Issue 1 Pages 56b
Published: 1954
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSDownload PDF (59K)
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