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Volume 21, Issue 7
Displaying 1-14 of 14 articles from this issue
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Tarô Ohtsuki1957 Volume 21 Issue 7 Pages 423-426
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe results show that (1) the rate and the composition of evolving gas from nickel manufactured by different electrolytic nickels and methods were found very variable, (2) by H2 treatment, the quantity of gas and the percentage of CO2 were decreased but the decreasing rate of gas was not constant, but the quantity of gas from samples manufactured without deoxidizers was much decreased by H2 treatment, (3) in the earlier stage, the gas evolved from the different samples consisted mainly of H2 and CO, with a smaller amount of CO2 before and after H2 treatment, (4) under the case of the same electrolytic and manufacturing conditions, both the rate of evolution of CO and the effect of H2 treatment on the tend to decrease with larger quantity of deoxidizer, (5) degassing of brittle nickel was as follows: in the case of brittle specimens, the rate of evolution of gas from the sample increased by H2 treatment, the opposite tendency being observed in the case of ductile nickel. The rate of evolution of the gas from the sample which recovered from brittleness after exposing in the air at room temperature was larger than in the brittle stage but H2 treatment reduced the rate, so the effect of H2 treatment was similar to that on normal nickel.View full abstractDownload PDF (622K) -
Tarô Ohtsuki, Takeo Iwasaki, Kenichirô Andô1957 Volume 21 Issue 7 Pages 426-429
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSH2 CO and CO2 were measured during the producing process. The results were as follows: (1) At the initial and the final stages of melting process, H2 tends to be abundant but less at the middle stage. (2) H2 increasing as the result of reaction between heated nickel and H2O of the ladle, and penetrating into nickel was extremely decreased by hot rolling, (3) CO and CO2 tend to increase at the melt down stage,but to decrease in deoxidizing process. The decreasing tendency of CO2 is more marked than with CO. (4) In deoxidizing, decrease of NiO is observable by a microscopic photograph and this tendency agrees with the measurement results of degassing.View full abstractDownload PDF (654K) -
Hajime Koto, Takaaki Watanabe, Tadahisa Nakamura1957 Volume 21 Issue 7 Pages 429-433
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSUpon statical bending, Charpy impact and repeated impact tests as measure of the brittleness of sintered hard alloys used for the rock bits, it was shown that the number of repetitions causing breakage under repeated impact tests was the best representation of the brittleness of the tips. It was also recognized that these values correlated closely to the boring length until breakage of the tips occurs in field tests. Applying the test standard, in which it was prescribed that there should be no breakage within 1,000 repetitions under 10 kg-cm impact energy in T.K. type repeated impact tester, we found almost no undesirable evidence in any rock bit tips, and we succeeded in selecting highly reliable tips, capable of boring hard rocks to more than 100 meters.View full abstractDownload PDF (770K) -
Tasaburo Nishioka1957 Volume 21 Issue 7 Pages 433-436
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn dieser Untersuchung wurden verschiedene Stahldrähten wärmebehandelt,gezogen und sodann Biegungsverarbeitung gegeben. Die Biegungsverarbeitung wurde in der Weise vorgenommen, dass der Draht auf den verschiedenen Rollen nach einer Seite um 90° umgebogen und zurückgebogen wurde. Danach im luftpatentierten Zustand beim Stahldraht unter etwa 0.50%C nimmt die Zugfestigkeit zu und bei über etwa 0.50%C nimmt sie ab. Im gezogenen Draht nimmt die Zugfestigkeit mit zunehmendem C-Gehalt und mit grösser werdender Gesamtzugabnahme ab. Bei bleipatentierten und auch bleipatentiert-gezogenen Drähte, je niedriger die Bleibadtemperatur wird, desto grösserwird die Abnahme der Zugfestigkeit. Beim Zugversuch im gebogenen Zustand wird die Verminderung der Zugfestigkeit grösser als im zurückgebogenen Zustand. Nach diesen Ergebnissen ist es mir klar geworden, dass die Biegungsverarbeitung des Drahtes ein wichtiger Faktor für Verseilungverlust ist und ausserdem wenn der einmal verseilte Stahldraht aufgetrennt, gerichtet und geprüft wird, die Zugfestigkeit infolge der Änderung der Krümmung in Seildraht partiell sich ändert.View full abstractDownload PDF (687K) -
Yûnoshin Imai, Masao Izumiyama1957 Volume 21 Issue 7 Pages 437-440
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe stabilization of retained austenite after partial transformation to martensite has been investigated using several kinds of steel. A mechanism of stabilization based on the concept of increase in the resistance to martensite formation attributable to interstitial solute atoms, especially carbon or nitrogen, formed clusters in the retained austenite has been suggested.View full abstractDownload PDF (685K) -
Hakaru Masumoto, Hideo Saitô, Yutaka Sugai1957 Volume 21 Issue 7 Pages 441-443
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe influence of addition of 5 per cent of copper on the thermal expansion, the rigidity modulus and its temperature coefficient of alloys of cobalt, iron and chromium has been determined. The relation between the thermal expansion coefficient or the temperature coefficient of rigidity modulus of copper-added alloys and the concentrations is qualitatively similar to that in the case of the ternary alloys of cobalt, iron and chromium, but the relation in the case of rigidity modulus is more complex than in the case of the ternary alloys. The composition at which the thermal expansion coefficient shows its smallest value and the temperature coefficient of the modulus its largest positive value does not show any remarkable change with addition of copper. When copper is added, the concentration range having the positive temperature coefficient of the modulus becomes comparatively narrower. Some elinvar type alloys containing comparatively high chromium have values of rigidity modulus larger than 8×105 kg/cm2, showing an important characteristic for practical application.View full abstractDownload PDF (429K) -
Satoshi Kugasa1957 Volume 21 Issue 7 Pages 443-446
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe relation between the effect of the titanium content and the effect of the preliminary annealing temperature before cold-work on the recrystallization behaviour of cold rolled aluminium-titanium alloy,aluminium-copper-titanium alloy and aluminium-magnesium-titanium alloy has been studied by means of hardness test and microscopic method. The results obtained are as follows: (1) For each kind of these alloys containing Ti up to about 0.1∼0.2%, the elevation of the preliminary annealing temperature from 350° to 550° results in the increase of the initial or final recrystallization temperature to the extent of about 15° or 30° and makes the recrystallized grain size remarkablly larger. (2) While for each alloy containing more than 0.2% of Ti, the variation of the preliminary annealing temperature has little effect on the recrystallization temperature and on the recrystallized grain size which was fairly fine and almost constant against the change of annealing temperature as well as cold reduction of more than medium degree. (3) Recrystallization diagrams for these alloys have been proposed with respect to the content of Ti and the variation of the preliminary annealing temperature.View full abstractDownload PDF (604K) -
Nobuteru Awa, Osamu Fusida1957 Volume 21 Issue 7 Pages 447-449
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSFor improving the of ununiformity of thickness of the film in chromium plating a frame may be set around a cathode plate.By this method the cathode become the centre of new the cathode plate and the frame becomes the edge of the new cathode. The effects of this frame method are as follows: By this frame method the uniformity of the plating film thickness was much improved. As the result of experiments, the frame C was found most effective, followed by frame B,frame A and frame D in the order named. When the plating film centre is 5 μ, at the center, it was Ca. 4 μ at the around periphery. This tendency was improved by marking the contact area smaller. This improved method is effective for chromium plating of block gauges.View full abstractDownload PDF (427K) -
Shigeo Wakamatsu1957 Volume 21 Issue 7 Pages 450-453
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSA new spectrophotometric procedure has been developed for the determination of tin in iron and steel. The procedure is based on the reaction of quinalizarin with stannic ion in ammonium acetate buffer solution of pH 3.0 to 3.3. The relation between the absorbance and the amount of tin conforms to Beer’s law at 550 mμ in the concentration range from 1 to 200 (γ) of tin using 10 mm cell. Tin was separated from large amount of iron by CO-precipitating with manganese dioxide. The precipitate was dissolved in hydrochloric acid and hydrogen peroxide, and tin was easily determined spectrophotometrically with quinalizarin. The method requries only 30 minutes after sample dissolution.View full abstractDownload PDF (556K) -
Tomonori Sakano1957 Volume 21 Issue 7 Pages 454-457
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn the previous reports, the relationship between the process of peritectic reaction and the relative position of the three phases on the peritectic line has been determined. The author’s object in this report is to observe in detail the manner of each phase (e.g. primary, secondary, ternary) in many peritectic structures and to examine the relationship between the form of this reaction and the relative position of the three phases on the peritectic line. As the result, it was found that furnace cooled structures of all peritectic alloys are classifiable according to the relative position between the three phases, i.e., by whether the ‾LS⁄‾SP value in more or less than unit, and gradually vary under some fixed rule. This is based on the difference of the forms of the peritectic reaction. This report concerns the result of the ‾LS>‾SP peritectic system.View full abstractDownload PDF (926K) -
Tomonori Sakano1957 Volume 21 Issue 7 Pages 457-461
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSFollowing the 3rd report, the relationship between the relative position of the three phases “L,S,P” on the peritectic line and the features appearing on the ‾LS≤‾SP peritectic structure was examined. As the result, it has been ascertained that the form of the process of the peritectic reaction shows the peculiarity to the peritectic structure and the appearance of the structure varies with the change of ‾LS⁄‾SP value under some fixed rule.View full abstractDownload PDF (945K) -
Shôzo Yoshioka, Tôru Imura, Mitsuo Mera, Yutaka Nakayama1957 Volume 21 Issue 7 Pages 461-465
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe characteristics of the percussion figures on single crystals of aluminium and copper were studied at room and high temperatures. First, the proper conditions to make the figures were surveyed to get the best experimental data. Needles of the top angles of 45° for aluminium and 30° for copper gave the best results. Next, the orientation relationship between the patterns developed and the crystal surface was examined. According to the surface orientation of crystal, petaloid figures and several kinds of slip traces were observed in general, and the latters are interpreted as being the surface traces of the usual slip planes {111}, and there were always observed three or more traces of equivalent planes (max. 4 when the usual slip systems of face-centered cubic metals, i.e. {111}-⟨110⟩ are operative). Using these three directions of slip traces, the orientation of a crystal can be easily determined by means of crystal globe, even in the case of comparatively a small crystal grain.View full abstractDownload PDF (891K) -
Hideo Nishimura, Tsuyoshi Hiramatsu1957 Volume 21 Issue 7 Pages 465-469
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe corrosion resistance, to the electrode potentials and its time-potential curves of α-or β-solid-solution binary titanium alloys in 20% hydrochloric acid solution have been measured. The effects of addition of some elements in high strength forging alloys on the corrosion resistance and to time-potential curves in hydrochloric, sulfuric and oxalic acid solutions of different concentration at various temperatures were also examined. The following results have been obtained. (1) The effect of addition of various elements to titanium on the anti-corrosive properties varies quite remarkably by the added elements. (2) Those elements of I and II series in the periodic chart were less effective. On the other hand the addition of such elements like platinium, palladium, zirconium and molybdenium improves the corrosion resistance fo the titanium alloys. (3) The electrode potentials of the alloys whose corrosion resistances are inferior drops more rapidly at a certain time. The potentials after the dropping reach the same value in every alloys. (4) The addition of chromium to high strength forging alloy improves its corrosion resistance to sulfuric acid solution.View full abstractDownload PDF (685K) -
Hideo Nishimura, Tsuyoshi Hiramatsu1957 Volume 21 Issue 7 Pages 469-473
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe equilibrium diagram of the titanium-platinum system has been investigated in the whole range of the composition by metallographic examination, X-ray analysis, measurement of melting point, and differential thermal analysis. The diagram obtained from the experimental results is shown in Fig. 4. Three intermediate compounds (Ti3Pt), (TiPt), and (TiPt3) were found to exist. Among them the crystal structure of Ti3Pt is of β-walfram type, and TiPt3 is of face center cubic. An eutectic reaction\ ightleftarrowsLβ+Ti3Pt occurs at 43% platinum and 1310°, and an eutectic reaction L\ ightleftarrowsTi3Pt+TiPt3 at 68% platinum and 1320°, also an eutectic reaction L\ ightleftarrowsTiPt+TiPt3at 85% platinum and 1780°, and a peritectic reaction L+TiPt3\ ightleftarrowsγ (Pt) at approximately 95%platinum. An eutectoid reaction β\ ightleftarrowsα+Ti3Pt occurs at 12% platinum and 840°. The solubility of platinum in beta titanum is approximetely 30% at the eutectic temperature and 10% at 1000°, and the solubility of platinum in alpha titanium is 2% at the eutectoid temperature.View full abstractDownload PDF (1449K)
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