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Volume 21, Issue 5
Displaying 1-17 of 17 articles from this issue
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Hiroshi Asada, Kichizo Koike1957 Volume 21 Issue 5 Pages 309-312
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe successive structural changes along the extruded length and the transverse directions of the extruded product are caused by several factors such as, the temperature of extrusion, the deformation ratio, the speed of extrusion, the condition of lubrication concerned with the shape of the die and Mn or Cr content. It is clear that such structural behaviors originate from the factors of cold-working during the hot-working, and these relations coincide with the relation between the recrystallization temperature and the extrusion conditions that have been pointed out in the 3rd report. Consequently, in the process of extrusion of aluminium alloy, some effects of the cold-working factors are unvoidable. Then, the structure of extruded product is sensitively affected by the distribution and the amount of residual stratin.View full abstractDownload PDF (772K) -
Tadao Satô, Toshio Saitô1957 Volume 21 Issue 5 Pages 312-316
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe material and the bearing quality of Pb-Ca-Ba-Na and Pb-Sb-Sn-As alloys were studied and the following results have been obtained. At first, difficulties were experienced in the melting and casting process of each alloy, but in the operation of the lining proccess, a large bearing was manufactured with less difficulties of casting than white metals. In each metallic structure, segregation and grain growth of crystals were not observed. The alloys with Brinell hardness number lower than 30 showed good affinity and anti-frictional quality to lubricant oil. The hardness of the each alloys could be controled through increase and decrease of additional element, thus saving the consumption of tin. So the material and the bearing quality of these bearing alloys were found to be more excellent than those of JIS, WJ 6, 7, 8 and 9 alloys.View full abstractDownload PDF (685K) -
Tadao Satô, Toshio Saitô, Kazuo Ôyama1957 Volume 21 Issue 5 Pages 316-320
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe material and the bearing performance of Cu-Pb alloys (Kelmet) were studied and the following results have been obtained. For Diesel engines mounted on motor cars, Kelmet of Copper dendritic structure has been often used. In the present experiment, the alloys of lead granular structure were tested. The former is generally hard with B. H. N. 35∼40, while the latter is soft with B.H.N.28∼32.8. Casting and lining operation of these alloys were comparatively easy, and large bearing were manufactured without great difficulty in casting. In this experiment Kelmet showed adequate ability of lubrication, antifriction and endurance under the present practice of lubrication as half-bearing used on the axle boxes of cars. So, Cu-Pb alloy may be substituted for white metal (WJ 6,7,8 and 9) from the sandpoint of saving tin consumption and on account of its excellent endurance.View full abstractDownload PDF (861K) -
Tohru Yokoyama1957 Volume 21 Issue 5 Pages 321-324
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn the thermo-electromotive force versus temperature curve, when the ordered specimen is heated from room temperature, the thermo-electromotive force value suddenly decreases at 550°,and gradually from 550° to 730°. In the thermal expansion coefficient versus temperature curve, the thermal expansion coefficient suddenly reaches the maximum at 730°, then it decreases as the temperature goes down, but shows a distinct increase in a small degree at about 550°. In X-ray investigation, it has been discovered that FeCo alloy has body-centered cubic lattice in all the ranges of the process of superlattice formation. In the lattice constant versus temperature test by X-ray analysis at high temperature, it has been discovered that changes take place at 550° and 730°, and these changes correspond to the total expansion diagram. When FeCo alloy is quenched from higher temperature than 730°, it shrinks abnormally on the way of quenching process.View full abstractDownload PDF (712K) -
Tohru Yokoyama1957 Volume 21 Issue 5 Pages 325-329
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIt has been discovered that in two-step-quenching the origin of the so-called 550° change occurs not only at 550° but also at a temperature considerably lower. On the measurement of ordered degree by a Geiger-counter X-ray diffractometer, it has been proved that FeCo alloy begins to be ordered at 730°, and the ordered degree suddenly increases at 550°. And this phenomenon corresponds to the presumption based on the results of measurements of all the other properties.View full abstractDownload PDF (652K) -
Tomonori Sakano1957 Volume 21 Issue 5 Pages 329-333
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSRegarding the peritectic reaction, few fundamental researches, especially microscopic and systematic investigations are found. We cannot say that the perfect process always takes place on the peritectic reaction (L(Liquid)+P(Solid)\ ightleftarrowsS(Solid)), for it is the heterogenous reaction which occurs between the liquid and the solid. In fact, it frequently shows in the binary or ternary peritectics that the grain-refined structure results as its ideal process and the so-called peritectic structure in which the primary is enveloped by the secondary, results as its imperfect process. The author’s object in this article is therefore to examine these different appearances, and to understand metallurgically the reason for this phenomena from the diagramtical point of view. This report regards the relationship between the process of the peritectic reaction and the relative position of the three phases on the peritectic line, on the occasion of the LS/SP type’s binary system.View full abstractDownload PDF (1136K) -
Hisafuji Watanabe1957 Volume 21 Issue 5 Pages 333-337
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe author have studied the phase diagram of the system Al-Zn-Cu (especially in the range of Al-Zn side). The diagram obtained by means of inverse rate thermal analysis, electric resistance measurement and microscopic observation is shown in Fig. 10, and four non-variant points are observed in this diagram.
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Toshio Doi1957 Volume 21 Issue 5 Pages 337-340
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe specimens were prepared from vacuum-melted alloys, of high purity vacuum-melted copper and electrolytic chromium. The liquidus and eutectic point were determind by thermal analysis. The eutectic temperature is 1074.8° and its composition is 1.28 wt% of chromium. The determination of solid solubbility of chromium in copper was made by microscopic observation and electrical resistivity measurement. The solubility of chromium in solid copper is 0.6 wt% at 1050°, 0.4 wt% at 1000°, 0.25 wt% at 950°, 0.17 wt% at 900°, and 0.10 wt% at 840°.View full abstractDownload PDF (598K) -
Shôsuke Imoto, Genjiro Mima1957 Volume 21 Issue 5 Pages 341-344
Published: 1957
Released on J-STAGE: April 04, 2008
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Tomo-o Satô, Hideo Kaneko, Eizo Osonoi1957 Volume 21 Issue 5 Pages 345-349
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSCarbide reactions in following three chromium steels after isothermal transformation have been studied by measuring electrical resistance and Curie points of carbides.
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During the isothermal transformation of these steels, θ-phase carbide containing low Cr is formed, and it dissolves Cr to equilibrium content after the transformation. In steels B and C, the saturated θ-phase changes its form by carbide reaction as listed in the next table.
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Ichiji Obinata, Kensuke Kurihara, Yô Takeuchi, Rokuro Kawanishi1957 Volume 21 Issue 5 Pages 349-353
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSObserving the process of solidification of molten aluminium droplets in water and examining also the structures and properties of the solidified granules, it has been shown that if molten aluminium or its alloys are cast into thin mould set into hot water, the ingot having homogeneous equiaxed structure may be obtained. This process of casting is named as “Subaquatic Casting” process or briefly “S.A.C. process” by the present writers. In the 1st report, macrostructures of the ingots made of Al, Al-1.2Mn, Al-4.5Cu and Al-5Mg alloys by S.A.C. process in the laboratory scale has been shown and the effect of casting conditions, that is casting temperature, pouring rate and the temperature of water, on the macrostructures have been pointed out. From the results of examination it is concluded that if suitable casting conditions may be choosen, the macrostructures of ingot by S.A.C. process is always homogeneous and no columnar crystals may be seen irrespective of the sort of alloys. The cause of formation of such homogeneous structure during the solidification in S.A.C. process has been discussed and attributed it to the homogeneous cooling effect due chiefly to the latent heat of vaporization of hot water.View full abstractDownload PDF (1019K) -
Ichiji Obinata, Kensuke Kurihara, Yô Takeuchi, Rokuro Kawanishi1957 Volume 21 Issue 5 Pages 353-357
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSPhysical, chemical and mechanical properties of the ingots of aluminium as well as of its alloys obtained by S.A.C. process have been measured and compared with those obtained by chill casting. Results obtained may be summarized as follows: S.A.C. ingots have always finner grain-structure and smaller tendency for dendritic crystallization than chill ingots, especially in the case of pure aluminium. No marked difference in the specific gravity and electrical resistance have been detected between S.A.C. and chill ingots. Attenuation of ultrasonic waves of S.A.C. aluminium ingot showed smaller value than the chill ingot, showing the soundness of the former. Contents of hydrogen, alumina and magnesium in S.A.C. ingots were almost equal to those in chill ingots and the tendency for inverse segregation of copper in S.A.C. ingot was not conspicuous S.A.C.2S ingots showed larger tensile strength, elongation and resistance to deformation than chill ingots, though the difference was not marked in the case of aluminium alloys.View full abstractDownload PDF (705K) -
Ichiji Obinata, Hiroshi Tanaka1957 Volume 21 Issue 5 Pages 357-360
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSCasting experiments have been carried out in order to obtain 2S slabs of practical size by S.A.C. process. The results of examination of the slabs showed that, if suitable casting condition may be choosen, the macrostructures of slabs are homogeneous, consisting of fine equiaxed grains and the difference in the mechanical properties due to the position of the test pieces taken in a slab is very small. Casting molten alminium into a thin walled copper mould set in hot water and drawing the bottom of the mould downwards gradually, long cylindrical 2S slabs, having the diameter of 60 mm and 135 mm respectively, have been obtained. Macrostructures of the slab cast thus continuously in hot water were also homogeneous and no columnar crystals, which may be observable in the slab of ordinary continuous casting method using water cooled mould, have been detected. The surface appearance of the slab by S.A.C. process was almost smooth and the existence of “bleeding band” was not conspicuous.View full abstractDownload PDF (973K) -
Yoshiro Yagi, Tôru Yukawa, Hidetake Kusamichi1957 Volume 21 Issue 5 Pages 360-363
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSTitanium base Ti-Al alloy is one of the most basic titanium alloys with the same crystal structure as pure titanium. We have researched into the microstructures and work hardening characteristics of cold-drawn pure titanium and of titanium base Ti-Al alloys containing 1 to 4%Al, and have obtained the results that, such a many twins can not be seen in the structure of the cold-drawn Ti-Al alloys like pure titanium and that the work hardening of Ti-Al alloys is much less than that of pure titanium. Next, we have observed the characteritics of softening by annealing and the recrystalization temperatures of these wires cold drawn at various degrees. For instance, in the case of 56% reduction, the beginning temperatures of recrystalization of pure Ti, Ti-1%Al alloy, Ti-2%Al alloy and Ti-4%Al alloy are at about 500°, 575°, 600° to 650° and 650° to 700°, respectively, when these wires are annealed for 1 hour.View full abstractDownload PDF (645K) -
[in Japanese], [in Japanese], [in Japanese]1957 Volume 21 Issue 5 Pages 364a
Published: 1957
Released on J-STAGE: April 04, 2008
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...1957 Volume 21 Issue 5 Pages 364b-365
Published: 1957
Released on J-STAGE: April 04, 2008
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[in Japanese], [in Japanese], [in Japanese]1957 Volume 21 Issue 5 Pages 365-366
Published: 1957
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSDownload PDF (276K)
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