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Volume 24, Issue 5
Displaying 1-18 of 18 articles from this issue
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Masao Kanamori, Shôji Ueda, Shintarô Matsuo, Hiroshi Sakag ...1960 Volume 24 Issue 5 Pages 265-268
Published: 1960
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe relationships between cooling rate, structures and mechanical properties in slowly cooled 9.7/4.7/5.3 cast nickel aluminium bronze are described. The relation between the proof stress depending on the rate of cooling, and the number of κ phases in unit area N is discussed. The following formula is approximately true and this relation could be explained in dealing with the nickel aluminium bronze as a precipitation-hardening alloy. σ_s \fallingdotseqK\sqrtN K: constant, N ≥1View full abstractDownload PDF (643K) -
Masao Kanamori, Shôji Ueda, Shintarô Matsuo1960 Volume 24 Issue 5 Pages 268-271
Published: 1960
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSSome of the fundamental problems on the corrosion behaviour of Cu-Al-Ni-Fe cast alloys in sea water are decribed. The types of deposit or pitting corrosion and electrochemical properties/composition relationships are discussed. A comparison of electrochemical properties and behaviours against erosion damage of other marine propeller alloys and the new nickel-aluminium bronze is also outlined.View full abstractDownload PDF (728K) -
Isao Tanabe, Toshio Toyota, Hisao Konno1960 Volume 24 Issue 5 Pages 272-274
Published: 1960
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe disintegration of low-iron high-carbon Fe-Mn was studied. The results obtained are as follows; (1) High-carbon Fe-Mn becomes less stable against water and moisture with decrease of Fe contents in Fe-Mn alloys. (2) High-carbon Fe-Mn of less than 5%Fe disintegrates in wet air, but in the case of higher iron content than 5% it is stable. (3) Fe high-carbon Fe-Mn of less than 10%Fe is unstable in water, but in the case of higher iron content than 10%, it is stable. (4) The disintegration is considered to be caused by a reaction of Mn3C in high-carbon Fe-Mn with water or moisture, and the reaction of the disintegration in wet air is given by the following formulae
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Seita Sakui, Hiroshi Onoda1960 Volume 24 Issue 5 Pages 275-278
Published: 1960
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSConcerning the three kinds of conventionally used die-casting alloys (Mg-, Al- and Zn alloys), we have studied (a) the relation between the temperature of specimens that are ejected from the die and the shot numbers, and (b) the tensile properties and the impact value of specimen at room- and high temperature, with due reference to the shot numbers. By these investigations, the following distinctive features of Mg alloys were found in comparison with those of the other two alloys: (1) The temperature of dies has a strong influence on that of Mg-alloy castings. (2) The mechanical properties of Mg-alloy castings are inferior to those of Al- and Zn alloys. (3) The deformation of castings caused by the ejector pin is mildest in Mg alloys, judging from the strength of castings at high temperature and the casting temperature. (4) It was also ascertained that the heat-loss of the dies varies proportionally to the temperature of the dies.View full abstractDownload PDF (632K) -
Seita Sakui, Hiroshi Onoda1960 Volume 24 Issue 5 Pages 279-281
Published: 1960
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe movement of molten metal in die casting can be distinguished into the following two steps, i.e., (1) influx of molten metal through the gate, and (2) movement of injected metal in the cavity of die. As for the first, we studied the movement of plunger and the pressure thereon by application of proper apparatus and measurement with an oscilograph. As for the second, we observed the movement of radioactive lubricant, through which we could judge the movement of molten metal. The following is the report on the first step movement. Under constant injection speed, the injection pressure was the highest in Zn alloys and the lowest in Mg alloys. The coefficient of effluence slightly differed among the three alloys. In this experiment, also the distinctive features of Mg alloy die casting were exploved by observation of the movement of these three kinds of alloys.View full abstractDownload PDF (339K) -
Seita Sakui, Hiroshi Onoda1960 Volume 24 Issue 5 Pages 281-284
Published: 1960
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSWe studied the motion of molten metal in die cavity by using the lubricant containing the isotope 35S. It was found, by autoradiography of the castings, that the lubricant painted on the die surfaces is moved to a fairly great distance through the injected molten metal. The direction of the flow of melt could be estimated from the locality of 35S-containing-lubricant that was painted in the die cavity before the injection of molten metal, and that of 35S found adhering to the casting surfaces. The injected melt rebounded up to a fairly long distance after collision with the wall opposite to the gate. The rebound was larger in Mg alloys than in Al- and Zn alloys. Also, the adsorption of lubricant on the casting surfaces was quicken in the case of Mg alloys.View full abstractDownload PDF (572K) -
Masataka Sugiyama, Noboru Makino, Hitoshi Shidara1960 Volume 24 Issue 5 Pages 285-289
Published: 1960
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSRecently, alloy materials for resistance welding or commutators are required to stand operation under conditions of increasing severity. Copper alloys containing nickel and beryllium possess not only high electrical conductivity but also enough mechanical strength at elevated temperature consideration of these merits, nickel-beryllium-copper ternary alloys were studied in the authors’ laboratory. In this report, the results of basic experiments on the optimum composition and the effect of additional elements to the alloys are described. First, the specimens of nickel-beryllium-copper ternary alloys containing various quantities of nickel and beryllium were prepared to detect their optimum composition. The experiment showed that these alloys showed the most superior properties in the region of 0.2∼0.3%Be and 1.2∼1.5%Ni, where its hardness became more than 200 (Vickers numbers) and its electrical conductivity more than 50% (IACS). Moreover 5 kinds of metals including chrome, iron, zinc, aluminium and cobalt were added to the ternary alloy containing 0.14∼0.30%Be, and their effect on the mechanical and electrical properties was investigated. These additional metals gave an unfavourable effect on the electrical conductivity, but addition of chrome, iron and cobalt promoted age-hardening of this alloy.View full abstractDownload PDF (747K) -
Yosaburo Okura1960 Volume 24 Issue 5 Pages 289-293
Published: 1960
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn order to clarify whether the methanolic bromine method, proposed by the author, is suitable for the purpose of oxide separation or not, the behavior of individual inclusion components, commercial reagents or materials synthesized by the author was compared by treating them with methanolic bromine and iodine at ordinary temperature and at 60°C, respectively. The results show that crystalline or amorphous, silica and alumina, manganese sulfide, non-crystalline, iron oxides, and nitrides of aluminum and silicon, behave similarly in both methods, but manganese monoxide is more unstable in bromine than in iodine, solution and iron sulfide, nitrides of iron and manganese are more or less stable in iodine treatments, hence the iodine method is more subject to interference by these in the case of oxide determination than the bromine method.View full abstractDownload PDF (776K) -
Yosaburo Okura1960 Volume 24 Issue 5 Pages 293-295
Published: 1960
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe behaviors of individual inclusion components bromine and iodine solutions were again studied in comparison. The iron phosphide Fe2P in ferro-phosphorus is similarly refractory in both solutions, and may similarly interfere the FeO determination in residues, while iron carbide can be entirely dissolved and cause no interference. Then as tests for complex inclusions, some silicates, O.H. slag, and sintered ore were tested in comparison. Tephroit, one of the silicate ores, and the O.H. slag gave exceptionally low values in methanolic bromine at 60°C.View full abstractDownload PDF (446K) -
Yosaburo Okura1960 Volume 24 Issue 5 Pages 296-300
Published: 1960
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSAs the studies of various treating conditions of methanolic bromine solution and of the behaviors of various component inclusions in it in comparison with methanolic iodine solution have led to successful results, as described in the previous reports, in this last study the residues of twenty specimens of iron and steel in the shape of drillings or solid pieces were determined as oxides of silicon, aluminum, manganese, and iron, after treatment with the both solutions at ordinary temperature as well as at 60°C, respectively. From the above experiments, it was concluded that separation with 10% methanolic bromine solution at ordinary temperature is more suitable than iodine methods for separation of oxide inclusions in plain carbon steel containing less than 0.5%C, is more rapid and specific, and less expensive than any hitherto developed separation methods.View full abstractDownload PDF (851K) -
Tadao Nakajo, Nobuo Shiota, Mamoru Imabayashi1960 Volume 24 Issue 5 Pages 300-304
Published: 1960
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn practical use, it is often observed that the corrosion resistance of light alloys cannot be estimated only by the results of statical corrosion test. Although a number of investigators have studied the problem of corrosion of Al casting alloys, few systematical researches under different conditions have been carried out. In this report, statical and stress corrosion tests were carried out with 5%Mg-Al casting (AC7A), 10%Mg-Al casting (AC7B) and K.S. Seewasser alloys. The results obtained are summarized as follows: (1) AC7B alloy is superior to AC7A and K.S. alloys in the statical corrosion test. (2) When the stress is applied in a corrosive environment, AC7B is more prone to stress-corrosion cracking than AC7A and K.S. alloys. This tendency is promoted by the β-phase precipitation treatment. (3) Cathodic protection is effective for these alloys to prevent the stress-corrosion cracking.View full abstractDownload PDF (897K) -
Nobuo Shiota, Mamoru Imabayashi1960 Volume 24 Issue 5 Pages 304-308
Published: 1960
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn the previous report, the authors described the results of their study the statical and the stress corrosion of 5%Mg-Al casting (AC7A), 10%Mg-Al casting (AC7B) and K.S. Seewasser alloys. To estimate the corrosion resistances of these alloys in practical use, corrosion-fatigue and cavitation-erosion tests were carried out with AC7A and AC7B alloys. The results obtained are summarized as follows: (1) In atmosphere into which 3%NaCl solution was sprayed, the fatigue strength of AC7A and AC7B alloys decreased to almost one-half of the values obtained in ordinary atmosphere. (2) Although the tensile strength of AC7B alloy is superior to AC7A alloy, its fatigue strength in corrosive atmosphere is not superior. And in such an atmosphere, it was found that the fatigue strength of five specimens of AC7A alloy, which differ in foundry condition, is not correlated with their tensile strength,because the former is influenced by the gas occluded in them. (3) Of the specimens prepared under the same conditions, the erosion by magnetostrictive cavitation apparatus occurred almost in inverse proportion to the hardness number. (4) Comparing the erosion of AC7A alloy with that of AC7B alloy, no difference could be accurately determined.View full abstractDownload PDF (701K) -
Hakaru Masumoto, Hideo Saitô, Tatsuo Kôno, Yutaka Sugai1960 Volume 24 Issue 5 Pages 308-311
Published: 1960
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe influence of addition of 10, 20 and 30 per cent of nickel on the thermal expansion in the range from 20° to 50°C, the rigidity modulus at 20°C and its temperature coefficient in the range from 20° to 50°C of the alloys of cobalt, iron and molybdenum has been determined. The relations between those properties of nickel-added alloys and the concentrations are qualitatively similar to those in the case of the ternary alloy mentioned above, while with the addition of nickel, the minimum value of thermal expansion coefficient becomes smaller and the positive maximum value of the temperature coefficient of the modulus larger; the minimum value of expansion coefficient of 1.64×10−6 and the maximum value of positive temperature coefficient of the modulus of +71.7×10−5 were obtained with the alloy containing 7.5 per cent of cobalt, 1.5 per cent of molybdenum and 30 per cent of nickel. The addition of nickel affects these coefficients of the ternary alloy, as if cobalt can be substituted by nickel; that is, the composition, at which the expansion coefficient shows the minimum value and the temperature coefficient of the modulus the maximum positive value, shifts to the side of low cobalt content almost linearly with the increase of nickel content and finally reaches the same composition in the binary system of iron and nickel, quite molybdenum as in the case of the alloys of cobalt, iron and chromium and of cobalt, iron and vanadium. When the quantity of nickel is increased, the concentration range having the positive temperature coefficient of the modulus becomes wider, and the change of the latter corresponding to the change of the former becomes smaller, especially in the range containing higher molybdenum. Some elinvar-type alloys containing comparatively high molybdenum have values of rigidity modulus larger than 8×105 kg/cm2, showing an important characteristic for practical application.View full abstractDownload PDF (628K) -
Yunoshin Imai, Masuji Kumazawa1960 Volume 24 Issue 5 Pages 312-315
Published: 1960
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn order to elucidate the physical properties of titanium-carbide powder is fabricated by the method of arc melting and crushed by a stamp mill and a ball mill, the particle distribution and their size and shape were observed as the first step of the study. The following results were obtained: (1) The finest particles, which were sifted with an infrasizer and have the mean size of 0.1 μ increased up to 70 wt% under the air pressure of 0.2 kg/cm2 at the duration time of 18 hrs. (2) The largest particles which have the mean size of 15 μ, decreased to 4 wt% under the same condition (3) Particles having the angles of 60°, 90° and 120°C were observed by the electron-microscope. This means that the pulverization is preferantially effected along the (100) and the (111) planes of the crystal.View full abstractDownload PDF (645K) -
Kenzo Igaki, Shozo Tanimoto1960 Volume 24 Issue 5 Pages 316-320
Published: 1960
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe following findings are obtained by microscopic observation of the substructure in the zone-refined lead and tin. (1) The corrugation structure is observed only at the impure tail part of zone-refined bar. Coming nearer to the tail part, corresponding to the increase of impurity content, corrugation once appears and then disappears, this is repeated two or three times, and thereafter continuous corrugation takes place. (2) The effect of impurity concentration on the width of corrugation is rather complicated, sometimes widening and sometimes narrowing it down. As a general tendency, with the increase of impurity content the width of corrugation increases and after passing over a maximum value it continues to decrease till the appearance of dendritic growth. (3) Striation is observed in all parts of the bar, and it is not sensitive to the impurity content. (4) The striation boundaries are linear arrays of etch pits, possibly due to edge dislocations. (5) Banding does not coexist with corrugation structure and is observed only in portions of higher purity.View full abstractDownload PDF (985K) -
Toshiro Yamashina, Norio Sato, Haruo Kobayashi1960 Volume 24 Issue 5 Pages 320-324
Published: 1960
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSStudies have been made of the oxidation behavior of nickel-copper alloys containing 100∼68 wt% nickel. Tests were conducted at temperatures in the range of 725∼930°C, under 160 mmHg of oxygen, using a thermal microbalance, X-ray diffraction and metallographic techniques. The results were as follows: (1) Rate studies showed that the rate for 100∼85%Ni alloys could be interpreted in terms of the parabolic rate law. In the 68%-Ni alloy, the parabolic rate law served to interpret the rate data during the initial stages, but after 150∼200 min oxidation, deviations from the parabolic rate law were taken place. (2) X-ray diffraction studies showed that the oxide films on the 100∼85%-Ni alloys consist of almost pure NiO, regardless of the change in oxidation time and temperature. In the case of 68%-Ni alloy, NiO was the main oxide in the film, but Cu2O increased with the rise of temperature and the increase of oxidation time. The deviations from parabolic rate law in the 68%-Ni alloy occurred as a result of such a change in the oxide-film structure. (3) The relation between the oxidation rate and the oxygen pressure in the 68%-Ni alloy was investigated. (4) The theoretical analysis of selective oxidation of alloys proposed by C.Wagner was discussed.View full abstractDownload PDF (744K) -
[in Japanese]1960 Volume 24 Issue 5 Pages 325-328
Published: 1960
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSDownload PDF (620K) -
[in Japanese], [in Japanese]1960 Volume 24 Issue 5 Pages 328-330
Published: 1960
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSDownload PDF (434K)
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