巻号一覧
21 巻, 9 号
選択された号の論文の13件中1～13を表示しています
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大槻 太1957 年 21 巻 9 号 p. 525-528
発行日: 1957年
公開日: 2008/04/04
ジャーナル フリー(1) In the earlier stage of heating, the percentage of H2 in the evolved gas is larger than that of CO, but later on CO gradually comes to occupy the larger part. (2). CO/CO2 grows larger as the temperature rises. (3) The diffusion coefficient of CO in nickel was measured at 890∼970° and the formula D=3×105exp(−76,000⁄RT) cm2 sec−1 was obtained. (4) The evolution of CO from nickel in the experiment is caused by the diffusion of oxygen in nickel.抄録全体を表示PDF形式でダウンロード (466K) -
吉田 亨1957 年 21 巻 9 号 p. 528-531
発行日: 1957年
公開日: 2008/04/04
ジャーナル フリーIn this paper the author studied the relation of the residual stress and the deformability in carburized steel. All the specimens were case-hardened by carburizing, were indented by using a steel ball (φ6 mm) and the residual stress of the sections was measured by using a wire-strain gage or a profilometer. As a general rule radial cracks grew on the specimens which retained tension stress in the surface while circular cracks were found on the specimens with residual compression stress, and the deformability of the surface which grew radial cracks was lower than that of the surface with circular cracks. Therefore it is expected that the load carrying capacity of a bearing is influenced by the difference of its deformability.抄録全体を表示PDF形式でダウンロード (719K) -
大和久 重雄, 飯島 一昭1957 年 21 巻 9 号 p. 531-535
発行日: 1957年
公開日: 2008/04/04
ジャーナル フリーTo clarify the transformation phenomena of steel below Ms temperatures during isothermal transformation treatment and isothermal treatment during tempering, named isothermal tempering, the authors have investigated the electric resistivity, the microstructure, the dilatation during transformation and the mechanical properties of steel specimens during such a treatment. The results obtained were as follows: (1) In isothermal transformation treatment below Ms temperatures, the untransformed Austenite→Bainite transformation occurs, and its beginning and finishing times are placed on extrapolated curves of the values obtained over Ms temperatures in TTT-diagram. (2) The authors have found that the retained Austenite→Bainite transformation occurs isothermally during tempering,and its beginning and finishing times coincide with those obtained by isothermal transformation treatment. (3) Steel samples isothermally transformed below Ms temperatures are superior in toughness to the isothermally tempered and conventionally quenched-and-tempered ones, provided that their hardness is equal.抄録全体を表示PDF形式でダウンロード (797K) -
大竹 正, 石崎 敬三, 江口 直記1957 年 21 巻 9 号 p. 536-540
発行日: 1957年
公開日: 2008/04/04
ジャーナル フリーIn order to investigate the influences of tramp elements contained in steel and of heating conditions upon the surface fissures of hot-worked steel products, hot-bending tests were performed paying special attention to the depth of scaling. The results obtained were as follows: (1) There is a certain critical value of scaling for surface fissures to occur, and over this value cracks increase with the increase of scaling. (2) The critical value of scaling increases as the heating temperature is raised and the tramp elements decreased. (3) The tangent of the curve of crack severity number versus scaling loss of a sample (%) increases as the heating temperature is raised and the amount of the tramp elements increased. (4) When Sn content in steel is 0.03%, there is a linear relationship between the crack severity number and (Cu% in steel × scaling loss of a sample (%)). When Sn content exceeds 0.03%, the curves rise steeply at first and then gradually. (5) The heating atmosphere affects the fissures indirectly through scaling loss, but the scaling velocity has some effects when it is extraodinarily large or small. (6) The relative effects of Sn on the fissures are usually of about the same as that of Cu, but vary with its content and the heating temperature. The relative effects of As on the fissures is about 1/4 of that by Cu. (7) Ni and S have an effect towards decreasing of fissures, and in our experiment the fissures were totally prevented by Ni%/Cu%=1.6.抄録全体を表示PDF形式でダウンロード (790K) -
西岡 多三1957 年 21 巻 9 号 p. 540-544
発行日: 1957年
公開日: 2008/04/04
ジャーナル フリーIn diesem Bericht wurde der Einfluss geringer Zugabnahme bis herauf zu etwa 10% beim Ziehen auf die Restspannungsverteilungen in Stahldrähten untersucht. Nämlich luftpatentierte Stahldrähte mit ganz kleinen Restspannungen sowie luftpatentiert-gezogene Drähte mit Druckspannungen im Kern und Zugspannungen in den Randzonen wurden mit geringer Zugabnahme gezogen. Danach bei sehr geringer Zugabnahme traten beide im Kern Zug- und im Rande Druckspannungen auf, die bei Zugabnahme von 0.7% höchstenwaren, bei etwas stärkerer Zugabnahme war es umgekehrt, und bei der Zugabnahme von mehr als 7% traten eben im Kern Druck und im Rande Zugspannungen auf. Ein gezogener Stahldraht wurde ferner in einem Zuge durch die erste Düse mit 25% iger Zugabnahme und die zweite mit geringer Zugabnahme oder einige Düsen mit geringer Zugabnahme gezogen, dann die Restspannungen verminderten sich mehr als beim Ziehen durch eine Düse mit geringer Zugabnahme. Und ich ermittelte, dass der mit geringer Zugabnahme gezogenen Draht, der also niedrige Spannung hatte, zeigte höhere Dauerfestigkeit als der gewöhnlich erzeugte Stahldraht.抄録全体を表示PDF形式でダウンロード (675K) -
岡本 正三, 岡田 千里1957 年 21 巻 9 号 p. 544-548
発行日: 1957年
公開日: 2008/04/04
ジャーナル フリーThe paper presents data of solid solution hardening, work hardening recrystallization softening temperature and oxidation resistance for Ni-binary solid solution. The samples made from Mond nickel(99.85%) with metallic additions of highest grades by means of a Tammann furnace melting were used for the above examinations, the results being as follows: (1) The alloying elements were as listed hereunder in order of decreasing potency of solidsolution hardening in water quenched alloys; Ti,Si,Mo,Al,Mn, Cr, W,Fe,Cu and Co. (2) The solidsolution hardening is caused by the distortion of Ni-lattice, so that the greater the difference in atomic radius between the added element and Ni,the greater the hardening effect. (3) The less the hardness of alloy before cold-working, the greater the work-hardening effect, that is, the larger the amount of the alloying element and the greater the difference in atomic radius between the added element and Ni, the less the work-hardening effect. (4) In most cases the softening temperature is raised by the increase of the amount of alloying elements,especially by small amount of Ti- or Al-addition. The softening temperature is raised up to 800° in the alloys with above 10% of Mo, above 15% of W or above 18% of Cr, while it is lowered by Cu-addition. (5) The oxidation resistance is generally reduced by alloying elements, especially by Fe or Mo, but Cu or Si scarcely affects it. In alloys with above 10% of Cr the oxidation resistance is extremely improved.抄録全体を表示PDF形式でダウンロード (705K) -
嵯峨 卓, 宮川 大海, 幸田 吉三1957 年 21 巻 9 号 p. 548-551
発行日: 1957年
公開日: 2008/04/04
ジャーナル フリーWe had discussed in the previous papers on the oxidation of aluminum-coated steel at elevated temperature. The resistant properties to oxidation and growth of aluminum-coated cast-irons (gray and white iron) coated by means of hot-dip process have been investigated. The obtained results were as follows: (1) The alloy layers on cast-iron formed during hot-dipping are far thinner than those on low carbon steel and the flake graphites of gray cast-iron still remained in the alloy layer in the same state as before dipping. (2) The weight increase due to the oxidation and the increase of length by the growth of coated gray cast-iron is about 80% and 60% less than that of uncoated gray cast-iron, respectively. (3) In white cast-iron the weight increase can be reduced to about 10% by coating, but on its growth no remarkable effect of coating is observed. (4)The cast-iron containing 22%Cr is more resistible to growth than coated cast-irons, but in the resistance against oxidation coated white cast-iron shows superior properties to this alloyed cast-iron. (5) The thickness of alloy layers seems to have no great effect on the resistant properties of coated cast-irons.抄録全体を表示PDF形式でダウンロード (1020K) -
柿田 八千代, 細谷 稔, 天野 実1957 年 21 巻 9 号 p. 551-554
発行日: 1957年
公開日: 2008/04/04
ジャーナル フリーExperiments were carried out on the rapid determination of about 4 per cent of aluminium contained in diecasting zinc alloy without applying any separating procedure and a new method has been proposed. After zinc, iron, copper, cadmium and other elements contained in it which are coprecipitated with aluminium by oxine were masked with potassium cyanide and magnesium was also masked with EDTA to eliminate their interference, aluminium was directly precipitated by oxine and then determined gravimetrically or volumetrically by bromometric titration. It was found that a large excess of potassium cyanide was desirable to get good results on the determination of aluminium by this method, because a small portion of zinc cyanide complex was decomposed by oxine in excess.抄録全体を表示PDF形式でダウンロード (435K) -
大河原 謙二1957 年 21 巻 9 号 p. 555-557
発行日: 1957年
公開日: 2008/04/04
ジャーナル フリーIn the previous studies on the secondary recrystallization of straight rolled Al single crystal, it was found that the specimen in which the coarsening phenomenon was observed had always a fine grained structure with a high percentage of primaries in one preferred orientation. In the present study, using cross rolled Al single crystals(99.996% purity) the author investigated the change of the structure during the rolling and annealing process by etch pit method. Comparing the results with those of straight rolling, the author found that the orientation change was smaller, the primary texture was not in one preferred orientation and the coarsening of grain was not observed after 600°×2 hr annealing even in(111)orientation specimen. From the above results, the author considers that the fiber texture in one preferred orientation made by rolling and annealing plays an important role for the coarsening phenomenon of the single crystal.抄録全体を表示PDF形式でダウンロード (858K) -
多賀谷 正義, 堀 眞市1957 年 21 巻 9 号 p. 558-561
発行日: 1957年
公開日: 2008/04/04
ジャーナル フリーIn an alkaline solution (pH 11.3, 0.008%NaOH) severe anodic corrosion of lead suddenly begins at 160 mV nobler than the natural potential of lead in the same solution. The current density at this point is 2 mA/dm2. In dilute sulfuric acid solutions (pH 1.3,2.8) anodic corrosion slowly occours from 100 to 2000 mV nobler than the natural potential in these acid solutions on account of PbSO4 coating. The flow-out current density in this range is 10 mA/dm2 or fess. In the next step PbO2 is formed on the anodic surface and anodic corrosion decreases on account of O2 evolution at the current density of 20∼80 mA/dm2. For the cathodic protection of lead in these alkaline and sulfuric acid solutions, the optimum electrode potential and the flow-in current density are −200 mV and 2∼6 mA/dm2. Overprotection exceeding this limit may cause cathodic corrosion of lead by accumulated alkali.抄録全体を表示PDF形式でダウンロード (587K) -
楠本 健次, 太田 陸奧雄, 小西 愛海1957 年 21 巻 9 号 p. 561-565
発行日: 1957年
公開日: 2008/04/04
ジャーナル フリーThe precipitation process in Ag-AgMg alloy system, the nature of precipitates found after various heat-treatments of quenched Al-AgMg(9,10%) alloys and the structure of the compound AlAgMg were studied mainly by X-ray methods. The results obtained are as follows: (1) Although it was reported by Ohtani that this alloy system is a pseudo-binary system, it actually is a section of a ternary system. (2) The intermetallic compound AlAgMg reported by Ohtani is a Laves phase of MgZn2 type structure of which the probable formula is Mg (Ag1.03Al0.97). (3) The main precipitates are AgMg,and their orientation with respect to the matrix is [110]P\varparallel[2\bar1\bar1]M and [2\bar11]P\varparallel[110]M. (4) G.P.Zones were not found.抄録全体を表示PDF形式でダウンロード (777K) -
野里 僚一1957 年 21 巻 9 号 p. 565-569
発行日: 1957年
公開日: 2008/04/04
ジャーナル フリーThe aging process at room temperature was studied by tracing the specific heat-temperature curves of various alloys containing 4,5,6,8,12 and 15 wt%Sn. (1)In the alloys of higher concentration than about 8%Sn, the heat of resolution of tin into solid lead (Q cal/mol) increases to its final value in two stages with aging time t. The rate of the 1st stage could not be obtained. On the other hand, the kinetic law for the 2nd stage seems to be represented as follows ; p=K\sqrtt+C, where p is the precipitation fraction given by the ratio of the heat of resolution Qt at aging time t and the heat of resolution Qf at the final time of aging. K and C are constants determined by the constituent of the alloy. The value of the rate constant, K, decreases with decrease of tin content, and seems to become zero at about 6%Sn. (2) The specific heat temperature curves of the alloys attaining equilibrium at room temperature cannot be explained by the solubility curve given in the literature.抄録全体を表示PDF形式でダウンロード (727K) -
佐野 幸吉, 蓑輪 晋1957 年 21 巻 9 号 p. 569-572
発行日: 1957年
公開日: 2008/04/04
ジャーナル フリーThe solubility of nitrogen in Fe-V,-Si,Cu,-Ni and-Cr-Ni molten alloys was measured at 1600°, under the pressure of 160 mmHg and 760 mmHg and from the results obtained the effect of alloying elements on the activity coeff.of nitrogen in molten iron was calculated by the following relation : logf_N=logC_N^O-logC_N
At low V-concentration, the solubility of nitrogen was given by Sievert’s law approximately.
In Fe-Ni-Cr molten metal, the activity coeff.of nitrogen can be calculated by fN=fNCr×fNNi from the known fNCr and fNNi of binary alloy.抄録全体を表示PDF形式でダウンロード (564K)
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