巻号一覧
17 巻, 4 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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廣根 徳太, 國富 信彦1953 年 17 巻 4 号 p. 157-161
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーThe internal friction of Ni3Fe is measured as a function of magnetization for different stages of superlattice formation by using transversal vibration of about 500 c.p.s. For every stage of superlattice formation, the relation of internal friction vs. magnetization shows one or two maximums. This behavior can be explained by considering that one maximum is due to the macroscopic and the other due to the microscopic eddy current. By using the theoretical conclusion on the microscopic eddy current as obtained in the previous paper, the detailed behaviors of experimental relations can be explained by considering internal stress which is closely related to the superlattice formation.抄録全体を表示PDF形式でダウンロード (724K) -
山本 博, 武井 英雄1953 年 17 巻 4 号 p. 161-164
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーThe present experiment has been carried out to ascertain the effect of various heat-treatments—annealing, quenching, tempering and austempering—on the modulus of rigidity in 0.58% C and 1.02% C steel wires. At the same time the electric resistance and hardness were measured for our information. For this purpose, we made use of tortion pendulum, potentiometer and Micro hardness tester.
The results obtained are as follows: (1) The modulus of rigidity in steel wire increases remarkably by annealing at the temperature between 150∼350°, which is the temperature of hardening in cold drawn steel wire caused by annealing. In this case, we can’t find any change in resistivity. (2) The modulus of rigidity in quenched steel wire is small, but it increases by tempering. The recovery of modulus of rigidity by tempering advances remarkably at the temperature between 250∼400°, which is the temperature of softening due to decomposition of martensite. (3) The relation between the modulus of rigidity and transformation temperature in austempering is fairly complex (see Figs. 5 and 6), and we got the maximum value of the modulus of rigidity by means of austempering at about 600°, the minimum at 100∼250°.抄録全体を表示PDF形式でダウンロード (659K) -
小柴 定雄, 西沼 輝美1953 年 17 巻 4 号 p. 165-167
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーAs the heat treatment of high carbon-high chromium magnet steel, the normalizing treatment followed by quenching is most important. The authors studied the isothermal transformation treatment of high carbon-high chromium magnet steel, and then ascertained the most moderate heat treatment from its isothermal transformation diagram of this steel. The results are summarized as follows: (1) The isothermal transformation diagram above 400° are determined. (2) The structure after normalizing from 1150° is of nearly perfect austenite, and which is stable for the at holding time of 8 hours under 400°. (3) The preheating temperature before quenching of 650∼700° is best adapted to the method of heating for quenching.抄録全体を表示PDF形式でダウンロード (577K) -
岡林 邦夫1953 年 17 巻 4 号 p. 167-171
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーThe author presents in this paper the observation on a fundamental study of metallographic features of cast iron treated by induction heating, in which some characteristic phenomena has been found. The results are as follows; (1) Martensite of cast iron by induction hardening is finer than that bydordinary quenching, and has super-hardness. (2) Short heating, owing to which lamella Fe3C can not diffuse sufficiently into austenite, is liable to produce a quenched lamella structure which has lamella Fe3C retained in very fine martensite matrix and is of high-hardness Cast iron, especially, is apt to have such a structure because of its high content of Si. (3) Considered as a kind of aperture, graphite in cast iron works on the high frequency current as notch, consequently the circumference of graphite is often subjected to over-heating. (4) It is found that there is a abnormal expansion of graphite in the hardening part, owing to short heating of the induction hardening. The degree of the expansion varies with shape and size of graphite. (5) It is necessary that the quantity of ferrite in matrix is as little as possible, because short heating prevents carbon from diffusing sufficiently. Therefore, a pearlite matrix is preferable.抄録全体を表示PDF形式でダウンロード (1379K) -
奥田 彌五1953 年 17 巻 4 号 p. 171-176
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーBy means of Inducting the equation of heat conduction and temperature distribution into the equation of continuity of fluids, the author introduced the velocity equation of molten metal in a cylindrical mould, and then calculated the moving distance of the molten metal at the centre in the mould and the acceleration of the molten metal in front of the solidifying layer. Their magnitudes depended upon the initial cooling conditions and pouring temperatures. The distribution of the contraction cavities and the situation of inversed segregation were now explained with their magnitudes.抄録全体を表示PDF形式でダウンロード (830K) -
萩原 久人1953 年 17 巻 4 号 p. 176-179
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーThe reduction equilibrium of sulphur in molten tin by hydrogen was studied in the temperature range of 800∼950°. It is concluded that sulphur in molten tin may be regarded as an ideal solution within the limit of experiment. Experimental results are summarized as follows:
(This article is not displayable. Please see full text pdf.)
By combining the dissociation equilibrium of hydrogen sulphide with the above results, the following results were obtained:
(This article is not displayable. Please see full text pdf.)
Measurements of the equilibrium of Pb-Sn-S alloys with mixtures of hydrogen sulphide and hydrogen at 800° were also made. At this temperature, tin was found to increase the activity of sulphur in molten lead but this effect is very small.抄録全体を表示PDF形式でダウンロード (498K) -
森永 卓一, 位崎 敏男, 堀 茂1953 年 17 巻 4 号 p. 179-183
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーThere is no doubt that the properties of metals and alloys are not unconcerned with the pressure applied to them during the solidification. However, we have almost no concrete knowledge to conclude on the effects of pressure on the properties of metals and alloys, because this problem has previously been given little attention by the reason that its effects are not remarkable in practice. The authors have investigated the effects of pressure on the properties of low melting alloys and some aluminium alloys by means of mechanical and microscopic examination, and observed in many alloys marked changes in structure and a remarkable improvement in mechanical properties. From these results, we have received the impression that effects of pressure must not be disregarded simply or estimated as negligible in some cases.抄録全体を表示PDF形式でダウンロード (873K) -
今井 弘, 堀 一夫1953 年 17 巻 4 号 p. 183-187
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーThe castability is the most important quality for castings and it depends on many factors. But these factors are too many and too complicate to study. In this study, the factors are classified in two, shrinkage and fluidity. Thus, stadies were carried out about these factors separately and at the same time synthetically.
In this paper, we report about the solidifying shrinkages, especially on the relation between the solidifying shrinkage and the composition of Al-alloys.
The apparatus used was a thermo-balance by Prof. K. Honda and all specimens were prepared with 99.998% pure Al and other mother alloys. The following facts were cleared up: (1) The quantity of volume change about Al and its alloys have been determined and showed the effects of these alloyed elements for volume changes. (2) The former explanation for volume change is not sufficient and it needs more study to clear up the true causes. (3) The following facts are picked up from the above results to promote more study: (a) Pure metals solidify at constant temperature but show a larger volume change than in other alloy-systems. (b) In alloy-systems, the quantity of volume change decreases from binary to multiple system in general. (c) The sorts of primary crystallization are one of the factor which affect the quantity of volume changes. (d) The quantity of volume change is different by the sorts of the alloyed elements and its effects depend less on the range or the form of solidification than on movement of alloyed elements themselves in the alloy. It would be understood by the physical quality as the melting point.抄録全体を表示PDF形式でダウンロード (769K) -
市川 理衞1953 年 17 巻 4 号 p. 187-190
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーThe orientation and grain size of pure Mg, Mg-Al, Mg-Zn, and Mg-Mn alloys which were severely deformed and annealed at 640°C (pure Mg) or for 1∼12 hours at the temperature just beneath the solidus line (Mg alloys) were studied by investigating the microscopic structure and by X-rays analysis. Results obtained were as follows: Coarsening grains were observed in pure Mg and Mg-Al (Al 3.1%) alloy. The inclination of hexagonal axis [0001] to the direction of working came near to 90° and [112\bar0] axis went nearly parallel to the direction of working for the grain of coarsening. In Mg-Al (Al 6.0%) and Mg-Zn alloys, recrystallized grains grew gradually. In Mg-Mn alloys, the orientation obtained by deformation was scarcely changed by annealing.抄録全体を表示PDF形式でダウンロード (662K) -
乾 忠孝, 松尾 茂樹1953 年 17 巻 4 号 p. 191-194
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーWe got the following results’ in our experiments on bronze plating in oxalate bath: (1) Current-density-voltage curves of the Cu plating differ according to the metalion concentrations and the temp. of the bath, but current-density-voltage curves of the Sn differ very little. (2) Current density-voltage curves of the bronze differ very little according to the metal ion concentrations and temp. of the bath, but they are peculiar to the bronze plating and very different from those of pure Cu of Sn plating. (3) The Cu contents of the deposites are increased as the metal ions are increased, and the values of Cu/Sn increase hyperbollically aginst the metal ion concentrations of the bath. (4) The values of Cu/Sn increase hyperbollically against the temp. (5) The deposites are rich in Cu at low current density and the values of Cu/Sn decrease as the current densitrises. They are related hyperbollically with each other.抄録全体を表示PDF形式でダウンロード (658K) -
後藤 秀弘, 渡邊 四郎1953 年 17 巻 4 号 p. 194-197
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーThe suitable concentration of acids and other conditions in ferrous-permanganate method after oxidation with persulfate for determination of Mn in ferromanganese were studied and the following results were obtained. (1) Acid concentration; Using 4 g of (NH4)2S2O8 in total volume 400 mL, Mn of 4∼28 mg was determined in the concentration range of 1.4∼2.6 N H2SO4, 0.6∼1.0 N mixed acid of H2SO4 and HNO3 (3:1). (2) Boiling time; The time of boiling of the solution for oxidation of Mn by (NH4)2S2O8 using AgNO3 was permitted till 5 min after decomposition of surplus persulfate. In above acid concentration, boiling for more than 6 min caused the decomposition of permanganic acid. (3) Influence of H3PO4; Using about 2 g of (NH4)2S2O8 in total volume of 200 mL, the amounts of H3PO4 added must be increased with the increase of Mn content. But when the total volume is made to 400 mL and 4 g of (NH4)2S2O8 are used, the addition of too much of H3PO4 would be useless. (4) The suitable procedure for the determination of Mn in ferromanganese was established and the analysis were carried out with several samples, and good results were obtained.抄録全体を表示PDF形式でダウンロード (500K) -
若島 久男1953 年 17 巻 4 号 p. 198-200
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーIt is said that the degree of temper brittleness of special steel varies in wide range, although their chemical composition is nearly the same. This phenomena is not yet recognized in detail, and also must depend upon the nature of temper brittleness. In this paper the present author proved the variety of temper brittleness of structural special steel (Ni-Cr, Cr, Ni-Mn steel), in the following items. (1) The difference of the degree of temper brittleness in the outer and inner parts of large ingots of Ni-Cr steel, (2) the influence of phosphorus upon the temper brittleness of Ni-Cr steel, (3) the degree of temper brittleness of low phosphorous Ni-Cr, Cr, and Ni-Mn steel. The degree of temper brittleness of Ni-Cr steel is larger in the inner part than the outer part, although the segregation of C, P, S etc. are hardly recognized in any positions. The influence of phosphorous on temper brittleness of specil steel had been examined by many other experimenters. In the same manner as these experiments, our experiments indicated the strong effect of phosphorus on the temper brittleness of Ni-Cr steel. Lastly, it is mentioned especially that the degree of temper brittleness of low phosphorous Ni-Cr, Cr, Ni-Mn steel is much lower than the so-called temper brittleness of steel.抄録全体を表示PDF形式でダウンロード (452K) -
河内 利平1953 年 17 巻 4 号 p. 200-204
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーOn the commericial α brasses and bronzes, the effect of grain size (measured at the testing condition) on the elongation at elevated temperature is reported. It is clearly seen that this effect is very great and the temperature range of brittleness found on the specimen with large grains diminishes as grain size becomes smaller. The addition of small amount of chromium as inhibitor to grain growth in 70-30 brass increases greatly the elongation at high temperatures.抄録全体を表示PDF形式でダウンロード (664K)
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