巻号一覧
17 巻, 8 号
選択された号の論文の15件中1～15を表示しています
- |<
- <
- 1
- >
- >|
-
染野 檀1953 年 17 巻 8 号 p. 359-362
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーMeasurement of gas evolution from pure copper plate in vacuo gave the following results: (1) A large amount of gas evolved from copper plate polished by emery paper, which was caused by the polishing powder embedded on the surface of the copper plate, so it is desirable to polish such plates electrolytically but not with emery paper. (2) The amount of oxygen in commercial, vacuum-melted and deoxidized copper was determined by low pressure combustion method, and the relation between the oxygen content and the amount of gas evolved from three sorts, of copper plates was examined: the amount of gas evolved from vacuum-melted copper was smaller than that of commercial and deoxidized copper. When these plates were given hydrogen treatment, the amount of gas evolved from vacuum-melted copper and deoxidized copper containing very small amount of oxygen, was as small as that plate of no hydrogen treatment, but that from commercial copper, which contained a large amount of oxygen, was very large. (3) The activation energy of hydrogen diffusion through copper was measured as 32 kcal per g mol. (4) The mechanism of degassing oxygen-rich copper plates which subjected to hydrogen treatment was discussed.抄録全体を表示PDF形式でダウンロード (673K) -
田邊 良美1953 年 17 巻 8 号 p. 363-367
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーIn this paper, the two kinds of precipitations in ferrite and cementite of iron or steel are described. These precipitations were observed by means of an electron microscope. (Reference Photo. 1 to Photo. 8).
With these precipitations the following results were obtained by metallurgical considerations with respect to C, Si, Mn, P, S, N and O in iron or steel. (1) Ferrite contains many spherical precipitations, most of which are Fe3Si2 particles. (2) Fe3Si2 particles are about 550 Å in average. But this size grows in proportion as the Si content in iron or steel increases, and then they group with other kinds of particles. (3) Fe3Si2 particles are precipitated in a field of γ solid solution and their distribution is dense at the grain boundary but not in the interior of the crystal grains. (4) Cementite is a combination of Fe3C and Mn3C. (5) Spherical particles of MnSi are precipitated in a very small quantity from cementite. They are about 400 A on the average. (6) Growth of pearlite cementite is partially disturbed by the Fe3Si2 particles. (Reference Photo. 8). (7) As compared with ferrite of plain carbon steel, silico-ferrite contains much more Fe3Si2 particles.抄録全体を表示PDF形式でダウンロード (1381K) -
今井 勇之進, 熊田 健三1953 年 17 巻 8 号 p. 368-371
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーThe cause of the so-called 475° brittleness of high chromium steels has not yet been determined. To study this phenomenon, the hardness, thermal expansion, electric resistance, thermal magnetic analysis, tensile test, and microstructure of high chromium steels which contain chromium 15∼35%, were studied. At the neighbourhood of 500°, the hardness and also the tensile strength increase, reduction of area, decrease in elongation and expansion is observed, electric resistance and magnetic intensity decrease, magnetic transformation point shifts to high temperature with holding time and no clear difference of microstructure is seen between the long annealed specimen at about 500° and a specimen not so annealed, but the former shows a clearer grain boundary etching. From these experimental results, it is concluded that this phenomenon is not caused by the usual precipitation but the formation of a superlattice.抄録全体を表示PDF形式でダウンロード (664K) -
本間 正雄1953 年 17 巻 8 号 p. 371-374
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリー(1) The elimination of dissolved oxygen by carbon in cast iron melt is of importance in super-heating of cast iron. The decrease of carbon and the increase of silicon content by super-heating are not important to understand the super-heated melting. (2) The super-heated fine graphite structure is caused by super-cooling of melt accompanied by deoxidation, not by solution of graphite nucleus.抄録全体を表示PDF形式でダウンロード (698K) -
本間 正雄, 橋本 雍彦1953 年 17 巻 8 号 p. 375-378
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーThe experiments were performed by melting in CO atmosphere of Tammann furnace under the temperature between 1200° and 2000°. With the rise of melting temperature, the graphite structure of the specimens is refined and such changes are analogous to that of the structure changes caused by reducing slags at 1350° melting. At low melting temperature, the structure is varied by specimens, but at the temperature of super-heated melting, fine granular graphite structure appears regardless of the chemical composition of specimens.抄録全体を表示PDF形式でダウンロード (833K) -
岡林 邦夫, 二川 和正1953 年 17 巻 8 号 p. 378-382
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーUsing Cu-Mg (10%) alloy and pure Mg, the graphitization phenomena of white cast irons treated with Mg were investigated. The results were as follows. (1) The graphitization time of white cast irons is shortened with small amounts of residual Mg, because of the strong effect of Mg on the deoxidation and desulphurization of the molten irons and on the contrary, the graphitization time is prolonged with increasing amounts of residual Mg in white cast irons, because of the retarding effect of Mg on the graphitization. Especially, the graphitization of white cast irons with a large content of S is promoted remarkably when treated with Mg. It is believed this phenomenon is caused by the strong desulphurization of the molten irons. The retarding effect of Mg on the graphitization of white cast irons with a large content of Si is not so clear. (2) With increasing amounts of residual Mg in white cast irons, temper carbons become smaller and roundish or spherulitic in form and are remarkably increased in number. (3) With increasing amounts of residual Mg in white cast irons, areas of pearlite in the matrix of specimens, graphitized completely and furnace-cooled, are increased under microscopic examination. Especially, this tendency was remarkable in the case of white cast irons treated with Cu-Mg alloy as Mg.抄録全体を表示PDF形式でダウンロード (875K) -
齋藤 昇, 大槻 太, 本山 華久樹1953 年 17 巻 8 号 p. 382-386
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーWe measured gased from an iron plate evaporated with aluminium in vacuum, we obtained the following results: Carbon monoxide from iron plates decreases in inverse proportion with the thickness of aluminium and coating 0.005 mm of aluminium on an iron plate, 0.04% in carbon content and 0.12 mm in thickness, only hydrogen was diffused and 90% of the CO diffussion was stopped. The thicker the iron plate is and the more carbon it contains, the less becomes the stopping effect of the aluminium coating of the thickness mentioned above.抄録全体を表示PDF形式でダウンロード (752K) -
齋藤 昇, 大槻 太, 本山 華久樹1953 年 17 巻 8 号 p. 386-390
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーWe obtained the following results with regard to gases from Al-clad-Fe plates: (1) The volume and the composition of gases from Al-clad-Fe plate are not different from those of the gases from iron evaporated with aluminium or from pure aluminium, but very much different from those from iron. The volume of gas from Al-clad-Fe plate is about 2 cc/100 g and 90% of the gas is pure hydrogen. (2) Heating Al-clad-Fe plates at a higher temperature, some of aluminium evaporates and it shows gettering action. (3) When heated at a lower temperature or neither silicon nor other impurities is contained in aluminium, the blackness of the surface of Al-clad-Fe plate is obvious. (4) When an Al-clade-Fe plate is practically used as the anode of a vacuum tube, the properties of Al-clad-Fe are satisfactory and the character istics of the tube are very good.抄録全体を表示PDF形式でダウンロード (753K) -
Kyukichi Shimba, Sadakichi Kitajima1953 年 17 巻 8 号 p. 390-393
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーPDF形式でダウンロード (715K) -
Takuichi Morinaga, Shigeo Muromachi, Masao Yamada1953 年 17 巻 8 号 p. 394-396
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーPDF形式でダウンロード (417K) -
室町 繁雄1953 年 17 巻 8 号 p. 397-401
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーThe phenomenon of the “inverse segregation” in Al alloys, especially in duralumin ingots is well known, but the mechanism of the phenomenon is not clear yet, and so, the author made an investigation on the said phenomenon. Specimens were prepared from Al-Cu (4%) ingots which were melted and crystallized in a mould cooled on one side (Fig. 1). From the cooled plane to the other side of the ingots, the hardness of each grain was measured using a micro-hardness tester, and chemical analyses and microscopic determinations were made. Similar experiments were carried out with Al-Si and Al-Cu-Si ingots. Between the chill and columnar layer of the ingots, the auther has found a minimum in Cu content and also in the hardness of the α phase, and the position of this minimum point (Fig. 7) differs from that hitherto known. This minimum point moves towards the inside of the ingot with the increase of cooling rate. The occurrence of this minimum point seems to be explained by the theory of super-cooling. Besides, the auther has found a maximum in Cu content and also in the hardness of α phase at the end of the columnar layer, and moreover, it has been found that two kinds of dendrites having different hardness occur at the same end of the columnar layer (Fig. 8). These phenomena may be explained by the volume contraction theory, that is, the volume contraction due to the rapid solidification acts to attract the residual melt of high concentration, and the melt crystallizes there into dendrites of high concentration and also into eutectics.抄録全体を表示PDF形式でダウンロード (1134K) -
今井 勇之進, 今井 彦太1953 年 17 巻 8 号 p. 402-407
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーFollowing the preceding two papers, this paper describes the results of mechanical tests on several series of 0.15∼0.20% C, 1.0% Cr, 0.3∼0.7% Cu-steels containing boron, tested in normalized or hardened and tempered conditions. In the normalized condition, all these series of steels did not show any effects of boron-addition. But in the hardened and tempered condition of several steels, such as condaining 0.15∼0.20% C, 1.0% Cr, 0.3∼0.5% Cu, boron is revealed as a very useful element; i.e., the max. and yield stresses are enhanced in the degree of 15∼25 kg/mm2, the reduction of area and the elongation are not decreased, only the results on impact tests indicate slight decrease, but their values are rather high in view of their high max. and yield stresses. Mn-additions, in the order of 0.5∼2.0%, to these steels, are not so effective in either the normalized or the heat-treated condition. In the carburizing tests of these steels, the results also indicated very desirable features. From the results above mentioned, these steels are more suitable as structual low-alloy steels, or as the carburizing steels, than low-grade Ni-Cr steels.抄録全体を表示PDF形式でダウンロード (958K) -
小川 喜代一1953 年 17 巻 8 号 p. 407-412
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーA systematic investigation on the wear of nodular cast iron has hardly ever been heard of. This work was carried out for inspecting the wearing mechanism by means of lubrication or slide-weating of various kinds of nodular cast iron and then for comparing the result with that of ordinary pearlite cast iron. According to the work, the wear of the nodular cast irons becomes considerably different according to their structures; the less the magnitude of ferrite around graphite, the greater becomes the resistance to wear, and the specimen of which the matrix in structure is wholly pearlite with no ferrite shows the least wear. Compared to the ordinary cast iron, in this respect the specimen of which the structure consists entirely in pearlite in the matrix shows a slightly better resistance against wear, but when the structure consists in bull’s eyes it is worse. That cast iron having higher hardness and less elongation is superior in resistance to wear is contrary to the request of mechanical properties generally demanded. Deducing from observations of the worn surface, the thermal resistance of nodular cast iron would be high. Again, alloying iron with phosphor improves the resistance to wear but in a different tendency. Inspecting the breakage mechanism of the worn surface of high phosphor cast iron, the mechanism was found to differ from that of ordinary cast iron. After the specimen run for a long period provided that only oxidation wear carried out, that the wear phenomena appears as in mixed of bright surface wear and fusion wear is recognized.抄録全体を表示PDF形式でダウンロード (1012K) -
廣根 実？, 神垣 知夫1953 年 17 巻 8 号 p. 412-416
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーAttenuation of the ultrasonic waves propagating in aluminium rods under various heat treatments were measured for a wide range of frequency (2-25 mcps). Pulsed longitudinal waves were emitted into the rods and the transmitted pulses were detected by a crystal on the back surface of the specimen. Measurements of the attenuation of the sound waves were carried out by the compensation method using an attenuator at the in-put side of the receiving amplifier. The purity of the specimen used was 99.4%. The specimen was firstly subjected to cold work and then annealed at 600°C for 5, 10, 5 and 25 hours successively. On the basis of these measurements it was found that the decay of transmitted waves was characterized by exponential attenuation. For the specimens of long time annealing, however, patterns of a number of irregular reflections were observed, as will be shown in Photos. 2 and 3. The emergence of such irregular echoes is supposed to be due to the multiple reflections of ultrasonic waves on the grain boundaries rigidly formed by the successive annealing.抄録全体を表示PDF形式でダウンロード (748K) -
堀 一夫1953 年 17 巻 8 号 p. 416-419
発行日: 1953年
公開日: 2008/04/04
ジャーナル フリーIt is well known that the castability depends on many different factors and also many researches on these factors have been reported. The reported methods are valuable in laboratory but in practical works, they are too difficult to utilize. In fact, it is necessary to judge the many factors affecting the castability at the same time and synthetically in factories, Finary, this problem is solved when the casting is practically carried out but it is economically impossible to solve it theoretically. Accordingly, instruments are desable that slow the defects based on many factors macroscopically with less materials and with accuracy. Many types of test moulds were designed and examined practically by the author and a quite original test mould was perfected. This test mould revealed a good capability in jadging the castability of 18 aluminium casting alloys and has been put to practical use in many factories and laboratories in Japan.抄録全体を表示PDF形式でダウンロード (643K)
- |<
- <
- 1
- >
- >|