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27 巻, 8 号
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本田 裕, 高橋 修一郎1963 年 27 巻 8 号 p. 357-365
発行日: 1963年
公開日: 2008/04/04
ジャーナル フリーAs a part of studies on the development of swaging process for fabrication of the UO2 fuel rod, energetics in swaging was dealt with mainly by investigation of temperature rise during the process. The temperature was measured by means of a thermocouple of Chromel-Alumel or Pt-PtRh which was inserted into UO2 powder in a container of stainless steel tube. Optical and electron microscopic observation and specific heat measurements were also carried out. The conclusions are summarized as follows.
(1) Preliminary heating of the sample results in a great deal of temperature rise; the rise is as high as 1680°C for hot swaging at 720°C, whereas it is about 170°C for cold swaging.
(2) Plastic deformation of UO2 and friction between UO2 particles are main causes for the heat generation. The former is dominant in hot swaging, and the latter in cold swaging.
(3) Excellent compactability of UO2 powder in swaging process is due to atomic diffusion activated both by the temperature rise and the stress during swaging.
(4) In hot swaging, most of working energy is consumed by plastic deformation of UO2, leading to a pronounced temperature rise, and a minor part of the energy is stored in UO2 as internal energy connected with lattice distortion and lattice defects.
(5) In cold swaging, friction between particles, fracture of particles, and lattice distortion play important roles in consuming the working energy. Since a considerable part of the lattice distortion during cold swaging is elatic, working energy for the elastic distortion of lattice is consumed by impact between die backer, and roll.
(6) Specific heat measurements show that some of the internal energy stored in cold swaged compact is released at the temperature range between 450°C and 900°C. The internal energy resulting from cold swaging is also demonstrated by the fact that bonding among particles in cold swaged compact become better after room temperature aging for several months.抄録全体を表示PDF形式でダウンロード (3810K) -
渡辺 勝也1963 年 27 巻 8 号 p. 365-369
発行日: 1963年
公開日: 2008/04/04
ジャーナル フリーTwo sets of experimental work were carried out to study the mechanism of fayalite formation.
(1) A fayalite pellet was sandwiched between a wustite and a vitreous silica rod. And a platinum wire as a marker was placed at the interface of wustite and fayalite. Thus arranged specimen was heated at 1150°C for 24 hrs in an argon. The marker was moved into the fayalite pellet and sinter pores in the fayalite were also moved to and accumulated at the interface of fayalite and silica. The vitreous silica was crystallized due probably to a mineralizing action of wustite transferred into the silica. According to an electron-probe micro analyis it was considered that the iron in silica was mainly located in the boundary of the silica crystals.
(2) Wustite powder and silica gel were mixed at the composition of fayalite and heated at 1000°C in vacuum for 10 to 600 min. The amount of fayalite formed and of wustite remained were determined by X-ray powder method. The rates of the formation of fayalite and of the reduction of wustite obeyed completely the parabolic rate low. The actual amount of the fayalite formed, however, was always lesser than that of the value calculated from the amount of wustite remained. This discrepancy seemed to be due to the presence of wustite acting as a mineralizer in silica.
The mechanisms of the mineralizing action of wustite and the formation of fayalite were dicussed.抄録全体を表示PDF形式でダウンロード (1976K) -
美馬 源次郎, 長谷川 正治1963 年 27 巻 8 号 p. 370-376
発行日: 1963年
公開日: 2008/04/04
ジャーナル フリーThe Cu-Si-Zn alloys in the composition near Cu 45 wt%, Si 5 wt% and Zn 50 wt% (γ solid solution) were investigated by means of thermal analysis and microscopic examination. A transformation of the γ solid solution, γ\ ightleftarrowsγ′, was found below 457°C in a range of the ternary system, and the transformation temperature lowers with decrease of Si content in the solid solution. This transformation may proceed by a diffusionless mechanism and the low temperature phase γ′ seems to have a distorted γ-brass type structure. The twin-like figure appeared in the γ′ phase of the slowly cooled specimens is attributed to the transformation from γ to γ′.
By measurements of electrical resistance of the alloys near the β solid solution, it was found that Si has little effect on the temperature of the order-disorder transformation in the β solid solution.抄録全体を表示PDF形式でダウンロード (3064K) -
斎藤 利生1963 年 27 巻 8 号 p. 376-382
発行日: 1963年
公開日: 2008/04/04
ジャーナル フリーThe ε phase formation range of various composition of quenched manganese steels has been investigated by dilatation test, magnetic test, and X-ray analysis. Transitional composition steels that the structure under quenched conditions were changed from simple α phase to simple γ phase has been shown two clear expantion at about 200°C and 500°C in thermal dilatation curves. Hitherto these phenomena considered that the retained austenite in steels were transformed to α at these two temperature ranges as same manner as Cr steels, but, in this work, a few anomalies were observed in the expantion at about 200°C in dilatation curves. Consequently, it was found that this expansion due to not only the simple retained austenite transformation, but the ε→γ transformation only, or the retained austenite transformation coincide with the ε→γ transformation. Steels, composition of 1%C and 2∼3%Mn, has been shown the two step transformation of retained austenite in both dilatation and magnetic curves, and on lowering the manganese content the steels has been transformed as same as plain carbon steel, and on increasing the manganese content the steels has been transformed only at higher temperature range. Manganese content that formed ε phase in quenched Fe-Mn alloys has gradually lowered with the increase of C content in steels, and its content ranges has changed to the narrow range by increasing carbon content, then, ε phase were formed in quenched conditions of 1, 0%C and 3∼4%Mn steels.抄録全体を表示PDF形式でダウンロード (3049K) -
奥 孝一, 田辺 伊佐雄1963 年 27 巻 8 号 p. 383-386
発行日: 1963年
公開日: 2008/04/04
ジャーナル フリーWe have observed of ferro-vanadium, by hot nitric acid extraction method, the form of non-metallic inclusions, relation between alloying elements and inclusions, and gas content. The results obtained were as follows.
(1) Non-metallic inclusion are in close connection with Al content: Inclusions are 0.5 to 0.2% and 0.05% respectively to the ranges of 0.19 to 1% and 1.4% to 2.5% of Al contents. The latter being lowest inclusions increase again incase of over 2.5% of Al content.
(2) Non-metallic inclusions are mainly B-Al2O3, the type of which are transparent board, dendrite, granular free crystal and spheric crystal.
(3) Oxygen content in ferro-vanadium is nearly corresponding to the one computed in inclusions and has the same tendency as inclusions in relation to Al content.抄録全体を表示PDF形式でダウンロード (1736K) -
金子 秀夫, 黄 燕清1963 年 27 巻 8 号 p. 387-393
発行日: 1963年
公開日: 2008/04/04
ジャーナル フリーInformations on the transformation behavior of titanium-base alloy during continuous cooling is extremely important for the development of the heat treatments procedure to provide specific mechanical properties. This paper summarizes the continuous cooling transformation diagrams of five kinds of titanium-base binary alloys, Ti-Mo, Ti-V, Ti-Nb, Ti-Al and Ti-Sn.
The specimens were soaked at a suitable temperature under an argon protective atomosphere prior to quenching, which was carried out by argon jet stream. Cooling curves were automatically drawn by recording temperature changes by an electromagnetic oscillograph. From these cooling curves, the continuous cooling transformation diagram was constructed for the respective titanium alloys.抄録全体を表示PDF形式でダウンロード (2297K) -
金子 秀夫, 黄 燕清1963 年 27 巻 8 号 p. 393-397
発行日: 1963年
公開日: 2008/04/04
ジャーナル フリーThe continuous cooling transformation diagrams of titanium-base alloys of allotropic transformation type have been reported by the present authors in the previous paper. In this paper are summarized the continuous cooling transformation diagrams of titanium alloys of eutectoidal type, such as Ti-Fe, Ti-Mn, Ti-Cr, Ti-Co and Ti-Bi.
The specimens were soaked at a temperature of β phase prior to quenching. Quenching was carried out by argon gas jet stream. During quenching, cooling curve was recorded by an electromagnetic oscillograph. Starting point and finishing point of β→α transformation, Ms point and Mf point have been determined from the cooling curves. From these measurements, the continuous cooling transformation diagram was constructed for the respective alloys.
The velocity of β→α transformation of titanium alloys tested decreases, in general, by the addition of an alloying element and the Ms temperature for the formation of α′ phase is almost linearly dependent on the content of alloying element. Dominant stabilization effects are operative above 5%Fe.抄録全体を表示PDF形式でダウンロード (1817K) -
金子 秀夫, 黄 燕清1963 年 27 巻 8 号 p. 398-402
発行日: 1963年
公開日: 2008/04/04
ジャーナル フリーThe continuous cooling transformation diagrams of titanium-base binary alloys of eutectoidal type have been reported by the present authors in the paper No. 1 of the same title. This paper summarizes the continuous cooling transformation diagram of five titanium alloys ; Ti-Pb, Ti-Ag, Ti-Pt, Ti-Cu and Ti-Ni. These alloys also belong to the eutectoidal type.
As the results of this experiments, additional elements have been classitied into the following two district groups through the difference in effecting the upper critical cooling velocity ;
(1) elements which decreas the critical cooling velocity ; V, Cr, Mo, Nb, Pt, Co, Sn, Zr.
(2) elements which increase the critical cooling velocity ; Cu, Ag, Pb, Bi, Al, Fe, Mn, Ni.抄録全体を表示PDF形式でダウンロード (1956K) -
金子 秀夫, 黄 燕清1963 年 27 巻 8 号 p. 403-406
発行日: 1963年
公開日: 2008/04/04
ジャーナル フリーThe continuous cooling diagrams of sixteen titanium-base binary alloys have already been reported by the present authors in three reports. This paper deals with some considerations on the experimental data contained in these previous reports.
Ms curves of titanium alloys do not coincide neither with α(α+β) boundary lines nor with β−(α+β) boundary lines.
To curves can be obtained experimentally by measuring Ms and βs points. On the other hand, they are able to be calculated thermodynamically by Kaufman’s equation. Both methods were applied to Ti-Mo and Ti-V alloys and the results were found to be in good agreement.抄録全体を表示PDF形式でダウンロード (1138K) -
大日方 一司, 竹内 庸, 川西 六郎, 青木 重夫1963 年 27 巻 8 号 p. 406-413
発行日: 1963年
公開日: 2008/04/04
ジャーナル フリーEs wird hier die statische Reaktion von Titan und den im Luft geschmolzenen Metallen wie Aluminium, Zink, Zinn, Wismut und Blei behandelt. Die Abnahme der Titanprobedicke, das Wachstum der Deckschichten auf Titan und die Härte der Diffusionsschichten wurden gemessen, und auch das Angriffsgefüge des Titans wurde mikroskopisch beobachtet. Gegen alle untersuchte Metallschmelzen ist Titan wesentlich unbeständig. Die Angriffsfähigkeit ist jedoch je nach dem Metall gross unterschieden, zwar wird Titan durch die Aluminium-, Zink- und Wismutschmelzen sehr heftig angegriffen, während die Verträglichkeit des Titans mit den Zinn- und Bleischmelzen ist bei niedriger Temperatur verhältnismässig klein. Infolge der Reaktionen von Titan und den Metallschmelzen treten in den Deckschichten auf Titan sehr verschiedene intermetallische Verbindungen auf, deren genaue Strukturen sowie Zusammensetzungen jedoch in diesem Bericht noch unklar bleiben. Eine diesbezügliche Untersuchung soll dann weiter fortgsetzt werden, besonders in Berücksichtigung des Einflusses von Sauerstoff auf derartige Reaktion. Es wird allerdings erfordert, den Versuch nicht im Luft wie hierliegende Arbeit, sondern unter Schutzgas oder im Vakuum durchzuführen.抄録全体を表示PDF形式でダウンロード (2991K)
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