All issues
Volume 36, Issue 7
Displaying 1-16 of 16 articles from this issue
- |<
- <
- 1
- >
- >|
-
Hiroshi Tanaka, Etsuji Kimura, Akio Yamaguchi, Joichiro Moriyama1972 Volume 36 Issue 7 Pages 633-637
Published: 1972
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe thermodynamic properties of UO2-ThO2 solid solution of compositions (UyTh1−y)O2+x with y values of 0.295 to 0.048 and x values below 0.029 were determined by emf measurements. The oxygen concentration cells were of the type
(This article is not displayable. Please see full text pdf.)
and operated in the temperature range 900 to 1050°C.
From the emf values and these temperature dependence, partial molar free energies, enthalpies and entropies of solution of oxygen in the solid solutions were calculated.
Between these partial molar quantities and the mean valence of U ion in the solid solutions, there exist correlations which are nearly independent of the values of y. These results suggest that the non-stoichiometry of UO2-ThO2 solid solution is similar to that of UO2+x.View full abstractDownload PDF (1604K) -
Mitsunori Sato, Masayuki Hijikata, Ichiro Morimoto1972 Volume 36 Issue 7 Pages 638-642
Published: 1972
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSSilver, silver-nickel and silver-carbon alloys containing chlorine, bromine and iodine which were added in the form of silver halogenide were prepared by sintering in a vacuum at 950°C. The characteristics of erosion resistance, welding resistance and contact resistance of these contacts have been measured under the conditions of 40 and 100 volts in applied voltage and 10 to 38 amperes in alternating current.
The characteristics of these silver base contacts changes by the additions of silver halogenide as follows. For silver and silver-carbon contacts the characteristics are improved, most remarkably by the addition of silver chloride; both erosion resistance and welding resistance increase, and the contact resistance decreases. On the other hand, for the silver-nickel contacts the deterioration of the characteristics is found as a result of the formation of nickel halogenide on the contact surface. Since the roughness of the contact surface which arises from erosion can also be considerably reduced, the contact is kept stable by these additions.View full abstractDownload PDF (1373K) -
Kazuhiko Asano, Akira Fujiwara1972 Volume 36 Issue 7 Pages 642-647
Published: 1972
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe effects of the tool dimensions, specimen diameter and the depth of cut on the chip formation characteristics of 2011 (T3) aluminum alloy have been investigated. It has been shown that the chip-treatability can be successfully interpreted in terms of the number of chips, N, produced when a constant amount of materials (100 g in the present work) is cut. At a high cutting speed, N decreases steeply and then increases again with increasing feed. It has been observed that continuous type chips are produced in the specific range of feed, termed the critical feed, at a certain higher cutting speed. Thus plotting N as a function of feed, there appears a discontinuity.
It has been shown that N increases with increasing back rake angle and more markedly with decreasing side rake angle, showing a strong dependence of the free-machining property on the tool dimensions. The effects of the back rake angle and the side rake angle on the machinability are particularly strong when the feed is near the critical value. The specimen diameter and the depth of cut have been shown to have little effect on the free-machining characteristics.View full abstractDownload PDF (1717K) -
Kimitaka Sato, Yoshio Uzuki1972 Volume 36 Issue 7 Pages 648-656
Published: 1972
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSWith a view to improving the rapidity and precision of X-ray fluorescence analysis of briquetted iron ores, a comparison was made of the natures of surfaces of briquetted samples prepared by a newly proposed dry grinding method using graphite powder as a binder and by three conventional methods, viz. a dry grinding method using no binder, a wet grinding method using stearic acid powder and a wet grinding method using polystyrene-maleic acid powder as a binder. An electron probe microanalyzer and a scanning electron microscope were used in this investigation. The results obtained are as follows:
(1) The new graphite grinding method is more suitable for the minute grinding of iron ores than other grinding methods and can produce iron ores with a uniform particle size of 1 μm under.
(2) By grinding through the graphite grinding method, iron ore powders are readily prepared into briquet after grinding, thus shortening the time necessary for briquetting.
(3) The internal standard (Co2O3) is uniformly and homogeneously dispersed in the briquet prepared by the graphite grinding method, compared with other grinding ones.
(4) Calibration curves exactly became simple for the important components in iron ores, that is, total Fe, CaO, SiO2, Al2O3 and MgO by adopting the graphite grinding method.
(5) Repeatability and precision (σd) were improved by the graphite grinding method. For example, σd was 0.43 for total Fe and 0.05 for CaO.
As mentioned above, the graphite powder has the grinding effect as a solid lubricant by the use of the graphite grinding method, so that the briquet obtained becomes uniform with improvements in repeatability and precision. The graphite grinding method is also suitable for the analysis for process control.View full abstractDownload PDF (2922K) -
Morihiko Nakamura1972 Volume 36 Issue 7 Pages 657-662
Published: 1972
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIt is well known that plastic deformation at the tip of a notch or defect influences the brittle fracture in structural steels. Recently the C.O.D. (crack opening displacement) concept has begun to be applied for the brittle fracture initiation of low and medium strength steels. So, it is though important to investigate the influence of the condition at the tip of a notch on the brittle fracture initiation of steel. The effect of pre-loading on the fracture strength was studied, using notched specimens of low strength structural steel (SM 50).
Standard Charpy V specimens were pre-loaded up to a general yield load by 3 or 4-point loading and then broken by 3 or 4-point loading at various strain rates at liquid nitrogen temperature. The influence of pre-loading appeared in specimens which had been pre-loaded so that their notched surface might be subjected to tensile stress, and their fracture loads tended to increase with pre-loading. However, specimens which had been pre-loaded so that their notched surface might be subjected to compressive stress, was not influenced by pre-loading apparently. The above-mentioned facts seem to indicate that the residual stress as well as the plastic deformation at the root of a notch influence the fracture strength of the notched specimens.View full abstractDownload PDF (1791K) -
Yoshiichi Sakamoto1972 Volume 36 Issue 7 Pages 663-668
Published: 1972
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSInternal stress in chromium electrodeposited from chromic acid solutions and its relationships to crystal structures and preferred orientations of electrodeposits have been investigated as a function of bath temperature. The internal stress in the hcp type deposit obtained at low temperatures is small but increases with bath temperature. When bcc type chromium is deposited in coexistence with the hcp type deposit, the internal stress attains a maximum in bright bcc type chromium with the ⟨111⟩ preferred orientation which is deposited in a low concentration of chromic acid. In the case of a higher concentration of chromic acid, the internal stress also attains a maximum in semi-bright mixtures of bcc and hcp type deposits, when the ⟨00·1⟩ orientation is predominant in the hcp type deposit. With increasing bath temperature, bcc type chromium becomes a mainpart of the deposits and both the internal stress and the preferred orientation again decrease.View full abstractDownload PDF (1532K) -
Taichi Kamijo, Kazuyoshi Sekine, Yasushi Matsukawa, Nobuo Noguchi1972 Volume 36 Issue 7 Pages 669-673
Published: 1972
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSVariations of the rolling and annealing textures through the thickness of aluminum sheets rolled 95 pct under conditions of high friction between the sheet and the rolls have been studied by determination of X-ray pole figures for various layers.
The rolling texture did not show a gradual change from the (001)[\bar1\bar10] surface texture to the pure-metal type inner texture, but the thin transition layer divided the sheet into two layers. The (001)[\bar1\bar10] surface rolling texture penetrated from the surface to a depth of 30 pct of thickness.
The recrystallization textures of the surface layer mainly consisted of eight orientation components obtained by rotating the (001)[\bar1\bar10] component by ±45-deg. rotations around the ⟨111⟩ axes. There were also two minor components corresponding to 15-deg. rotations around the [001] axis parallel to the sheet normal.View full abstractDownload PDF (1950K) -
Shinya Komatsu, Minoru Yonehara, Zensaku Kozuka1972 Volume 36 Issue 7 Pages 674-679
Published: 1972
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSTo estimate the ion transport number, tion, of ZrO2(+CaO) solid electrolytes at low oxygen partial pressure, pO2, the electromotive force of following cells was measured in the temperature range from 800 to 1000°C.
(This article is not displayable. Please see full text pdf.)
tion at low pO2 can be written as,
(This article is not displayable. Please see full text pdf.)
\ oindentwhere A and ΔQ are constant. p\ominus, the oxygen partial pressure where the tion is 0.5, is related to the temperature as,
(This article is not displayable. Please see full text pdf.)
Calculating from the experimental results, the value of p\ominus is represented as
(This article is not displayable. Please see full text pdf.)
showing very small difference with the concentration of CaO.
The value of ΔQ and its physical meanings are discussed. The calculated value of ΔQ for ZrO2 (+15 mol%CaO) from the activation energy of ionic diffusion and electron conduction agrees well with experimental values of other investigators.View full abstractDownload PDF (1767K) -
Hakaru Masumoto, Kiyoshi Watanabe1972 Volume 36 Issue 7 Pages 680-685
Published: 1972
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSCrystal structures and magnetic properties of Rh-Mn-Sb alloys have been investigated by means of X-ray and magnetic analysis. It has been found that a C1b type alloy exsists near the stoichiometric composition in the Rh-Mn-Sb system. Rh0.90Mn1.20Sb0.90 and Rh1.10Mn1.10Sb0.80 alloys with a crystal structure of the C1b type have lattice parameters of about 6.145 and 6.170 Å at room temperature, saturation magnetizations of 79.5 and 75.0 emu/g at absolute zero, magnetic moments of 3.19 and 3.29 μB per Mn atom at absolute zero, and Curie temperatures of 325 and 350°K, respectively. Moreover, the reciprocal magnetic susceptibility of these alloys has been found to satisfy the law of Curie-Weiss above the Curie temperature.View full abstractDownload PDF (1316K) -
Kazumi Shimotori, Mitsuo Kawai, Hirokazu Tokoro1972 Volume 36 Issue 7 Pages 685-692
Published: 1972
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSAs a basic knowledge of high-Cr-Ni-base superalloys, the precipitation hardening behaviors of 40Cr-Ni alloys containing various amounts of Al or Ti are studied experimentally. Their hardness, X-ray and microscopic examinations are made after various aging treatments at 700, 800 and 900°C. By the addition of Al or Ti, the duplex precipitation of γ′ or η and α-Cr is observed. Because of this duplex precipitation, for example, the hardness of 40Cr-3.8Al-Ni alloy increases to the maximum hardness of about Hv 680 in the aged condition from about Hv 200 in the solution-treated condition. These extremely high age-hardenabilities are analytically discussed from the viewpoints of γ′ phase hardening and α phase hardening.View full abstractDownload PDF (1820K) -
Hajime Suto, Toshihiro Kudo1972 Volume 36 Issue 7 Pages 693-701
Published: 1972
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe annealing structure of heavily drawn patented 0.72%C-steel wire has been examined by means of transmission and extraction-replica electron microscopy and X-ray line broadening, and differential thermal dilatation and thermo-magnetic analysis were carried out. From these observations, it was indicated that the annealing process of heavily drawn pearlite was devided into three steps as follows: (1) 75∼175°C; short range rearrangement of dislocations takes place (so-called elastic after effect) and internal strain decreases slightly. (2) 175∼400°C; fibrous cemenntite decomposes partially, dislocations are locked by the dissolved carbon atoms, and the internal stress between cementite and ferrite is released. (3) Above 400°C; the cementite particles are globurized and grown, the ferrite matrix recrystallized, the dislocation density decreases remarkably, and the fibrous structure disappears.View full abstractDownload PDF (3529K) -
Katsutoshi Ono, Yoshihiro Imamura, Akio Yamaguchi, Joichiro Moriyama1972 Volume 36 Issue 7 Pages 701-704
Published: 1972
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe dissociation equilibrium curves in helium have been determined for Fe2O3-CuO-Cu2O-Fe3O4 system at temperatures between 500 and 1200°C by means of thermogravimetry.
The CO-CO2 mixtures have also been employed to study the relations between oxygen pressure and composition for the system Fe3O4-Cu2O-Cu-Fe at 830°C.
The data have been used to establish a phase diagram of the Fe-Cu-O system.View full abstractDownload PDF (1081K) -
A Study of Hydrogen Induced Plastic Strain of Iron Single Crystal by the Divergent X-Ray Beam MethodKazuyoshi Kamachi, Sakae Hamamoto, Masakazu Muta1972 Volume 36 Issue 7 Pages 705-711
Published: 1972
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSHydrogen induced plastic deformation of iron single crystals was studied by the back reflection divergent X-ray beam method. Pseudo-Kossel patterns were taken from the crystals that were charged cathodically by hydrogen for various times, the crystals aged at room temperature, and those annealed at 180, 350, 550, 650 and 750°C for 10, 30 and 60 min. The depth of crystals strained by hydrogen was determineded by the same method, taking X-ray patterns from the electrolytically eliminated surface succeedingly.
At the earliest period of cathodic charging, misfit angles of mosaic brocks were expanded and lattice irregularities occurred. The lattice constant increased with charging time and approached a saturated value, the total change of lattice constant being about 0.2%. After the annealing treatment in vacuum, strained crystals were poligonized.View full abstractDownload PDF (2896K) -
Etsujirô Yajima, Tôru Miyazaki, Toshihiko Sugiyama, Hiroo ...1972 Volume 36 Issue 7 Pages 711-719
Published: 1972
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSMetallographic changes were investigated in a commercial ball bearing steel deformed by rolling fatigue testing, and effects of retained austenite in the steel on the fatigue life were also investigated. Experimental results obtained were as follows:
(1) Metallographic changes were observed in the region up to the depth of 0.6∼0.8 mm under a running track of steel balls, and in this region, the so-called stress-affected zone, decomposition of the retained austenite and tempering of the martensite were observed.
(2) The parts 0.2∼0.3 mm deep from the surface were markedly hardened with the fatigue cycles and the increments of the hardness are larger as the initial amount of retained austenite increases.
(3) The fatigue life depends mainly on the character of the martensite, and the existence of the retained austenite improves the fatigue life.View full abstractDownload PDF (2718K) -
Hiroshi Saito, Mayumi Someno1972 Volume 36 Issue 7 Pages 720-721
Published: 1972
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSDownload PDF (361K) -
1972 Volume 36 Issue 7 Pages 721
Published: 1972
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSPlease see PDF Wrong:[Please see PDF] Right:[Please see PDF]View full abstractDownload PDF (27K)
- |<
- <
- 1
- >
- >|