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Volume 29, Issue 6
Displaying 1-24 of 24 articles from this issue
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Yûnoshin Imai, Kazuyoshi Nishino, Yûsaku Nakagawa1965 Volume 29 Issue 6 Pages 561-566
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe mode of deformation and etching figure of Fe-Cr alloys after aging at 475°C were studied. (1) The recrystallization texture after cold rolling is mainly the (111) type in the alloys containing above about 20% chromium. (2) In the embrittled state, etching figures characteristic to crystal planes are detected after etching by aqua regia in glycerol. The crystal plane readily etched is the (100) plane. (3) The relation between the ductile-brittle transition phenomena and the mode of deformation or fracture is similar to that of body centered cubic metals. Finally the nature of 475°C embrittlement was discussed.View full abstractDownload PDF (1452K) -
Sadatoshi Inada, Koichi Uesaki, Shinji Kasei, Takeshi Nakashima1965 Volume 29 Issue 6 Pages 567-572
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSA specimen of 3×3×5 mm was prepared from the commercially pure copper, which was then compressed longitudinally in vacuum at about 800°∼850°C. One side of the specimen was observed microscopically. The following conclusions were reached:
(1) In the central part of the specimen, grain boundaries, situated transversely to the compressive direction, migrated well. In the neighberhood of the compressed end surface of the specimen, grain boundaries, situated parallel to the compressive direction, migrated well. In the middle part between the central part and the compressed end surface of the specimen, both grain boundaries, transverse and parallel to the compressive direction, migrated well.
(2) In the central part of the specimen, wedge-shaped cracks at triple-grain boundaries were often observed along the grain boundaries parallel to the compressive direction. In the neighborhood of the compressed end surface of the specimen, wide and diffused boundaries with the secondary cracks formed together transversely to a primary grain boundary, were observed. In the middle part of the specimen, cracks with transitional types between wedge-shaped cracks and wide and diffused boundaries were observed.
(3) When cracks along twin boundaries were observed, the amounts of strain were larger than those at the time when cracks were observed everywhere along grain boundaries. It is considered that the amounts of strain, when cracks were formed along twin boundaries, are larger than those in the case of grain boundaries.
(4) The central part is compressed strongly, and grain boundaries in this part can easily migrate. The neighberhood of the compressed end surface is strongly affected by a frictional force, and grain boundaries in this part can hardly migrate.View full abstractDownload PDF (1004K) -
Tadayuki Nakayama, Masaru Satoyoshi1965 Volume 29 Issue 6 Pages 573-577
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSOxidation behaviours and oxide scales of Fe-B system alloys (0.04∼4.20 wt%B) in air at high temperatures (800° and 1000°C) were studied by using the thermobalance, X-ray diffraction and optical microscopic methods.
The weight gain of Fe oxidized at 800°C for 3 hr fell to ca. 1/4 by addition of 0.04 wt%B, and no definite differences of weight gain from this alloy could be observed in the alloys containing more B above 0.04 wt%. The X-ray diffraction patterns obtained from oxide scales (800°C, 6 hr) of the alloys containing less than 0.13 wt%B showed the existence of iron oxides as α-Fe2O3, Fe3O4 and FeO. In high B content alloys (B>0.32 wt%), X-ray diffraction lines similar to the Fe-B double oxide (probably Fe(BO2)2) were detected from the inner oxide scale formed under the same conditions, though the FeO crystal layer was not observed in the scales. Therefore, it was deduced that the reason why the Fe-B system alloys showed the good oxidation-resisting nature is probably due to the protective effect of the Fe-B double oxide layer.
The weight gain of Fe-B system alloys by oxidation at 1000°C for 3 hr decreased with increasing B contents in the alloys and showed a minimum at 0.81 wt%B alloy, but a catastrophic oxidation phenomenon was observed in the alloys containing 2.45, 2.54 and 4.20 wt%B under the same oxidation conditions. It was also suggested experimentally that the oxidation-resisting nature of low B content alloys at 1000°C was perhaps due to the protective effect of the Fe-B double oxide layer consisting of Fe(BO2)2 or Fe2··Fe…BO5, and moreover, that the catastrophic oxidation of high B content alloys was mainly associated with the formation of a low melting eutectic phase composed of FeO and Fe-B double oxides.View full abstractDownload PDF (964K) -
Noboru Makino, Yasuo Kimura, Isamu Yamaki1965 Volume 29 Issue 6 Pages 577-581
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSEffects of sulphur addition on the structure and magnetic properties of Alnico type alloys containing titanium were studied. Alnico type alloys containing 1 to 5% titanium could be converted into a columnar crystal structure by the addition of sulphur. Consequently, the residual induction amounts to 10100 G, the coercive force 1350 Oe, and the maximum energy product 7.2 M.G.Oe in Alnico 8 magnet alloy.
The columnar crystals of Alnico type alloys containing titanium are smaller in diameter than those of Alnico 5. For example, the columnar structure of Alnico 6 (1.2%Ti) contains 150 to 400 crystals per 1 cm2 of the cross section, while in Alnico 5, merely some tens of crystals.
The residual induction, 11000 G in the columnar Alnico 7 and 10000 G to 10500 G in the columnar Alnico 8, is not affected by sulphur addition. The coercive forces of columnar Alnico 7 and Alnico 8 containing about 0.2% sulphur are 1100 Oe and 1350 Oe respectively, but they fall down with the increasing sulphur content.
The amount of sulphur remaining in the solidified alloys is smaller than that initially added, and the loss of added sulphur through casting and freezing becomes greater as the amount of sulphur addition becomes large.
Microstructures of sulphur added Alnicos show needle or rod-shaped precipitations, which increase in amount with the increasing sulphur content and are considered to be some sulphides of metals.View full abstractDownload PDF (662K) -
Tamotsu Fukatsu, Kazuhiko Yuhara1965 Volume 29 Issue 6 Pages 582-588
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn steel-cutting by a cemented carbide tool, it has been pointed out that the crater is due to the welding of chips on the top face of the tool and the subsequent diffusion. In the present experiment this welding-phenomenon was examined by an analogue test, in which two grades of cemented carbides, WC-Co and WC-TiC-Co, and two kinds of steels, S10C (0.10%C) and S55C (0.55%C), were welded respectively under a pressure at 1200°C for 2 hr in a vacuum furnace.
It was found by microscopic observation that the distinct three layers, two layers (A and A′) in the carbide side and one layer (B) in the steel side, were formed by mutual-diffusion in the vicinity of the interface welded, and those were distinguished clearly from the matrixes by double etching by H2O2 and picral. In the grade of WC-Co, A and A′ appeared in every case for S10C and S55C, which were considered to be some carbon deficient phase of W-Co(Fe)-C. On the other hand, in the grade of WC·TiC-Co, A and A′ apeared for S10C only and did not for S55C, moreover grains of the WC·TiC double carbide remained in spots in the diffusion-layer. These phenomena indicate the difference of stability of the cemented carbide for the steel welded. In fact, this was confirmed by X-ray microanalysis. Diffusion of Co was most predominant in all components and concentrated on the diffusion-layer, B, in the steel. Fe was concerned with the formation of the diffusion-layers A and A′ in the cemented carbide. Diffusion of W into the steel was remarkable for the grade of WC-Co than that of WC-TiC-Co. Carbon resulting from the resolution of WC was permeated in the matrix of the steel, passing through the diffusion-layers. Diffusion of Ti into the steel was hardly observed. From the above it may be concluded that since the WC·TiC double carbide is higher in resistance against the steel than WC at a high temperature, the system of WC-TiC-Co is superior to that of WC-Co in regard to the crater.View full abstractDownload PDF (1047K) -
Shigeo Horiuchi, Tadatsune Okubo, Isao Gokyu1965 Volume 29 Issue 6 Pages 589-596
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSAs a result of analyses of experimental data by many workers, it is shown that there are clear correspondences of three types between rolling and recrystallization textures of face-centred cubic metals and alloys. They are as follows: for copper
(This article is not displayable. Please see full text pdf.)
The formation of the rolling texture, which is the base in these correspondences, can be explained fairly well by developing the theory proposed by Dillamore et al. It is also shown that crystal areas with {112}⟨111⟩ and its twin orientation, which seem to have a bearing on the formation of the recrystallization cube texture, are rformed adjoining each other.View full abstractDownload PDF (1524K) -
Shigeo Horiuchi, Tadatsune Okubo, Isao Gokyu1965 Volume 29 Issue 6 Pages 596-598
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSOrientation changes due to the slip rotation during cross rolling are considered. As a result, the formation of the {110}⟨7,7,10⟩ component, which is almost consistent with the {110}⟨223⟩ component reported previously, in single crystals with orientations but (100)[001] and polycrystals of face-centred cubic metals and alloys heavily cross-rolled, can be explained. Since after recrystallization , the {519}⟨4 11,1⟩ texture having has a relationship of the rotation of 30° about the common ⟨111⟩ pole with the rolling texture is obtained, the cross-rolling and recrystallization textures belong to the B type proposed in the preceding paper.View full abstractDownload PDF (285K) -
Kunio Suzuki1965 Volume 29 Issue 6 Pages 598-604
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSAge-hardening and related calorimetric behaviours have been investigated of variously heat-treated samples of Cu-7%Al-1.5%Co alloy. The main results are as follows:
(1) Regardless of the foregoing heat-treatments, cold-worked samples show a strain-hardening below 350°C. This hardening is accompanied by a heat evolution, the amount being proportional to the degree of cold-working.
(2) Since cold-working produces defects such as stacking faults and deranges the short-range order, the above hardening is ascribed to the concentration of solute atoms to the defects, whereas the heat evolution to recovery of short-range order.
(3) Cold-working enhances the precipitation hardening, which takes place at higher temperatures. In cold-worked samples the attracted solute atoms at the defects are so rich that some of them are supposed to survive at lower temperatures heat-treatments, serving as nuclei for precipitation of Guinier-Preston zones and the β′-phase.
(4) An anneal-softening, which occurs below 200°C before the above types of hardenings, seems to be the same in nature as that observed in other metals and alloys. This may be due to the release of internal stress.View full abstractDownload PDF (1451K) -
1965 Volume 29 Issue 6 Pages 604
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSPlease see pdf. Wrong:4∼10 hr, 100 hr, [in Japanese], 280°C, 280°C, 280°C, 280°C Right:0∼10 hr, 10 hr, [Please see pdf], 250°C, 250°C, 250°C, 250°CView full abstractDownload PDF (20K) -
Imao Tamura, Masao Ibaraki, Haruo Nozaki1965 Volume 29 Issue 6 Pages 605-610
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe effect of ausforming on the strength, toughness and hardness of several tool steels containing high carbon and high alloying elements (SKH 2, SKH 4A, SKH 9, SKD 1 and SKD 11 type steels in JIS) were examined by static-bending and hardness tests.
The results obtained were as follows:
(1) In tool steels containing high carbon and high alloying elements, there was a tendency that the increase in toughness by ausforming was more remarkable than that in strength, and the effect of ausforming varied with the carbon content and alloying elements in the steels.
(2) The effect of ausforming was hardly observed in the SKD 1 specimen, but in SKH 9, remarkably observed in both strength and toughness.
The 50%-ausformed SKH 9 specimen had the maximum bending stress of 400 kg/mm2, the yield stress of 300 kg/mm2 and the absorbed energy of 750 kg-mm which was about 7 times as large as that of the unausformed specimen.
(3) In the ausformed SKH 9 and SKD 11 specimens, their hardness tempered at 300°∼400°C temperatures increased with the increasing reduction of rolling, and by a 50% reduction the secondary hardening became indistinct in the hardness-tempering temperature curve.
(4) Optical micrographs showed that there was no remarkable difference between the ausformed and unausformed specimens, except for cracking of carbides which had already existed at the austenitizing temperature.View full abstractDownload PDF (1816K) -
Toshiaki Shimohiro, Keizo Sugimoto, Kiyoshi Nishimoto1965 Volume 29 Issue 6 Pages 611-614
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn order to establish a sampling method best suited for gas analysis by the pouring method, the factors influencing the oxygen and hydrogen contents in cast iron were investigated, with the following results: (1) A white iron sample taken from the bottom poured metal mould showed a very limited segregation of oxygen and hydrogen. (2) Both the preheating temperature of the metal mould and the holding time of molten metal in the spoon had no influence on oxygen and hydrogen contents. (3) When a white iron sample was held in air after sampling, the oxygen content showed no change, while hydrogen was found to diffuse and decrease gradually. (4) In the transition part from the mottle to the grey structure, a sharp increase in the oxygen content was observed. In other words, slowly cooled samples showed a higher oxygen content. The difference of the cooling rate that solidified white or grey produced no variation in the oxygen content. However, further investigation is necessary to determine which structure sample (white or grey) shows a value closer to the true oxygen content in the melt. (5) It was made clear that there was a correlation in the oxygen content between slowly and rapidly cooled samples.View full abstractDownload PDF (984K) -
Yutaka Shiraishi, Tunezô Saitô1965 Volume 29 Issue 6 Pages 614-622
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe viscosities of molten CaO-SiO2-CaF2, -MgF2, -BaF2 systems have been measured at 1450°∼1600°C by viscosimeter “Rotovisko”, following therotating cylinder method. From the results it has been shown that these melts behave as Newtonian fluids, and that the relation between viscosity coefficient and temperature is expressed by an Arrhenius type equation.
The viscosities of the melts are independent of the kind of fluoride in case of the equimolar composition.
The addition of fluoride causes the lowering of the viscosity coefficient, and this effect is significant in acid melts, but not remarkable in basic melts.
In the acid melts, this phenomenon is discussed in terms of the reduction of the flow unit. Then, the possible reaction between silicate anions and fluorine ions is suggested as follows:
(This article is not displayable. Please see full text pdf.)View full abstractDownload PDF (1329K) -
Yutaka Shiraishi, Tunezo Saitô1965 Volume 29 Issue 6 Pages 622-625
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn a previous paper it was shown that the viscosity coefficient of a basic slag was not affected significantly by the addition of fluoride. To elucidate the effect of fluospar on the improvement of the fluidity for the basic slag, the following measurements have been carried out: (i) Thermal analysis of the CaO-SiO2-CaF2 system; (ii) Construction of phase diagrams of pseudo-binary systems for CaO·SiO2-CaF2, -MgF2, -BaF2; (iii) Density of a CaO-SiO2-CaF2 melt.
The results are as follows:
(1) Liquidus curve of the CaO-SiO2 system is lowered by the addition of CaF2.
(2) Phase diagrams of pseudo-binary CaO·SiO2-Fluoride systems show a simple eutectic, and the eutectic points are found at 1175°C for 36 wt%CaF2, at 1100°C for 39 wt%MgF2, and at 955°C for 60 wt%BaF2.
(3) The addition of CaF2 to the CaO-SiO2 melt causes an increase in density, resulting in a considerable decrease in kinematic viscosity.
From these results it is deduced that the effect of fluospar on the fluidity of basic slag is mainly due to the descending of the liquidus curve and the increase in the density of melts.View full abstractDownload PDF (836K) -
Koin Ito, Kokichi Sano1965 Volume 29 Issue 6 Pages 626-630
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSDeoxidation of molten iron by hydrogen is used frequently as a deoxidation method of iron and steels in melting of laboratory scale. Here, as an example of gas-molten iron reactions, the authors studied on the mechanism and velocity of the deoxidation of molten iron at 1550°∼1745°C by hydrogen diluted with argon. Each of the deoxidation curves was expressed as the first order reaction with respect to the oxygen content in molten iron. However, the specific rate constants obtained were proportional to partial pressure of hydrogen, and gave a negative activation energy to the deoxidation reaction. Therefore, the two-film theory which was introduced previously to analyse the dissolution velocity of oxygen from H2-H2O gas was applied to the molten iron. It was considered that the deoxidation was divided in to three steps: (1) transport of the dissolved oxygen from the iron bulk to the reaction interface or rather to the gas-metal boundary, (2) at the interface, the chemical reaction, 2H+O=H2O, or H2+O=H2O, is always at equilibrium, and (3) H2O removes from the gas-metal boundary to the gas bulk. From the above consideration it was concluded that the rate equation could be expressed by the first order of the oxygen content in iron and the partial pressure of hydrogen. The results obtained were as follows:
(1) The activation energy of this reaction was thought to be 3.8±1.3 kcal/mole.
(2) The principal rate determining step was considered to be the removal of H2O through the gas-side diffusion layer from the gas-metal boundary to the gas bulk.
(3) The rate of deoxidation increases with increase of the partial pressure of hydrogen and with decrease of the temperature of molten iron. Therefore, it was expected that by the use of higher pressure hydrogen at a lower temperature the oxygen content of molten iron reached a smaller value more rapidly.View full abstractDownload PDF (681K) -
Tadayoshi Takahashi, Iwao Hagiwara1965 Volume 29 Issue 6 Pages 631-637
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn order to make clear the gravitational behaviour of solute element enriching in the dendrite arm space of the partial solidification zone between the liquid region and the solid region of the ingot, the present study was carried out using Al-Cu (4%) alloy. The results obtained were as follows: (1) Segregation of the solute element was not observed in the molten state. (2) The gravity segregation of the solute element was observed in the partial solidification zone with fully developed dendrite arms. (3) The gravity segregation of the solute element increased when the freezing rate of the alloy in the freezing range was slow, and the amount of the solid phase became nearly equal to that of the liquid phase as a result of the crystal growth. (4) In case of the gravity segregation, the flow direction of the solute element through the dendrite space was downward and inclined toward the center of the ingot. (5) The behaviour of the solute element in the partial solidification zone was influenced by the temperature gradient of the ingot, when the partial solidification zone was coexistent with that of the complete liquid. When the temperature gradient of casting was from outside to inside or from upward to downward, in addition to the gravity segregation of the solute element in the partial solidification zone, the diffusion of the solute element from the partial solidification zone to the liquid region was observed. Whereas, in case of the temperature gradient from downward to upward, only the diffusion of the solute element from the partial solidification zone to the liquid region was obseved. (6) In the partial solidification zone of the preceding paragraph, the solute element enriched due to the gravity segregation produced a new equilibrium relation with the surrounding solid phase, and consequently the pre-existent dendrite arms in the partial solidification zone were remolten away.View full abstractDownload PDF (1008K) -
Iwao Hagiwara, Tadayoshi Takahashi1965 Volume 29 Issue 6 Pages 637-642
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSIn this study the authors attemped to destroy a part of the partial solidification zone at the progressive interface of solidification in a small Al-Cu alloy ingot. The surface of the partial solidification zone was scraped with a steel or graphite rod for the purpose of destroying the partial solidification zone. Hence, the successive progress of the partial solidification zone from the scraped region was impeded and the whole bulk liquid was induced to a creamy state. The ingot thus obtained was segregationless and remarkably fine grained. The causes of these phenomena were considered to be due to the self-nucleation of crystals and the effect of turbulent flow by scraping. This consideration was ascertained by means of a thermal analysis and an observation of the process of solidification. Furthermore, the practical application of this work was investigated from the preceding point of view, and this solididification method seemed to be effective for practical ingot solidification.View full abstractDownload PDF (804K) -
Yûnoshin Imai, Tôru Miyazaki1965 Volume 29 Issue 6 Pages 642-647
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSHot extruded dispersion strengthened irons containing Al2O3, MgO and SiO2 were prepared, and the yield stress, tensile strength, elongation, reduction of area, hardness, creep time to 2% strain, schock value and fatigue property were investigated. The results obtained were as follows: The temperature dependence of mechanical properties of Fe-SiO2 alloy was larger than Fe-MgO and Fe-Al2O3 alloys and the latter alloys showed almost the same behaviors. The yield stress, tensile strength and hardness were superior at each temperature; especially the tensile strength of Fe-SiO2 alloy at room temperature was over 100 kg/mm2. The ductile properties, elongation, reduction of area and schock value were inferior to those of pure iron. The fatigue limit appeared over 107 cycles and the stress was 32∼36 kg/mm2, comparable to the commercial spring steel. Fracture was observed at the interface between oxide particle and iron matrix.View full abstractDownload PDF (1232K) -
Yûnoshin Imai, Tôru Miyazaki1965 Volume 29 Issue 6 Pages 648-653
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSRelations of the particle mean free path with the yield stress (0.1% strain proof stress), hardness and schock value at room temperature for the dispersion strengthened irons containing alumina, silica and magnesia were investigated. The experimental results were as follows: (1) A linear relationship between the yield stress and the reciprocal mean free path was found in agreement with Orowan’s relation, but the slope of the experimental straight line was steeper than Orowan’s theoretical slope. (2) The room temperature hardness (V.H.N.) was linearly proportional to the log of the mean free path. (3) Schock value-mean free path curves showed a maximum schock value at 2∼3 microns of the mean free path. (4) The mechanical properties of Fe-MgO and Fe-Al2O3 alloys showed almost the same behaviors, but Fe-SiO2 alloy differed from the former alloys.View full abstractDownload PDF (911K) -
Tatsuro Kunitake1965 Volume 29 Issue 6 Pages 653-657
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe temperature dependence of equilibrium partition of alloying elements between ferrite and cementite was determined for several steels. The electrolytic isolation of carbides was conducted after the tempering of quenched microstructures for varying periods of time and the alloy content in carbides was determined. The equilibrium Mn, Cr and Mo concentration in cementite, Ce, decreased with temperature and its temperature dependence was expressed by the following equation:
(This article is not displayable. Please see full text pdf.)
\ oindentThe distribution coefficient, Ce⁄C0 (C0: the equilibrium alloy concentration in ferrite), at a fixed temperature was relatively insensitive to the co-existence of other alloying elements and to the carbon content in steel. The time to reach the equilibrium and its dependence on the carbon content of steel, and the initial structures before tempering were also investigated.View full abstractDownload PDF (1059K) -
Noboru Makino, Yasuo Kimura, Masaki Suzuki1965 Volume 29 Issue 6 Pages 658-661
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe particles examined were those crushed 2, 50 and 150 times in a hammer mill. Coercive force IHC, saturation magnetization Is and magnetic anisotropy constant K decrease with increasing temperature. Decrease in IHC is more steep than that in anisotropy field Ha calculated from observed Is and K using the relation Ha=2K⁄Is, and it is suggested that in explaining temperature variation of IHC on the basis of the single domain theory, the effecct of change in critical size must be taken in account. The change in IHC produced by cold working is supposed to be attributable to the change in magnetic anisotropy and saturation magnetization of the material composing single domain, which are able to take place as a result of directional precipitation of the non-magnetic disordered phase proposed by Koch and Campbell.
The temperature variation of remanence of MnAl magnets was also measured. The reversible demagnetization between 20° and 100° is 0.06∼0.09%/°C, while irreversible demagnetization is 2∼5% (20°∼100°) or 3∼7% (20°∼150°). No remarkable difference was observed between thermal demagnetizations of magnets prepared by crushing and compacting and by swaging.View full abstractDownload PDF (666K) -
Chiyokichi Kodo, Kagenori Ichikawa1965 Volume 29 Issue 6 Pages 661-664
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSThe method for the A.C. polarographic determination of trace titanium in steels was studied.
An A.C. polarographic wave of titanium in a supporting electrolyte containing oxalic and sulfuric acids was highly sensitive and suitable for determining titanium. A trace amount of titanium in steel was determined with the use of a supporting electrolyte composed of 4% oxalic acid and 0.72 M sulfuric acid by A.C. polarography. The sample was decomposed with hydrochloric, nitric and hydrofluoric acids. After the white fuming treatment with perchloric acid, the solution was diluted with water, and made alkaline with ammonia water to precipitate titanium after an addition of EDTA for masking the precipitation of hydroxide of ferric ion, etc.
The precipitate on the filter paper was dissolved with 50 mL of the mixture of 4% oxalic and 0.72 M sulfuric acid. The A.C. polarogram of the solution was taken in the range −0.2∼−0.7 V and titanium was determined. In case of the sample containing vanadium, the solution was diluted with water after the white fuming treatment with perchloric acid and made alkaline with sodium hydroxide for removing vinadium. The precipitates of titanium and iron hydroxides were dissolved with perchloric acid and treated with EDTA and ammonia water.
The proposed method is suitable for 0.001∼0.1% titanium in steel.View full abstractDownload PDF (464K) -
Seita Sakui, Tsutomu Kakuma, Tsutomu Mori1965 Volume 29 Issue 6 Pages 665-666
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSDownload PDF (209K) -
1965 Volume 29 Issue 6 Pages 666a
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSPlease see pdf. Wrong:80% CH3COOH+2% HCOOH Right:80% CH3COOH+2% HCOOH BoilView full abstractDownload PDF (18K) -
1965 Volume 29 Issue 6 Pages 666b
Published: 1965
Released on J-STAGE: April 04, 2008
JOURNAL FREE ACCESSPlease see pdf. Wrong:High Curves of Cr-Ni-Mo Steels Right:Curves of High Cr-Ni-Mo SteelsView full abstractDownload PDF (18K)
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