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58 巻, 2 号
選択された号の論文の18件中1～18を表示しています
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盛利 貞1972 年 58 巻 2 号 p. 217-218
発行日: 1972/02/01
公開日: 2010/10/12
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徳田 昌則, 槌谷 暢男, 大谷 正康1972 年 58 巻 2 号 p. 219-230
発行日: 1972/02/01
公開日: 2010/10/12
ジャーナル フリーIn the case that FeO content in the blast furnace type slag controls the oxygen potential of the slag-metal system, Si content of iron in the hearth of blast furnace is higher than the equilibrium Si content calculated.
Furthermore, the rate of the reduction of Si02 from molten slag by iron saturated with carbon is very slow, that is rsi≠10-5mol/cm2·min. Consequently, it seems to be unable to explain that Si content in pig iron produced from the practical blast furnace can reach to 0.5-1.0% by only the slag-metal reaction.
It is proposed that the gas-molten metal reaction is predominant as the transfez of Si in the blast furnace.
From the thermodynamical calculations, it has been deduced that Psio has the order of 10-2-10-3 atm. in strongly reducing atmosphere of high temperature and low oxygen pressure such as the region adjacent to the tuyer zone in blast furnace and that SiO is sufficient source of Si.
It is considered that carbon content of iron plays an important role in themechanism of Si transfer.抄録全体を表示PDF形式でダウンロード (2504K) -
槌谷 暢男, 徳田 昌則, 大谷 正康1972 年 58 巻 2 号 p. 231-239
発行日: 1972/02/01
公開日: 2010/10/12
ジャーナル フリーAs one of a series of experimental studies designed to establish the mechanism of Si transfer in the blast furnace, carburization of iron and iron-sulfur melts by CO gas has been carried out in the temperature range from 1570 to 1720°C.
It was observed that the rate of carburization becomes larger as the temperature lower.
The mechanism of carbon transfer has been proposed and the adsorption phenomena, an apparent activation energy for the reaction 2CO (g)→C+CO2 (g), and the effect of mass transfer in gas-liquid boundary layer have been considered both experimentally and theoretically. From this study, it is concluded that the carbon transfer from gas phase to molten iron may have minor contribution to the carburization in the blast furnace.抄録全体を表示PDF形式でダウンロード (1735K) -
佐山 惣吾, 関口 逸馬, 植田 芳信1972 年 58 巻 2 号 p. 240-253
発行日: 1972/02/01
公開日: 2010/10/12
ジャーナル フリーAn investigation has been made on the abnormal swelling during prereduced pellet firing.Ten kinds of iron ore and 3 kinds of solid reductant were tested.When pellet contained a reactive reductant, abnormal swelling occurred in some kinds of ore.This was found to be due to the growth of metallic filament in a pellet, which grew abruptly in the reduction at about 1000°C.
The swelling was related to the unstable phase during reduction, or this may be attributed to (1) laminated structure, (2) strain within crystals, (3) weathering of ore, (4) incomplete recrystallization and so forth.
From the experiment in which 2% of pyrite or 1% of sulphonic acid (S15.9%) was mixed with ores, it was found that sulphur addition was effective to prevent from swelling.However, sulphur addition was disadvantage with respect to pellet quality, because sulphur remained in pellet after reduction.抄録全体を表示PDF形式でダウンロード (9965K) -
佐野 正道, 森 一美, 松島 美継, 鈴木 鼎1972 年 58 巻 2 号 p. 254-266
発行日: 1972/02/01
公開日: 2010/10/12
ジャーナル フリーThe rates of reaction of oxygen with liquid silver have been studied by blowing Ar-O2 mixtures onto the metal electrically heated both by resistance and by high frequency induction at 1000°C.
Oxygen absorption into liquid silver is a first-order reaction, which is similar to nitrogen absorption into liquid iron, while oxygen desorption into the atmosphere of pure argon is virtually a second-order reaction, which is similar to nitrogen desorption into the same atmosphere.
On the other hand, the rates of absorption and desorption near equilibrium oxygen concentrations are found to be equal. But the apparent first-and second-order reaction rate constants are both dependent on the oxygen partial pressure in the gas phase.
These phenomena are explained by mixed-control model of first-and second-order reactions. The firstand second-order reaction rate constants are 0.022 cm/sec and 0.055 cm/%.sec. It is presumed that the former corresponds to mass transfer in the metal and the latter to surface reaction.
The mixed-control model is applied to the reaction of nitrogen desorption from liquid iron.It is shown that with decrease of the nitrogen partial pressure and nitrogen concentration in the metal the kinetics changes gradually from a first-order to second-order reaction.抄録全体を表示PDF形式でダウンロード (2654K) -
永山 宏1972 年 58 巻 2 号 p. 267-284
発行日: 1972/02/01
公開日: 2010/10/12
ジャーナル フリーIn order to reduce the oxide inclusions originated from casting-pit refractories, the properties giving the influence on the wear by molten steel and slag were studied for commercial grade casting-pit refractories by laboratory test. The form and the quantity of these bricks entrapped into molten iron were also investigated.
The results were summarized as follows.
(1) It was recognized that semi-zircon brick (Zro2 40%) had excellent resistance to chemical attack by molten iron and slag, and high alumina brick and high silica brick (Sio2 81.5%) having a stable texture with moderate grain size distribution had good resistance to mechanical wear.
(2) Discussion was made on the slagging mechanism of the bricks by the observation of change in quality of the bricks after slagging test.
(3) The mineral composition of oxide inclusions entrapped into molten iron in the crucibles made of each tested brick were as follows.-wustite-fayalite (FeO-2FeO·SiO2) for Zro2-containing brick, silicate glass for high alumina brick, corundum crystallizing silicate glass for pyrophyllite and high silica brick, FeO-containing silicate glass for SiC-added pyrophyllite brick. The fine grains of each brick were also detected in molten iron.
(4) Taking the experimental results on some properties of the bricks after slagging test into account, the tendency of entrapping bricks was considered.
(5) It was considered that conventional pyrophyllite and high silica brick, having good texture with moderate grain size distribution, exhibited a relatively small tendency of entrapping, however these slagging products suspended in molten steel were possible to be a source of aluminate inclusions.抄録全体を表示PDF形式でダウンロード (5630K) -
木村 康夫, 山根 孟洋, 豊田 収1972 年 58 巻 2 号 p. 285-292
発行日: 1972/02/01
公開日: 2010/10/12
ジャーナル フリーIn a cold-rolled and aged 17-7 PH spring steel, the relations between the anisotropies of mechanical and magnetic properties and textures have been investigated.
The rolling textures of martensite in 17-7 PH steel consist chiefly of two principal components, {211}‹011› and {100}‹011›, which are similar to those in mild steel. After aging the cold-rolled 17-7 PH steel, new component is not found in martensite, but a new component near {113}‹211› appears in austenite transformed reversely from martensite.
After aging the cold-rolled 17-7 PH steel at around 500°C, the highest values of tensile strength and Young's modulus are obtained in the transverse direction to the rolling direction of sheet, and the highest residual induction is observed in the rolling direction.
The magnetic torque curves of cold-rolled 17-7 PH sheet show the cubic anisotropy. However, uniaxial anisotropy increases rapidly by subsequent aging at around 650°C and the easy direction of magnetization is parallel to rolling direction.
It may be concluded that the good spring material with ferromagnetism is obtained, when the iron-base alloys having semi-hard magnetic property and high Young's modulus are cold-rolled, cut parallel to the rolling direction and aged in the temperature range when the residual induction is increased and at the same time the coercive force is decreased.抄録全体を表示PDF形式でダウンロード (1437K) -
寺崎 富久長, 大谷 泰夫1972 年 58 巻 2 号 p. 293-305
発行日: 1972/02/01
公開日: 2010/10/12
ジャーナル フリーThe brittle fracture surfaces of the ferrite-pearlite and the martensite structure in low carbon steels were investigated with a scanning electron microscope. The direct correspondence between the fracture surface and the microstructure was made, and the dependence of the fracture mode on grain size was studied from the view point of the crystallographic orientation relationship.
The fracture surface prepared by the Charpy impact test revealed the discontinous fracture process; it consisted of the repetition of nucleation and propagation of the microcrack, and the cleavage plane was determined as {100} by the orientation measurements of the facet pit and the fracture surface. These microcrack propagation units could be considered as the fracture facets and those in ferrite-pearlite structure were composed of some adjacent grains in which the crystallographic orientation differences about fracture surface {100} were very small. The fracture facet was generally larger than the ferrite grain size, but it did not correspond to the austenite grain directly.
The martensite structure, both as quenched and tempered, had the domains in which the crystallographic orientation of laths was uniform and the crack also nucleated and propagated in {100}.抄録全体を表示PDF形式でダウンロード (15137K) -
大野 恭秀, 土生 隆一, 関野 昌蔵1972 年 58 巻 2 号 p. 306-316
発行日: 1972/02/01
公開日: 2010/10/12
ジャーナル フリーThis paper presents the results of the investigation made into some factors govering the toughness of heat affected zone (HAZ) in welded steel plates.
To examine the toughness of HAZ, a thermal cycle of welding from low heat input to high heat input was applied to 12 kinds of commercial steels comprising high strength steels and steels for low temperature service. The following results were obtained.
When heat input is low the HAZ becomes lower bainitic structure or martensitic structure whose toughness is high. But with the increase of heat input, the structure changes to upper bainitic structure, while the toughness becomes lower.
It is suggested from the above phenomena that the toughness of HAZ can be improved by adding some elements which serve to increase hardnability.
Ni lowers vTrs of HAZ and a decrease in carbon content improves the toughness of upper bainite.抄録全体を表示PDF形式でダウンロード (7165K) -
室井 新一郎, 染野 檀1972 年 58 巻 2 号 p. 317-324
発行日: 1972/02/01
公開日: 2010/10/12
ジャーナル フリーThe corrosion behavior of iron, cobalt, titanium, zirconium, nickel and chromium in molten V205 was investigated. The main results obtained are as follows:
1) At the initial stage, the oxidation of iron and cobalt obeys the linear rate law. In the next stage, the oxidation is accelerated and then retarded at the final stage.
2) The linear relationship at the initial stage implies that the oxidation reaction is diffusion controlled process.
3) It is considered that the oxidation rate should be affected by composition of the melt which changes with progress of the oxidation.
The oxidation rates of metals M in V2O5-MO melts were examined, and it was concluded that a) the oxidation rates of iron and cobalt are maximum at the eutectic composition, b) the oxidation rate of zirconium is less affected by the addition of ZrO2 in V2O5 melt, and c) as for nickel, the rate is retarded by adding NiO in V2O5 melt.
4) The causes of the accelerated oxidation can be suggested to be 1) the increase of the oxidation rate and the enhancement of convection in the melt due to the increased temperature by exothermic oxidation reaction of the metal, 2) the increase of concentration of oxidizing agent in V205-M0 melt caused by the dissolved metal oxide, MO.抄録全体を表示PDF形式でダウンロード (1597K) -
大久保 安威, 石光 章利1972 年 58 巻 2 号 p. 325-342
発行日: 1972/02/01
公開日: 2010/10/12
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古林 英一1972 年 58 巻 2 号 p. 343-359
発行日: 1972/02/01
公開日: 2010/10/12
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1972 年 58 巻 2 号 p. 360-368
発行日: 1972/02/01
公開日: 2010/12/22
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槌谷 暢男, 徳田 昌則, 大谷 正康1972 年 58 巻 2 号 p. A1-A8
発行日: 1972/02/01
公開日: 2010/10/12
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小野 良吉1972 年 58 巻 2 号 p. A9-A22
発行日: 1972/02/01
公開日: 2010/10/12
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藤田 英一1972 年 58 巻 2 号 p. A23-A38
発行日: 1972/02/01
公開日: 2010/10/12
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竹内 伸1972 年 58 巻 2 号 p. A39-A48
発行日: 1972/02/01
公開日: 2010/10/12
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福原 章男, 藤井 國一1972 年 58 巻 2 号 p. A49-A62
発行日: 1972/02/01
公開日: 2010/10/12
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