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バーチャルイシュー
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バーチャルイシュー
86 巻, 3 号
選択された号の論文の10件中1～10を表示しています
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葛西 栄輝, 坂野 頼人, 中村 崇2000 年 86 巻 3 号 p. 139-145
発行日: 2000/03/01
公開日: 2009/06/19
ジャーナル オープンアクセスMelt formation and its flow are essential phenomena to proceed agglomeration in the sintering process of iron ores. A new experimental technique have been proposed which enables us to detect the macroscopic flow of melt initially formed by the reaction between iron ore and limestone. Using this technique, influence of iron ore property on the melt formation and assimilation process were examined in terms of meltdown temperature, chemical composition of dropped melt and shape change of a tablet sample. As a result, a difference was obtained in the melt-down behaviors between hematite and pisolitic ores. However, the hematite and pisolitic ores both having a similar gangue mineral composition show similar melt-down temperatures. A pisolitic ore having relatively high Al2O3content has little dependency of particle size and shows higher melt-down temperature. The effect of increase in Al2O3content is considerably large, and it leads to decrease in fluidity of formed melt and increase in melt-down temperature.抄録全体を表示PDF形式でダウンロード (9627K) -
千野 靖正, 岩井 一彦, 浅井 滋生2000 年 86 巻 3 号 p. 146-151
発行日: 2000/03/01
公開日: 2009/06/19
ジャーナル オープンアクセスIn a continuous casting of steel, the surface quality of a slab is strongly influenced by mold oscillation. Recently, a new idea in which the imposition of an intermittent alternating magnetic field was synchronized with the mold oscillation has been proposed for the improvement of surface quality under a concept of "soft contacting solidification". The concept is based on the information that the reduction of the contact pressure between a mold and a melt under the imposition of an alternating magnetic field results in good surface quality. However, the most suitable timing for the imposition of the magnetic field in a mold oscillation cycle still has not been determined. To clarify the behavior of the surface wave motion, which is closely related to the contact pressure between a mold and a melt, we have conducted a model experiment on the free surface motion of a molten gallium excited by the synchronous imposition of the intermittent alternating magnetic field and the simulated mold oscillation. The phase difference between the mold oscillation and the magnetic field has been studied from the viewpoint of the suppression of the surface motion. It has been found that the wave shape excited by the synchronous imposition agrees with the numerical superposition of the two wave shapes excited independently by the magnetic field and the mold oscillation, except for the case where a small surface excitation is observed.抄録全体を表示PDF形式でダウンロード (1249K) -
水上 英夫, 平城 正, 渡部 忠男2000 年 86 巻 3 号 p. 152-159
発行日: 2000/03/01
公開日: 2009/06/19
ジャーナル オープンアクセスThe behavior of argon gas bubbles at meniscus in the continuous casting mold was studied using a Wood's metal model. Argon gas was injected into Wood's metal flow through a porous plate or an orifice set in the immersion nozzle. Both the diameter and the number of argon gas bubbles generated at meniscus regions were measured with a color high-speed video camera. Generation rate of argon gas at each region of meniscus was measured with a mass flow meter. The distribution of argon gas bubbles at meniscus was dependent on the flow rate of argon gas injected into the immersion nozzle, but was independent on the flow velocity of Wood's metal in the nozzle. The number of argon gas bubbles at meniscus was dependent on the diameter of bubble. The ratio of the number of argon gas bubbles at meniscus in a unit time was estimated as the following function of bubble diameter.
n=Ωd-5.5
where n is the ratio of the number of argon gas bubbles at meniscus in a unit time, Ω is the constant and d is the diameter of argon gas bubble.
The flow velocity of Wood's metal at meniscus in mold was influenced by the injection rate of argon gas into the immersion nozzle.抄録全体を表示PDF形式でダウンロード (1637K) -
平本 一男, 田村 洋一2000 年 86 巻 3 号 p. 160-165
発行日: 2000/03/01
公開日: 2010/01/18
ジャーナル オープンアクセス表面粗さが方向性を持たず,最大でRaが1.44μm冷延鋼板表面における反射光強度の角度分布を詳細に測定し,法線から35度までの角度範囲の反射光を検出することで近似的に半球反射率の測定が可能になり,オンラインで正確な放射率が測定可能な方式を提案した。その方式をもとに放射率測定機能を持つ新しい放射温度計を試作した。実験室と生産ラインでの試験で測定精度を評価し,放射率は±13%,温度は±10℃の精度があることを確認した。
本温度計は放射率補正機能を持たない放射温度計と比較して,測定対象に接近させる必要があるとともに,測定用の開口部面積が広いため設置環境上の制約はあるが,冷延鋼板を測定対象にする場合には,放射率を高精度に測定する手段として有効であることが,連続焼鈍炉内での測定実験結果から確認された。
この方法を未知の測定対象物体へ適用するためには,事前に代表的な表面粗さの水準を選んで反射光強度の角度分布を測定する必要がある。その結果,反射光強度が照射角度から35度まで積分値で半球反射率の85%に達しないような散乱性の強い物体の場合には本測定方法の適用をそのままで適用することはできない。抄録全体を表示PDF形式でダウンロード (1116K) -
田中 龍彦, 合津 周治, 石山 高, 佐藤 真樹2000 年 86 巻 3 号 p. 166-170
発行日: 2000/03/01
公開日: 2009/06/19
ジャーナル オープンアクセスA sensitive and selective method is described for the determination of chromium at the low ppm level in iron and steel by differential pulse adsorptive cathodic stripping voltammetry with diphenylcarbazide as complexing agent. The complex of chromium(VI) with diphenylcarbazide, Cr(III)-diphenylcarbazone, was adsorbed on a graphite electrode for 5 min with open circuit in a nitric-sulfuric acids mixture solution containing phosphoric acid (pH=ca. 0.6), and subsequently was stripped in another solution (the acid mixture solution in the absence of iron(III) and phosphoric acid) in the potential range 0.3 to -0.1V vs. SCE at a scan rate of 50mV/s. Most of the foreign metals did not interfere by application of the non-electrolytic accumulation step. The calibration curve was linear over a concentration range 9.6×10-8to 1.3×10-6M of chromium (correlation coefficient>0.999) and passed through the origin. The detection limit (3σ) was 2.7×10-8M (1.43ngCr(VI)/ml) for an accumulation time of 5min. The determination of 8 to 500 massppm of chromium in iron and steel was achieved with good precision and accuracy within 1 h by the proposed method without any separation of the matrix. The simple method developed can be also applied to the determination of chromium in obsolete steel scrap.抄録全体を表示PDF形式でダウンロード (1058K) -
森田 俊一, 岩下 寛之, 田中 厚夫, 寺内 文子2000 年 86 巻 3 号 p. 171-175
発行日: 2000/03/01
公開日: 2009/06/19
ジャーナル オープンアクセスPolyester film laminated steel for can container will gradually replace lacquer coated steel sheet from environmental consideration and cost reduction. The process is characterized by partial melting of the film on the steel surface during lamination by pressing the supplied films between both sides of heated steel and a couple of cooled rubber rolls.
At present, most of polyester films used for the can containers are biaxially oriented films and various characteristics of film laminated steel for can use are strongly influenced by the degree of biaxial orientation of the laminated film.
Therefore, this report deals with the result of an experiment regarding variations of the degree of biaxial orientation with several polyester films, and thermal analysis of these polyester films by means of Differential Scanning Calorimeter (DSC).
Finally, from these experiments, we found that it is possible to estimate the variation of the degree of biaxial orientation during lamination by means of thermal analysis.抄録全体を表示PDF形式でダウンロード (3157K) -
矢野 正明, 福島 久哲, 中野 博昭, 秋山 徹也2000 年 86 巻 3 号 p. 176-180
発行日: 2000/03/01
公開日: 2009/06/19
ジャーナル オープンアクセス硫酸塩浴からのZn-Ni合金電析挙動に及ぼす浴中Pbの影響を,水酸化物抑制説に基づいて検討した。得られた結果は以下のとおりである。
(1) 正常型から変則型と共析挙動が変化する転移電流密度が,Pb添加により,高電流密度側へと若干移行した。この転移電流密度の増加は,Pb2+イオンの1金属Pbへの還元速度に対応する電流密度および電析物の荒れによる見掛けの電流密度の増加により説明できる。
(2) Pb含有浴においては,変則型共析が進行する領域IIにおいてNi含有率が増加した。この現象は,一部金属として析出したPbが,Zn水酸化物に封鎖されていないNi析出の活性点を連続的に供給するため,Zn析出に比べNi析出速度が増加したことによるものと思われる.抄録全体を表示PDF形式でダウンロード (3809K) -
杉浦 幸彦, 中村 康一, 浜井 升平2000 年 86 巻 3 号 p. 181-188
発行日: 2000/03/01
公開日: 2010/01/18
ジャーナル オープンアクセスGenerally Ti-10V-2Fe-3Al and Ti-6Al-4V alloys are solution heat treated below beta transus for use in order to avoid beta grain growth. But recently it was found that beta solution treated and over aged Ti-6Al-4V alloy has martensitic microstructures and good mechanical properties such as high fracture toughness and large crack propagation resistance. The effect of beta solution treatment on the mechanical properties of Ti-10V-2Fe-3Al have been hardly reported. In this study, the mechanical properties of beta solution treated and aged Ti-10V-2Fe-3Al was investigated and compared to conventional solution treatment. Then it is revealed that beta solution treatment gives better fracture toughness and crack propagation resistance comparing with alfa+beta solution treatment.抄録全体を表示PDF形式でダウンロード (8778K) -
角屋 好邦, 志水 悦郎2000 年 86 巻 3 号 p. 189-195
発行日: 2000/03/01
公開日: 2009/06/19
ジャーナル オープンアクセスThe creep behaviour of martensitic 9% chromium steels and the steels alloyed with Mo and W was investigated at temperature of 600 to 650°C under stress of 238 to 350 MPa. The results showed that the creep curves of these alloys were similar to those observed for martensitic 9-12% chromium steels. The minimum creep rate of εminfor model steels alloyed with Mo and W was one order of magnitude lower than εminin base steel. Also the changes of strengthening factor can be described by the effect of solid solution of Mo and W. The observed substructure revealed that sub-boundaries with well-knitted dislocations were always formed and the subgrain size in steady state was inversely proportional to the applied stress. The subgrain size and the dislocation density within subgrains during creep decreased unequivocally with increasing strain, while the misorientation of subgrains increased monotonically with increasing strain. The rate of coarsening for the subgrains of these alloys, however, was dependent on the solute Mo and W and its concentration. It is suggested that creep of these alloys is controlled by the mobility of dislocations in the subgrains and sub-boundaries under the present experimental condition.抄録全体を表示PDF形式でダウンロード (7434K) -
土田 紀之, 友田 陽, 長井 寿2000 年 86 巻 3 号 p. 196-202
発行日: 2000/03/01
公開日: 2009/06/19
ジャーナル オープンアクセスThe amounts of CO2 emission in the production of several commercial JIS standard steels have been estimated by the MLCA database prepared by Halada et al. Although low alloyed steels show smaller amounts of CO2 emission from their database, the database can not estimate the influence of thermo-mechanical process. Therefore, the change of CO2 emission during thermo-mechanical process has been estimated by the annual data concerning consumption of energies and materials publicized from Japanese steel makers. As a result, the change of CO2 emission related to thermo-mechanical process was estimated to share from 5.1% (minimum) to 7.7% (maximum) of the total amount for production. This change is not negligible but much smaller compared with the influence of increasing the content of alloying elements. By combining the prediction of tensile properties of multi-microstructure steels based on micromechanics and the MLCA database, the Mn-Si-C steels are recommended as a candidate of eco-steels from the viewpoints of excellent tensile properties and low CO2 emission for production.抄録全体を表示PDF形式でダウンロード (1511K)
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