巻号一覧
前身誌
78 巻, 11 号
選択された号の論文の16件中1～16を表示しています
- |<
- <
- 1
- >
- >|
-
王寺 睦満1992 年 78 巻 11 号 p. 1625-1634
発行日: 1992/11/01
公開日: 2009/05/29
ジャーナル フリー製鋼技術者にとって耐火物の世界は,欠くことの出来ない技術分野であることは論を待たない.したがって,製鋼技術者は今後とも,いろいろな形で耐火物技術者との密接な交流を通じて地道に努力を積み重ねながら,あらゆる課題に対して適切な解を見出していくことが必要である.とくに,耐火物損耗機構や耐火物~溶鋼反応など基礎的な原理,原則の研究に基づいた技術の開発が最重要課題であると言えよう.抄録全体を表示PDF形式でダウンロード (3842K) -
稲垣 裕輔1992 年 78 巻 11 号 p. 1635-1643
発行日: 1992/11/01
公開日: 2009/05/29
ジャーナル フリーPDF形式でダウンロード (13909K) -
青木 孝夫, 岩舘 忠雄, 江原 隆一郎, 梅山 嘉夫, 横堀 武夫1992 年 78 巻 11 号 p. 1644-1649
発行日: 1992/11/01
公開日: 2009/05/29
ジャーナル フリー応力腐食環境下での寿命評価技術に関する情報収集を目的として,原子力発電用大形低圧タービンロータ材を用いた38%NaOH+0.01%CuO水溶液環境下での,き裂発生試験およびき裂進展試験が実施された.その結果,寿命評価にあたっての評価試験方法として,下記の点が指摘された.
(1)4点曲げ試験によるき裂発生寿命試験では,一部の試験片においてき裂発生寿命が短い場合が観察されたが,1000時間の寿命を与えるひずみのばらつきは3500~4000×10-6と比較的小さな結果を示した.
(2)WOL試験片によるき裂進展寿命試験では,き裂進展開始までの潜伏期間がなく,き裂進展曲線のばらつきは,学振129委員会基準設定時の共通試験である3.5%NaCl水溶液環境下に比較して小さい結果を示した.
(3)下限界応力拡大係数KISCCの測定には,初期応力拡大係数KIOの影響は小さいが,試験時間には10000時間前後が必要である.
(4)最終荷重解析によるKISCCの値は,荷重測定の問題から誤差が大きく,弾性ボルト解析によるKIf値の採用が推奨された.
(5)KIfのばらつきは比較的大きく,その原因は分枝き裂の発生とき裂進展面の湾曲に起因していることが明らかにされた.
(6)この分枝き裂とき裂進展面の湾曲は,実機での原子力発電用大形低圧タービンロータに観察された破面形態とよい一致を示した.
このように,本共同試験の試験環境は加速試験であるが,実機でのき裂進展形態を再現できており,本研究の試験の結果は実機の寿命評価に対して一つの情報を与えるものである.抄録全体を表示PDF形式でダウンロード (5077K) -
有山 達郎, 磯崎 進市, 岩崎 敏彦, 熊坂 晃1992 年 78 巻 11 号 p. 1650-1657
発行日: 1992/11/01
公開日: 2009/05/29
ジャーナル フリーIn order to develop the prereduction fluidized bed for smelting reduction process, the fluidization and reduction characteristics of iron ore fines with a wide size distribution, such as sinter feed, were examined. As a result, if the superficial gas velocity is kept over than 2 or 4 times of minimum fluidizing velocity, the segregation of coarse particles can be avoided, and it became clear that the appropriate mean residence time to produce prereduced iron ore of about 20-25% reduction degree was from 30 to 60 minutes. On the basis of these results, a hot model of fluidized bed were so designed that the residence time of fine particles could be controlled by the circulating device, and the characteristics of this hot model were experimentally confirmed. Then, the simulation model considering the elutriation rate of fine particles was made to estimate the operating condition. Furthermore, with the analysis by two-phase model, it was found that the gas interchange coefficient has little influence on reduction behavior, and the fundamental design of the distributor for prereduction fluidized bed was investigated.抄録全体を表示PDF形式でダウンロード (1331K) -
沈 峰満, 高橋 礼二郎, 八木 順一郎1992 年 78 巻 11 号 p. 1658-1665
発行日: 1992/11/01
公開日: 2009/05/29
ジャーナル フリーThe methane formation reaction plays an important role in the ironmaking and the chemical processes. However, the reaction rate has not been studied enough for the catalyst of porous reduced iron pellets at elevated temperatures and pressures. In this paper, various parameters affecting the rate of the reaction was investigated in the wide ranges of temperature and pressure for clarifying the mechanism and the rate parameters.
It is consequently found that the reaction rate increased with the increase in the total pressure and the rate was suppressed by carbon dioxide. As for the temperature dependence, the reaction showed the highest rate at about 873 K and the rate decreased in the temperature range over 873 K, because the CH4 formed by the methanation reaction reacted with CO2 to form CO and H2. The effect of the pore structure of reduced iron pellet on the reaction rate can be described by considering the effectiveness factor.
The apparent activation energy and the frequency factor for the rate of methane formation reaction were determined from the experimental data. The expression of the frequency factor contains pressure dependence.抄録全体を表示PDF形式でダウンロード (1180K) -
原 茂太, 石田 哲夫, 菅野 浩至, 荻野 和己1992 年 78 巻 11 号 p. 1666-1673
発行日: 1992/11/01
公開日: 2009/05/29
ジャーナル フリーEquilibrium CO2 partial pressures in the systems BaO-BaCO3 and BaO-BaCO3-BaF2 were measured by using the thermo-balance. The results are summarized as follows,
(1) Dissociation of BaCO3 under PCO2 = 1 atm occurs at 1645 K and the temperature decreases with decreasing the partial pressure of CO2.
(2) Interaction parameter on the assumption of regular solution for BaO-BaCO3 melts changed from -23 kJ/mol at 1598 K to -15 kJ/mol at 1773 K.
(3) Gibbs energy of the reaction BaO (melt) + CO2(g) = BaCO3(melt)ΔG°is given by the following relation,
ΔG°=-0.152T + 279(kJ/mol)
(4) Assuming that BaO-BaCO3-BaF2 melts behave as the regular solution, the calculated values of solubility of CO2 in BaO-BaF2 melts are fairly in good agreement with measured ones except for those under PCO2 = 1 atm.抄録全体を表示PDF形式でダウンロード (1169K) -
中島 邦彦, 内藤 博之, 磯本 雅裕, 岸本 誠, 森 克巳1992 年 78 巻 11 号 p. 1674-1681
発行日: 1992/11/01
公開日: 2009/05/29
ジャーナル フリーThe dissolution rate of alumina was calculated from the decreasing rate of radius of a cylindrical specimen dipped into CaO-SiO2-Al2O3 (BF-type) or Na2O-SiO2 slags. The effects of revolution speed, temperature and slag composition on the dissolution rate were examined. The results are summarized as follows;
(1) The dissolution rate increased with increasing revolution speed. From this result, the dissolution rate was concluded to be limitted by mass transport in slag.
(2) The apparent activation energies of mass transport in BF-type and soda-silicate slags were calculated to be 186 and 113 kJ·mol-1, respectively.
(3) From the EPMA analysis of specimen after experiment, it was observed that some slag penetrated into grain boundary of alumina specimen and a CaO·6Al2O3 compound was produced for CaO-SiO2·Al2O3 slag, but that neither penetration layer nor compound are formed for soda-silicate slags.抄録全体を表示PDF形式でダウンロード (1132K) -
向井 楠宏, 中村 崇, 寺島 英俊1992 年 78 巻 11 号 p. 1682-1689
発行日: 1992/11/01
公開日: 2009/05/29
ジャーナル フリーSlag foaming was directly observed in a CaO-SiO2-Al2O3-FeO slag and Fe-C alloy (C = 4.5 mass%) system using a high temperature X-ray radiographic technique at 1773 K. The foaming behavior was characterized by measuring the index of foaming power <κ1>, the foam life <τ>, the bubble diameter of CO gas <dB>, the CO gas evolution rates during the observations and the wettability between the slag and metal.
The results obtained in the present study were as follows: The index<κ1>; and the foam life <τ> were found to be almost constant during the observations, then the slag foaming behaviour in the system was described by Ito-Fruehan's equation. A small amount of sulphur addition to the system remarkably reduces the CO gas evolution rates. The sulphur addition increases bubble diameter <dB>, which results in the reduction of <κ1>and <τ>. Then the sulphur addition drastically reduces the slag foaming in this system. Therefore, the adjustment of sulfer concentration in the system is one of the most important points for controlling the slag foaming.
Main cause for the increase in the bubble diameter <dB> can be explained from the increase in the contact angle <θ> between slag and metal by the sulphur addition.抄録全体を表示PDF形式でダウンロード (2958K) -
金子 敏行, 松崎 孝文1992 年 78 巻 11 号 p. 1690-1696
発行日: 1992/11/01
公開日: 2009/05/29
ジャーナル フリーRemovals of silicon and phosphorus from hot metal with lime based flux simultaneously have been studied in the experiment of 100 kg scale.
Results obtained in this work are as follow:(1) Silicon content of hot metal at which simultaneous removal of silicon and phosphorus can proceed increases with an increase of feeding rate of oxygen. (2) When oxygen feeding rate is more than 0.88 Nm3/min·t, dephosphorization can proceed even if with low basicity slag like CaO/SiO2 of 2. (3) To proceed simultaneous removal of silicon and phosphorus effectively, it is very important to keep high values of oxygen feeding rate and oxygen potential at slag-metal interface.
Oxygen feeding to top slag is specially effective for increasing an oxygen potential of slag-metal interface.抄録全体を表示PDF形式でダウンロード (1177K) -
若生 昌光, 澤井 隆, 溝口 庄三1992 年 78 巻 11 号 p. 1697-1704
発行日: 1992/11/01
公開日: 2009/05/29
ジャーナル フリーThe behavior of MnS precipitation on oxide particles in low sulphur and low carbon steels was investigated to control the size and the distribution of MnS. The distribution of MnS became uniform by the complex deoxidation with Mn-Si-Zr, of which complex oxides dispersed finely. On the other hand, in the case of carbon deoxidation in vacuum melting, MnS precipitated less uniformly in interdendritic regions. The precipitation ratio of MnS on oxide particles was higher in the cases of Mn-Al, Mn-Si and Mn-Si-Zr deoxidations, but it depended on the oxide composition. Higher precipitation ratio was obtained in the composition range of MnO-SiO2 where liquidus temperature is low and sulphide capacity is high. The small MnS embryo formed on the surface of the liquid oxide according to its solubility limit may act as a nucleus for the further growth of MnS due to diffusion after the solidification of steels.抄録全体を表示PDF形式でダウンロード (5517K) -
水沼 晋, 山崎 達夫, 菊間 敏夫1992 年 78 巻 11 号 p. 1705-1712
発行日: 1992/11/01
公開日: 2009/05/29
ジャーナル フリーConsolidation behavior in pseudo-HIP ( known also as Ceracon) is experimentally investigated using pre-sintered iron-based alloy as a specimen. Pressure transmitting medium is spherical powder of alumina mixed with 5 wt% graphite. Heating temperature is 800-1200°C and pressure of upper punch is 34.7-347 MPa. Obtained results are as follows : Transmitting ratio of applied pressure in the pressure transmitting medium is low and the pressure applied on a specimen is about 1/2 of the applied pressure by upper punch. Maximum density of a specimen achieved is 99.2%. In the range of less than this value, consolidation behavior can be described by the pressure-density equation presented by Shapiro et al. The achieved density in pseudo-HIP is nearly equal to that in HIP, but according to the observation in SEM, the matrix of the cross section of the specimen in pseudo-HIP seems to be less purified than that in HIP. This is because of the difference of consolidating time between in both processes, that is, as the consolidating time in pseudo-HIP is shorter than in HIP, the diffusion of atoms in pseudo-HIP seems to contribute hardly to the increase of the density. Finally, in order to produce a consolidated part of high accurate dimension and good shape, precise setting of a specimen in the die is important.抄録全体を表示PDF形式でダウンロード (7536K) -
中村 峻之, 佐藤 始夫, 田中 純彦1992 年 78 巻 11 号 p. 1713-1720
発行日: 1992/11/01
公開日: 2009/05/29
ジャーナル フリーOn open-coil annealing of cold rolled steel sheet in HNX gas, the gas composition in the furnace are analyzed. On heating, CO, CO2 and hydrocarbons are generated in the atmosphere by combustion and vaporization of the lubricant on the sheet surface. In order to simulate the open-coil annealing, a steel sheet is annealed in CO-CO2-8%H2-N2. Then, the graphite and cementite are formed on the sheet surface. The graphite pollution on the steel surface can be reproduced by the simulative annealing, because the morphology of graphite by the simulative annealing is same as the formed by the open-coil annealing. According to the addition of CO2 in CO-8%H2-N2 atmosphere, the graphite increases incipiently and then decreases, and more addition than the critical CO2 content, which is affected with CO2/CO, suppresses the formation of graphite perfectly. From these results, the graphite on steel surface by annealing in HNX gas atmosphere are formed by the decomposition of CO, and the lubricant for cold rolling is one of the carbon source.抄録全体を表示PDF形式でダウンロード (5124K) -
伏見 慎二, 谷 意公男, 吉岡 英夫, 小林 正敏1992 年 78 巻 11 号 p. 1721-1728
発行日: 1992/11/01
公開日: 2009/05/29
ジャーナル フリーThe effects of varying manufacturing process parameters on the properties of a forge quenched bevel gear after carburizing were examined.
The microstructure, height (L) to diameter (D) ratio of preform, holding time at quenching temperature and corner radius of tooth root were studied.
The following results were obtained (1) Matrix structure of tooth root of gear forged at 850 and 950°C was dual phase structure of martensite and ferrite. The fatigue properties have been correlated to this dual phase structure. (2) Suitable L/D ratio of preform was 1.0. (3) Recrystallization of austenite after forging began at 10 sec and finished at 30 sec. (4) The bending fatigue limit of the corner radius of tooth root was increased 20% by changing from 0.5 mm to 1.0 mm and was 60% higher than the conventionally processed gear.
The results of these tests have led to the development of super fatigue strength bevel gears.抄録全体を表示PDF形式でダウンロード (11824K) -
富士 彰夫, 山谷 勇, 染野 功, 北川 正樹1992 年 78 巻 11 号 p. 1729-1736
発行日: 1992/11/01
公開日: 2009/05/29
ジャーナル フリーCreep crack growth behavior was experimentally investigated at 570°C in 2 1/4Cr-1Mo cast steels, taken out of heavy section components in power boiler plants of which the total service life were longer than 100000 hours. Stress intensity factor, load line displacement rate, C* -integral andQ* -parameter were used as parameters to evaluate the creep crack growth rate. And, degradation of crack growth in aged materials was observed in the evaluations.
In the relationship ofC* -integral or load line displacement rate, and the creep crack growth rate, the so-called tail part, which characterizes the early stage of the test owing to the transient behavior, was considered. The relationship between the minimum of load line displacement rate and fracture life fell on practically a single trend line in terms of Monkman-Grant type equation. It means that the equation is found to be of activation type.
At last, the softening region near crack tip was discussed in the relation of the crack growth resistance.抄録全体を表示PDF形式でダウンロード (2745K) -
宮原 一哉, 〓 東樹, 酒井 英典, 稲波 純一, 細井 祐三1992 年 78 巻 11 号 p. 1737-1744
発行日: 1992/11/01
公開日: 2009/05/29
ジャーナル フリーThe effect of W and V on the high temperature strength properties of 12% Cr-15% Mn austenitic steels was studied from the view point of precipitation hardening and internal stress. The contribution of W addition to the tensile and creep-rupture strength was not so large. By contrast the combined addition of W and V increased the strengthes considerably. These are resulted from the precipitation of fine vanadium nitride (VN) within grains and the enhancement of M23C6 type carbide precipitation at grain boundaries. The V added material had large internal stress value which is considered to be due to dislocation movement disturbed by fine vanadium nitrides.抄録全体を表示PDF形式でダウンロード (3212K) -
草開 清志, 新家 伸一, 早川 到, 大岡 耕之1992 年 78 巻 11 号 p. 1745-1752
発行日: 1992/11/01
公開日: 2010/01/15
ジャーナル フリーThe precipitation and growth behaviors of δ phase in Ni-base superalloy, modified Inconel X-750 type alloy ( X-750 M), have been investigated mainly by opticaland transmission electron microscopy.
The morphology, the crystallography and equilibrium transformation temperatures of the cellular and the Widmanstätten precipitation of γ phase to δ+ γ phases have been discussed.
The obtained results are as follows:
(1) The hardness of X-750 M aged in various conditions closely related to the size and the quantity of γ" and δ precipitates.
(2)The orientation relationship between γ and δ phase in the cellular and the Widmanstätten precipitates was:
{111}γ//{010}δ <110>γ//<100>δ.
(3) The interlamellar spacing in each precipitation mode was inversely proportional to the degree of undercooling below the equilibrium transformation temperature of γ phase to δ+ γ phases.
(4) According to the theory of diffusion controlled eutectoidal growth, the equilibrium transformation temperatures of the cellular and the Widmanstätten precipitation were estimated to be 1279 and 1313 K, respectively. These temperatures were consistent with the experimental tendency.抄録全体を表示PDF形式でダウンロード (1424K)
- |<
- <
- 1
- >
- >|