巻号一覧
前身誌
71 巻, 8 号
選択された号の論文の19件中1～19を表示しています
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江口 勇1985 年 71 巻 8 号 p. 925-933
発行日: 1985/06/01
公開日: 2009/06/19
ジャーナル フリーPDF形式でダウンロード (2384K) -
郡司 好喜1985 年 71 巻 8 号 p. 934-938
発行日: 1985/06/01
公開日: 2009/06/19
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坂輪 光弘, 真田 雄三1985 年 71 巻 8 号 p. 939-944
発行日: 1985/06/01
公開日: 2009/06/19
ジャーナル フリー石炭は本来高分子有機化合物であるからその構造が解析されれば,利用技術における変化過程は化学反応としてとらえられるはずである.しかし石炭があまりにも複雑すぎるため,このような研究の進め方があまり行われてこなかつたのではないかと思う.
そこで著者らなりの石炭研究の進め方を述べてみる.
まず石炭の組織成分ごとの化学構造の解析を一歩一歩と着実に進め,知見の深化をしていくことではないだろうか.近年,固体状態でも測定できるような有機分析装置の開発が進んでおり,それらをとり入れながら確実に行つていく必要がある.
次にそれと並行して石炭利用技術ごとにその変化過程を化学反応の観点から調べていくことである.たとえばくり返しになるが,石炭を風化させるとそのコークス化性,流動性は著しく変化する.これを化学反応の観点から調べていけば,ある特定のかつ微量の成分が反応に決定的な影響を与えていることが見いだされるかも知れない.
このような研究の進め方により,各利用技術ごとにばらばらに得られていた経験的な特性値がどの技術にも共通なかつ科学的な特性値としてまとめられていくであろう.
ある日,工場長が反応炉内の温度を見ながら,今度は少し芳香族性の高い石炭を装入しようといい,決して石炭銘柄名を言わない時代がくるであろうか.道は遠いが一歩一歩進んでいくしかないであろう.抄録全体を表示PDF形式でダウンロード (2527K) -
関谷 三郎, 望月 俊男1985 年 71 巻 8 号 p. 945-950
発行日: 1985/06/01
公開日: 2009/06/19
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春 富夫, 才野 光男, 奥村 和男, 阪口 泰彦, 稲谷 稔宏1985 年 71 巻 8 号 p. 951-957
発行日: 1985/06/01
公開日: 2009/06/19
ジャーナル フリーIn order to lower the Si content in pig iron, the injection of powder restraining the reduction of SiO2 was examined at Chiba No. 2 Blast Furnace with 1380m3 inner volume and 20 tuyeres.
The powder used is CaCO3 or iron oxide and it was injected through 5 tuyeres of 20 ones.
In case of the injection of CaCO3 powder in 8kg/t-p,
1) Si content in pig iron decreased from 0.84% to 0.68% at 1500°C.
2) S content in pig iron decreased from 0.034% to 0.027% at 1500°C.
3) Si content in fine particles sampled in raceway is less than that without injection of CaCO3 powder.
In case of the injection of iron oxide powder in 32kg/t-p,
1) Si content in pig iron decreased from 0.72% to 0.57% at 1470°C.
2) S content in pig iron increased from 0.04% to 0.05% at 1470°C.
3) Si content in fine particles sampled in raceway is less than that without injection of iron oxide powder.抄録全体を表示PDF形式でダウンロード (755K) -
後藤 和弘, 山口 周, 永田 和宏1985 年 71 巻 8 号 p. 958-964
発行日: 1985/06/01
公開日: 2010/01/18
ジャーナル フリーChemical compositions of slags and steels at the blow-end of LD converter and various top and bottom blown converters have been collected. The number of the samples was 27 in the conventional LD, 75 in LD-OB, 30 in LD-AB, 23 in STB, and 4 in Q-BOP vessels.
The chemical potentials of P, Fe, Mn and O have been calculated in the slags as well as in the steels from the oxygen pressures in slag measured by oxygen sensors.
The magnitude of non-equilibrium between slags and steels tends to decrease with a decrease of carbon content in steels and with an increase of the amount of gas injected from the bottom.抄録全体を表示PDF形式でダウンロード (814K) -
三原 豊, 上野 康, 神尾 寛, 畑中 政之1985 年 71 巻 8 号 p. 965-971
発行日: 1985/06/01
公開日: 2009/06/19
ジャーナル フリーDirect quenching in a seamless tube production mill contributes to a considerable amount of energy saving because a high proportion of the seamless tubes is heat treated. Moreover, it contributes to an improvement of mechanical properties of tubes due to a high hardenability of direct quenching. For its application to a production mill, the most important point is to secure enough temperature of tubes at the quenching zone and to develop a suitable cooling method for on-line quenching. This report refers to temperature evaluation of tubes throughout the rolling process by a theoretical model and also refers to the development of new quenching facilities installed in a new mill. In order to secure high temperature at the end of the rolling train, special rolling processes, such as bar retract operation system in 3-roll transval mill and tandem arrangement of retained mandrel mill with sizing mill, are adopted for the new mill. Those special processes enable the direct quenching even without any reheating furnace. In the processes the uniform and non-deformation cooling system of a long tube up to 29m is accomplished by the rotation of the tube with rapid longitudinal jet flow inside and the curtain wall laminar flow along the outer surface of the tube.抄録全体を表示PDF形式でダウンロード (1029K) -
椿野 晴繁, 水野 哲哉, 山川 宏二1985 年 71 巻 8 号 p. 972-977
発行日: 1985/06/01
公開日: 2009/06/19
ジャーナル フリーA monitoring apparatus and some techniques to measure hydrogen content in line pipe steel over a long term have been developed and established, by using electrochemical permeation method (nickel-plating method).
This monitoring system consists of cells for nickel-plating and monitoring, which are made from acrylic resin, pumping equipment for supply of electrolyte and electronic equipment (YOSHIZAWA type). The cells can be easily set at any position on the external surface of the line pipe. After nickel-plating, the monitoring cell is set and filled with 1N NaOH solution and then the electronic equipment is operated potentiostatically at 150 mV vs Hg/HgO. Anodic current decreases gradually to the value less than 0.04 μA/cm2 within one day. After such preparation, the hydrogen content can be monitored. The detection limit of the hydrogen content by this monitoring system is 0.01 ppm.
The field test for monitoring hydrogen content in line pipe is performed with high reliability over three months.抄録全体を表示PDF形式でダウンロード (3910K) -
亀井 一人, 前原 泰裕, 大森 靖也1985 年 71 巻 8 号 p. 978-985
発行日: 1985/06/01
公開日: 2009/06/19
ジャーナル フリーThe hot deformation of Nb-bearing austenitic stainless steel has been studied by means of tensile test with particular attention to both stacking fault precipitation and dynamic precipitation of NbC. Tensile test was carried out at temperatures ranging from 823 to 1173 K at an initial strain rate of 2.1 × 10-4 s-1.
The results obtained are as follows:
(1) Although the yield strength of the solution-treated specimen was quite low, remarkable work hardening during the deformation occurred at temperatures ranging from 1023 to 1123 K. In this temperature region large ductility trough accompanied by intergranular ductile fracture was also observed. This can be explained in terms of the dynamic precipitation of NbC within the grains as well as on the grain boundaries.
(2) In the aged specimen, on the other hand, the yield strength was much larger than that of solutiontreated one and work hardening during the deformation was less significant. Such a high yield strength can be explained in terms of the "small grains" formed by the hard stacking faults where the fine NbC particles precipitated. The ductility trough in this case was rather shallow because of suppression of dynamic NbC precipitation.
(3) At the temperatures above 1123 K the ductility of the solution-treated specimen increased with increasing deformation temperature, but that of the aged specimen was largely reduced. This ductility loss could be ascribed to the crack formation observed along coherent twin boundaries.抄録全体を表示PDF形式でダウンロード (10815K) -
石黒 徹, 大西 敬三, 渡辺 十郎1985 年 71 巻 8 号 p. 986-993
発行日: 1985/06/01
公開日: 2009/06/19
ジャーナル フリーRecently, larger and thicker reactor vessels have been required in hydrogenation processes in order to search the scale merit and to upgrade the service temperature and pressure. The objective of the present work is to develop a heavy-section Cr-Mo pressure vessel steel with enhanced design stress intensity and higher resistance to hydrogen attack, by conducting a set of experiments with regard to the effect of micro alloying elements.
Effects of Cr, Mo, V, Ti, B and Si were investigated on various properties such as hardenability, tensile strength, impact toughness, creep rupture strength, hydrogen attack susceptibility and weldability. As a results of this alloy modification program, the best composition was found out to be low Si-3%Cr-1% Mo-1/4% V-Ti-B.抄録全体を表示PDF形式でダウンロード (3039K) -
杉本 公一, 坂木 庸晃, 福里 俊郎, 宮川 大海1985 年 71 巻 8 号 p. 994-1001
発行日: 1985/06/01
公開日: 2009/06/19
ジャーナル フリーThe influence of the martensite morphology (the network structure, the isolated island and the finegrained island) on the mechanical properties, particularly initial yielding and strain hardening, of a dualphase steel was examined and discussed on the basis of the micromechanics.
(1) The network structure of martensite increased 0.2% proof stress, ultimate tensile strength and strainhardening rate compared with the isolated martensite island. One of the reasons for this is that the internal stress arising from the difference between the strengths of the ferrite and the martensite was not so much relaxed in the former structure as in the latter one.
(2) A dual-phase steel with fine-grained isolated martensite islands exhibited rather higher 0.2% proof stress and ultimate tensile strength due to mainly fine-grained strengthening, and also the highest uniform and total elongation and reduction of area since the void formation around the martensite islands was suppressed.抄録全体を表示PDF形式でダウンロード (3732K) -
近藤 義宏, 松尾 孝, 田中 良平1985 年 71 巻 8 号 p. 1002-1008
発行日: 1985/06/01
公開日: 2009/06/19
ジャーナル フリーBased on the analysis of many creep data obtained previously from strain dip test to estimate the effective stress of the solid solution strengthened 25Cr-35Ni steels, the increases of the stress exponent of the steady state creep rate, n, and the activation energy for creep, Qc, due to the addition of solute elements were discussed by using the following steady state creep rate equation, namely,
εs ∝ (σa-σf) n0 exp(-Q*c/RT),
where σf is the friction stress, n0 the effective stress exponent of the steady state creep rate and Q*c the activation energy for creep at constant effective stress.
It was suggested that the values of n and Qc could be calculated by considering the applied stress and temperature dependence of the friction stress, respectively.
It was found that the calculated values of n and Qc were in good agreement with those obtained from the creep test.
Then, it was concluded that the change in n with addition of solute elements was mainly attributed to the differences of the effect of various elements on the applied stress dependence of the friction stress and the ratio of the friction stress to the applied stress, while most part of the increase of Qc was explicable by the temperature dependence of the friction stress.抄録全体を表示PDF形式でダウンロード (987K) -
松尾 孝, 大村 圭一, 田中 良平1985 年 71 巻 8 号 p. 1009-1016
発行日: 1985/06/01
公開日: 2010/01/18
ジャーナル フリーIn metallographic study of Ni-20Cr-20W alloy specimens creep ruptured at temperatures of 900 and 1000°C in air, it has been observed that a β-Mn type nitride, π-phase, is formed in contact with α2-W phase precipitated on grain boundary in the vicinity of intergranular cracks. The appearance of the π-phase in the nitrogen free Ni-Cr-W alloy is mainly attributed to the nitrogen in air through the intergranular cracks. And no decreases in creep resistance and rupture elongation were observed due to the precipitation of π-phase.抄録全体を表示PDF形式でダウンロード (9561K) -
酒井 忠迪1985 年 71 巻 8 号 p. 1017-1024
発行日: 1985/06/01
公開日: 2009/06/19
ジャーナル フリーVoid growth caused by hydrogen attack was measured as to the specimens of 21/4Cr-1Mo and 3Cr-1Mo steels with various amounts of impurity elements exposed to hydrogen of 300kgf/cm2 at temperatures from 600 to 550°C. It was confirmed that impurity elements such as P and Sn have strong effects especially on void nucleation. Microanalysis suggested that the nucleation sites were both carbides and MnS in a Sn-bearing steel, while the nucleation at carbides was suppressed in a P-bearing steel. The data on the void growth were extrapolated to lower temperatures at various hydrogen pressures by using the equation led by CHUANG et al. for non-equilibrium void growth. Constants in the equation were determined so that the calculated results fitted the observed data. The extrapolation gave hydrogen attack limit as defined by the conditions in which total void section per unit area of grain boundary attained 5 per cent at 105 h. The limit conditions for 21/4Cr-1Mo and 3Cr-1Mo steels were affected and reversed by impurity elements.抄録全体を表示PDF形式でダウンロード (5669K) -
樋口 洵, 坂本 博1985 年 71 巻 8 号 p. 1025-1031
発行日: 1985/06/01
公開日: 2009/06/19
ジャーナル フリーAn environmental fatigue test machine was developed and axial strain controlled fatigue tests could be conducted in the pressurized high temperature pure water using it. The fatigue life of carbon steel in the environment was investigated.
Results obtained are summarized as follows;
(1) In 250°C pure water containing 8 ppm dissolved oxygen, the fatigue life of carbon steel degraded markedly with decrease in strain rate in the comparatively large strain amplitude (above 0.25%). However, in the small strain amplitude, there was no degradation in fatigue life.
(2) The environmental fatigue degradation was significant in the temperature range of 250°C to 290°C and in the dissolved oxygen contents above 0.2 ppm.
(3) It was supposed that the conspicuous environmental fatigue degradation was caused by the combination effects of SCC and dynamic strain aging.
(4) The prediction method of fatigue life of carbon steel in high temperature water was proposed with considering strain rate.
(5) The environmental correction factor Ken was proposed to correct the design fatigue strength of carbon steel in high temperature water.抄録全体を表示PDF形式でダウンロード (2871K) -
尾崎 敏範, 浅野 浩1985 年 71 巻 8 号 p. 1032-1039
発行日: 1985/06/01
公開日: 2009/06/19
ジャーナル フリーVarious feed water pipes which were used for supplying cooling water to turbines in hydroelectric power stations for three to twenty years showed severe plugging problems because of tuberculation. Beneath tubercles, locally corroded large pits were observed.
Results of water and corrosion product analysis suggest that bacteria might be associated with the tuberculation. Qualitical analysis of the tuberculation suggests the preventive ways of plugging or corrosion penetration.抄録全体を表示PDF形式でダウンロード (7466K) -
丸山 典夫, 角田 方衛, 内山 郁1985 年 71 巻 8 号 p. 1040-1047
発行日: 1985/06/01
公開日: 2010/01/18
ジャーナル フリーThe relationship between the degree of the effect of synthetic sea water in the freely corrosive condition on fatigue crack growth rate (FCGR) and alloying elements has been examined by the multiple regression analysis using 32 kinds of 980-1176 MPa grade steels which were quenched from 850°C and were tempered at 615°C. The maximum value of the ratio of FCGR in sea water at 0.167 Hz to that in air was used as the degree of the effect of sea water on FCGR. The stress ratio of 0.10 was used. The following results are obtained.
1) FCGR of the steel containing more than 1% Cr or containing more than 0.8% Mo is relatively high in sea water because cracks propagate through grain boundaries. However, the addition of less than 1% Cr or of less than 0.8% Mo has no influence on FCGR in sea water.
2) The addition of Si has detrimental influence and the addition of Cu, Mn or Al has beneficial influence on FCGR in sea water.抄録全体を表示PDF形式でダウンロード (2702K) -
宮本 博1985 年 71 巻 8 号 p. 1048-1050
発行日: 1985/06/01
公開日: 2009/06/19
ジャーナル フリーPDF形式でダウンロード (451K) -
福田 光弘, 永田 和宏, 近藤 伸彦, 岸本 哲, 衣川 純一1985 年 71 巻 8 号 p. 1056-1058
発行日: 1985/06/01
公開日: 2009/06/19
ジャーナル フリーPDF形式でダウンロード (592K)
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