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73 巻, 16 号
選択された号の論文の23件中1～23を表示しています
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桑原 達朗1987 年 73 巻 16 号 p. 2157-2171
発行日: 1987/12/01
公開日: 2010/01/19
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隅山 兼治, 中村 陽二1987 年 73 巻 16 号 p. 2172-2179
発行日: 1987/12/01
公開日: 2009/06/19
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渡辺 徹1987 年 73 巻 16 号 p. 2180-2186
発行日: 1987/12/01
公開日: 2010/01/19
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岩本 信也1987 年 73 巻 16 号 p. 2187-2196
発行日: 1987/12/01
公開日: 2010/01/18
ジャーナル フリーガス・タービンの高効率化を目指して,特にアメリカのNASAを初めとして,各航空機会社の被覆技術の集大成が行われ,現在の航空機の信頼ある安全飛行が可能となってきた.3～40年にわたる基礎研究が必要であつたことが,拙文にてご理解いただけよう.レーザーを用いた皮膜表面処理など,記載すべき新しい進歩もあったが,紙面に限りあり割愛した.お許しを乞う.抄録全体を表示PDF形式でダウンロード (1761K) -
川並 高雄1987 年 73 巻 16 号 p. 2197-2205
発行日: 1987/12/01
公開日: 2009/06/19
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片桐 衆, 小沢 泰久, 森 一美, 佐野 正道1987 年 73 巻 16 号 p. 2206-2213
発行日: 1987/12/01
公開日: 2009/06/19
ジャーナル フリーA study has been made on the formation of accretion during submerged gas injection into liquid. Cooled nitrogen or helium gas was injected into a water bath or an acetic acid bath through an orifice of 0.1-0.15 cm in diameter located at the vessel bottom made of polyvinyl chloride. Gas jets and accretions were photographed. The strength of the vibration of the vessel were measured by an accelerometer.
In the sonic flow region, a porous cylindrical accretion with a hollow central core was formed. In the subsonic flow region, a porous hemispherical accretion without the central core was observed to form. The vibration of the vessel decreased abruptly when the accretion began to form. The gas and liquid temperatures and the gas flow velocity were found to be determining factors for the critical condition obtained experimentally for the initiation of the accretion. The critical condition was explained reasonably on the basis of a heat transfer model around the orifice exit.抄録全体を表示PDF形式でダウンロード (4571K) -
田村 庸, 中村 成子, 佐野 信雄1987 年 73 巻 16 号 p. 2214-2218
発行日: 1987/12/01
公開日: 2009/06/19
ジャーナル フリーThe redox equilibrium between Mn3+ and Mn2+ in MntO-CaO-SiO2-Al2O3 melts at temperatures ranging from 1 245 to 1 450°C was investigated as a function of composition, oxygen partial pressure close to thatof air.
In the composition range studied, the concentration ratio (%Mn3+)/(%Mn2+) increased with an increase in basicity and in MnO content. As a result, Mn2O3 is inferred to behave as an oxoacid ion such as MnOx(2x-3)- in slag melts. The above mentioned ratio increased proportionally to the approximate fourth root of oxygen partial pressure, as predicted theorically. The enthalpy change of oxidation of Mn2+ to Mn3+was found to be -9 150 cal/mol Mn2+.
In the light of these findings, Mn3+ content in sintered manganese ores and slags for ferromanganese production was discussed in terms of equilibration with the environment.抄録全体を表示PDF形式でダウンロード (608K) -
高島 和希, 頓田 英機, 上野 學, 虎石 龍雄, 宮野 正晴1987 年 73 巻 16 号 p. 2219-2226
発行日: 1987/12/01
公開日: 2009/06/19
ジャーナル フリーExplosive compaction experiments have been performed on water atomized Fe-25Cr-5Al heat resisting alloy powders and an optimum compaction condition was determined. Compactions were made using cylindrically axi-symmetric direct method. The ratio of explosive mass to powder mass (E/M ratio) was changed from 2.75 to 4.5 to vary the compaction pressure and duration time. At E/M ratio less than 3.0, the center of the cylindrical compact was not consolidated. When E/M ratio was over 4.5, a hole and cracks were formed in the compact because of the convergence of the shock wave and the interference of the reflected waves. An optimum E/M ratio was determined between 3.5 and 4.0, where no cracks were formed in the compacts. The specific density ratio of the compact reached 98% under that conditions. Although the tensile strength of as-compacted material was 12 kgf/mm2, the tensile strength was increased to 80 kgf/mm2 by post sintering treatment. Oxidation behavior of the explosively compacted material was comparable to melted and forged material, and superior to conventionally sintered and hot pressed materials. Hardness of the explosively compacted material in the temperature range from 400°C to 1000°C represented higher value than that of the melted and forged material. This result and the high tensile strength mentioned above suggested that the powder boundaries were strengthened by dispersed oxides crashed from the initial powder surface during explosive compaction.抄録全体を表示PDF形式でダウンロード (17796K) -
松本 年男, 西村 孝1987 年 73 巻 16 号 p. 2227-2234
発行日: 1987/12/01
公開日: 2009/06/19
ジャーナル フリーThe objective of this study is to manufacture a near actual-size die-forged Ti-17 (Ti-5Al-2Sn-2Zr-4Cr-4Mo) disk in consideration of its jet engine applications, and to evaluate its mechanical properties, comparing with those of other high strength titanium alloys.
The major results obtained are as follows :
(1) High tensile strengths, ranging 122 to 126 kgf/mm2, were attained, and elongations were over 8 percent at widely sampled locations.
(2) Fracture toughness values were 160 and 210 kgf/mm2·√mm for radial and tangential cracking directions, respectively, which were proved excellent in comparison with those of other high strength titanium alloys.
(3) High cycle fatigue strengths and fatigue crack growth rate, espacially at high stress intensity range, had a great advantage over such a high strength alloy as Ti-6Al-2Sn-4Zr-6Mo. Strain controlled low cycle fatigue properties were equivalent to other widely available titanium alloys.
(4) Creep strengths studied at relatively lower temperatures than 500°C were equivalent or superior to Ti-6Al-2Sn-4Zr-2 Mo with high temperature applications.抄録全体を表示PDF形式でダウンロード (7774K) -
岡 襄二, 岩倉 英昭1987 年 73 巻 16 号 p. 2235-2242
発行日: 1987/12/01
公開日: 2009/06/19
ジャーナル フリーThe effects of type, size and content of metal powders contained in the paint film on weldability, formability and corrosion performances of weldable prepainted steel sheets have been investigated.
Weldability is influenced by all of type, size and content of metal powders in the paint film. Weldability becomes better, as the size of metal powders becomes smaller and/or their content in the paint film becomes larger. The most significant effect is that the addition of hard metal powders such as steel and TiC into the paint film improves weldability to a great extent. Formability is only influenced by the content of metal powders in the paint film, resulting much inferior formability with larger content of metal powders in the paint film. Zinc powders contained in the paint film improve corrosion performances.
Based upon these results, the paint containing steel, zinc and aluminium powders has been formulated and its weldability and formability performances have been compared with the paint containing only zinc powders, changing the content of metal powders in the paint film. It shows that the paint containing 30% by volume in total of steel, zinc and aluminium powders has both much superior weldability and formability than the paint containing only zinc powders.抄録全体を表示PDF形式でダウンロード (2810K) -
重松 信一, 岩井 彦哉1987 年 73 巻 16 号 p. 2243-2250
発行日: 1987/12/01
公開日: 2009/06/19
ジャーナル フリーThe dense wustite plates containing Al2O3 or Al2O3-CaO have been reduced isothermally in H2 gas in the temperature range from 670 to 930°C. In the case that 0.5%Al2O3 are added, all of the added Al2O3 are dissolved in FeO phase. This dissolved Al2O3 promotes the formation of dense iron covering the FeO surface and slows down the reduction rate of FeO phase. In the case that Al2O3 are added above 1%, hercynite precipitates in the samples and accelerates the reduction of FeO phase. The rate of the reduction of the samples containing 5%Al2O3 are slightly larger at the temperatures above 890°C and smaller at the temperatures up to 800°C than that of the pure FeO.
The rate of the reduction of the samples containing Al2O3 and CaO increases with increase in the concentration of the dissolved CaO because the effect of the dissolved CaO that promotes the formation of porous iron layer becomes larger than that the above mentioned effect of the dissolved Al2O3.抄録全体を表示PDF形式でダウンロード (6224K) -
栗林 一彦, 堀内 良1987 年 73 巻 16 号 p. 2251-2258
発行日: 1987/12/01
公開日: 2010/01/18
ジャーナル フリー逆変態オーステナイト(γ)の再結晶温度の高いボロン添加18%Niマルエージ鋼において,γの未再結晶温度域での溶体化処理(未再結晶溶体化処理)のマルテンサイト(α')組織の形態におよぼす影響と,強度との関係を検討し,次のことを明らかにした.
未再結晶溶体化処理の加熱温度の変化によるラスマルテンサイト組織の形態変化は,γ中の転位密度の変化に対応している.また,この形態変化は炭素量を変化させた場合の変化とよく符合している.すなわち,低温域の未再結晶溶体化処理で得られる高密度の転位を含む逆変態γからの変態では,パケット,ブロックという階層的な紐織構成が失われて,0.4% C以上の中,高炭素鋼,合金鋼のラスマルテンサイトとよく似た組織となる.γの中の回復が進行する高温域での未再結晶溶体化処理では,0.1%～0.3% Cの低炭素鋼と類似の組織となり,ブロックは微細化するが,階層的な構成は保たれた組織となる.未再結晶溶体化処理によるα'の強度上昇は,この組織の細分化によって支えられている.γ中の回復の進行に伴つて,α'の強度は低下するが,高温域での未再結晶溶体化処理でも,ブロックの微細化により,再結晶γより生じたα'よりも高い値となる.抄録全体を表示PDF形式でダウンロード (12195K) -
野末 章, 栗林 一彦, 大久 保忠恒, 堀内 良1987 年 73 巻 16 号 p. 2259-2266
発行日: 1987/12/01
公開日: 2010/01/18
ジャーナル フリー18%Niマルエージ鋼の水素脆性試験において,き裂進展速度と応力拡大係数の関係における,領域IIのき裂進展速度におよぼす旧オーステナイト(γ)粒径の影響と,未再結晶溶体化処理の効果について検討を行い,以下のことを明らかにした.
逆変態γの再結晶温度以上で溶体化処理した試料(再結晶溶体化処理材)の領域IIにおけるき裂進展速度は,旧γ粒径の減少とともに低下した.逆変態γの再結晶温度以下で溶体化処理した試料(未再結晶溶体化処理材)では,粗粒鋼のき裂進展速度が著しく低下し,旧γ粒径に対する依存性はほとんどなくなる.未再結晶溶体化処理による水素脆性感受性の低下は,旧γ粒径の減少に伴うブロック幅の減少の場合と同様であり,ブロック境界面積の増加による水素の旧γ粒内でのトラップに起因するものと結論された.
本研究の一部は,昭和59年度文部省科学研究補助金奨励研究(A)を受けて行われた.抄録全体を表示PDF形式でダウンロード (10293K) -
野中 勇, 北川 正樹, 大友 暁, 和田 雄作1987 年 73 巻 16 号 p. 2267-2274
発行日: 1987/12/01
公開日: 2009/06/19
ジャーナル フリーThe effect of compressive strain holding on the low cycle fatigue strength of 2 1/4Cr-1Mo steel was investigated at 470°C. Strain holding had generally no influence on the fatigue strength of 2 1/4Cr-1Mo steel, but exceptionally distinct life reduction was observed in the compressive strain holding testsat low strain range. This was considered not to be caused by the creep effects because the life reduction was not observed in the tensile strain holding tests, the value of creep damage calculated was very small and the distinct life reduction was also observed in the zero stress holding tests.
Based on the observation of the oxide film, a mechanism was proposed to explain the distinct life reduction under the compressive strain holding at low strain range. The life reduction is closely related to the acceleration of fatigue crack initiation due to the oxide cracking. The same life reduction was not observed under the tensile strain holding at low strain range because the oxide which only negative strain was applied to was not cracked and at last spalled.
Finally the fatigue life of the fast breeder reactor components was predicted on the basis of the presently proposed mechanism. Consequently the life under the compressive strain holding turned out to be 10% of that of the continuous cycling.抄録全体を表示PDF形式でダウンロード (7715K) -
鈴木 信一, 征矢 勇夫, 新田 宏, 近藤 正雄1987 年 73 巻 16 号 p. 2275-2281
発行日: 1987/12/01
公開日: 2009/06/19
ジャーナル フリーTo improve the fatigue properties of a high strength chain, the relationship between the shape of link and the stress distribution in it has been investigated.
1) Stress in the chain link under load gives different distributions depending upon whether a stud exists or not.
2) Even though the chain link has a stud, the stud does not function under low load when a small gap exists between the link and the stud.
3) Dimple is generated on the inner surface of links owing to studding. When the stud does not function, the stress concentration occurs at the edge of dimple.
4) With increasing the contact area between links, the maximum stress under load decreases.抄録全体を表示PDF形式でダウンロード (2343K) -
鈴木 信一, 森 俊道, 原田 武夫, 大羽 浩1987 年 73 巻 16 号 p. 2282-2289
発行日: 1987/12/01
公開日: 2009/06/19
ジャーナル フリーA high strength chain is manufactured by bending steel bars, flash welding and subsequent heat treatment. The welded zone is generally softer than the base steel. The cause of the softening is clarified in the present report. The method for reducing the softening and improving Charpy impact value of the weld is investigated.
1) The softening takes place because the amounts of C, Mn, Ni, and Cr reduce during welding and consequently the hardenability of the welded zone decreases.
2) When a chain is heat-treated at low austenitizing temperatures, the softening of the welded zone is remarkable.
3) The hardness of the welded zone increases with raising the austenitizing temperature. At 1 050°C of austenitizing temperature the softening is not recognized. This is because the hardnability increases owing to the recovery of carbon concentration by diffusion and the austenite grain growth.
4) The impact value of the welded zone is low when the softening of the welded zone is large. Therefore, it improves with increasing the austenitizing temperature up to 1 000°C, above which the grain growth prevents the improvement of the impact value.抄録全体を表示PDF形式でダウンロード (19886K) -
川嵜 一博, 千葉 貴世, 高岡 憲久, 山崎 隆雄1987 年 73 巻 16 号 p. 2290-2297
発行日: 1987/12/01
公開日: 2009/06/19
ジャーナル フリーIn order to clarify the characteristics of Induction Heating Quenching and Induction Heating Tempering (IHQIHT) as heat-treating process, micro-structure and mechanical properties of quenched and tempered Si-Cr spring steel (SUP12) by IHQIHT as well as by conventional Furnace Heating Quenching and Furnace Heating Tempering (FHQFHT) were investigated.
(1) Micro-structure of IHQIHT material shows finer grain and less decarburization than those of FHQFHT material.
(2) Ductility, toughness, fracture toughness, resistivity to delayed fracture, resistivity to permanent deformation, and fatigue life of IHQIHT material are superior to those of FHQFHT material. In case of SUP 6, SUP 7, SWRH62B, and S45C, IHQIHT materials show superior toughness generally.
(3) It is presumed that fine grain and retained austenite of IHQIHT material are effective for the above strengthening and toughening. However, unobvious points are still remained, because the influences of short time austenitizing and tempering are intertwisted mutually.抄録全体を表示PDF形式でダウンロード (5181K) -
川嵜 一博, 千葉 貴世, 古賀 久喜, 山崎 隆雄1987 年 73 巻 16 号 p. 2298-2305
発行日: 1987/12/01
公開日: 2009/06/19
ジャーナル フリーIt was clearly shown in the previous paper that Induction Heating Quenched and Tempered (IHQIHT) Si-Cr spring steel (SUP12) showed superior mechanical properties to those of conventional Furnace Heating Quenched and Tempered (FHQFHT) material.
So, in order to clarify the effect of grain refining by Induction Heating austenitizing and Quenching (IHQ) for the superior mechanical properties of IHQIHT material, the relation between austenitizing conditions and both grain size and mechanical properties were investigated.
(1) Grain refining by IHQ is effective for the improvement of ductility, toughness, resistivity to delayed fracture, and fatigue life.
(2) Short-time heating as well as rapid heating for Induction Heating austenitizing are effective for grain refining and toughening.
(3) However, Induction Heating Tempering (IHT) as well as grain refining by IHQ has favorable influence on superior mechanical properties of IHQIHT material.抄録全体を表示PDF形式でダウンロード (6811K) -
山下 孝子, 角山 浩三1987 年 73 巻 16 号 p. 2306-2313
発行日: 1987/12/01
公開日: 2009/06/19
ジャーナル フリーThe angular distribution measurement of X-ray photoelectron spectroscopy (XPS) proposed by FADLEY et al. is one of the techniques which enable in-depth analysis without ion sputter etching. This technique has been applied mainly to well-defined samples such as vacuum deposits.
This paper describes the application of this technique to the surface analysis of steels : oxide films formed on a low carbon steel and chromate layer on Cr plated steel.
When the oxide films are analyzed by using conventional Ar+ion etching, both of the intensity ratios of Fe2p3/2 to O 1s and the binding energies of Fe2p3/2 obtained for various kinds of iron oxide converge to certain values with the increment of ion dose, which makes it impossible to identify the structure of oxide films. Meanwhile the angular distribution measurement can identify the layered structure of oxide films by adopting a precise elimination of surface contaminants and correction of binding energy of XPS peaks.
In the application of the angular distribution measurement to chromate layers on Cr plated steel, marked effects of the thickness of oxidized layer and the roughness of steel surface are found. It isshown that the effect of thickness is independent of take-off angle, and that the effect of roughness can be eliminated by using an empirical equation.抄録全体を表示PDF形式でダウンロード (1121K) -
北山 實1987 年 73 巻 16 号 p. 2314-2315
発行日: 1987/12/01
公開日: 2009/06/19
ジャーナル フリーPDF形式でダウンロード (359K) -
中村 正和1987 年 73 巻 16 号 p. 2323
発行日: 1987/12/01
公開日: 2009/06/19
ジャーナル フリーPDF形式でダウンロード (211K) -
1987 年 73 巻 16 号 p. N259
発行日: 1987年
公開日: 2009/06/19
ジャーナル フリーPDF形式でダウンロード (166K) -
1987 年 73 巻 16 号 p. N263
発行日: 1987年
公開日: 2009/06/19
ジャーナル フリーPDF形式でダウンロード (170K)
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