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80 巻, 6 号
選択された号の論文の13件中1～13を表示しています
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碓井 建夫, 内藤 誠章, 村山 武昭, 森田 善一郎1994 年 80 巻 6 号 p. 431-439
発行日: 1994/06/01
公開日: 2010/05/07
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高橋 忠明1994 年 80 巻 6 号 p. 440-445
発行日: 1994/06/01
公開日: 2009/06/19
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大西 正已, 若松 良徳, 下崎 敏唯1994 年 80 巻 6 号 p. 446-450
発行日: 1994/06/01
公開日: 2009/06/19
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前田 敬之, 小野 陽一1994 年 80 巻 6 号 p. 451-456
発行日: 1994/06/01
公開日: 2009/06/19
ジャーナル フリー2成分系カルシウムフェライトと4成分系カルシウムフェライトの還元挙動の違いを明らかにするための基礎的研究として,試薬を用い化学組成の異なる2種類のCaO-Fe2O3-Al2O33成分系カルシウムフェライトを合成し,そのCO-CO2混合ガスによる還元経路並びに還元平衡を調べ以下の結果を得た。
(1)Al2O3含有量の多いCaO・3(FexAl1-x)2O3系の3成分系カルシウムフェライトはCaO・Al2O3を析出しながらAl2O3,CaOを固溶したマグネタイト,ウスタイトを経て鉄に還元され,4成分系カルシウムフェライトと還元経路は同じである。還元の各段階の平衡曲線は,純粋なマグネタイトとウスタイトおよび純粋なウスタイトと鉄の平衡曲線をそれぞれ高CO側にシフトした形となり,4成分系カルシウムフェライトの平衡曲線とはほとんど変わらない。
(2) Al2O3含有量の少ないCaO・Fe2O3系の3成分系カルシウムフェライトは純粋なモノカルシウムフェライトと同じ中間生成物が同定され,その還元経路はモノカルシウムフェライトと同じである。還元の各段階の平衡曲線は純粋なモノカルシウムフェライトの平衡曲線をそれぞれ高CO側にシフトした形となる。
(3) (1)と(2)の結果より,2成分系カルシウムフェライトと4成分系カルシウムフェライトの還元挙動が異なるのは,その結晶構造が異なるためであると考えられる。抄録全体を表示PDF形式でダウンロード (3373K) -
芦村 敏克, 森下 紀夫, 井上 義弘, 樋口 宗之, 馬場 昌喜, 金森 健, 和栗 眞次郎1994 年 80 巻 6 号 p. 457-462
発行日: 1994/06/01
公開日: 2009/06/19
ジャーナル フリーA belly probe was newly developed at Oita No. 2 blast furnace. It has the function of observing directly the furnace conditions and measuring the solid temperature by an image fiberscope, identifying and measuring layer structure by a microwave during operation, gas temperature and gas composition measurement and taking burden material samples during scheduled shutdown.
The conditions of the lower part of the furnace during operation were observed successfully. Some knowledge relating to the cohesive zone and its surrounding neighborhood were obtained through our measurements.
The results are summarized as follows:
1) The burden materials were observed layer by layer and were found to occasionally be inclined. The maximum inclination angle was estimated to be about 20 degrees.
2) The coke between the cohesive zone and the deadman was observed, as an image, to be floating. The gas volume flowing in this region was estimated to be about at least one third of the bosh gas volume and the gas volume distribution at the lower part of the furnace was estimated to be relatively large.抄録全体を表示PDF形式でダウンロード (3246K) -
太田 弘道, 増田 稔, 渡辺 啓二, 中島 敬治, 柴田 浩幸, 早稲田 嘉夫1994 年 80 巻 6 号 p. 463-468
発行日: 1994/06/01
公開日: 2009/06/19
ジャーナル フリーThermal diffusivity measurements of continuous casting powders for steel have systematically been made at high temperature by applying the differential three layered laser flash method recently proposed by the present authors. The powder consists of SiO2, Al2O3, MgO, CaO, Na2O and CaF2. New data processing has also been developed in order to separate the contribution due to radiative component from measured values at high temperature by considering the variation of the absorption coefficients of these powders when adding TiO2, ZrO2 or iron oxide. Then, the thermal diffusivity values of continuous casting powders for steel were quantitatively estimated with sufficient reliability. Thermal diffusivity values of continuous casting powders are found to be 4 ± 0.5 × 10-7m2/s and insignificant with the variation of temperature and concentration presently investigated. It would be interesting to extend the present systematic results for discussing the heat transfer phenomena in the continuous casting process for steel.抄録全体を表示PDF形式でダウンロード (1572K) -
山本 重男, 中島 宏興, 宮地 博文1994 年 80 巻 6 号 p. 469-474
発行日: 1994/06/01
公開日: 2009/06/19
ジャーナル フリーA method for estimating the cutting force was studied on the low alloy steels machined with the cutting speed which formed a built-up edge.
At first, the width of the chip shear region(Ws) and the tip radius of the built-up edge(Br) were measured with a micro-machining device. The correlation of them with the hardness of work materials(H) and the cutting speed(V) was obtained.
In the second place, the deformation resistance of the chip shear region (Kfs) and that of the built-up edge(Kfb), which were obtained by the analysis of the previous experimental results, were also correlated with H and V.
Multiple regression analysis was applied between the components of cutting force and the five factors of Br, Ws, Kfs, Kfb and microstructual one. It gave the equations to estimate the cutting forces(principal force, side force and thrust force) from H and V. A good correlation was found between the calculated and the measured values.抄録全体を表示PDF形式でダウンロード (5990K) -
大内 博史, 小林 順一, 石川 忠, 竹澤 博, 江原 隆一郎, 山田 義和1994 年 80 巻 6 号 p. 475-480
発行日: 1994/06/01
公開日: 2009/06/19
ジャーナル フリーThe concentration of diffusible hydrogen introduced into steel, fatigue crack growth rates and fatigue lives were determined in sour crude oil containing a high concentration of hydrogen sulfide and under electrolytic hydrogencharging conditions in neutral solution, using a TMCP high strength steel and a mild steel which are used for ship hull plates. The experimental results demonstrated that the concentration of diffusible hydrogen absorbed into steel was less than 0.1ppm in sour crude oil under atmospheric pressure, and such a small amount of hydrogen accelerated the fatigue crack growth in the high ΔK regime and shortened the fatigue life in the high stress range region, but did not shorten the fatigue life in the low stress region. The electrolytic hydrogen-charging condition appeared to be appropriate as a fatigue-crack-growth test environment to simulate sour crude oil. The deterioration of fatigue characteristics of the TMCP high strength steel was similar to that of the mild steel.抄録全体を表示PDF形式でダウンロード (4361K) -
長谷川 俊永, 土師 利昭, 粟飯原 周二, 岡本 健太郎1994 年 80 巻 6 号 p. 481-486
発行日: 1994/06/01
公開日: 2010/05/07
ジャーナル フリーInfluence of Ni and Mn on toughness of multi-pass weld heat-affected zone (HAZ) in quenched and tempered high strength steels was investigated in order to make clear the metallurgical factors controlling the toughness of the local brittle zone (LBZ) in the HAZ.
Change of simulated HAZ microstructure due to chemical compositions and thermal cycle condition is expressed by a modified hardenability index (SI), which corresponds to ideal critical diameter (DI) taking account of the factors of boron and austenite grain size for the HAZ. Simulated HAZ toughness has good correlation with SI and Ni content. The highest toughness is obtained at optimum SI value (≅ 11) regardless of the chemical compositions and the thermal cycle conditions.
For lower bainite, martensite and their mixtures, cementite which precipitated in the laths of auto-tempered martensite during cooling has a important role for controlling the toughness. But, fracture facet size or retained austenite is not a main controlling factor.抄録全体を表示PDF形式でダウンロード (12586K) -
榎本 正人, 原田 広史, 村上 秀之1994 年 80 巻 6 号 p. 487-492
発行日: 1994/06/01
公開日: 2010/01/18
ジャーナル フリーHigh temperature performance of nickel-base superalloys vitally depends on the constitution of alloys, i.e. volume fraction and composition etc. of constituent phases. The development of computer models to predict the effects of multiple alloying additions on the alloy constitution may facilitate the designing of alloys and lead to further improvement of high temperature performance. Some of the present authors have demonstrated that the cluster variation method with tetrahedron approximation which utilizes the Lennard-Jones pair potential can predict satisfactorily various characteristics of γ'/γ equilibrium in Ni-Al alloys containing one or two alloying elements without excessively increasing the computational load. In this study, calculations are extended to some practical and experimental multicomponent alloys and the results are compared with experimental data on the volume fraction and composition of γ' and γ phases, lattice misfit and site occupation of alloying elements in the γ' lattice. In the present form the model can be used to calculate the constitution of single crystal superalloys in which no interstitial trace elements such as carbon and boron are added to prevent grain boundary embrittlement.抄録全体を表示PDF形式でダウンロード (1377K) -
郡司 好喜1994 年 80 巻 6 号 p. N266-N280
発行日: 1994/06/01
公開日: 2009/06/19
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村山 康幸1994 年 80 巻 6 号 p. N281-N284
発行日: 1994/06/01
公開日: 2009/06/19
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納富 啓1994 年 80 巻 6 号 p. N285-N289
発行日: 1994/06/01
公開日: 2009/06/19
ジャーナル フリーPDF形式でダウンロード (3986K)
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