著者

松下 幸雄 後藤 和弘 長 昭二 五十部 賢次郎 楯 昌久 笹生 宏明

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.52, no.3, pp.393-396, 1966-03-01

著者

吉川 晴十

出版者

一般社団法人 日本鉄鋼協会

雑誌

鐵と鋼 (ISSN:00211575)

巻号頁・発行日

vol.10, no.2, pp.69-124, 1924-02-25 (Released:2009-07-09)

著者

丸山 公一 中村 純也 吉見 享祐

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.100, no.3, pp.414-420, 2014 (Released:2014-02-28)

参考文献数

22

被引用文献数

2

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Conventional time-temperature-parameter (TTP) methods often overestimate long-term creep rupture life of high Cr ferritic steels. The cause of the overestimation is examined paying attention to temperature and stress dependence of creep rupture life of Gr.91, 92 and 122 steels. In stress-rupture data of all the three steels there are four regions with different values of stress exponent n for rupture life. Activation energies Q for rupture life in the regions take at least three different values. The values of n and Q decrease in a longer-term region. The decrease in Q value is the cause of the overestimation of long-term rupture life predicted by the conventional TTP methods unable to deal with the change in Q value. Therefore, before applying a TTP analysis to stress-rupture data, the data should be divided into several data sets so that Q value is unique in each divided data set. When this multi-region analysis is adopted, all the data points of the steels can be described with higher accuracy, and their long-term rupture life can be evaluated more correctly.

著者

飛鷹 秀幸 木村 勇次 高木 節雄

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.85, no.1, pp.52-58, 1999-01-01

被引用文献数

6

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Mechanical milling using high energy planetary ball mill was applied to Fe-C alloy powders with (ferrite+cementite) two-phase structures to give an ultimate large strain into the powders. Dissolution behavior of cementite during mechanical milling was investigated in relation to ultra grain refining of ferrite matrix, and dissolution capacity of cementite was discussed in terms of carbon content in the powders. Ultra grain refining of ferrite matrix to about 10nm results in full dissolution of cementite in the powders with carbon up to 2 mass% C. Most of carbon, which has been rejected from decomposed cementite, is suggested to segregate at grain boundary to form amorphous layer. Thus, it was proposed that the dissolution limit of cementite depends on both volume fraction of the grain boundary amorphous layer and carbon concentration therein. For example, as the maximum carbon content of the grain boundary amorphous layer was to be about 4.2 mass% C, the dissolution limit of cementite was estimated at 30 vol% from the mass valance for carbon content in the case ferrite grains were refined to around 10nm. This volume fraction of cementite is just correspondent to that in Fe-2mass%C alloy.

著者

永澤 清

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.19, no.3, pp.174-196, 1933-03-25

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In this investigation, a statistic survey on the phenomenon of temper-brittleness is made with 164 actual charges of plain carbon and special steels. The results show that the temper-brittleness is primarily related to the constitution of steel. The elements Cr, Mn, Si, Ni and P are confirmed to promote the phenomenon. Closer observation of the phenomena reveals the fact that there are two kinds of temper-brittleness : - the one is observed at the tempering range 450°∿525°, and is not affected by the rate of cooling after tempering, while the other occurs above 525° and shows the vast difference in the impact value between rapidly cooled and slowly cooled samples ; which has hitherto been known as the temper-brittleness. To distinguish these two kinds of temper-brittleness the present authur has called the former as the "First Temper-Brittleness" and the latter as the "Second Temper-Brittleness" respectively. The so-called carbide theory has been developed. When martensite, a super-saturated solid solution f carbide, is tempered, the precipitation of the carbide occurs at the tempering range 450°∿525°. This precipitation is the cause of the first temper-brittleness ; at the tempering temperature above 525° the redissolution of the precipitated carbide bigins to take place as the result of the increaing solubility of the carbide in α-iron. This causes the difference of impact value between rapid and slow coeled samples, that is the second temper-brittleness. The carbide, which causes the temper-bittleness, is ascertained to be Fe_3C or its solid solid solution ; and it is considered that the occurence of the temper-brittleness in steels depends on the correlation of these carbides and α phase. It is possible, in all steels, to observe more or less the first temper-brittleness, which is considered to be the combined effect of Si, Mn, P and eventually Cr present in the steels. It has often been reported that even in the case of samples having an identical composition and subjected to the same heat treatment, there is a great variation in the susceptibility of the temper-brittleness. The present authur believes that this is due to the existing oxides in the steels, and the more the oxides present, the larger the ratio of the susceptibility. The remeding action of Mo and W is confirmed in the temper-brittleness of several steels, and its mechanismis is described.

著者

小林 佐三郎

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.22, no.9, pp.688-702, 1936-09-25

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(A) Silicate inclusion. 1) The author investigated on the silicate inclusion of steel from melt to ingot by Dickenson method. 2) Silicate are diminished when the slag composition is higher acidic and the oxygen contents of molten steel is small. 3) Also, silicates are decreased by the use of Si-Mn and Fe-Ti as deoxidiser. 4) Addition of Fe-Mn during the boiling period is effective for diminition of silicate. 5) Generally, silicates of ingot show maximum value at inside of the bottom and outside of the top. 6) Large Mn-silicate remains in ingot when the addition of Mn is too much (B) Flakes. 1) Existence of flakes can be detected by deep etching with alcoholic solution of HNO_3. 2) Segregations, cracks and low-silica-silicates of ingot give much effect on the formation of flakes. 3) Forged steels in which flakes appear, have partially martensitic structure caused by segregation of alloying elements. 4) Slow cooling after forging is most effective for prevention of flakes.

著者

田中 義人 達脇 正雄 阿澄 一寛 高間館 千春 堀田 一之 岡田 道雄 新谷 進

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.68, no.12, 1982-08-20

著者

向井 楠宏 増田 竜彦 吉富 丈記 原田 力 藤本 章一郎

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.70, no.8, pp.823-830, 1984-06-01

被引用文献数

10

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Laboratory corrosion test of clay-bonded SiC specimen at the slag surface has been carried out in argon, argon-oxygen and air, in order to elucidate the mechanism of local attack of blast-furnace-trough material at the slag surface. The local corrosion arises only in the oxidizing atmosphere in the narrow zone just above the slag surface. The corrosion zone of solidified specimen during the progress of the corrosion is covered with thin liquid slag film. Supplying rate of oxygen from the atmosphere gives remarkable influences on the relations between the corrosion rate and dipping times, slag compositions, etc. It is estimated that the slag film, crept up from the bulk slag, plays important roles in the occurence of the local corrosion by accelerating mass transfer and causing the abrasion of the specimen due to its active movements in diffusion layer caused by Marangoni effect. SiC granules on the surface of the specimen are oxidized by iron oxide in the film into carbon granules, which causes Marangoni effect and also facilitates the dissolution and abrasion of the specimen. Some countermeasures against the local corrosion have been offered from the corrosion mechanism.

著者

横川 孝男 石黒 隆義 半沢 貢 征矢 勇夫 横田 彦二郎

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.64, no.4, 1978-03-03

被引用文献数

1

著者

青木 裕幸 武田 欣明 中嶋 睦生 迫村 良一 笹川 正智 半澤 和文

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.71, no.12, 1985-09-05

被引用文献数

1

著者

西澤 泰二

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.75, no.12, pp.2137-2138, 1989-12-01

著者

紙川 尚也 阿部 吉剛 宮本 吾郎 船川 義正 古原 忠

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.99, no.5, pp.352-361, 2013 (Released:2013-04-30)

参考文献数

46

被引用文献数

3 6

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Tensile behavior and structure-property relationship of ferritic steels with nano-sized carbide dispersion were invesigated using Ti-added steel and Ti,Mo-added low carbon steels. By austenitizing followed by isothermal heat treatment at 700°C, polygonal ferrites containing very fine carbides of TiC and (Ti,Mo) C were obtained in the Ti-added and the Ti,Mo-added steels, respectively. The size of such carbides was finer in the Ti,Mo-added steel than in the Ti-added steel at the same holding period of isothermal heat treatment. The results of tensile tests for these samples showed that the strength is higher as the diameter of the carbides is smaller. The structure-based strength calculation led to a good agreement with the experiments, when it was assumed that the Ashby-Orowan mechanism is dominant for precipitation strengthening of nano-sized alloy carbides. It was also suggested that a relatively large tensile ductility is related to enhanced recovery during the tensile deformation, accompanied with promotion of secondary slips or cross slips in a finer scale due to the nano-sized particles.

著者

植田 芳信 佐山 惣吾 西川 泰則 鈴木 良和 信岡 聡一郎

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.68, no.14, pp.2046-2048, 1982 (Released:2009-06-19)

被引用文献数

3

著者

山岸 静直 半明 正之 小倉 英彦 田巻 直 外村 勝生 船越 邦治

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.68, no.11, 1982-08-20

著者

柳本 左門 玉野 敏隆

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.56, no.8, pp.1118-1135, 1970-07-01

著者

木村 久雄 小川 勤 柿木 充 松本 新 濱野 翼 月橋 文孝

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.92, no.12, pp.748-754, 2006-12-01

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Phase diagrams for the CaO-SiO_2-FeO_x-Al_2O_3 or -MgO systems at various oxygen partial pressures are necessary for the design of raw material for ironmaking, the analysis of smelting reaction and sintering process. To clarify the effect of Al_2O_3 or MgO content on the formation of melts in the sintering process is important for the development of new sinter. In this study, liquidus for the CaO-SiO_2-FeO_x-Al_2O_3 or -MgO systems at various oxygen partial pressures were observed at 1573K by using chemical equilibration technique. The liquid phase area changed with adding Al_2O_3 or MgO. The effect of the Fe^<3+>/Fe^<2+> ratio on the melting mechanism is discussed.

著者

藤井 孝一 石川 遼平 川見 明 瓜生 裕一

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.62, no.4, 1976-03-10

著者

中田 等 山内 学 森西 義章 増田 薫

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.89, no.4, pp.393-400, 2003-04

被引用文献数

2

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For the purpose of reducing CO_2 contents in the atmosphere, one of the solution is said to grow the biomass of phytoplankton by it's photosynthesis, that is enhances it's biological pump. When steelmaking slag is applied to the sea, the nutrient like phosphate and silicate, and ferrous ion as a micro nutrient, which is indispensable for the growth of phytoplankton, especially diatoms, is considered to be supplied sufficiently. This time, large tank test adding steelmaking slag was carried out, and increase behavior of phytoplankton was investigated. And at the same time, the behavior of various kinds of chemical elements which dissolves from steelmaking slag to the sea water examined in detail. The results show that contamination problems from the steelmaking slag which was applied to this experiment cannot be recognized. Behavior of dissolved element is compared to some experimental systems, for example, large tank test and beaker test etc., using analytical model. Furthermore, three dimensional simulation of dissolved nutrients from steelmaking slag was also investigated.

著者

坪井 善勝

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.52, no.1, pp.65-77, 1966-01-01

著者

池島 俊雄

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.65, no.10, pp.1644-1650, 1979-09-01

被引用文献数

2