著者

小山 元道 秋山 英二 津﨑 兼彰

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.9, pp.1132-1139, 2014 (Released:2014-08-31)

参考文献数

36

被引用文献数

4

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Al effects on strain aging and resistance against hydrogen embrittlement were examined in Fe-18Mn-0.6C-based twinning-induced plasticity steels deformed at different strain rates. The Fe-18Mn-0.6C steel showed hydrogen-induced fracture when it had been pre-deformed at a strain rate of 1.7×10–6 s–1. The hydrogen-induced fracture was suppressed by increasing strain rate and increasing Al content. From the viewpoint of material strengthening by strain aging, we found two important factors improving the resistance to the hydrogen embrittlement; (1) suppression of dynamic strain aging by increasing strain rate and Al content, and (2) suppression of static strain aging under loading by the Al addition.

著者

垣見 恒男 佐藤 博

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.70, no.14, pp.1659-1665, 1984 (Released:2009-06-30)

参考文献数

25

著者

永田 和宏 羽二生 篤 鈴木 卓夫

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.87, no.10, pp.665-672, 2001 (Released:2009-06-19)

参考文献数

15

被引用文献数

2

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The Tatara is the traditional iron-and steelmaking process in Japan. The box type furnace is about 1 m width, 3 m length and 1.2 m height. The process produces steel bloom and pig iron from iron sand and charcoal. The furnace is built on the charcoal bed in a big underground construction which is separated into upper and lower parts by a thick clay layer, "Kobune Kawara". The lower part is a drainage. The upper part has a charcoal bed, "Hondoko", with twin caves, "Kobune", on the both sides. The "Kobune" keeps its temperature lower than 41°C and humidity higher than 89%, that is, 4.8×10-2kg·m-3 in terms of water vapor concentration, during "Tatara" operations. The heat flow and temperature distribution around the furnace during operation was numerically simulated. The water vapor in "Hondoko", hearth and "Doi" flows to "Kobune" according to heat flow and disperses to the surroundings. Further the historical development of underground construction is discussed.

著者

重松 健二郎

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.81, no.2, pp.N66-N69, 1995-02-01 (Released:2009-06-19)

参考文献数

8

被引用文献数

1

著者

滝沢 佳郎 畑 俊彦 遠藤 芳秀

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.70, no.16, pp.2301-2304, 1984-12-01 (Released:2009-06-30)

参考文献数

8

---

Determination of free nitrogen in steel by constant temperature-hydrogen hot extraction method was studied and optimum analytical conditions were established.1) Lower measured values were obtained with samples that had passed for long time after powdering. 2) The result of 1) was considered to come from the fact that dissolved nitrogen in steel was locked to dislocations and/or formed cluster gradually, thus becoming difficult to be extracted. 3) Higher temperature of environment around samples accelerated these effects, so it must be avoided to heat powdered samples for washing and drying. 4) It is necessary to analyse samples of finer powders soon after powdering. 5) When the sample was analysed under these analytical conditions, free nitrogen could be fully extracted at 400°C.

著者

川並 高雄 山本 普康 大木 孝 西山 泰行 市田 弘三郎 村上 靖

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.69, no.13, 1983-09-03

著者

寺門 良二 岩佐 勝 安沢 典男 吉田 言 山口 進 山本 充文

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.69, no.13, 1983-09-03

著者

北村 隆行

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.76, no.8, pp.1400-1401, 1990-08-01

著者

野田 孝昭 和泉 喜久磨

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.77, no.6, pp.723-734, 1991-06-01 (Released:2009-06-19)

参考文献数

20

著者

大黒 竹司 森 玄三 林 登 矢倉 林之助 福島 章

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.50, no.11, pp.1795-1797, 1964-09-01

著者

大黒 竹司 飯浜 宇一郎 林 登 矢倉 林之助 自在丸 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.51, no.4, pp.867-870, 1965-03-01

著者

佐野 謙一

出版者

社団法人日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.73, no.2, pp.380-386, 1987

被引用文献数

2 7

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The effect of loading rate on fracture toughness of 9% Ni steels with four levels of Charpy absorption energy was studied at various loading rates between impact and static at -196&deg;C. In contrast to the ordinary ferritic steel, the fracture toughness of 9% Ni steel was foud to increase with the loading rate above 20mm/min. The transition of the fracture mode from brittle to ductile took place at the loading rate of 100mm/min, the fracture was completely ductile above this level. The dynamic fracture toughness, <I>K</I><SUB>d</SUB>, was greater than the static one, <I>K</I><SUB>c</SUB>. These observations are attributed to the temperature rise at a crack tip during the adiabatic heating at high strain rate, which is emphasized by decreased specific heat and the thermal conductivity at -196&deg;C. The temperature rise during the fracture was measured by a Cu-Constantan thermocouple, and was in good accordance with the previous theoretical prediction. The observed maximum temperature rise was 188&deg;C. The results suggest that not only in 9% Ni steel but in other metals and alloys as well the effect of temperature rise at a crack tip can be an important factor in the dynamic fracture.

著者

鷲見 郁宏 佐々 健介 浅井 滋生

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.78, no.3, pp.447-454, 1992-03-01 (Released:2009-05-29)

参考文献数

11

被引用文献数

3

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Being aimed to improve the surface quality of a continuously cast steel, a new electromagnetic casting method is proposed where the high frequency magnetic field is imposed on the initial stage of solidification from the outside of a mold. The magnetic pressure induced by the magnetic field provides the solidification taking place under the soft contacting pressure of molten metal with the mold, so called soft contacting solidification. Molten tin was cast by imposing magnetic field with 1.75, 3.75 and 15.4 kHz frequency in order to examine the applicability of the method to the cast of steel. It is found that this electromagnetic casting method has a potential to be applied to the cast of steel. The stronger intensity of magnetic field could provide the better surface quality of products in the way of reducing oscillation marks. However, the excess intensity of magnetic field caused the disturbance on meniscus inducing surface defects. The critical intensity of magnetic field at which the surface defects due to fluid disturbances at meniscus appeared increased with increasing the frequency of magnetic field. It is noticed that the effect of magnetic field on reduction of surface defects appears more significantly when mold oscillation was not applied than when the oscillation was applied.

著者

平島 拓弥 荒牧 正俊 山本 正之 安田 恭野 宗藤 伸治 古君 修

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.101, no.5, pp.308-314, 2015 (Released:2015-04-30)

参考文献数

12

被引用文献数

7 6

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Effect of specimen thickness on ductile fracture energy for ferrite-austenite duplex stainless steel was investigated by using tensile strain test. It was revealed that both uniform and local deformation energies decreased with the decrease in the specimen thickness. Voids in a thicker specimen can be easily formed at the lower plastic equivalent strain because of the steep increase in the triaxiality. The decrease in the local deformation energy was due to the void growth near the fracture surface depending on the steep increase in the stress triaxiality.

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.81, no.4, 1995-04-01

著者

飯田 博孝 佐藤 完往 川瀬 尚男 中川 威雄 吉田 清太 加藤 健三 花木 香司 岩根 窓一郎 小門 統一 小野田 義富 松藤 和雄 内田 恭彦 大沢 紘一 泉 稔一 沢井 巌 貝田 邦儀 渡辺 就市 八杉 誠二郎 中尾 信彦 牧野 武久 萩原 康禎 金田 次雄 柳 義親 山上 徹 山口 喜弘 成田 貴一 田阪 興 赤沢 正久 黒岩 和也 野崎 輝彦 大西 稔秦 菅原 宏文 細井 信彦 武田 三雄 浜端 進 吉田 鎮雄 木村 篤良 加藤 剛志 荒川 武二 山本 俊郎 相沢 武 日下 邦男 岩丸 正明 荒木 透 石 茲宜 佐川 竜平 角田 方衛 内山 郁

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.56, no.11, pp.S513-S522, 1970-09-05 (Released:2010-10-12)

著者

久保 善博 佐藤 豊 村川 義行 久保田 邦親

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.91, no.1, pp.83-90, 2005-01-01

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The Japanese traditional steel making method which manufactures steel "Kera" or plg iron "Zuku" from iron sand and charcoal is so called "Tatara" steel making process The influence of the loading ratio of iron sand to charcoal on the "Tatara" steel making was investigated In the case of the loading ratio is equal to 1, high carbon steel "Kera" was produced at the high yield accompanied with viscous slag "Noro" In the meantime, in the case of the loading ratio is equal to 15, the carbon content of the produced steel "Kera" was low at the low yield accompanied with a lot of low viscous slag "Noro" In the case of low loading ratio, so called "light charge", iron sand was well deoxidized and carbonized in the furnace and became to high carbon steel "Kera" at the high efficiently In that case, the slag "Noro" became to viscous one because of the reduction of FeO content on the contrary, in the case of high loading ratio, so called "heavy charge", the deoxidization of iron sand was insufficient and most of iron sand was discharged as a slag "Noro" to the outside of the furnace As the result, produced steel "Kera" yield lowered During the "heavy charge" operation, the composition of the slag "Noro" became FeO-rich, and then the fluidity of the slag "Noro" increased It was clarified that the controlling of the loading ratio was an important factor which affected both to the quality and productivity of steel "Kera" and the fluidity of slag "Noro" on "Tatara" steel making process

著者

谷山 巖

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.26, no.7, pp.511-520, 1940-07-25

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The steel made from sponge iron and loop (Luppe) is generally thought superior to that from steel scraps, because of the former's virgin or fresh quality. However, even such steel wiht virginity, may loose the fresh quality when re-melted. Steel manufacturers are used to add some necessary alloying elements to the base iron, which has not contained any additional elements, in order to obtain the expected result, while they cannot refine such materials as steel scraps as they are which contain the ordinary steel components alone and consequently reveal no chemical reaction. It is suggested that the superiority of sponge iron is, in reality, due to the absence of any other steel mixtures, and not due to the virginity. It is necessary to follow a "dynamic" method in refining the sponge iron with a considerable amount of carbon. The good result would not be obtained by following the ordinary method of refining, even in case where only a little quantity of carbon is present. When steel scraps are used as the original material, the existing components other than iron should be removed first by means of oreing and then necessary elements may be added.

著者

万谷 志郎 的場 幸雄

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.49, no.4, pp.666-672, 1963-04-01 (Released:2010-10-12)

参考文献数

9

被引用文献数

8 7

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Equilibrium of phosphorus-carbon-oxygen in liquid iron in contact with a mixture of solid calcium phosphate and calcium oxide was studied in a controlled gas atomosphere of CO-CO2 gas mixture in the range of 0.03-1.2% of phosphorus in liquid iron at 1530.., 1560.., and 1585... It was found that the stable phase of calcium phosphate was of tetracalcium phosphate, 4CaO.P205, at the presence of free lime in this experiments.The results obtained were summerized as follows: (1)(1b)(1c)(2)(2b)(2c)(3)(3b)(3c)

著者

平賀 譲

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.7, no.5, pp.四〇七-四三六, 1921-05-25