著者

片岡 由行 森川 敦史 古主 泰子 牧田 正弘 吉永 亨二 木戸 直範

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.105, no.5, pp.560-565, 2019 (Released:2019-04-30)

参考文献数

4

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An accurate quantitative analysis method including total iron had been proposed for the iron ore analysis by wavelength dispersive X-ray fluorescence spectrometry using fusion method and was accepted at ISO TC 102 meeting in 2010. The project has been proceeded in ISO TC 102/SC 2/WG54 as ISO/WD 9516-2 project. Number of covered elements is 19, and 14 elements among them including total iron are for referee analysis. The calibration discs are prepared only from reagents and the calibration equation includes coexisting component correction, overlap correction, flux/sample and oxidizer/sample mixing ratio corrections. The coexisting component correction method is based on the absorption/enhancement correction coefficients obtained by a FP (fundamental parameter) method so that LOI (loss on ignition) and GOI (gain on ignition) during fusion do not affect to analyzed results. In the verification experiments with 20 certified reference materials, the accuracy obtained by root mean square of the difference between certified values and analyzed values using proposed method was 0.14 mass%, which indicated analytical accuracy could be greatly improved compared with the existing method. For the other components, the values of accuracy obtained were almost same as the existing method. We are conducting final round-robin test in foreign laboratories and have a plan to set the method as an ISO standard.

著者

吉田 清太

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.63, no.9, pp.1588-1596, 1977-08-01 (Released:2010-03-15)

被引用文献数

2

著者

宮島 明 山田 健夫 安藤 静吾 国岡 計夫 杉山 峻一 神尾 寛 島田 勝彦 角崎 周市 富川 隆信 山田 正義 小峰 勇 米谷 捻 角崎 周市 山田 正義 田辺 英也 森田 博之 入谷 正夫 宇野 義雄 手塚 栄 吉田 謙吾 小橋 正満 山田 信男 宮崎 四郎 西出 輝幸 浜田 一明 小西 敏弘 藤原 洋一 上田 正美 東 良学 片山 知行 高橋 昭夫 吉村 清信 土屋 安夫 天野 虔一 佐藤 俊彦 桑島 英明 浜島 吉男 高橋 亮一 川野 晴雄 横井 玉雄 成合 靖正 高力 満 鎌田 晃郎 高野 道典 山口 久 寺本 和啓 中山 武典

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.64, no.4, pp.S245-S256, 1978

著者

岩瀬 慶三 福島 政治 三井 三郎

出版者

The Iron and Steel Institute of Japan

雑誌

鐵と鋼 (ISSN:00211575)

巻号頁・発行日

vol.22, no.10, pp.769-773, 1936-10-25 (Released:2009-07-09)

参考文献数

2

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On the Irreversibility of Gas Absorption found in various kinds of Irons. Gas absorption experiment has been carried out with various kinds of iron and its alloys to investigate the effect of impurity and heat treatment. The result of experiment show that virgin iron, when it contains no other metallic element, behaves toward gas reversibly, while impure iron behaves toward gas irreversibly. That is, pure iron absorbs the same quantity of gas whether it is once heated in the gas or not while impure iron absorbs the gas in less amount when it is once heated in the gas in comparison with the virgin iron.

著者

安田 洋平 下川 智嗣 大橋 鉄也 新山 友暁

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

pp.TETSU-2018-082, (Released:2018-11-01)

参考文献数

27

被引用文献数

2

---

Strain hardening behavior of ferrite layers in the microstructure of drawn pearlite wire is studied theoretically and numerically. It is shown that stress field associated to dislocations could diminish quickly if the dislocations enter the phase or grain boundaries and decompose into smaller segments to distribute along the boundary. Some atomistic simulations of single-phase media validate this phenomenon; dislocations show to pass, decompose or accumulate on tilt-type grain boundaries depending on their atomistic configuration. Mechanical responses of nine-layered pearlite models subjected to tensile load are analyzed by a strain gradient crystal plasticity finite element code, where possible passage or absorption of dislocations is expressed in the model of dislocation mean free path. The critical resolved shear stress for slip systems consists of the lattice friction, the Taylor and Orowan terms and the strain hardening is given by the Taylor one. The density evolution of accumulated dislocations is evaluated by the model of Kocks and Mecking where the dislocation mean free path plays a major role. Results show that the smaller the dislocation absorption ability of the phase boundary and thinner the layer thickness, larger the strain hardening becomes. Slip localization in cementite layers is shown to be suppressed when the strain hardening of ferrite layers is higher, and this trend is consistent with results obtained in previous studies by molecular dynamics simulation and classical elasto-plasticity analyses. Scale sensitive phenomena taking place at phase boundaries in layered structure are briefly discussed in views of atomistic process and continuum mechanics.

著者

雨宮 雄太郎 中田 伸生 諸岡 聡 小坂 誠 加藤 雅治

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.105, no.2, pp.314-323, 2019 (Released:2019-01-31)

参考文献数

28

被引用文献数

5

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For deeper understanding of a dynamic accommodation mechanism of internal stress in pearlite originated from the lattice misfit between ferrite and cementite phases, the lattice parameter ratios of cementite, bθ/aθ and cθ/aθ, were locally analyzed in detail by using the electron backscatter diffraction (EBSD) technique. The EBSD analysis has revealed that lattice parameter ratios of cementite lamellae obviously differ from those of spheroidized cementite particles, which demonstrates that pearlite has a certain amount of internal stress as long as it maintains lamellar structure. The internal stress in pearlite gradually decreased during isothermal holding at 923 K after pearlitic transformation due to interfacial atomic diffusion of iron atoms. However, comparing with theoretical values under Pitsch-Petch orientation relationship, it was understood that large amount of internal stress had been already accommodated upon pearlitic transformation by introduction of misfit dislocations and structural ledges on ferrite/cementite lamellar interfaces. That is, the internal stress of pearlite is dynamically reduced by two different processes; built-in accommodation upon pearlitic transformation and additional time-dependent relaxation after pearlitic transformation. On the other hand, EBSD analysis and neutron diffraction technique gave remarkably different lattice parameters of cementite. From this result, it is concluded that various crystallographic orientation relationships between ferrite and cementite coexist in pearlite. Furthermore, elastic strain energy analysis suggests that the invariant-line criterion on ferrite/cementite interface plays an important role for the selection of orientation relationships in pearlite.

著者

阿部 芳平

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.76, no.12, pp.2059-2064, 1990-12-01 (Released:2009-06-30)

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The report discusses the recent development of spring steel in Japan during last 40 years. There has been a great increase in this steel production with the increase of production of automobiles. The technical trends of spring steel and springs are discussed in connection with hardenability, fatigue, high-stressed design and productivity. Especially, ways of improvement of performance of springs for suspention of automobiles were studied in respect to chemical composition, heat-treatment and manufacturing process.

著者

亀本 喬司

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.76, no.3, pp.320-328, 1990-03-01 (Released:2009-06-30)

参考文献数

26

被引用文献数

2 2

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流れの中に渦が発生するメカニズムは,流れの初期条件や境界条件によってかなり相違があるが,本質的には渦度がどのように供給され,それらがどのように流れるかによっていることは本文に説明したとおりである. 自然界における空気や水の流れを見ても,渦を伴わないものはほとんど無いと言っても過言ではない.技術の粋を集めて作られた航空機でもひとたび設計条件からはずれると,Fig.7に示したような流れの剥離により失速状態に陥ることもあり,渦とはこれほど発生しやすいものと考えたほうが良さそうである.流れにおける渦の生成を,さまざまな条件下で意のままにコントロールできたとすれば,それは正に人間にとって夢の実現に値するものである.鳥や魚のように,渦無しの流れと渦放出を巧みに使い分けることもできるし,台風やたつ巻の,発生や進路を自由に制御することもできるようになる.流れにおける渦の生成に関する研究を行っていると,流体が時として生き物のように感じられ,「流れは, 自身の姿を自由に変え,常に流れやすいように流れている」ように見えてくる.要は,「流れの気持ち」が理解できるようになることであろうか.溶けた鉄の流れがどのような性質を持つ生き物なのかについては,ご専門の技術者や研究者の方々が解き明かしてくださるものと楽しみにしている.この分野の方々にとって,本文が多少なりともご参考になれば幸いである.

著者

浅井 斉 松田 行雄 橋角 真佐男 鶴田 武 園田 栄

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

小豆島 明 喜多 良彦 山口 一男 住友 正実

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.72, no.12, 1986-09-09

著者

鍬本 紘 岩藤 秀一 坂本 章 神馬 照正 岡見 雄二

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.67, no.4, 1981-03-05

著者

加納 勝雄 車野 巧悦 松田 行雄 田辺 真三 園田 栄

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

水崎 基一

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.5, no.6, pp.六〇九-六二二, 1919-06-25

著者

俵 国

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.5, no.4, pp.400-408, 1919-04-25 (Released:2009-07-09)

被引用文献数

1 1

著者

俵 國一

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.6, no.3, pp.253-269, 1920-03-25 (Released:2009-07-09)

著者

藤城 泰志 原 卓也 重里 元一

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.300-307, 2015 (Released:2015-04-30)

参考文献数

25

被引用文献数

2 12

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Effect of the combined addition of molybdenum (Mo) and boron (B) on austenite (γ) to ferrite (α) transformation and precipitation behavior were investigated using low-alloy steels. B-added steel and Mo-B combined steel were held at 923 K (γ region) in order to precipitate boride. B content as precipitates increased and γ to α transformation was promoted with holding time at 923 K. In B-added steel, both M23(C,B)6 and M2B were observed. The transition from M23(C,B)6 to M2B caused by the increase in holding time at 923 K. By contrast, in Mo-B combined steel, no M2B was observed regardless of the holding time. Mo addition suppresses not only the M23(C,B)6 formation but also the M2B formation. M2B contains larger amounts of B than M23(C,B)6. B content as precipitates in Mo-B combined steel was much lower than that in B-added steel due to the suppression of M2B precipitates. The effect of Mo for B containing steel suppresses the precipitation of M23(C,B)6 and M2B and increases more segregated B in austenite grain boundary that contributes to γ to α transformation.

著者

植森 龍治 向井 俊夫 谷野 満

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.77, no.11, pp.2060-2067, 1991-11-01 (Released:2009-06-19)

参考文献数

20

被引用文献数

1 1

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Partition of alloying elements between spinodally-decomposed phases in Fe-Cr-Co-Si alloys was examined by Atom-Probe Field-Ion Microscope (AP-FIM). The results showed that the ferromagnetic particle (α1) is rich in Fe and Co, and the weak-ferromagnetic matrix (α2) rich in Cr and Si. The enrichment of Si in the α2 phase was explained through thermodynamical considerations. Si is more strongly bonded to Cr than to Fe. The improvement of hard magnetic properties by Si additions was found and discussed in terms of the changes in saturation magnetization of the α1 and α2 phases. The increase in coercive force may be mainly attributed to the reduction of saturation magnetization of the α2 phase by the addition of Si.

著者

前原 泰裕 小池 正夫 藤野 允克 邦武 立郎

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.67, no.3, pp.577-586, 1981-03-01 (Released:2010-01-18)

参考文献数

33

被引用文献数

11 27

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Precipitation of σ phase in an Fe-25Cr-7Ni-3Mo alloy with a duplex structure of α and γ phases, has been studied systematically by means of optical microscopy, X-ray diffraction, hardness measurement, tensile test, SEM observation and dilatometric measurement. The results obtained in this study are as follows: (1) TTT diagram for the precipitation of σ phase was a C-type with a nose at about 820°C and 2030 min. (2) σ phase nucleated on the α/γ boundaries and grew into α grains, and thereafter the nucleation of σ and new γ phases began also in α grains. Volume fraction of α phase decreased and that of γ phase increased with increasing σ phase. Precipitation of σ phase occurred by the reaction, α→σ+γ. It was found that Cr, Mo and W were concentrated into α phase. (3) Increase of hardness with precipitation of α phase was not so large, on the contrary, impact value decreased drastically even at a few percent precipitation of α phase. α phase was also found to be harmful for hot ductility. (4) The precipitation range during cooling were about 700900°C and a phase precipitation could be avoided if cooling rate were larger than about 20°C/min after solution treatment. It was clarified from the above results that α embrittlement during production of duplex phase stainless steels could be avoided by selecting adequate manufacturing conditions.

著者

丹羽 貴知蔵 横川 敏雄 森 一美 堤 正克 川合 亜之 藤井 毅彦 荒木 泰治 丸川 雄浄 川上 公成 岡崎 有登 松野 淳一 岡野 忍

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.52, no.3, pp.505-519, 1966-03-01 (Released:2010-10-12)

被引用文献数

3

著者

都築 信男 古野 英樹 江藤 哲雄 岩本 勉 上野 和男 植松 伸夫

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.13, 1984-09-05

被引用文献数

1