著者

俵 国一

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.5, no.11, pp.1234-1271, 1919-11-25 (Released:2009-07-09)

被引用文献数

1 1

著者

井上 博文 重野 芳人 徳田 昌則 大谷 正康 東口 方也 本吉 実 松永 久 児玉 文男 大矢 龍夫 別所 永康 中西 恭二 江島 彬夫 石坂 邦彦 数土 文夫 香月 淳一 川名 昌志 安藤 遼 中谷 元彦 川見 明 池田 隆果 松尾 亨

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.2, pp.A17-A36, 1978-02-01 (Released:2010-03-15)

被引用文献数

4

著者

中村 泰 徳光 直樹 成田 貴一 佐藤 義智 久次米 章 伊藤 孝道 森 隆資 喜多村 実 熊井 浩 児玉 文男 大堀 佳彦 東口 方也 三好 俊吉 田口 喜代美 白谷 勇介 荒木 英夫 古賀 敬造 大喜多 義道 川見 明 中島 和徳 成田 進 海保 信恵 古崎 宣 増尾 久 尾上 俊雄 石井 照朗 植村 健一郎 加藤 直 平山 俊三 宇野 克洋 三崎 晴夫 桜場 和雅 木村 博則 丸川 雄浄 豊田 守 伊藤 洋一 矢野 芳則 米沢 戴 松原 嘉市 別所 勇 高田 寿

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.60, no.11, pp.S438-S449, 1974-09-10 (Released:2010-10-12)

被引用文献数

4 4

著者

古金 駿 鳥塚 史郎

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.105, no.8, pp.827-836, 2019 (Released:2019-07-31)

参考文献数

46

被引用文献数

8 12

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SUS316L is generally believed as a stable austenitic stainless steel, but strain-induced martensitic transformation can occur when large deformation is given. The predominant mechanisms, especially, in terms of the effect of grain size have been reported, however, it is not still clear. In this study, strain-induced transformation behavior of SUS316L steel was investigated from the points of grain size and dislocation density. Microstructures with various grain sizes and dislocation densities were fabricated by warm multi-pass multi-directional caliber rolling and annealing. Fully recrystallize microstructures with austenite grain sizes of 12, 18 and 27 µm were fabricated. Bimodal structures with ultrafine grains and coarse grains including high density dislocations were also fabricated. These specimens were rolled at a reduction strain from 0.12 to 2.7 at liquid nitrogen temperature to occur enough amount of strain-induced martensitic transformation. To evaluate martensite volume fraction in these cryogenic rolled materials, transmission type X-ray diffraction in synchrotron radiation of Spring-8 was used. Through thick XRD data can be obtained by this method. Regarding fully recrystallized materials, volume fraction of strain-induced martensitic transformation decreased with decreasing in grain size. It is very clear that gran refinement improves the mechanical stability of austenite. On the other hand, regarding bimodal structure, accumulated dislocations promote transformation, and transformation rates were higher with dislocation density at lower reduction strain area. However, saturated volume fractions decreased with decreasing in grain size. Therefore, strain-induced transformation is affected by both grain size and dislocation density having opposite effects, retarding and promoting the transformation.

著者

堀切 政康

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.16, no.10, pp.1063-1086, 1930

著者

川本 正幸 柳楽 知也

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.4, pp.472-484, 2014

被引用文献数

10

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The continuous casting technology of steels in Japan has been well-developed over the past 60 years since the introduction of a continuous casting machine and its technology from Europe. The continuous casting ratio of steels has reached over 98%. A large number of researchers have been conducted on fundamental researches for the improvement of continuous casting technologies. Some of the development histories are summarized in the book, entitled ìHistory of Steel Continuous Casting Technology in Japanî in 1996. In recent years, a near-net-casting has been also developed for higher efficiencies and productivity in many countries. This paper reviews the histories of development in the continuous casting in Japan on technologies regarding (1) Pouring to mold, (2) mold lubrication, (3) cooling of a solidifying shell, (4) machine type, (5) reduction of casting defects, (6) tundish, (7) measurement and control processes and (8) different types continuous castings. The fundamental researches on the major casting defects including macrosegregation, cracking and inclusions that are formed in a continuous casting are also reviewed. Some brief comments on the further development of continuous casting in the future are described.

著者

水崎 基一

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.5, no.6, pp.609-622, 1919

著者

的場 理一郎 中田 伸生 二村 裕一 土山 聡宏 高木 節雄

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.93, no.7, pp.513-517, 2007-07-01 (Released:2009-02-13)

参考文献数

9

被引用文献数

17 16

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The “nominal grain size” (average grain size) is generally applied to Hall-Petch relationship to evaluate grain refinement strengthening in polycrystalline materials. However, the steels with wide grain size distribution (duplex-grained structure) may not deform uniformly but yield preferentially from larger grains to finer ones. This phenomenon is called “micro-yielding”. In this study, the effect of duplex-grained structure on the yield stress was investigated by using some IF steels with different grain size distribution. As a result of tensile testing, the yield stress of duplex-grained steels could be conventionally plotted on the Hall-Petch relationship as a function of (nominal grain size)-1/2 in the range from 100 to 10 μm, even though the micro-yielding phenomenon occurred within the coarse grains at a lower stress than the macroscopic yield stress. When the volume fraction of grains with identical size is summed from larger-sized ones, the summated volume fraction (defined as the integrated volume fraction) always reaches 70-80 vol% at the nominal grain size irrespective of the difference in grain size distribution. These results suggest that polycrystalline materials including duplex-grained structure materials cause the macroscopic yielding when the grains of 70-80 vol% are micro-yielded.

著者

土山 聡宏

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.R20-R21, 2014 (Released:2014-08-31)

参考文献数

2

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.6, pp.566-579, 1920-06-25 (Released:2009-05-26)

著者

今宿 晋 大谷 一誓 河合 潤

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.7, pp.905-910, 2014 (Released:2014-06-30)

参考文献数

23

被引用文献数

1 2

---

We have recently realized an electron probe microanalyzer (EPMA) and cathodoluminescence (CL) spectrometer with a palm-top size chamber including the electron source and the sample stage using a pyroelectric crystal as the electron source. In the present study, we carried out microanalysis and elemental mapping using the portable EPMA and CL spectrometer. As for the portable EPMA, the electron beam bombarded a sample and the wall of the stainless steel chamber due to using a LiTaO3 single crystal with a cuboidal shape. The electron beam was focused on the sample by setting a metal needle on the pyroelectric crystal and covering the needle holder with an insulating material. The spot size of the focused electron beam was 300 μm. We succeeded in elemental analysis in micro-scale region using the focused electron beam. The portable EPMA can also detect light elements such as Mg, Al and Si by introducing the X-ray detector into sample chamber. The portable CL spectrometer can detect ppm order of rare-earth elements in a mineral ore. The portable CL spectrometer can also perform an elemental mapping of rare-earth elements by capturing a CL image with CMOS camera.

著者

鈴木 章 内山 郁 太田 豊彦 飯田 義治 野中 浩 小川 治夫 岡野 忍 成田 貴一 山田 史郎 谷口 政行 久次米 章 鈴木 武 江藤 重任 梅田 洋一 山田 恭暉 武井 格道 島田 春夫 大羽 信夫 長岡 豊 岩田 至弘 小池 与作 満尾 利晴 高見 敏彦 北材 征義 角田 方衛

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.53, no.5, pp.S40-S46, 1967

著者

山﨑 重人 田中 將己 森川 龍哉 渡部 康明 山下 満男 和泉 栄

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-2021-069, (Released:2021-08-05)

参考文献数

46

---

Cleavage fracture of C14 Fe2W Laves phase was investigated using crystal orientation measurement with scanning electron microscopy and first-principles calculations. Trace analysis of the orientations of cleavage planes reveals that cleavage fracture occurred at five types of crystal planes of (0001), {1100}, {1120}, {1101} and {1122}, among which the fracture at (0001) is the most preferable. The first-principle calculations of the surface energy for fracture, Young's modulus, and Poisson's ratio showed that the minimum fracture toughness value of 1.62 MPa·m1/2 was obtained at (0001). The tendency that the values of calculated fracture toughness become larger with the higher indexed planes is almost the same as the frequency of the types of cleavage planes in the trace analysis. It is concluded that the fracture toughness of C14 Fe2W Laves phase is controlled by the surface energy for fracture and Young’s modulus.

著者

河村 驍

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.12, pp.1323-1346, 1919-12-25 (Released:2009-07-09)

著者

藤尾 和樹 山本 厚之 西川 進

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.7, pp.372-377, 2015 (Released:2015-06-30)

参考文献数

11

被引用文献数

3 3

---

Seizure tests were carried out on Ni-Cr-Mo abrasion resistant cast irons containing different amounts of graphite and eutectic carbides. Specimens were prepared with changing Cr and Ni contents based on 2.3% C-1.5% Si- 0.6 Mn- 1.8 Mo iron. Surfaces of the test pieces were finished with mechanical grinding or electro-spark machining up to roughness of Ra:0.30 ~ 0.35. Seizure properties were evaluated with using a high peripheral speed wear tester. Higher load was applied for evaluating seizure property, while lower load was applied for friction coefficient. Weight loss was also measured after testing. Surfaces of the specimen after seizure test were observed with SEM. The specimens with higher amounts of graphite showed lower friction at the early stage of seizure tests. When the testing load was increased, seizure was significantly occurred on the specimen with graphite. The effect of graphite for lubrication was also diminished in the case of wear tests under lower load except the early stage of testing. The electro-spark machining for surface finishing lead to exfoliation of graphite from the surface resulting in increase in friction coefficient. The specimen with higher amount of carbides showed superior wear properties.

著者

青山 兵吉

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.7, no.3, pp.205-211, 1921-03-25 (Released:2009-07-09)

著者

大山 伸幸 岩見 友司 山本 哲也 町田 智 樋口 隆英 佐藤 秀明 佐藤 道貴 武田 幹治 渡辺 芳典 清水 正賢 西岡 浩樹

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.97, no.10, pp.510-518, 2011-10-01 (Released:2011-10-01)

参考文献数

42

被引用文献数

3 8

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JFE Steel Corporation developed the hydrogen-based gas fuel injection technology for sintering machines to improve sinter quality without increasing coke breeze ratio. With the technology, it is possible to extend the temperature zone between 1200°C and 1400°C by injecting the gaseous fuel from the top surface of the sintering machine as a partial substitute for coke breeze. Theoretical and experimental studies were carried out to verify the effect of the gaseous-fuel injection technology on pore structure in the sinter cake with the X-ray CT scanner and sintering pot test.It is important to hold the temperature between 1200°C and 1400°C in order to produce high strength and high reducibility sinter. The liquid phase ratio can be increased with extending the proper temperature zone by applying the gaseous fuel injection technology. The increase in liquid phase ratio promotes the combination of pores (1–5 mm) and sinter strength is improved. At the same time, the pores over 5 mm growth are promoted and the permeability is improved in the sintering bed. Moreover, the low-temperature sintering process depresses the iron ore self-densification. Micro pores under 1 μm remain in unmelted ores and improve sinter reducibility. As a result, the technology enables to improve the pore structure in the sinter cake and sinter quality.The technology was put into commercial operation at Keihin No. 1 sinter plant in January 2009 and stable operation has continued up to the present. As a result, the energy efficiency in the sintering process is greatly improved, and it has been achieved to reduce CO2 emissions by a maximum of approximately 60000 t/year at Keihin No. 1 sinter plant.

著者

村尾 明紀 柏原 佑介 大山 伸幸 佐藤 道貴 渡壁 史朗 山本 耕司 福本 泰洋

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.102, no.11, pp.614-622, 2016 (Released:2016-10-31)

参考文献数

30

被引用文献数

3 4

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Increased gas utilization and improved permeability have been desired in order to achieve low RAR (Reducing Agent Rate) operation of blast furnace. Coke mixed charging in the ore layer is one effective measure for realizing these improvements. A burden distribution control technique for mixing small coke at a blast furnace with a parallel type and center feed type bell-less top were developed and investigated in an experiment with a scale model of an actual blast furnace at JFE Steel. The scale model consists of an ore bin, a coke bin, a surge hopper, belt conveyers, a bell-less top and a model furnace to simulate the charging system of the actual blast furnace. The mixed coke ratio at the furnace top was controlled by the discharge pattern of mixed small coke and ore, and mixing position. The optimum patterns were founded to discharge the small coke from the coke bin after the ore discharged from ore bin in center feed bell-less top, and to discharge the small coke on the ore at front of quarter part overlapped in parallel type bell-less top. These patterns were applied to the actual blast furnace, and the improvement of permeability in a furnace was confirmed by the effect of increase the mixed small coke yield into ore layer.

著者

篠竹 昭彦 内藤 誠章 尾松 保彦 赤木 一志 坪田 淳 村瀬 伸 菊池 善悦 鈴木 啓之

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.3, pp.185-190, 2013 (Released:2013-02-28)

参考文献数

7

被引用文献数

1 2

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In the scrap-melting operation of shaft furnaces, an operation technology with use of 100% small size blast furnace coke for solid fuel instead of typically utilizing foundry coke has been established. An operation technology with use of 100% steel scrap without using return scrap containing 3-4 % carbon for ferrous raw material, and 70% or more of steel scrap consists of shredder scrap, has been established as well.This technology was first developed with one-stage tuyere operations using only lower tuyeres. Next two-stage tuyere operations using lower and upper tuyeres has been developed to explore more efficient operation.In the two-stage tuyere operation, the number of pipes, the diameter, and the protruding length of the upper tuyeres were examined as parameters, an operation technology with high efficiency was established, which enabled us to achieve high productivity and low coke ratio.

著者

的場 幸雄 平田 賢 遠藤 倫正

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.69, no.7, pp.874-879, 1983