著者

神野 憲博 濱田 純一 金子 賢治

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.103, no.9, pp.539-548, 2017 (Released:2017-08-31)

参考文献数

50

被引用文献数

1

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In this study, Cu-added ferritic stainless steel sheets were investigated to understand the influences of Cu contents on the high-temperature strength during the high-temperature deformation. High-temperature proof stress at 700~900°C was improved greatly by addition of more than 1% of Cu. In the case of static aging at 900°C, the rod-shaped ε-Cu particles satisfied the K-S orientation relationship with the α matrix, but spherical-shaped ε-Cu particles without specific orientation relationship started appearing during the tensile deformation at 900°C. Similarly, the spherical-shaped and fine ε-Cu particles were observed during the thermal fatigue process in the temperature range from 200°C to 700°C with a 50% restriction ratio. During the observation using the high-temperature in-situ TEM straining, it was clarified that the ε-Cu particles were divided by dislocation shearing and parts of them were found dissolved. According to the LSW theory, it was suggested that the microstructure with fine and spherical-shaped ε-Cu particles was formed by the repetition of dissolution and precipitation during the high-temperature deformation.

著者

土田 紀之 大倉 誠史 田中 孝明 田路 勇樹

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.103, no.10, pp.597-605, 2017 (Released:2017-09-30)

参考文献数

39

被引用文献数

3

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High-speed deformation behavior and their strain rate dependence on mechanical properties of 1 GPa-grade TRIP-aided multi-phase (TRIP) steels were studied. The strain rate range in this study was between 3.3×10–6 and 103 s–1, and the effect of retained austenite (γR) shapes on TRIP effect in the 1 GPa-grade TRIP steel was also focused on. The effects of strain rate on tensile strength and flow stress in the TRIP steels were small whereas that on uniform elongation was large. The strain rate dependences on tensile strength and uniform elongation in the TRIP steels were more closely to those of the metastable austenitic stainless steels than the conventional TRIP and dual-phase steels. The 1 GPa-grade TRIP steel with the γR shape of needle-like showed better tensile properties and absorbed energy in the present strain rate range. The volume fraction of γR more than 20% and the matrix microstructure of martensite seem to be important factors in the high-strength TRIP steels.

著者

成田 貴一 前川 昌大

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.63, no.9, pp.1443-1452, 1977-08-01

被引用文献数

1 1

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An investigation has been carried out on the behavior of pellets during the reduction in the lower part of blast furnace. Pellets samples taken from an industrial blast furnace were large and very hard masses, whose section showed a zonal structure ; a spherical envelope of metallic iron was formed in the external part of each pellet and unreduced core remains in the central part. When pellets become such a large mass with unreduced ore in the blast furnace, this core must be reduced by direct reduction in the liquid state after melting of this mass. In consequence, the blast furnace performance becomes undesirable, with an increase of coke rate, for example. We have studied therefore, in the first step, on the properties of pellets samples taken from the blast furnace and, in the second step, on the condition on metallic iron shell formation and its mutual cohesion in order to obtain the fundamental data. The results obtained are as follows : (1) The chemical analysis and microscopic investigation into the pellets taken from the blast furnace shows that the shell consists of much metallic iron, a little wustite and slag. Its melting point is 1560℃. On the other hand, the core consists of much wustite, and small amounts of metallic iron and slag. Its melting point is 1360℃. (2) When a pellet prereduced to wustite is reduced by reducing gas containing 30%CO+70%N_2 at 1200°-1250℃ during 30-60 minutes, a dense metallic iron shell of about 1.5mm in thickness is formed. (3) Strong mutual cohesion takes place among pellet particles, by heating pellets having metallic iron shell in the atmosphere of N_2 at 1250°-1300℃ during 30-60 minutes under a lord of 1.0kg/cm^2.

著者

記載無し

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.40, no.5, 1954-04-25

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試料を混酸で分解し, 過マンガン酸カリウム溶液で炭化物等を酸化し, 過剰を過酸化水素水で還元したのちクエン酸を加え, 次にアンモニア水で溶液を弱アルカリ性にする. ヨウ化カリウム, フエリシアン化カリウム標準液を滴加し, ニツケルだけを錯シアン化物にしたのち, 亜硫酸ナトリウム溶液を加えてフエシリアン化カリウムを還元し, シアン化カリウム標準液で滴定する.

著者

森 滋勝

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.76, no.6, pp.817-824, 1990-06-01 (Released:2010-05-07)

参考文献数

59

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最近の流動層“工学”の進歩を述べなければならないのだが,ここでは,最近の研究と技術開発について現在注目を集めているテーマを例として取り上げ,その成果と課題を紹介する.鞭,森,堀尾による“流動層の反応工学”が刊行されてから既に5年余りが経過した.本書の1・2節で,流動層の歴史を4期に分け,“第3期で流動化現象を覆っていた未知のベールはほぼ取り除かれ,粒子分散系の挙動の総合的解明に大きな一歩を踏み出したのが現在の第4期である.”と述べたが,その後,流動化粒子や操作条件の拡大にともない,新しいベールに包まれたより一般的な粒子分散系の解明に向けてますます盛んに研究が行われている.この間に,特集記事や成書が刊行された.流動層に関する第4~6回の国際会議も開催され,それぞれのプロシーディングが刊行されている.さらに特筆されるのは,新しく循環流動層だけについての国際会議が既に2回開催されたことで,第3回が1990年10月に名古屋で開催されることになっている.新しい研究の展開に大きな影響を与えたのは,この間もやはり流動層技術の新たな展開であった.1980年代に入って1970年代の世界を巻き込んだエネルギー問題も石油価格の低下により一応鎮静化した.しかし,流動層燃焼技術の開発は研究費の削減などの逆風にもかかわらず大きな進展を見た.特に,新しい燃焼技術として登場した循環流動層燃焼装置(CFBC)は,中規模用ボイラーとしてヨーロッパにおいて大成功を納め,その後,米国やアジアにおいても主に産業用ボイラーとして急速に導入されている.このCFBCの成功により,循環流動層(CFB)に関する研究がいっせいに展開され,国際会議が開催されるまでになったのである.一方,エネルギー問題に続いて主に我が国において起こったファインセラミックスをはじめとする新素材ブームは,流動層を使用した化学気相成長法(CVD)等の新しい反応器の開発やサブミクロン等の微細粒子の流動化に関する研究の強い推進力となっている.さらに,石油製品のいっそうの白物化に対応するため,より重質な油分が処理できる流動層接触分解プロセス(FCC)の開発や,高度な環境保全に対応できる下水汚泥の焼却,廃棄物や都市塵芥の燃焼とエネルギー利用プラントの開発等は,流動層に対してより高度で精密な設計と操作を要求し,詳細な基礎研究がますます重要になっている.また,最近では石油化学製品の好調な需要に支えられて各種の新しい触媒反応器の大型化や建設が計画されており,一部では既に稼働しはじめているが,今後の動向は世界的な経済情勢の動向に大きくかかわっている.鉄鋼分野では,既に読者の方々もよく御承知のように,溶融還元プロセスのための流動層を用いた鉄鉱石の予備還元炉の開発が推進されている.ここでは,まず流動化現象に関する最近の研究として,循環流動層と微細粒子の流動化を取り上げその現状と課題を紹介する.次に,最近の流動層技術の展開の例として,FCCプロセス,燃焼プロセス,新素材製造技術を取り上げ,最近の展開を紹介する.

著者

堀川 一男

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.77, no.6, pp.N287-N289, 1991-06-01

著者

川村 秀紀 飯島 一昭

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

杉本 公一 小林 純也 北條 智彦

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.103, no.1, pp.1-11, 2017 (Released:2016-12-31)

参考文献数

132

被引用文献数

1 24

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This paper introduces the microstructure, retained austenite characteristics, strain-induced transformation-deformation mechanism and mechanical properties of transformation-induced plasticity (TRIP)-aided martensitic (TM) steels for the automotive applications. Because the microstructure consists of a wide lath-martensite structured matrix and a mixture of narrow lath-martensite and metastable retained austenite (MA-like phase), the TM steel produced a good combination of tensile strength and cold formability. If Cr and/or Mo were added into 0.2%C-1.5%Si-1.5%Mn steel to enhance its hardenability, the resultant TM steel achieved superior notch fatigue strength and impact and fracture toughness to conventional structural steel such as SCM420. These enhanced mechanical properties were found to be mainly caused by: (1) plastic relaxation of the stress concentration, which results from expansion strain on the strain-induced transformation of the metastable retained austenite; and (2) the presence of a large quantity of finely dispersed MA-like phase, which suppresses crack or void initiation and subsequent connection.

著者

西村 啓造

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.28, no.5, pp.593-598, 1942-05-25

著者

堀川 一男

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.65, no.2, pp.A61-A84, 1979-02-01 (Released:2010-02-22)

被引用文献数

1 1

著者

白川 聖子

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.80, no.1, 1994-01-01

著者

村上 陽太郎

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.73, no.3, pp.420-426, 1987-03-01

被引用文献数

2

著者

木村 啓造

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.1, pp.113-122, 1986-01-01

被引用文献数

1

著者

田村 博

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.9, pp.1447-1459, 1981-07-01

著者

杉江 英司 松岡 雅典 秋山 俊弥 三村 宏 住友 芳夫

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.69, no.9, pp.1190-1197, 1983

被引用文献数

2

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High Strength Line Pipe Research Committee in the Iron and Steel Institute of Japan has conducted five full scale burst tests with air pressure of 12.0 MPa on pipes of 48 in. in diameter and 0.720 in. in wall thickness of API. grade X 70, made with both controlled rolled steels and quenched and tempered steels. The arrestability of the pipes for the propagating shear fracture can be evaluated by Charpy absorbed energy and is not influenced by the existence of separation. The critical Charpy energy for arresting the shear fracture depends on the distance in which the crack should be arrested, and this phenomenon is well explained by solving the equation which governs the change in the crack velocity. Under the present test condition, the critical Charpy energy is 180 J for the arrest within one pipe length and 130 J for the arrest within two pipe length.

著者

齋藤 好弘 宇都宮 裕 平田 健二 岡 景則

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.83, no.7, pp.431-436, 1997-07-01 (Released:2009-06-19)

参考文献数

3

被引用文献数

1 1

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The authors have developed a new type rolling mill named the satellite mill. The mill comprises one large diameter roll (central roll) and five smaller diameter rolls (satellite rolls) arranged along a circumference of the central roll. Material is passed continuously through the five gaps between the central roll and the satellite rolls and deformed into a profiled cross section. Since all rolls are driven at the same roll speed, longitudinal compressive stress is produced between stands during rolling. The elongation is greatly suppressed. The mill has been applied to the production of round-edged flat wires and two kinds of T-shaped profiled wires from round circular wires. The obtained rolling characteristics and product properties are compared with those by a conventional rolling method. It is shown that the transverse metal flow is enhanced and the filling ability to the roll groove is excellent in satellite-mill rolling. The effect is more apparent in rolling of T-shaped wire having thinner ribs. It is supposed that the satellite mill is favorable for profiled wire production.

著者

梅本 実 田村 今男

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.3, pp.383-392, 1982-03-01

著者

潮田 浩作 吉村 仁秀 海藤 宏志 木村 謙

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.6, pp.716-727, 2014 (Released:2014-05-31)

参考文献数

67

被引用文献数

7

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Steels have made remarkable progress in order to meet the strict requirements of today’s society. Such progress is based on scientific elucidation of the functions of alloying elements, their effective utilization, and the innovative production processes.Since natural resources are limited, it is important to increase their productivity for the continuous development of our society. Therefore, proper management taking into account the element strategy is becoming extremely important.Steel industries are highly dependent on rare metals. Therefore, they are easily influenced by the hazards of rare metals, avoidance of which is extremely crucial.This paper focuses on steels such as flat-rolled product, plate, pipe & tube and stainless steel, and historically reviews them from the aspect of changes in the surrounding market together with the technological developments such as new steel products and exploitation of rare metals for them. The functions of rare metals are classified into three types, i.e. the control of a) microstructures, b) mechanical properties and c) anti-corrosion properties, and the present understanding of them is discussed from a scientific perspective. Furthermore, the concrete future scientific and technological problems are surveyed. It is revealed that there are still many issues that need to be addressed. Exploitation of the advanced analytical techniques together with computational science is expected to contribute to solving the long standing problems and to stimulate a breakthrough in this field.

著者

日本鉄鋼協会

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.42, no.5, 1956-05-01

著者

秋山 英二 李 松杰 片山 英樹 張 波萍 趙 楷 押川 渡

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.103, no.2, pp.93-100, 2017

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<p>Electrochemical hydrogen permeation tests were carried out under controlled temperature and humidity using pure Fe sheet specimens outdoor-exposed at Beijing and Chongqing, China and Okinawa, Japan in order to understand the effect of environmental factors on hydrogen uptake behavior. The maximum hydrogen permeation current densities of the exposed specimens were in the order of Beijing > Chongqing >> Okinawa, while the order of the degree of corrosion of the specimens was Okinawa > Chongqing >> Beijing. X-ray fluorescence analysis showed that the surface concentrations of sulfur on the Beijing- and Chongqing-exposed specimens were higher than that of the Okinawa-exposed specimens, whereas chlorine concentrations of the Beijing and Okinawa-exposed specimens were higher than that of the Chongqing-exposed specimen. Nitrate concentrations of Beijing- and Chongqing-exposed specimens evaluated using nitrate test strips were obviously higher than that of the Okinawa-exposed specimens. It is suggested that air pollutants such as SO₂ and NO₂ and particulate matters containing inorganic acid ions, likely sulfate and nitrate ions, and possibly organic acids contribute to acidification of rust layer leading to the enhanced hydrogen entry.</p>